LT6375HDF#TRPBF [Linear]
LT6375 - ±270V Common Mode Voltage Difference Amplifier; Package: DFN; Pins: 14; Temperature Range: -40°C to 125°C;
| 型号： | LT6375HDF#TRPBF |
| 厂家： | 
Linear |
| 描述： | LT6375 - ±270V Common Mode Voltage Difference Amplifier; Package: DFN; Pins: 14; Temperature Range: -40°C to 125°C 放大器 光电二极管 |
| 文件： | 总32页 (文件大小：1635K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT6375
±±27V Common Mode
Voltage Difference Amplifier
FEATURES
DESCRIPTION
The LT®6375 is a unity-gain difference amplifier which
combinesexcellentDCprecision,averyhighinputcommon
mode range and a wide supply voltage range. It includes a
precision op amp and a highly-matched thin film resistor
network. It features excellent CMRR, extremely low gain
error and extremely low gain drift.
n
270V Common Mode Voltage Range
n
97dB Minimum CMRR (LT6375A)
n
0.0035% (35ppm) Maximum Gain Error (LT6375A)
n
1ppm/°C Maximum Gain Error Drift
n
2ppm Maximum Gain Nonlinearity
n
Wide Supply Voltage Range: 3.3V to 50V
n
Rail-to-Rail Output
350µA Supply Current
Comparing the LT6375 to existing difference amplifiers
with high common mode voltage range, the selectable
resistor divider ratios of the LT6375 offer superior system
performance by allowing the user to achieve maximum
SNR, precision and speed for a specific input common
mode voltage range.
The op amp at the core of the LT6375 has Over-The-Top®
protected inputs which allow for robust operation in envi-
ronments with unpredictable voltage conditions. See the
Applications Information section for more details.
n
n
Selectable Internal Resistor Divider Ratio
n
300µV Maximum Offset Voltage (LT6375A)
n
575kHz –3dB Bandwidth (Resistor Divider = 7)
n
375kHz –3dB Bandwidth (Resistor Divider = 20)
n
–40°C to 125°C Specified Temperature Range
n
Low Power Shutdown: 20μA (DFN Package Only)
n
Space-Saving MSOP and DFN Packages
APPLICATIONS
n
High Side or Low Side Current Sensing
The LT6375 is specified over the –40°C to 125°C tem-
perature range and is available in space-saving MSOP16
and DFN14 packages.
L, LT, LTC, LTM, Linear Technology, Over-The-Top and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
n
Bidirectional Wide Common Mode Range Current Sensing
n
High Voltage to Low Voltage Level Translation
n
Precision Difference Amplifier
n
Industrial Data-Acquisition Front-Ends
n
Replacement for Isolation Circuits
TYPICAL APPLICATION
Precision Wide Voltage Range, Bidirectional Current Monitor
Typical Distribution of CMRR
15V
200
180
160
140
120
100
80
1248 UNITS
FROM 4 RUNS
V
V
= ±±15
S
+
–REFA
19k
–REFB
38k
–REFC
23.75k
V
= ±±270
IN
DIV = 25
190k
+
V
= –270V TO 270V
SOURCE
190k
–IN
+IN
–
+
R
OUT
REF
SENSE
R
10Ω
C
V
= 10ꢀV/ꢀA
OUT
10Ω
190k
60
40
LOAD
20
190k
19k
+REFA
38k
23.75k
+REFC
0
–40 –30 –20 –10
0
10 20 30 40
–
+REFB
SHDN
V
CMRR (µV/V = ppm)
6375 TA01a
6375 TA01b
–15V
6375fa
1
For more information www.linear.com/LT6375
LT6375
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Output Short-Circuit Duration (Note 3) Thermally Limited
Temperature Range (Notes 4, 5)
LT6375I................................................–40°C to 85°C
LT6375H ............................................ –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
MSOP Lead Temperature (Soldering, 10 sec)........300°C
Supply Voltages
(V to V )..............................................................60V
+IN, –IN, (Note 2)
Each Input......................................................... 270V
Differential........................................................ 540V
+REFA, –REFA, +REFB, –REFB, +REFC, –REFC,
+
–
+
–
REF, SHDN (Note 2) ................ (V + 0.3V) to (V –0.3V)
Output Current (Continuous) (Note 6)....................50mA
PIN CONFIGURATION
TOP VIEW
TOP VIEW
+IN
1
14 –IN
1
3
+IN
16 –IN
+REFA
14 –REFA
12 –REFB
+REFA
+REFB
+REFC
REF
3
4
5
6
7
12 –REFA
11 –REFB
–
5
6
7
8
+REFB
+REFC
REF
15 V
11 –REFC
+
10 –REFC
+
10
9
V
–
V
OUT
9
8
V
MS PACKAGE
SHDN
OUT
VARIATION: MS16 (12)
16-LEAD PLASTIC MSOP
T
JMAX
= 150°C, θ = 130°C/W
JA
DF PACKAGE
14(12)-LEAD (4mm × 4mm) PLASTIC DFN
= 150°C, θ = 43°C/W, θ = 4°C/W
T
JMAX
JA
JC
–
EXPOSED PAD (PIN 15) IS V , MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
6375
PACKAGE DESCRIPTION
TEMPERATURE RANGE
–40°C to 85°C
LT6375IDF#PBF
LT6375IDF#TRPBF
LT6375HDF#TRPBF
LT6375AHDF#TRPBF
LT6375IMS#TRPBF
LT6375HMS#TRPBF
LT6375AHMS#TRPBF
14-Lead (4mm × 4mm) Plastic DFN
14-Lead (4mm × 4mm) Plastic DFN
14-Lead (4mm × 4mm) Plastic DFN
16-Lead Plastic MSOP
LT6375HDF#PBF
LT6375AHDF#PBF
LT6375IMS#PBF
LT6375HMS#PBF
LT6375AHMS#PBF
6375
–40°C to 125°C
–40°C to 125°C
–40°C to 85°C
6375
6375
6375
16-Lead Plastic MSOP
–40°C to 125°C
–40°C to 125°C
6375
16-Lead Plastic MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
6375fa
2
For more information www.linear.com/LT6375
LT6375
The l denotes the specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
temperature range, –40°C < TA < 85°C for I-grade parts, –40°C < TA < 125°C for H-grade parts, otherwise specifications are at TA = 25°C,
V+ = 15V, V– = –15V, VCM = VOUT = VREF = 0V. VCMOP is the common mode voltage of the internal op amp. For Resistor Divider
Ratio = 7, ±REFA = ± REFC = OPEN, ±REFB = 0V. For Resistor Divider Ratio = 20, ±REFA = ±REFC = 0V, ±REFB = OPEN. For Resistor
Divider Ratio = 25, ±REFA = ±REFB = ±REFC = 0V.
LT6375A
LT6375
TYP
1
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
MAX
UNITS
G
Gain
V
V
=
=
10V
10V
1
V/V
OUT
OUT
∆G
Gain Error
0.0007 0.0035
0.005
0.001 0.006
0.0075
%
%
l
l
∆G/∆T
GNL
Gain Drift vs Temperature
(Note 6)
V
V
=
=
10V
10V
0.2
1
0.2
1
ppm/°C
OUT
Gain Nonlinearity
1
2
3
1
2
3
ppm
ppm
OUT
l
–
+
V
OS
Output Offset Voltage
V < V
< V –1.75V
CMOP
Resistor Divider Ratio = 7
Resistor Divider Ratio = 7
Resistor Divider Ratio = 20
Resistor Divider Ratio = 20
Resistor Divider Ratio = 25
Resistor Divider Ratio = 25
100
250
300
300
750
120
300
400
450
µV
µV
µV
µV
µV
µV
l
l
l
1500
1200
4000
1500
5000
700
2000
900
2500
–
+
∆V /∆T Output Offset Voltage Drift
V < V
< V –1.75V
OS
CMOP
l
l
(Note 6)
Resistor Divider Ratio = 7
Resistor Divider Ratio = 20
3
8
9
23
4
10
12
30
µV/°C
µV/°C
R
IN
Input Impedance (Note 8)
Common Mode
l
l
l
l
Resistor Divider Ratio = 7
Resistor Divider Ratio = 20
Resistor Divider Ratio = 25
Differential
93
84
111
100
99
129
116
115
440
93
84
111
100
99
129
116
115
440
kΩ
kΩ
kΩ
kΩ
83
83
320
380
320
380
CMRR
Common Mode Rejection Ratio MS16 Package
Resistor Divider Ratio = 7, V
=
=
28V
28V
96
94
96
94
96
94
97
94
106
106
106
107
89
83
89
83
89
83
90
83
100
100
100
100
dB
dB
dB
dB
dB
dB
dB
dB
CM
CM
l
l
l
l
Resistor Divider Ratio = 7, V
Resistor Divider Ratio = 20, V
Resistor Divider Ratio = 20, V
Resistor Divider Ratio = 25, V
Resistor Divider Ratio = 25, V
Resistor Divider Ratio = 25, V
Resistor Divider Ratio = 25, V
=
=
=
=
=
=
28V
CM
28V
CM
CM
CM
CM
CM
28V
28V
270V
270V
DF14 Package
Resistor Divider Ratio = 7, V
Resistor Divider Ratio = 7, V
=
28V
28V
94
92
94
92
94
92
95
92
104
104
104
105
89
83
89
83
89
83
90
83
100
100
100
100
dB
dB
dB
dB
dB
dB
dB
dB
CM
CM
l
l
l
=
Resistor Divider Ratio = 20, V
Resistor Divider Ratio = 20, V
Resistor Divider Ratio = 25, V
Resistor Divider Ratio = 25, V
Resistor Divider Ratio = 25, V
Resistor Divider Ratio = 25, V
=
=
=
=
=
=
28V
CM
28V
CM
CM
CM
CM
CM
28V
28V
270V
270V
l
l
V
Input Voltage Range (Note 7)
Power Supply Rejection Ratio
–270
270
–270
270
V
CM
PSRR
V = 1.65V to 25V, V = V
=
OUT
S
CM
Mid-Supply
l
l
l
Resistor Divider Ratio = 7
Resistor Divider Ratio = 20
Resistor Divider Ratio = 25
101
93
91
115
104
101
98
90
88
110
100
100
dB
dB
dB
6375fa
3
For more information www.linear.com/LT6375
LT6375
The l denotes the specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
temperature range, –40°C < TA < 85°C for I-grade parts, –40°C < TA < 125°C for H-grade parts, otherwise specifications are at TA = 25°C,
V+ = 15V, V– = –15V, VCM = VOUT = VREF = 0V. VCMOP is the common mode voltage of the internal op amp. For Resistor Divider
Ratio = 7, ±REFA = ± REFC = OPEN, ±REFB = 0V. For Resistor Divider Ratio = 20, ±REFA = ±REFC = 0V, ±REFB = OPEN. For Resistor
Divider Ratio = 25, ±REFA = ±REFB = ±REFC = 0V.
LT6375A
TYP
LT6375
TYP
SYMBOL PARAMETER
CONDITIONS
MIN
MAX
MIN
MAX
UNITS
e
Output Referred Noise Voltage
Density
f = 1kHz
no
Resistor Divider Ratio = 7
250
508
599
250
508
599
nV/√Hz
nV/√Hz
nV/√Hz
Resistor Divider Ratio = 20
Resistor Divider Ratio = 25
Output Referred Noise Voltage
f = 0.1Hz to 10Hz
Resistor Divider Ratio = 7
Resistor Divider Ratio = 20
Resistor Divider Ratio = 25
10
20
25
10
20
25
µV
µV
µV
P-P
P-P
P-P
l
l
V
V
Output Voltage Swing Low
No Load
SINK
5
50
5
50
mV
mV
OL
–
(Referred to V )
I
= 5mA
280
500
280
500
l
l
Output Voltage Swing High
No Load
SOURCE
5
400
20
750
5
400
20
750
mV
mV
OH
+
(Referred to V )
I
= 5mA
+
–
l
l
I
SC
Short-Circuit Output Current
50Ω to V
50Ω to V
10
10
28
30
10
10
28
30
mA
mA
l
SR
Slew Rate
∆V
=
5V
1.6
2.4
1.6
2.4
V/µs
OUT
BW
Small Signal –3dB Bandwidth
Resistor Divider Ratio = 7
Resistor Divider Ratio = 20
Resistor Divider Ratio = 25
575
375
310
575
375
310
kHz
kHz
kHz
t
S
Settling Time
Resistor Divider Ratio = 7
0.01%, ∆V
= 10V
41
14
41
14
µs
µs
µs
OUT
OUT
0.1%, ∆V
= 10V
0.01%, ∆V = 10V, ∆V
= 0V
= 0V
= 0V
100
100
CM
DIFF
DIFF
DIFF
Resistor Divider Ratio = 20
0.01%, ∆V
= 10V
31
11
100
31
11
100
µs
µs
µs
OUT
0.1%, ∆V
= 10V
OUT
0.01%, ∆V = 10V, ∆V
CM
Resistor Divider Ratio = 25
0.01%, ∆V
= 10V
26
8
20
26
8
20
µs
µs
µs
OUT
0.1%, ∆V
= 10V
OUT
0.01%, ∆V = 10V, ∆V
CM
V
Supply Voltage
3
3.3
50
50
3
3.3
50
50
V
V
S
l
t
Turn-On Time
16
16
µs
V
ON
l
l
l
V
SHDN Input Logic Low
(Referred to V )
–2.5
–2.5
IL
+
V
SHDN Input Logic High
(Referred to V )
–1.2
–1.2
V
IH
+
I
I
SHDN Pin Current
–10
350
–15
–10
350
–15
µA
SHDN
+
+
Supply Current
Active, V
Active, V
≥ V –1.2V
400
600
25
400
600
25
µA
µA
µA
µA
S
SHDN
SHDN
Shutdown, V
Shutdown, V
l
l
≥ V –1.2V
+
+
≤ V –2.5V
≤ V –2.5V
20
20
SHDN
SHDN
70
70
6375fa
4
For more information www.linear.com/LT6375
LT6375
The l denotes the specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
temperature range, –40°C < TA < 85°C for I-grade parts, –40°C < TA < 125°C for H-grade parts, otherwise specifications are at TA = 25°C,
V+ = 5V, V– = 0V, VCM = VOUT = VREF = Mid-Supply. VCMOP is the common mode voltage of the internal op amp. For Resistor
Divider Ratio = 7, ±REFA = ±REFC = OPEN, ±REFB = Mid-Supply. For Resistor Divider Ratio = 20, ±REFA = ±REFC = Mid-Supply,
±REFB = OPEN. For Resistor Divider Ratio = 25, ±REFA = ±REFB = ±REFC = Mid-Supply.
LT6375A
LT6375
TYP
1
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
MAX
UNITS
G
Gain
V
V
= 1V to 4V
= 1V to 4V
1
V/V
OUT
OUT
∆G
Gain Error
0.0007 0.0035
0.005
0.001 0.006
0.0075
%
%
l
l
∆G/∆T
Gain Drift vs Temperature
(Note 6)
V
= 1V to 4V
0.2
1
0.2
1
ppm/°C
OUT
GNL
Gain Nonlinearity
V
= 1V to 4V
1
1
ppm
OUT
+
V
OS
Output Offset Voltage
0 < V
< V –1.75V
CMOP
Resistor Divider Ratio = 7
Resistor Divider Ratio = 7
Resistor Divider Ratio = 20
Resistor Divider Ratio = 20
Resistor Divider Ratio = 25
Resistor Divider Ratio = 25
100
250
300
300
750
120
300
400
500
µV
µV
µV
µV
µV
µV
l
l
l
1500
1200
4000
1500
5000
700
2000
900
2500
+
∆V /∆T Output Offset Voltage Drift
0 < V
< V –1.75V
OS
CMOP
l
l
(Note 6)
Resistor Divider Ratio = 7
Resistor Divider Ratio = 20
3
8
9
23
4
10
12
30
µV/°C
µV/°C
R
IN
Input Impedance (Note 8)
Common Mode
l
l
l
l
Resistor Divider Ratio = 7
Resistor Divider Ratio = 20
Resistor Divider Ratio = 25
Differential
93
84
111
100
99
129
116
115
440
93
84
111
100
99
129
116
115
440
kΩ
kΩ
kΩ
kΩ
83
83
320
380
320
380
CMRR
Common Mode Rejection
Ratio
MS16 Package
Resistor Divider Ratio = 7
V
V
= –15V to +7.75V
= –15V to +7.75V
94
92
105
105
105
85
83
95
95
95
dB
dB
CM
CM
l
l
l
Resistor Divider Ratio = 20
V
CM
V
CM
= –25.5V to +17.5V
= –25.5V to +17.5V
94
92
85
83
dB
dB
Resistor Divider Ratio = 25
V
V
= –25.5V to +21.25V
= –25.5V to +21.25V
94
92
85
83
dB
dB
CM
CM
DF14 Package
Resistor Divider Ratio = 7
V
V
= –15V to +7.75V
= –15V to +7.75V
92
90
103
103
103
85
83
95
95
95
dB
dB
CM
CM
l
l
l
Resistor Divider Ratio = 20
V
V
= –25.5V to +17.5V
= –25.5V to +17.5V
92
90
85
83
dB
dB
CM
CM
Resistor Divider Ratio = 25
V
CM
V
CM
= –25.5V to +21.25V
= –25.5V to +21.25V
92
90
85
83
dB
dB
PSRR
Power Supply Rejection Ratio V = 1.65V to 25V, V = V
= Mid-Supply
OUT
S
CM
l
l
l
Resistor Divider Ratio = 7
101
93
91
115
104
101
98
90
88
110
100
100
dB
dB
dB
Resistor Divider Ratio = 20
Resistor Divider Ratio = 25
e
no
Output Referred Noise
Voltage Density
f = 1kHz
Resistor Divider Ratio = 7
250
508
599
250
508
599
nV/√Hz
nV/√Hz
nV/√Hz
Resistor Divider Ratio = 20
Resistor Divider Ratio = 25
6375fa
5
For more information www.linear.com/LT6375
LT6375
The l denotes the specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
temperature range, –40°C < TA < 85°C for I-grade parts, –40°C < TA < 125°C for H-grade parts, otherwise specifications are at TA = 25°C,
V+ = 5V, V– = 0V, VCM = VOUT = VREF = Mid-Supply. VCMOP is the common mode voltage of the internal op amp. For Resistor
Divider Ratio = 7, ±REFA = ±REFC = OPEN, ±REFB = Mid-Supply. For Resistor Divider Ratio = 20, ±REFA = ±REFC = Mid-Supply,
±REFB = OPEN. For Resistor Divider Ratio = 25, ±REFA = ±REFB = ±REFC = Mid-Supply.
LT6375A
TYP
LT6375
TYP
SYMBOL PARAMETER
CONDITIONS
MIN
MAX
MIN
MAX
UNITS
Output Referred Noise
Voltage
f = 0.1Hz to 10Hz
Resistor Divider Ratio = 7
Resistor Divider Ratio = 20
Resistor Divider Ratio = 25
10
20
25
10
20
25
µV
µV
µV
P-P
P-P
P-P
l
l
V
V
Output Voltage Swing Low
No Load
SINK
5
50
5
50
mV
mV
OL
–
(Referred to V )
I
= 5mA
280
500
280
500
l
l
Output Voltage Swing High
No Load
SOURCE
5
400
20
750
5
400
20
750
mV
mV
OH
+
(Referred to V )
I
= 5mA
+
–
l
l
I
SC
Short-Circuit Output Current 50Ω to V
50Ω to V
10
10
27
25
10
10
27
25
mA
mA
l
SR
Slew Rate
∆V
= 3V
1.3
2
1.3
2
V/µs
OUT
BW
Small Signal –3dB Bandwidth Resistor Divider Ratio = 7
Resistor Divider Ratio = 20
565
380
325
565
380
325
kHz
kHz
kHz
Resistor Divider Ratio = 25
t
S
Settling Time
Resistor Divider Ratio = 7
0.01%, ∆V = 2V
18
10
64
18
10
64
µs
µs
µs
OUT
= 2V
0.1%, ∆V
OUT
0.01%, ∆V = 2V, ∆V
= 0V
= 0V
= 0V
CM
DIFF
Resistor Divider Ratio = 20
0.01%, ∆V = 2V
24
7
48
24
7
48
µs
µs
µs
OUT
OUT
0.1%, ∆V
= 2V
0.01%, ∆V = 2V, ∆V
CM
DIFF
Resistor Divider Ratio = 25
0.01%, ∆V = 2V
27
9
20
27
9
20
µs
µs
µs
OUT
OUT
0.1%, ∆V
= 2V
0.01%, ∆V = 2V, ∆V
CM
DIFF
V
S
Supply Voltage
3
3.3
50
50
3
3.3
50
50
V
V
l
t
Turn-On Time
22
22
µs
V
ON
l
l
l
V
SHDN Input Logic Low
(Referred to V )
–2.5
–2.5
IL
+
V
SHDN Input Logic High
(Referred to V )
–1.2
–1.2
V
IH
+
I
I
SHDN Pin Current
–10
330
–15
–10
330
–15
µA
SHDN
+
+
Supply Current
Active, V
Active, V
≥ V –1.2V
370
525
20
370
525
20
µA
µA
µA
µA
S
SHDN
SHDN
Shutdown, V
Shutdown, V
l
l
≥ V –1.2V
+
+
≤ V –2.5V
≤ V –2.5V
15
15
SHDN
SHDN
40
40
6375fa
6
For more information www.linear.com/LT6375
LT6375
ELECTRICAL CHARACTERISTICS
Nꢁol ±: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Nꢁol 5: The LT6375I is guaranteed to meet specified performance from
–40°C to 85°C. The LT6375H is guaranteed to meet specified performance
from –40°C to 125°C.
Nꢁol 6: This parameter is not 100% tested.
Nꢁol 2: See Common Mode Voltage Range in the Applications Information
section of this data sheet for other considerations when taking +IN/–IN
pins to 270V. All other pins should not be taken more than 0.3V beyond
the supply rails.
Nꢁol 3: A heat sink may be required to keep the junction temperature
below absolute maximum. This depends on the power supply, input
voltages and the output current.
Nꢁol 7: Input voltage range is guaranteed by the CMRR test at V = 15V
S
and all REF pins at ground (Resistor Divider Ratio = 25). For the other
voltages, this parameter is guaranteed by design and through correlation
with the 15V test. See Common Mode Voltage Range in the Applications
Information section to determine the valid input voltage range under
various operating conditions.
Nꢁol 8: Input impedance is tested by a combination of direct measurement
Nꢁol 4: The LT6375I is guaranteed functional over the operating
temperature range of –40°C to 85°C. The LT6375H is guaranteed
functional over the operating temperature range of –40°C to 125°C.
and correlation to the CMRR and gain error tests.
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, VS = ±15V, unless otherwise noted.
Typican Dieoꢂibꢀoiꢁu ꢁf CMRR
Typican Dieoꢂibꢀoiꢁu ꢁf CMRR
Typican Dieoꢂibꢀoiꢁu ꢁf CMRR
200
180
160
140
120
100
80
100
90
80
70
60
50
40
30
20
10
0
100
1248 UNITS
FROM 4 RUNS
BOTH PACKAGES
V
V
= ±±15
655 UNITS
FROM 2 RUNS
MS16(12)
593 UNITS
FROM 2 RUNS
DF14(12)
V
V
= ±±15
V
V
= ±±15
S
S
S
90
80
70
60
50
40
30
20
10
0
= ±±270
= ±±270
= ±±270
IN
IN
IN
DIV = 25
DIV = 25
DIV = 25
60
40
20
0
–40 –30 –20 –10
0
10 20 30 40
–40 –30 –20 –10
0
10 20 30 40
–40 –30 –20 –10
0
10 20 30 40
CMRR (µV/V = ppm)
CMRR (µV/V = ppm)
CMRR (µV/V = ppm)
6375 G01
6375 G02
6375 G03
Typican Dieoꢂibꢀoiꢁu ꢁf Gaiu Eꢂꢂꢁꢂ
Typican Dieoꢂibꢀoiꢁu ꢁf Gaiu Eꢂꢂꢁꢂ
Typican Dieoꢂibꢀoiꢁu ꢁf Gaiu Eꢂꢂꢁꢂ
400
350
300
250
200
150
100
50
200
175
150
125
100
75
200
175
150
125
100
75
593 UNITS
FROM 2 RUNS
DF14(12)
V
V
= ±±1V
S
OUT
1248 UNITS
FROM 4 RUNS
BOTH PACKAGES
V
V
= ±±1V
S
OUT
655 UNITS
FROM 2 RUNS
MS16(12)
V
V
= ±±1V
S
OUT
= ±±ꢀV
= ±±ꢀV
= ±±ꢀV
50
50
25
25
0
0
0
–50 –40 –30 –20 –10
0
10 20 30 40 50
–50 –40 –30 –20 –10
0
10 20 30 40 50
–50 –40 –30 –20 –10
0
10 20 30 40 50
GAIN ERROR (ppm)
GAIN ERROR (ppm)
GAIN ERROR (ppm)
6375 G04
6375 G05
6375 G06
6375fa
7
For more information www.linear.com/LT6375
LT6375
TA = 25°C, VS = ±15V, unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS
Typical Distribution of Gain
Common Mode Voltage Range vs
Nonlinearity
CMRR vs Frequency
Power Supply Voltage
120
100
80
60
40
20
0
300
250
200
150
100
50
300
1332 UNITS
V
V
= ±±1V
S
OUT
DIV = 7
MS16(12)
250
200
150
100
50
FROM 4 RUNS
= ±±ꢀV
BOTH PACKAGES
DIV = 7
DIV = 10
DIV = 12
DIV = 15
DIV = 17
DIV = 20
DIV = 25
OTT
0
–50
–100
–150
–200
–250
–300
0
10
100
1k
10k 100k
1M
10M
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
0
5
10
15
20
25
30
FREQUENCY (Hz)
GAIN NONLINEARITY (ppm)
POWER SUPPLY VOLTAGE ( Vꢀ
6375 G08
6375 G07
LT6375 G09
Typican Gaiu Eꢂꢂꢁꢂ fꢁꢂ RL = ±0kΩ
(Cꢀꢂvl e Offel o fꢁꢂ Cnaꢂioy)
Typican Gaiu Eꢂꢂꢁꢂ fꢁꢂ RL = 5kΩ
(Cꢀꢂvl e Offel o fꢁꢂ Cnaꢂioy)
Typican Gaiu Eꢂꢂꢁꢂ fꢁꢂ RL = 2kΩ
(Cꢀꢂvl e Offel o fꢁꢂ Cnaꢂioy)
V
S
= ±±1V
V
= ±±1V
V
= ±±1V
S
S
V
= ±±1V
S
V
= ±±1V
V
= ±±1V
S
S
V
S
= ±±1V
V
= ±±1V
V
= ±±1V
S
S
V
= ±±1V
S
V
= ±±1V
V
= ±±1V
S
S
–20 –16 –12 –8 –4
0
4
8
12 16 20
–20 –16 –12 –8 –4
0
4
8
12 16 20
–20 –16 –12 –8 –4
0
4
8
12 16 20
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
6375 G10
6375 G12
6375 G11
Typican Gaiu Eꢂꢂꢁꢂ fꢁꢂ Lꢁw Sꢀppny
Vꢁnoagl e (Cꢀꢂvl e Offel o fꢁꢂ Cnaꢂioy)
Gaiu Nꢁuniul aꢂioy
Gaiu Nꢁuniul aꢂioy
100
80
100
80
V
= ±±1V
= ±0kΩ
V
= ±±1V
= 2kΩ
S
S
R
R
L
L
60
60
V
= ±±V, R = 10kΩ
L
S
40
40
V
= ±±V, R = 2kΩ
20
20
S
L
0
0
–20
–40
–60
–80
–100
–20
–40
–60
–80
–100
V
= ±±V, R = 1kΩ
L
S
V
= ±±2.V, R = 1kΩ
L
S
–15
–10
–5
0
5
10
15
–5 –4 –3 –2 –1
0
1
2
3
4
5
–15
–10
–5
0
5
10
15
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
6375 G15
6375 G13
6375 G14
6375fa
8
For more information www.linear.com/LT6375
LT6375
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, VS = ±15V, unless otherwise noted.
Gaiu Nꢁuniul aꢂioy
Gaiu Nꢁuniul aꢂioy
Gaiu Eꢂꢂꢁꢂ ve Tl mpl ꢂaoꢀꢂl
100
80
10
8
100
80
10
8
V
= ±±1V
= ±00kΩ
V
= ±±1V
= ±MΩ
V
V
R
= ±±15
S
S
S
R
R
= ±±10
L
L
OUT
= 10kΩ
L
60
60
6
6
10 UNITS
40
40
4
4
20
20
2
2
0
0
0
0
–20
–40
–60
–80
–100
–20
–40
–60
–80
–100
–2
–4
–6
–8
–10
–2
–4
–6
–8
–10
–15
–10
–5
0
5
10
15
–75 –50 –25
0
25 50 75 100 125 150 175
–15
–10
–5
0
5
10
15
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
6375 G16
6375 G18
Maximꢀm Pꢁwl ꢂ Dieeipaoiꢁu
ve Tl mpl ꢂaoꢀꢂl
Oꢀopꢀo Vꢁnoagl ve Lꢁad Cꢀꢂꢂl uo
Gaiu ve Fꢂl qꢀl ucy
5
20
10
20
15
DF14(12) θ = 43°C/W
JA
4
3
2
1
0
0
10
–10
–20
–30
–40
–50
–60
–70
–80
5
130°C
85°C
25°C
–45°C
0
DIV = 7
–5
DIV = 10
DIV = 12
DIV = 15
DIV = 17
DIV = 20
DIV = 25
–10
–15
–20
MS16(12) θ = 130°C/W
JA
–60 –40 –20
0
20 40 60 80 100 120 140 160
0.001
0.01
0.1
1
10
0
5
10
15
20
25
30
AMBIENT TEMPERATURE (°C)
FREQUENCY (MHz)
OUTPUT CURRENT (mA)
LT6375 G20
6375 G21
6375 G19
Fꢂl qꢀl ucy Rl epꢁuel ve
Capacioivl Lꢁad
Nꢁiel Dl ueioy ve Fꢂl qꢀl ucy
0.±Hz oꢁ ±0Hz Nꢁiel
50
40
20
10
1100
1000
900
800
700
600
500
400
300
200
DIV = 20
30
0
20
–10
–20
–30
–40
–50
–60
–70
–80
DIV = 7
10
0
0nF
0.5nF
1nF
1.5nF
2nF
3nF
5nF
–10
–20
–30
–40
–50
DIV = 20
DIV = 20
DIV = 7
0.001
0.01
0.1
1
10
1
10
100
1k
10k
100k
TIME (10s/DIV)
FREQUENCY (MHz)
FREQUENCY (Hz)
6375 G24
6375 G22
6375 G23
6375fa
9
For more information www.linear.com/LT6375
LT6375
TA = 25°C, VS = ±15V, unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS
Positive PSRR vs Frequency
Negative PSRR vs Frequency
Slew Rate vs Temperature
120
110
100
90
80
70
60
50
40
30
20
10
0
120
110
100
90
80
70
60
50
40
30
20
10
0
7
V
V
V
V
V
V
= ±±2.5, Rising
= ±±15, Rising
= ±±25, Rising
= ±±2.5, Falling
= ±±15, Falling
= ±±25, Falling
S
S
S
S
S
S
6
5
4
3
2
1
0
DIV = 20
DIV = 7
DIV = 25
DIV = 7
DIV = 20
R
= 10kΩ
L
DIV = 25
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
10k
100k
–75 –50 –25
0
25 50 75 100 125 150 175
FREQUENCY (Hz)
TEMPERATURE (°C)
6375 G25
6375 G26
6375 G27
Small-Signal Step Response
vs Capacitive Load
Small-Signal Step Response
Large-Signal Step Response
140
120
100
80
DIV = 7
DIV = 7
DIV = 7
C
R
= 560pF
= 2kΩ
R
L
= 2kΩ
C
R
= 560pF
= 2kΩ
L
L
L
L
60
560pF
40
0V
20
0V
0
1000pF
–20
–40
–60
–80
–100
20pF
0
5
10 15 20 25 30 35 40
TIME (4µs/DIV)
TIME (4µs/DIV)
TIME (µs)
6375 G29
6375 G28
6375 G30
Small-Signal Step Response
vs Capacitive Load
Large-Signal Step Response
Small-Signal Step Response
140
120
100
80
DIV = 20
DIV = 20
DIV = 20
R = 2kΩ
L
C
R
= 560pF
= 2kΩ
C
R
= 560pF
= 2kΩ
L
L
L
L
60
560pF
40
0V
20
1000pF
0V
0
–20
–40
–60
–80
–100
20pF
0
5
10 15 20 25 30 35 40
TIME (4µs/DIV)
TIME (4µs/DIV)
TIME (µs)
6375 G31
6375 G32
6375 G33
6375fa
10
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LT6375
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, VS = ±15V, unless otherwise noted.
Oꢀopꢀo Offel o Vꢁnoagl
ve Tl mpl ꢂaoꢀꢂl
Sl ooniug Timl
Sl ooniug Timl
1.0
0.5
4
16
14
12
10
8
3000
2250
1500
750
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
DIV = 7
DIV = 7
DIV = 20
10 UNITS
2
0
0
ERROR VOLTAGE
OUTPUT VOLTAGE
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–2
–4
–6
–8
–10
–12
–14
–16
6
0
ERROR VOLTAGE
4
–750
–1500
–2250
–3000
OUTPUT VOLTAGE
2
0
–0.5
–1.0
–2
–4
–60 –40 –20
0
20 40 60 80 100 120 140
TIME (10µs/DIV)
TEMPERATURE (°C)
TIME (10µs/DIV)
6375 G35
6375 G36
6375 G34
Qꢀil ecl uo Cꢀꢂꢂl uo ve Sꢀppny
Vꢁnoagl
Tt l ꢂman St ꢀodꢁwu Hyeol ꢂl eie
Qꢀil ecl uo Cꢀꢂꢂl uo ve Tl mpl ꢂaoꢀꢂl
600
600
500
400
300
200
100
0
550
10 UNITS
T
= 150°C
A
500
450
400
350
300
250
200
500
400
300
200
100
0
T
= –55°C
A
PARAMETRIC SWEEP IN ~25°C
INCREMENTS
145
150
155
160
165
170
0
10
20
30
40
50
–75 –50 –25
0
25 50 75 100 125 150 175
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
6375 G38
6375 G39
6375 G37
St ꢀodꢁwu Qꢀil ecl uo Cꢀꢂꢂl uo ve
Sꢀppny Vꢁnoagl
Qꢀil ecl uo Cꢀꢂꢂl uo ve SHDN
Vꢁnoagl
Miuimꢀm Sꢀppny Vꢁnoagl
50
40
30
20
10
0
550
500
450
400
350
300
250
200
150
100
50
150
100
50
150°C
125°C
85°C
25°C
–40°C
–55°C
V
= 0V
150°C
125°C
85°C
25°C
–40°C
–55°C
SHDN
DIV = 7
V
= ±±1V
S
T
= 125°C
A
0
–50
–100
–150
T
= 25°C
A
T
= –45°C
A
0
0
10
20
30
40
50
0
5
10
15
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
SHDN VOLTAGE (V)
TOTAL SUPPLY VOLTAGE (V)
LT6375 G40
6375 G41
6375 G42
6375fa
11
For more information www.linear.com/LT6375
LT6375
TA = 25°C, VS = ±15V, unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS
Typical Distribution of Output
Offset Voltage
Typical Distribution of Output
Offset Voltage
Typical Distribution of Output
Offset Voltage
200
175
150
125
100
75
200
175
150
125
100
75
200
DIV = 25
DIV = 20
DIV = 7
1332 UNITS
1332 UNITS
1332 UNITS
FROM 4 RUNS
BOTH PACKAGES
FROM 4 RUNS
BOTH PACKAGES
FROM 4 RUNS
BOTH PACKAGES
175
150
125
100
75
50
50
50
25
25
25
0
0
0
–400 –300 –200 –100
0
100 200 300 400
–1200 –800 –400
0
400
800 1200
–1500 –1000 –500
0
500 1000 1500
OFFSET VOLTAGE (µV)
OFFSET VOLTAGE (µV)
OFFSET VOLTAGE (µV)
6375 G43
6375 G44
6375 G45
Typican Dieoꢂibꢀoiꢁu ꢁf PSRR
Typican Dieoꢂibꢀoiꢁu ꢁf PSRR
Typican Dieoꢂibꢀoiꢁu ꢁf PSRR
200
175
150
125
100
75
200
175
150
125
100
75
200
175
150
125
100
75
1352 UNITS
FROM 4 RUNS
V
= ±±1.6V ꢀT ±ꢁ6V
V = ±±1.6V ꢀT ±ꢁ6V
S
V
= ±±1.6V ꢀT ±ꢁ6V
1352 UNITS
FROM 4 RUNS
BOTH PACKAGES
1352 UNITS
S
S
DIV = 7
DIV = ꢁ6
DIV = ꢁ0
FROM 4 RUNS
BOTH PACKAGES
BOTH PACKAGES
50
50
50
25
25
25
0
0
0
–10 –8 –6 –4 –2
0
2
4
6
8
10
–25 –20 –15 –10 –5
0
5
10 15 20 25
–30
–20
–10
0
10
20
30
PSRR (µV/V)
PSRR (µV/V)
PSRR (µV/V)
6375 G46
6375 G47
6375 G48
6375fa
12
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LT6375
PIN FUNCTIONS (DFN/MSOP)
V (Pin 9/Pin 10): Positive Supply Pin.
+
–REFA (Pin 12/Pin 14): Reference Pin A. Sets the input
common mode range and the output noise and offset.
–
V (Exposed Pad Pin 15/Pin 8): Negative Supply Pin.
–REFB (Pin 11/Pin 12): Reference Pin B. Sets the input
OUT (Pin 8/Pin 9): Output Pin.
common mode range and the output noise and offset.
+IN (Pin 1/Pin 1): Noninverting Input Pin. Accepts input
voltages from 270V to –270V.
–REFC (Pin 10/Pin 11): Reference Pin C. Sets the input
common mode range and the output noise and offset.
+REFA (Pin 3/Pin 3): Reference Pin A. Sets the input
common mode range and the output noise and offset.
REF (Pin 6/Pin 7): Reference Input. Sets the output level
when the difference between the inputs is zero.
+REFB (Pin 4/Pin 5): Reference Pin B. Sets the input
common mode range and the output noise and offset.
SHDN (Pin 7) DFN Only: Shutdown Pin. Amplifier is ac-
+
tive when this pin is tied to V or left floating. Pulling the
+
+REFC (Pin 5/Pin 6): Reference Pin C. Sets the input
common mode range and the output noise and offset.
pin >2.5V below V causes the amplifier to enter a low
power state.
–IN (Pin 14/Pin 16): Inverting Input Pin. Accepts input
voltages from 270V to –270V.
6375fa
13
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LT6375
BLOCK DIAGRAM
+
–REFA
19k
–REFB
–REFC
23.75k
V
38k
190k
190k
190k
–IN
+IN
–
+
OUT
REF
190k
+
V
19k
38k
+REFB
23.75k
+REFC
10µA
–
V
+REFA
SHDN
6375 BD
APPLICATIONS INFORMATION
TRANSFER FUNCTION
is recommended that the user choose the lowest resistor
divider ratio that achieves the required input common
mode voltage range in their application to maximize the
system SNR, precision and speed.
The LT6375 is a unity-gain difference amplifier with the
transfer function:
V
OUT
= (V – V ) + V
+IN –IN REF
Table 1 shows the noise, offset/drift, and –3dB bandwidth
oftheLT6375foralldifferentreferencepinsconfigurations.
The voltage on the REF pin sets the output voltage when
the differential input voltage (V = V – V ) is zero.
This reference is used to shift the output voltage to the COMMON MODE VOLTAGE RANGE
desired input level of the next stage of the signal chain.
DIFF
+IN
–IN
The wide common mode voltage range of the LT6375 is
enabled by both a resistor divider at the input of the op
amp and by an internal op amp that can withstand high
input voltages.
BENEFITS OF SELECTABLE RESISTOR DIVIDER RATIOS
The LT6375 offers smaller package size, better gain ac-
curacy and better noise performance than existing high
common mode voltage range difference amplifiers. Ad-
ditionally, the LT6375 allows the user to maximize system
performance by selecting the resistor divider ratio (DIV)
appropriate to their input common mode voltage range. A
higher resistor divider ratio (DIV) enables higher common
mode voltage range at the input pins, but also increases
output noise, output offset/drift and decreases the –3dB
bandwidth. Therefore, a trade-off exists between input
range and DC, AC, and drift performance of the part. It
The internal resistor network of the LT6375 divides down
the input common mode voltage. The resulting voltage
at the op amp inputs determines the op amp’s operating
region. In the configuration shown in Figure 1, a resistor
divider is created at both op amp inputs by the 190k input
resistor and the resistance from each input to ground,
which is ~31.66k. The resistance to ground is formed by
the 38k (REFB resistors) in parallel with the 190k (feed-
back/REF resistor). The result is a divide by 7 of the input
voltage. As shown in Tables 1 to 5, different connections
to reference pins (i.e. pins +REFA, –REFA, +REFB, –REFB,
6375fa
14
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LT6375
APPLICATIONS INFORMATION
Table 1. LT6375 Performance at Different Resistor Divider Ratios
RESISTOR DIVIDER OPTIONS
RESISTOR
OUTPUT
NOISE AT
–3dB
+REFA AND +REFB AND +REFC AND
DIVIDER DIFFERENTIAL
MAXIMUM OFFSET MAXIMUM OFFSET BANDWIDTH
–REFA
–REFB
–REFC
23.75k
OPEN
GND
REF RATIO (DIV)
GAIN
1kHz (nV/√Hz)
(µV)
DRIFT (µV/°C)
(kHz)
19k
38k
190k
REF
REF
REF
REF
REF
REF
REF
LT6375A LT6375 LT6375A LT6375
OPEN
OPEN
GND
OPEN
GND
GND
GND
GND
7
1
1
1
1
1
1
1
250
307
346
410
445
508
599
300
380
450
540
600
700
900
450
600
9
12
16
19
22
25
30
37
575
530
485
445
405
375
310
OPEN
OPEN
GND
10
12
15
17
20
25
12
14
16
19
23
28
OPEN
GND
720
900
GND
OPEN
GND
1000
1200
1500
OPEN
GND
GND
+REFC, –REFC) result in different resistor divider ratios
(DIV) and different attenuation of the LT6375’s input
common mode voltage.
Table 2 lists the valid input common mode voltage range
for an LT6375 with different configurations of the refer-
ence pins when used with dual power supplies. Using
the voltage ranges in this table ensures that the internal
op amp is operating in its normal (and best) region. The
figure entitled Common Mode Voltage Range vs Power
SupplyVoltage,intheTypicalPerformanceCharacteristics
section of this data sheet, illustrates the information in
Table 2 graphically.
The internal op amp of LT6375 has two operating regions:
a) If the common mode voltage at the inputs of the internal
–
+
op amp (V
) is between V and V –1.75V, the op amp
CMOP
+
operates in its normal region; b) If V
is between V
CMOP
–
–1.75V and V +76V, the op amp continues to operate,
butinitsOver-The-Top regionwithdegradedperformance
(see Over-The-Top operation section of this data sheet for
more detail).
Table 3 lists the valid input common mode voltage range
for an LT6375 that results in the internal op amp operating
in its Over-The-Top region.
+
V
S
The reference pins can be connected to ground (as in
Tables 2 and 3) or to any reference voltage. In order to
achieve the specified gain accuracy and CMRR perfor-
mance of the LT6375, this reference must have a very low
impedance. The valid input common mode range changes
depending on the voltages chosen for reference pins. One
positiveandonenegativereferenceshouldalwaysbecon-
nected to a low impedance voltage to ensure the stability
oftheamplifier. Table4liststhevalidinputcommonmode
voltage range for an LT6375 when the part is used with
a single power supply, and REF and the other reference
pins are connected to mid-supply. If, as shown in Table 5,
the REF pin remains connected to mid-supply, while the
other reference pins are connected to ground, the result
is a higher positive input range at the expense of a more
restricted negative input range.
+
–REFA
19k
–REFB
38k
–REFC
23.75k
V
190k
190k
–IN
+IN
V
V
–
+
–IN
+IN
OUT
REF
V
OUT
190k
190k
19k
+REFA
38k
23.75k
+REFC
–
+REFB
SHDN
V
6375 F01
+
–
V
S
V
S
Figure 1. Basic Connections for Dual-Supply Operation
(Resistor Divider Ratio = 7)
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APPLICATIONS INFORMATION
Table 2. Common Mode Voltage Operating Range with Dual
Power Supplies (Normal Region)
Table 5. Common Mode Voltage Operating Range with a Single
Power Supply, References to GND (Normal Region)
INPUT RANGE (REF = GND)
INPUT RANGE (REF = V /2)
S
+REFA +REFB +REFC
+REFA +REFB +REFC
AND AND AND
V = ±2.5V
S
V = ±15V
S
V = ±25V
S
V = 5V
V = 30V
V = 50V
S
S
S
AND AND AND
–REFA –REFB –REFC DIV HIGH LOW HIGH LOW HIGH LOW
–REFA –REFB –REFC DIV HIGH LOW HIGH LOW HIGH LOW
OPEN GND OPEN 5.25 –17.5 92.75 –105 162.75 –175
7
OPEN GND OPEN
7
20.25 –2.5 182.75 –15 270 –25
30 –2.5 267.5 –15 270 –25
OPEN OPEN GND 10
GND OPEN OPEN 12
7.5
9
–25 132.5 –150 232.5 –250
–30 159 –180 270 –270
OPEN OPEN GND 10
GND OPEN OPEN 12 36.5 –2.5
OPEN GND GND 15 46.25 –2.5
GND GND OPEN 17 52.75 –2.5
GND OPEN GND 20 62.5 –2.5
GND GND GND 25 78.75 –2.5
270 –15 270 –25
270 –15 270 –25
270 –15 270 –25
270 –15 270 –25
270 –15 270 –25
OPEN GND GND 15 11.25 –37.5 198.75 –225 270 –270
GND GND OPEN 17 12.75 –42.5 225.25 –255 270 –270
GND OPEN GND 20
15
–50
265 –270 270 –270
GND GND GND 25 18.75 –62.5 270 –270 270 –270
Table 3. Common Mode Voltage Operating Range with Dual
Power Supplies (Over-The-Top Region)
INPUT RANGE (REF = GND)
TheLT6375willnotoperatecorrectlyifthecommonmode
voltage at its input pins goes below the range specified in
abovetables,butthepartwillnotbedamagedaslongasthe
lowest common mode voltage at the inputs of the internal
+REFA +REFB +REFC
V = ±2.5V
S
V = ±15V
S
V = ±25V
S
AND AND AND
–REFA –REFB –REFC DIV HIGH LOW HIGH LOW HIGH LOW
–
–
op amp (V
) remains between V –25V and V . Also,
CMOP
OPEN GND OPEN 270 –17.5 270 –105 270 –175
7
the voltage at LT6375 input pins should never be higher
than 270V or lower than –270V under any circumstances.
OPEN OPEN GND 10 270
GND OPEN OPEN 12 270
–25
–30
270 –150 270 –250
270 –180 270 –270
OPEN GND GND 15 270 –37.5 270 –225 270 –270
GND GND OPEN 17 270 –42.5 270 –255 270 –270
SHUTDOWN
GND OPEN GND 20 270
–50
270 –270 270 –270
The LT6375 in the DFN14 package has a shutdown pin
(SHDN). Under normal operation this pin should be tied
GND GND GND 25 270 –62.5 270 –270 270 –270
+
+
to V or allowed to float. Tying this pin to 2.5V below V
Table 4. Common Mode Voltage Operating Range with a Single
Power Supply, References to Mid-Supply (Normal Region)
will cause the part to enter a low power state. The sup-
ply current is reduced to less than 25µA and the op amp
output becomes high impedance.
INPUT RANGE (REF = V /2)
S
+REFA +REFB +REFC
AND AND AND
V = 5V
V = 30V
V = 50V
S
S
S
–REFA –REFB –REFC DIV HIGH LOW HIGH LOW HIGH LOW
SUPPLY VOLTAGE
OPEN V /2 OPEN
7
7.75
10
–15 107.75 –90 187.75 –150
–22.5 147.5 –135 257.5 –225
S
The positive supply pin of the LT6375 should be bypassed
withasmallcapacitor(typically0.1µF)asclosetothesupply
pin as possible. When driving heavy loads an additional
4.7µF electrolytic capacitor should be added. When using
OPEN OPEN V /2 10
S
V /2 OPEN OPEN 12 11.5 –27.5 174 –165 270 –270
S
OPEN V /2 V /2 15 13.75 –35 213.75 –210 270 –270
S
S
V /2 V /2 OPEN 17 15.25 –40 240.25 –240 270 –270
S
S
–
split supplies, the same is true for the V supply pin.
V /2 OPEN V /2 20 17.5 –47.5 270 –270 270 –270
S
S
V /2 V /2 V /2 25 21.25 –60
270 –270 270 –270
S
S
S
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APPLICATIONS INFORMATION
ACCURATE CURRENT MEASUREMENTS
Increasing R
and R slightly to R
' removes
SENSE
the gain error.
C
SENSE
The LT6375 can be used in high side, low side and bi-
directional wide common mode range current sensing.
Figure 2 shows the LT6375 sensing current by measuring
R ' = R
SENSE
• 190k/(190k – R
).
SENSE
SENSE
thevoltageacrossR
.Theaddedsenseresistorscreate
SENSE
NOISE AND FILTERING
a CMRR error and a gain error. For R
greater than
SENSE
The noise performance of the LT6375 can be optimized
both by appropriate choice of its internal attenuation set-
ting and by the addition of a filter to the amplifier output
(Figure 3). For applications that do not require the full
bandwidth of the LT6375, the addition of an output filter
will lower system noise. Table 6 shows the output noise
for different internal resistor divider ratios and output
filter bandwidths.
2Ω the source resistance mismatch degrades the CMRR.
Adding a resistor equal in value to R in series with
SENSE
the +IN terminal (R ) eliminates this mismatch.
C
Using an R
greater than 10Ω will cause the gain
SENSE
error to exceed the 0.006% specification of LT6375. This
is due to the loading effects of the LT6375.
V
= I
• R
• 190k/(190k + R
)
OUT
LOAD
SENSE
SENSE
+
V
= 15V
S
+
–REFA
19k
–REFB
38k
–REFC
23.75k
V
190k
+
V
= 270V
SOURCE
190k
190k
–IN
–
+
OUT
REF
V
V
≅ R
• I
R
OUT
SENSE LOAD
SENSE
R
C
+IN
I
LOAD
REF
190k
19k
38k
23.75k
+REFC
–
+REFA
+REFB
SHDN
V
+
–
S
V
V
= –15V
= 15V
S
LOAD
+
V
S
+
–REFA
19k
–REFB
38k
–REFC
23.75k
V
190k
I
LOAD
190k
–IN
+IN
–
+
OUT
REF
R
V
V
≅ R
• I
SENSE
OUT
SENSE LOAD
R
190k
C
–
REF
V
= –270V
SOURCE
190k
19k
+REFA
38k
23.75k
+REFC
–
+REFB
SHDN
V
6375 F02
+
–
= –15V
V
V
S
S
Figure 2. Wide Voltage Range Current Sensing
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APPLICATIONS INFORMATION
+
V
S
+
–REFA
19k
–REFB
38k
–REFC
23.75k
V
190k
C2
R2
–
+
190k
–IN
+IN
LT6015
V
V
V
OUT
–
+
–IN
+IN
R1
OUT
REF
190k
C1
V
REF
190k
19k
+REFA
38k
23.75k
+REFC
–
+REFB
SHDN
V
6375 F03
+
–
V
S
V
S
Figure 3. Output Filtering with 2-Pole Butterworth Filter
Table 6. Output Noise (VP-P) for 2-Pole Butterworth Filter for
Different Internal Resistor Divider Ratios
Table 7. Component Values for Different 2-Pole Butterworth
Filter Bandwidths
Corner
Frequency
7
10
12
15
17
20
25
Corner Frequency
100kHz
R1
R2
C1
C2
11kΩ 11.3kΩ 100pF 200pF
No Filter
100kHz
10kHz
1kHz
1705µV 1831µV 1901µV 2008µV 2073µV 2177µV 2330µV
537µV 662µV 740µV 853µV 925µV 1030µV 1197µV
169µV 210µV 236µV 274µV 298µV 334µV 393µV
10kHz
11kΩ 11.3kΩ
1nF
2nF
20nF
0.2µF
1kHz
11kΩ 11.3kΩ 10nF
11kΩ 11.3kΩ 0.1µF
100Hz
54µV
18µV
67µV
22µV
75µV
25µV
87µV
29µV
95µV 107µV 126µV
100Hz
32µV 36µV
43µV
15V
V
+
–REFA
19k
–REFB
38k
–REFC
23.75k
190k
+
V
= 195V
SOURCE
190k
–IN
–
+
R
OUT
REF
SENSE
V
OUT
10Ω
R , 10Ω
C
190k
+IN
1A
190k
19k
+REFA
38k
23.75k
–
LOAD
+REFB
+REFC
SHDN
V
6375 F04
–15V
Figure 4. Current Measurement Application
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APPLICATIONS INFORMATION
ERROR BUDGET ANALYSIS
degraded. The op amp’s input bias currents change from
under 2nAto14µA.Theopamp’sinputoffsetcurrentrises
to 50nA which adds 9.5mV to the output offset voltage.
Figure 4 shows the LT6375 in a current measurement
application. The error budget for this application is shown
in Table 8. The resistor divider ratio is set to 15 to divide
the 195V input common mode voltage down to 13V at the
op amp inputs. The 1A current and 10Ω sense resistor
produceanoutputfull-scalevoltageof10V. Table8shows
theerrorsourcesinpartspermillion(ppm)ofthefull-scale
voltage across the temperature range of 25°C to 85°C.
In addition, when operating in the Over-The-Top region,
the differential input impedance decreases from 1MΩ in
normaloperationtoapproximately3.7kΩinOver-The-Top
operation. This resistance appears across the summing
nodes of the internal op amp and boosts noise and offset
while decreasing speed. Noise and offset will increase by
between 66% and 83% depending on the resistor divider
ratio setting. The bandwidth will be reduced by 40% to
45%. For more detail on Over-The-Top operation, consult
the LT6015 data sheet.
Different sources of error contribute to the maximum ac-
curacy that can be achieved in an application. Gain error,
offset voltage and common mode rejection error combine
tosettheinitialerror.Additionally,thegainerrorandoffset
voltage drift across the temperature range. The excellent
gain accuracy, low offset voltage, high CMRR, low offset
voltage drift and low gain error drift of the LT6375 all
combine to enable extremely accurate measurements.
OUTPUT
The output of the LT6375 can typically swing to within
5mV of either rail with no load and is capable of sourcing
andsinkingapproximately25mA. TheLT6375isinternally
compensated to drive at least 1nF of capacitance under
any output loading conditions. For larger capacitive loads,
a 0.22µF capacitor in series with a 150Ω resistor between
the output and ground will compensate the amplifier to
drive capacitive loads greater than 1nF. Additionally, the
LT6375 has more gain and phase margin as the resistor
divider ratio is increased.
Over-The-Top OPERATION
When the input common mode voltage of the internal op
+
amp (V
) in the LT6375 is biased near or above the V
CMOP
supply,theopampisoperatingintheOver-The-Top region.
The op amp continues to operate with an input common
–
mode voltage of up to 76V above V (regardless of the
+
positive power supply voltage V ), but its performance is
Table 8. Error Budget Analysis
ERROR, ppm of FS
ERROR SOURCE
LT6375A
LT6375
COMPETITOR 1
COMPETITOR 2 LT6375A LT6375 COMPETITOR 1 COMPETITOR 2
Accuracy, T = 25°C
A
Initial Gain Error
Offset Voltage
Common Mode
0.0035% FS
540µV
0.006% FS
900µV
0.02% FS
1100µV
0.03% FS
500µV
35
54
60
90
200
110
617
300
50
195V/96dB =
3090µV
195V/89dB =
6920µV
195V/90dB =
6166µV
195V/86dB =
9770µV
309
692
977
Total Accuracy Error
398
842
927
1327
Temperature Drift
Gain
1ppm/°C ×60°C 1ppm/°C ×60°C 10ppm/°C ×60°C
10ppm/°C ×60°C
10µV/°C ×60°C
60
96
60
132
192
1034
600
90
600
60
Offset Voltage
16µV/°C ×60°C 22µV/°C ×60°C
Total Drift Error
15µV/°C ×60°C
156
554
690
1617
660
1987
Total Error
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APPLICATIONS INFORMATION
DISTORTION
The power dissipated in the internal resistors (P
)
RESD
depends on the input voltage, the resistor divider ratio
(DIV), the output voltage and the voltage on REF and the
otherreferencepins. The following equations andFigure5
The LT6375 features excellent distortion performance
when the internal op amp is operating within the supply
rails. Operating the LT6375 with input common mode
voltages that go from normal to Over-The-Top operation
will significantly degrade the LT6375’s linearity as the op
amp must transition between two different input stages.
show different components of P
corresponding to
RESD
different groups of LT6375’s internal resistors (assuming
that LT6375 is used with a dual supply configuration with
REF and all reference pins at ground).
2
P
P
P
P
P
= (V ) /(190k + 190k/(DIV – 1))
RESDA
RESDB
RESDC
RESDD
+IN
POWER DISSIPATION CONSIDERATIONS
2
= (V – V /DIV) /(190k)
–IN
+IN
2
Because of the ability of the LT6375 to operate on power
supplies up to 25V, to withstand very high input volt-
ages and to drive heavy loads, there is a need to ensure
the die junction temperature does not exceed 150°C. The
= (V /DIV) /(190k/(DIV – 2))
+IN
2
= (V /DIV – V ) /(190k)
+IN
OUT
= P
+ P
+ P
+ P
RESD
RESDA
RESDB
RESDC RESDD
LT6375 is housed in DF14 (θ = 43°C/W, θ = 4°C/W)
JA
JC
P
simplifies to:
RESD
and MS16 (θ = 130°C/W) packages.
JA
2
2
P
RESD
= 2(V ((DIV – 1)/DIV – V /V ) + V
)/190k
+IN
OUT +IN
OUT
In general, the die junction temperature (T ) can be esti-
J
mated from the ambient temperature (T ), and the device
In general, P
increases with higher input voltage,
A
RESD
power dissipation (P ):
higher resistor divider ratio (DIV), and lower output, REF
D
and reference pin voltages.
T = T + P • θ
JA
J
A
D
Example: An LT6375 in a DFN package mounted on a PC
board has a thermal resistance of 43°C/W. Operating on
25V supplies and driving a 2.5kΩ load to 12.5V with
+IN
given by:
Power is dissipated by the amplifier’s quiescent current,
by the output current driving a resistive load and by the
inputcurrentdrivingtheLT6375’sinternalresistornetwork.
V
= 270V and DIV = 25, the total power dissipation is
+
–
P = ((V – V ) • I ) + P + P
RESD
D
S
S
S
OD
2
2
For a given supply voltage, the worst-case output power
P = (50 • 0.6mA) + 12.5 /2.5k + 270 /197.92k
D
2
dissipationP
occurswiththeoutputvoltageathalf
OD(MAX)
of either supply voltage. P
+ (257.5 – 270/25) /190k
2
is given by:
OD(MAX)
+ (270/25) /8.26k + (270/25
2
2
– 12.5) /190k = 0.795W
P
= (V /2) /R
OD(MAX)
S
LOAD
+
V
= 25V
S
+
–REFA –REFB –REFC
V
P
RESDC
P
RESDD
190k
19k
38k
23.75k
P
RESDB
190k
–IN
+IN
V
–IN
= 270V – V
= 257.5V
OUT
–
+
OUT
REF
V
OUT
= 12.5V
P
RESDA
190k
19k
V
= 270V
+IN
190k
38k
23.75k
–
+REFA +REFB +REFC
SHDN
V
6375 F05
_
V
S
= –25V
Figure 5. Power Dissipation Example
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APPLICATIONS INFORMATION
connectingtheREFpinto+pins).Thesameconfigurations
provide inverting gains by grounding any pins intended
for the +signal source. The differential input resistance is
also tabulated as well as the amplification factor of the
internal gain section involved (noise-gain, which helps to
estimate the error-budget of the configuration).
Assuming a thermal resistance of 43°C/W, the die tem-
perature will experience a 34°C rise above ambient. This
impliesthatthemaximumambienttemperaturetheLT6375
should operate under the above conditions is:
T =150°C – 34°C = 116°C
A
Keep in mind that the DFN package has an exposed pad
Single-ended noninverting gains are also available as
shown in Table 10, including many that operate as buffers
(loaded only by the op amp input bias). A rich option set
exists by using the REF pin as an additional variable. Two
attenuation options exist that can accept signals outside
the power supply range since they only drive the +IN pin.
In Table 10, connections are identified asNC (no connect),
INPUT (driven by the input), OUT (fed back from the
output), or GROUND (grounded). Table 10 also includes
tabulations of the internal resistor divider (DIV), noise
gain (re-amplification), and the input loading presented
by the circuit.
which can be used to lower the θ of the package. The
JA
more PCB metal connected to the exposed pad, the lower
the thermal resistance.
The MSOP package has no exposed pad and a higher
thermal resistance (θ = 130°C/W). It should not be used
JA
in applications which have a high ambient temperature,
require driving a heavy load, or require an extreme input
voltage.
THERMAL SHUTDOWN
For safety, the LT6375 will enter shutdown mode when
the die temperature rises to approximately 163°C. This
thermal shutdown has approximately 9°C of hysteresis
requiring the die temperature to cool 9°C before enabling
the amplifier again.
USE AS PRECISION AC GAIN BLOCK
In AC-coupled applications operating from a single power
supply, it is useful to set the output voltage at mid-supply
to maximize dynamic range. The LT6375 readily supports
this with no additional biasing components by connecting
USE AT OTHER PRECISION DC GAINS
+
–
specific pins to the V and V potentials and AC-coupling
the signal paths. Table 11 shows the available inverting
gains and also tabulates the load resistances presented at
the input. In Table 11, connections are identified as NC (no
connect), AC IN (AC-coupled to the input) OUT (fed back
The array of resistors within the LT6375 provides numer-
ousconfigurableconnectionsthatprovideprecisiongains
other than the unity differential gain options described
previously. Note that only the +IN and –IN pins can oper-
ate outside of the supply window. Since most of these
alternate configurations involve driving the REFx pins, as
well as the +IN and –IN pins, the input signals must be
less than the supply voltages. Fully differential gains are
available as shown in Table 9, and may be output-shifted
with a REF offset signal. These configurations allow the
LT6375 to be used as a versatile precision gain block with
essentially no external components besides the supply
decoupling. In most cases, only a single positive supply
will be required. In Table 9, connections are identified as
NC (no connect), INPUT (refers to both inputs driven,
+signalto+pins,–signalto–pins),CROSS(referstoinputs
cross-coupled, +signal to –pins, –signal to +pins), OUT
(refers to the output fed back to –pins), or REF (refers to
+
–
from the output), tied to V , tied to V , or AC GND (AC-
grounded). All pins that require an AC ground can share
a single bypass capacitor. Likewise, all pins driven from
the source signal may share a coupling capacitor as well.
The output should also connect to the load circuitry using
a coupling capacitor to block the mid-supply DC voltage.
The LT6375 may also be used for single-supply nonin-
verting AC gains by employing a combination of input
attenuation and re-amplification. With numerous choices
ofattenuationandre-amplification,severalhundredoverall
gaincombinationsarepossible, rangingfrom0.167to23.
ThecombinationsaremoreplentifulthantheDCconfigura-
tions because there is no constraint on matching internal
source resistances to minimize offset.
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The input attenuator section dedicates some pins to es-
tablishing a mid-supply bias point and with the remaining
pins, provides several choices of input signal division fac-
tors as shown in Table 12. The high attenuations that only
use +IN for the signal path can accept waveform peaks
that significantly exceed the supply range. Table 12 also
includes tabulations of the resulting AC load resistance
presented to the signal source. Here again, all pins that
require an AC-ground connection may share a single by-
pass capacitor, and all AC signal connections may share
a coupling capacitor. Note that configurations with +IN to
+
V will bias at 50% of supply, while the others shown will
bias at 38% of supply.
The single-supply AC-coupled noninverting circuit is
completed by configuring the post-attenuator amplifica-
tion factor. Table 13 shows the available re-amplification
factors. Once again, all pins that require an AC-ground
connection may share a single bypass capacitor, and
the output should use a coupling capacitor to its load
destination as well.
Table 9. Configurations for Precision Differential Gains Other Than Unity
LT6375 DIFFERENTIAL AND INVERTING PRECISION DC GAINS
GAIN
0.167
0.333
0.5
1.5
2
±IN
CROSS
NC
±REFA
INPUT
INPUT
INPUT
NC
±REFB
OUT/REF
OUT/REF
OUT/REF
CROSS
CROSS
CROSS
OUT/REF
OUT/REF
OUT/REF
INPUT
INPUT
INPUT
INPUT
NC
±REFC
CROSS
CROSS
CROSS
INPUT
INPUT
NC
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
DIFF R (k)
NOISE GAIN
4.2
IN
20
21
20
29
27
25
20
21
20
17
63
76
63
42
48
42
38
35
27
29
27
25
24
20
21
20
16
17
16
4.0
INPUT
OUT/REF
CROSS
OUT/REF
CROSS
NC
4.2
7.5
NC
15.0
8.5
2.5
2.833
3
INPUT
INPUT
INPUT
INPUT
INPUT
NC
INPUT
INPUT
INPUT
CROSS
NC
4.2
4.0
3.167
3.5
4
INPUT
OUT/REF
CROSS
NC
4.2
12.5
7.0
5
NC
NC
6.0
6
INPUT
CROSS
NC
NC
NC
7.0
7
NC
INPUT
INPUT
INPUT
NC
10.0
9.0
8
NC
NC
9
INPUT
NC
NC
NC
10.0
11.0
12.0
15.0
14.0
15.0
16.0
17.0
20.0
19.0
20.0
25.0
24.0
25.0
10
INPUT
INPUT
NC
NC
11
INPUT
CROSS
NC
NC
NC
12
INPUT
INPUT
INPUT
INPUT
INPUT
NC
INPUT
INPUT
INPUT
NC
13
NC
14
INPUT
NC
NC
15
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
16
INPUT
CROSS
NC
NC
17
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
18
NC
19
INPUT
CROSS
NC
NC
22
INPUT
INPUT
INPUT
23
24
INPUT
6375fa
22
For more information www.linear.com/LT6375
LT6375
APPLICATIONS INFORMATION
Table 10. Configurations for Precision Noninverting Gains
LT6375 NONINVERTING PRECISION DC GAINS
NOISE
GAIN
GAIN FEATURE
+IN
+REFA
+REFB
+REFC
REF
–IN
–REFA
–REFB
OUT
OUT
NC
–REFC
DIV
25
R (k)
IN
0.167 Wide Input INPUT GROUND GROUND GROUND GROUND GROUND GROUND
GROUND 4.167
GROUND 4.167
198
103
302
48
0.333
0.5
INPUT GROUND GROUND GROUND INPUT
GROUND GROUND
12.5
10
Wide Input INPUT
NC
GROUND INPUT GROUND GROUND
NC NC GROUND INPUT
NC
GROUND GROUND
OUT
NC
NC
GROUND
NC
GROUND
GROUND
GROUND
5
4
5
0.833
1
NC
OUT
NC
4.8
INPUT
OUT
5
170
38
1.167
1.333
1.5
INPUT GROUND INPUT GROUND INPUT
GROUND GROUND
OUT
OUT
OUT
OUT
OUT
GROUND
OUT
OUT
GROUND 4.167
3.571
3
GROUND GROUND GROUND INPUT
NC
NC
NC
GROUND
GROUND
GROUND
GROUND
NC
GROUND
GROUND
GROUND
GROUND
NC
4
4
36
NC
NC
GROUND GROUND INPUT
INPUT
2.667
2.400
2.182
3.500
1.846
1.714
3
34
1.667
1.833
2
INPUT GROUND GROUND GROUND
NC
4
33
INPUT
INPUT
INPUT GROUND GROUND
NC
INPUT
NC
NC
4
32
NC
GROUND
NC
INPUT
INPUT
NC
GROUND
NC
7
37
2.167
2.333
2.5
GROUND GROUND INPUT
INPUT GROUND INPUT
GROUND
GROUND
NC
GROUND
GROUND
4
32
NC
NC
4
33
NC
GROUND INPUT
NC
OUT
NC
GROUND GROUND
7.5
4
57
2.667
2.833
3
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
NC
INPUT GROUND
NC
GROUND
OUT
OUT
GROUND
1.500
1.471
2.500
1.263
1.250
2.143
1.087
1
36
INPUT GROUND INPUT
INPUT GROUND GROUND
GROUND GROUND
GROUND 4.167
35
OUT
NC
NC
GROUND GROUND
7.5
4
53
3.167
3.333
3.5
INPUT GROUND INPUT
INPUT GROUND INPUT
NC
GROUND
OUT
OUT
GROUND
48
INPUT
GROUND GROUND
OUT NC
INPUT GROUND GROUND GROUND
GROUND 4.167
7.5
GROUND 4.167
GROUND
GROUND 4.167
47
NC
INPUT GROUND INPUT
GROUND GROUND
51
3.833
4
GROUND INPUT
INPUT
INPUT
INPUT
NC
OUT
OUT
103
Buffer
Buffer
INPUT
INPUT
INPUT
NC
INPUT
INPUT
NC
INPUT
INPUT
NC
NC
GROUND
4
Hi-Z
Hi-Z
302
Hi-Z
226
Hi-Z
110
Hi-Z
Hi-Z
321
Hi-Z
Hi-Z
200
Hi-Z
Hi-Z
103
4.167
4.5
INPUT
GROUND GROUND
OUT
1
INPUT GROUND
OUT
OUT
NC
NC
NC
GROUND
GROUND
NC
5
5
1.111
1
5
Buffer
Buffer
INPUT
INPUT
NC
NC
NC
NC
NC
NC
GROUND
NC
NC
5.5
INPUT
INPUT
GROUND
INPUT
NC
NC
OUT
GROUND
NC
NC
6
1.091
1
6
INPUT
INPUT
INPUT
INPUT
NC
NC
GROUND
NC
6
6.5
NC
INPUT GROUND
OUT
NC
GROUND GROUND
GROUND NC
GROUND GROUND
7.5
7
1.154
1
7
Buffer
Buffer
NC
NC
NC
INPUT
NC
GROUND
OUT
NC
7.5
INPUT
NC
NC
7.5
9
1
8
NC
INPUT GROUND
INPUT GROUND
NC
NC
NC
GROUND
NC
1.125
1
8.5
Buffer
Buffer
NC
NC
NC
OUT
GROUND GROUND
8.5
9
9
INPUT
INPUT
NC
NC
NC
INPUT
NC
NC
NC
NC
NC
NC
NC
GROUND
GROUND
GROUND
NC
1
9.5
INPUT
INPUT
INPUT
NC
INPUT GROUND
OUT
GROUND
NC
10
10
11
1.053
1
10
Buffer
Buffer
NC
NC
NC
NC
NC
GROUND
NC
11
INPUT
NC
GROUND
1
11.5
GROUND INPUT
INPUT
INPUT GROUND
OUT
GROUND GROUND GROUND 12.5
1.087
6375fa
23
For more information www.linear.com/LT6375
LT6375
APPLICATIONS INFORMATION
Table 10. Configurations for Precision Noninverting Gains
NOISE
GAIN
GAIN FEATURE
+IN
INPUT
INPUT
NC
+REFA
INPUT
INPUT
NC
+REFB
NC
+REFC
NC
REF
–IN
–REFA
–REFB
–REFC
DIV
R (k)
IN
12
12.5
13
14
15
16
17
18
19
20
23
24
25
Buffer
Buffer
INPUT
INPUT
GROUND GROUND
NC
NC
12
1
Hi-Z
Hi-Z
205
Hi-Z
Hi-Z
Hi-Z
Hi-Z
201
Hi-Z
Hi-Z
198
Hi-Z
Hi-Z
INPUT
INPUT
INPUT
INPUT
INPUT
NC
INPUT
OUT
NC
GROUND GROUND GROUND 12.5
1
INPUT GROUND
NC
NC
NC
GROUND GROUND
GROUND GROUND
GROUND GROUND
14
14
15
16
17
19
19
20
24
24
25
1.077
Buffer
Buffer
Buffer
Buffer
INPUT
NC
NC
INPUT
NC
NC
NC
NC
NC
1
INPUT
INPUT
NC
GROUND
NC
1
INPUT
NC
NC
GROUND GROUND
NC
1
INPUT GROUND GROUND GROUND GROUND
NC
1
NC
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
NC
INPUT GROUND
NC
NC
GROUND
GROUND
NC
NC
NC
GROUND
GROUND
GROUND
1.056
Buffer
Buffer
INPUT
INPUT
NC
NC
INPUT
INPUT
NC
1
NC
INPUT
GROUND GROUND
1
1.043
1
INPUT
INPUT
INPUT
INPUT GROUND
NC
NC
GROUND GROUND GROUND
GROUND GROUND GROUND
Buffer
Buffer
INPUT
INPUT
INPUT
INPUT
NC
INPUT
GROUND GROUND GROUND GROUND
1
Table 11. Configurations for Single-Supply AC-Coupled Inverting Gains
LT6375 SINGLE-SUPPLY INVERTING AC GAINS
GAIN
–3
–IN
NC
–REFA
AC IN
AC IN
NC
–REFB
OUT
OUT
AC IN
AC IN
NC
–REFC
AC IN
AC IN
NC
+IN
+REFA
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
+REFB
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
+REFC
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
REF
AC R (k)
IN
+
–
V
V
11
10
38
32
24
21
19
17
15
14
13
12
11
10
8
+
–
–3.167
–5
AC IN
NC
V
V
+
–
V
V
+
–
–6
AC IN
NC
NC
NC
V
V
+
–
–8
NC
AC IN
AC IN
NC
V
V
+
–
–9
AC IN
NC
NC
NC
V
V
+
–
–10
–11
–13
–14
–15
–16
–18
–19
–23
–24
AC IN
AC IN
NC
NC
V
V
+
–
AC IN
NC
NC
NC
V
V
+
–
AC IN
AC IN
AC IN
AC IN
NC
AC IN
AC IN
NC
V
V
+
–
AC IN
NC
NC
V
V
+
–
AC IN
AC IN
AC IN
AC IN
AC IN
AC IN
V
V
+
–
AC IN
NC
NC
V
V
+
–
AC IN
AC IN
AC IN
AC IN
V
V
+
–
AC IN
NC
NC
V
V
+
–
AC IN
AC IN
V
V
+
–
AC IN
V
V
8
6375fa
24
For more information www.linear.com/LT6375
LT6375
APPLICATIONS INFORMATION
Table 12. Configurations for Single-Supply AC-Coupled Input Attenuations
LT6375 SINGLE-SUPPLY AC ATTENUATOR CONFIGURATIONS
DIV
1.087
1.111
1.133
1.154
1.2
+IN
+REFA
AC IN
AC IN
AC IN
NC
+REFB
AC IN
NC
+REFC
AC IN
AC IN
NC
REF
AC R (k)
IN
+
–
V
V
103
106
108
110
114
119
38
+
–
V
V
+
–
V
AC IN
AC IN
NC
V
+
–
V
AC IN
NC
V
+
–
V
AC IN
NC
V
+
–
1.25
1.389
1.4
V
NC
AC IN
AC IN
NC
V
+
–
V
AC IN
NC
AC GND
AC IN
AC GND
AC GND
AC IN
V
+
–
V
V
133
46
+
–
1.7
V
AC IN
NC
NC
V
+
–
1.875
1.923
2.083
2.182
2.273
2.3
V
AC IN
V
51
+
–
V
AC GND
AC IN
AC IN
AC IN
AC IN
AC IN
AC IN
AC GND
AC GND
AC GND
NC
AC IN
V
30
+
–
AC IN
AC IN
AC IN
NC
V
V
AC IN
NC
30
+
–
V
V
32
+
–
V
V
AC GND
NC
31
+
–
V
V
34
+
–
2.4
NC
V
V
AC GND
33
+
–
2.5
V
AC GND
AC GND
AC IN
AC GND
AC IN
NC
V
32
+
–
3.125
3.4
V
V
35
+
–
V
V
54
+
–
5
V
AC IN
AC GND
V
47
+
–
7.5
AC IN
AC IN
AC IN
AC IN
AC IN
AC IN
V
V
AC IN
AC IN
NC
110
103
205
204
198
198
+
–
12
AC GND
NC
V
V
+
–
14
V
V
+
–
15
NC
V
V
AC GND
NC
+
–
24
AC GND
AC GND
V
V
+
–
25
V
V
AC GND
6375fa
25
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LT6375
APPLICATIONS INFORMATION
Table 13. Configurations for Single-Supply AC-Coupled Re-Amplications
LT6375 NONINVERTING AC RE-AMPLIFICATIONS
GAIN
4
–IN
NC
–REFA
AC GND
AC GND
NC
–REFB
OUT
–REFC
AC GND
AC GND
AC GND
NC
4.167
5
AC GND
OUT
OUT
NC
6
NC
NC
AC GND
AC GND
AC GND
AC GND
NC
7
AC GND
OUT
NC
NC
7.5
8.5
9
NC
AC GND
NC
OUT
AC GND
NC
NC
AC GND
AC GND
NC
10
11
12
12.5
14
15
16
17
19
20
24
25
AC GND
NC
NC
NC
AC GND
AC GND
AC GND
NC
NC
AC GND
OUT
NC
NC
AC GND
AC GND
AC GND
AC GND
AC GND
NC
AC GND
AC GND
AC GND
NC
NC
AC GND
NC
NC
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
AC GND
NC
NC
AC GND
AC GND
AC GND
AC GND
AC GND
NC
NC
AC GND
AC GND
AC GND
6375fa
26
For more information www.linear.com/LT6375
LT6375
TYPICAL APPLICATIONS
Telecom Supply Monitor
V
= 12V
S
+
–REFA
19k
–REFB
38k
–REFC
23.75k
V
190k
190k
–IN
+IN
–
+
V
OUT
REF
BAT
6
V
BAT
= 48V
V
OUT
=
190k
190k
19k
+REFA
38k
23.75k
+REFC
–
+REFB
SHDN
V
6375 TA02
27dB Audio Gain Stage
V
S
= 3.3V TO 50V
+
–REFA
19k
–REFB
38k
–REFC
23.75k
V
190k
2.2µF
190k
–IN
+IN
V
2.2µF
–
+
IN
OUT
REF
V
OUT
190k
V
OUT
= –24
V
IN
190k
19k
+REFA
38k
23.75k
+REFC
–
+REFB
SHDN
V
6375 TA03
2.2µF
6375fa
27
For more information www.linear.com/LT6375
LT6375
TYPICAL APPLICATIONS
±±5 mA Ho wl anAꢀCuur aꢁAꢂ HCuꢃr
+
V
S
+
–REFA
19k
–REFB
38k
–REFC
23.75k
V
190k
190k
–IN
+IN
–
+
OUT
REF
V
OUT
190k
V
= 1V
R
CTL
S
32.4Ω
V
V
OUT
41.6k
CTL
I
=
–
OUT
6 • R
S
190k
19k
38k
23.75k
+REFC
LOAD
–
+REFA
+REFB
SHDN
V
–
6375 TA04
V
S
Pur ꢃisiHaARr fr ur aꢃr ADivinr u/BCffr u
V
REF
+
–REFA
19k
–REFB
38k
–REFC
23.75k
V
190k
190k
–IN
+IN
–
+
V
OUT
REF
REF
V
OUT
=
2
190k
190k
19k
+REFA
38k
23.75k
+REFC
–
+REFB
SHDN
V
6375 TA05
6375fa
28
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LT6375
PACKAGE DESCRIPTION
Pwr l sr Aur fr uAꢁHAhꢁꢁp://ooo .wiar l u.ꢃH5 /puHnCꢃꢁ/LT637±#pl ꢃkl giagAfHuAꢁhr A5 HsꢁAur ꢃr aꢁApl ꢃkl gr Anul o iags.
DF Package
14(12)-Lead Plastic DFN (4mm × 4mm)
(Reference LTC DWG # 05-08-1963 Rev Ø)
3.00 REF
ꢀ.00
BSC
0.70 0.05
4.50 0.05
ꢀ.70 0.05
3.ꢀ0 0.05
3.38 0.05
PACKAGE OUTLINE
0.25 0.05
0.50 BSC
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
3.00 REF
4.00 0.ꢀ0
(4 SIDES)
ꢀ.00
BSC
8
ꢀ4
0.40 0.ꢀ0
3.38 0.ꢀ0
ꢀ.70 0.ꢀ0
PIN ꢀ NOTCH
0.35 × 45°
CHAMFER
PIN ꢀ
TOP MARK
(NOTE 6)
(DFꢀ4)(ꢀ2) DFN ꢀꢀꢀ3 REV 0
7
R = 0.ꢀꢀ5
TYP
ꢀ
0.25 0.05
0.50 BSC
0.200 REF
0.75 0.05
BOTTOM VIEW—EXPOSED PAD
0.00 – 0.05
NOTE:
ꢀ. PACKAGE OUTLINE DOES NOT CONFORM TO JEDEC MO-229
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.ꢀ5mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN ꢀ LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
6375fa
29
For more information www.linear.com/LT6375
LT6375
PACKAGE DESCRIPTION
Pwr l sr Aur fr uAꢁHAhꢁꢁp://ooo .wiar l u.ꢃH5 /puHnCꢃꢁ/LT637±#pl ꢃkl giagAfHuAꢁhr A5 HsꢁAur ꢃr aꢁApl ꢃkl gr Anul o iags.
MS Package
16 (12)-Lead Plastic MSOP with 4 Pins Removed
(Reference LTC DWG # 05-08-1847 Rev B)
1.0
0.889 ±0.127
(.035 ±.005)
(.0394)
BSC
5.10
3.20 – 3.45
(.201)
4.039 ±0.102
(.159 ±.004)
(NOTE 3)
(.126 – .136)
MIN
0.280 ±0.076
(.011 ±.003)
REF
16 14 121110
9
0.50
(.0197)
BSC
0.305 ±0.038
(.0120 ±.0015)
TYP
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
4.90 ±0.152
(.193 ±.006)
RECOMMENDED SOLDER PAD LAYOUT
DETAIL “A”
0.254
(.010)
0° – 6° TYP
1
3 5 6 7 8
GAUGE PLANE
1.0
(.0394)
BSC
0.53 ±0.152
(.021 ±.006)
0.86
(.034)
REF
1.10
(.043)
MAX
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.17 – 0.27
(.007 – .011)
TYP
0.1016 ±0.0508
(.004 ±.002)
MSOP (MS12) 0213 REV B
0.50
(.0197)
BSC
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
6375fa
30
For more information www.linear.com/LT6375
LT6375
REVISION HISTORY
REV
DmTE
DEꢂ ꢀRIPTION
PmGEANUMBER
A
12/15 Added A-grade.
1-7, 15, 19
6375fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
31
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LT6375
TYPICAL APPLICATION
Biniur ꢃꢁiHal wAFCwwARl agr AꢀCuur aꢁAMHaiꢁHu
V
S
= 5V (OR 2V GREATER THAN V
)
MON
+
–REFA
19k
–REFB
38k
–REFC
23.75k
V
190k
V
= 0V TO 3V
MON
190k
–IN
+IN
–
OUT
R
V
= V
+ 24 • (V
)
SENSE
SENSE
OUT
REF
REF
190k
+
REF
LOAD
V
= 1.25V
190k
19k
+REFA
38k
23.75k
+REFC
–
+REFB
SHDN
V
6375 TA06
NOTE: OPERATES OVER FULL RANGE OF LOAD VOLTAGE
RELATED PARTS
PmRTANUMBER
DEꢂ ꢀRIPTION
ꢀOMMENTꢂ
LT1990
250V Input Range Difference Amplifier
Precision, 100µA Gain Selectable Amplifier
Precision, 100µA Gain Selectable Amplifier
2.7V to 36V Operation, CMRR > 70dB, Input Voltage = 250V
LT1991
2.7V to 36V Operation, 50μV Offset, CMRR > 75B, Input Voltage = 60V
Micropower, Pin Selectable Up to Gain = 118
LT1996
LT1999
High Voltage, Bidirectional Current Sense
Amplifier
–5V to 80V, 750 µV, CMRR 80dB 100kHz Gain: 10V/V, 20V/V, 50V/V
LT6015/LT6016/ Single, Dual, and Quad, Over-The-Top
3.2MHz, 0.8V/µs, 50µV V , 3V to 50V V , 0.335mA I , RRIO
OS S S
LT6017
LTC6090
LT6108
Precision Op Amp
140V Operational Amplifier
50pA I , 1.6mV V , 9.5V to 140V V , 4.5mA I , RR Output
B OS S S
High Side Current Sense Amplifier with
Reference and Comparator with Shutdown
2.7V to 60V, 125µV, Resistor Set Gain, 1.25% Threshold Error
LT1787/
LT1787HV
Precision, Bidirectional High Side Current
Sense Amplifier
2.7V to 60V Operation, 75μV Offset, 60μA Current Draw
LTC6101/
LTC6101HV
High Voltage High Side Current Sense
Amplifier
4V to 60V/5V to 100V Operation, External Resistor Set Gain, SOT23
LTC6102/
LTC6102HV
Zero Drift High Side Current Sense Amplifier
4V to 60V/5V to 100V Operation, 10μV Offset, 1μs Step Response,
MSOP8/DFN Packages
LTC6104
Bidirectional, High Side Current Sense
4V to 60V, Gain Configurable, 8-Pin MSOP Package
6375fa
LT 1215 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
32
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LINEAR TECHNOLOGY CORPORATION 2015
(408)432-1900 FAX: (408) 434-0507 www.linear.com/LT6375
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