LT1638CS8#TR [Linear]
LT1638 - 1.2MHz, 0.4V/µs Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;
| 型号： | LT1638CS8#TR |
| 厂家： | 
Linear |
| 描述： | LT1638 - 1.2MHz, 0.4V/µs Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 运算放大器 |
| 文件： | 总16页 (文件大小：241K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1638/LT1639
1.2MHz, 0.4V/μs
Over-The-Top Micropower
Rail-to-Rail Input and Output
Op Amps
U
FEATURES
DESCRIPTIO
The LT®1638 is a low power dual rail-to-rail input and output
operationalamplifieravailableinthestandard8-pinPDIPand
SO packages as well as the 8-lead MSOP package. The
LT1639 is a low power quad rail-to-rail input and output
operationalamplifierofferedinthestandard14-pinPDIPand
surface mount packages. For space limited applications the
LT1638 is available in a 3mm x 3mm x 0.8mm dual fine pitch
leadless package (DFN).
Operates with Inputs Above V+
■
■
Rail-to-Rail Input and Output
■
■
■
■
■
■
■
■
■
■
■
■
Low Power: 230μA per Amplifier Max
Gain Bandwidth Product: 1.2MHz
Slew Rate: 0.4V/μs
High Output Current: 25mA Min
Specified on 3V, 5V and 15V Supplies
Reverse Battery Protection to 18V
No Supply Sequencing Problems
High Voltage Gain: 1500V/mV
Single Supply Input Range: –0.4V to 44V
High CMRR: 98dB
No Phase Reversal
Available in 14-Lead SO, 8-Lead MSOP and DFN
Packages
The LT1638/LT1639 op amps operate on all single and
split supplies with a total voltage of 2.5V to 44V drawing
only 170μA of quiescent current per amplifier. These
amplifiers are reverse battery protected and draw no
current for reverse supply up to 18V.
The input range of the LT1638/LT1639 includes both
supplies,andauniquefeatureofthisdeviceisitscapability
to operate over the top with either or both of its inputs
above V+. The inputs handle 44V, both differential and
common mode, independent of supply voltage. The input
stage incorporates phase reversal protection to prevent
false outputs from occurring when the inputs are below
the negative supply. Protective resistors are included in
the input leads so that current does not become excessive
when the inputs are forced below the negative supply. The
LT1638/LT1639 can drive loads up to 25mA and still
maintain rail-to-rail capability. The op amps are unity-gain
stable and drive all capacitive loads up to 1000pF when
optional output compensation is used.
U
APPLICATIO S
■
Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
Supply Current Sensing
Battery Monitoring
Micropower Active Filters
■
■
■
■
4mA to 20mA Transmitters
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Over-The-Top is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
U
Output Voltage vs Input Voltage
TYPICAL APPLICATIO
Over-The-Top® Comparator with
100mV Hysteresis Centered at 0mV
5V
V
CC
10k
1M
V1
V
CC
V
CC
1M
+
+
A
B
V0
1/2 LT1638
1/2 LT1638
1M
–
–
0V
10k
1M
1638/39 TA01
V2
1638/39 TA02
V
CC
= 5V, V
CM
= 0V TO 44V, t = 27μs
PD
20mV/DIV
16389fd
1
LT1638/LT1639
W W
U W
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V+ to V–) .............................. 44V
Input Differential Voltage ......................................... 44V
Input Current ...................................................... 25mA
Output Short-Circuit Duration (Note 2).........Continuous
Operating Temperature Range (Note 3)
Specified Temperature Range (Note 4)
LT1638C/LT1639C ............................. –40°C to 85°C
LT1638I/LT1639I................................ –40°C to 85°C
LT1638H/LT1639H ........................... –40°C to 125°C
Junction Temperature........................................... 150°C
DD Package ...................................................... 125°C
Storage Temperature Range ................. –65°C to 150°C
DD Package ...................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
LT1638C/LT1639C ............................. –40°C to 85°C
LT1638I/LT1639I................................ –40°C to 85°C
LT1638H/LT1639H ........................... –40°C to 125°C
U
W U
PACKAGE/ORDER INFORMATION
ORDER
PART NUMBER
ORDER
PART NUMBER
TOP VIEW
TOP VIEW
LT1638CN8
LT1638CMS8
LT1638IMS8
+
1
2
3
4
8
7
6
5
OUT A
–IN A
+IN A
V
OUT A
–IN A
+IN A
1
2
3
4
8 V+
LT1638IN8
LT1638CS8
LT1638IS8
LT1638HS8
7 OUT B
6 –IN B
5 +IN B
OUT B
–IN B
+IN B
A
A
B
–
V
B
–
V
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PART
MARKING*
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
TJMAX = 150°C, θJA = 300°C/W (MS8)
S8 PART MARKING
TJMAX = 150°C, θJA = 150°C/W (N8)
TJMAX = 150°C, θJA = 190°C/W (S8)
LTCY
1638
1638I
1638H
ORDER
ORDER
TOP VIEW
PART NUMBER
PART NUMBER
OUT A
–IN A
+IN A
1
2
3
4
5
6
7
14 OUT D
13 –IN D
TOP VIEW
LT1639CN
LT1639IN
LT1639CS
LT1639IS
LT1639HS
LT1638CDD
LT1638IDD
A
B
D
C
+
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
12 +IN D
–
+
OUT B
–IN B
+IN B
V
11
V
A
+IN B
–IN B
OUT B
10 +IN C
B
–
V
9
8
– IN C
OUT C
DD PART MARKING*
LAAL
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 160°C/W (NOTE 10)
N PACKAGE
S PACKAGE
14-LEAD PDIP 14-LEAD PLASTIC SO
UNDERSIDE METAL INTERNALLY CONNECTED TO V–
TJMAX = 150°C, θJA = 130°C/W (N)
TJMAX = 150°C, θJA = 160°C/W (S)
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
*The temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
16389fd
2
LT1638/LT1639
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C.
VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
LT1638C/LT1639C, LT1638I/LT1639I
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
LT1638 N, S Packages
200
600
850
950
μV
μV
μV
OS
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1639 N, S Packages
300
350
400
700
950
1050
μV
μV
μV
μV
μV
μV
μV
μV
μV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1638 MS8 Package
900
1150
1450
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1638 DD Package
1100
1350
1450
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Input Offset Voltage Drift
(Note 9)
LT1638/LT1639 N, S Packages
LT1638MS8, LT1638DD
●
●
2
2.5
6
7
μV/°C
μV/°C
I
I
Input Offset Current
●
●
1
6
2.5
nA
μA
nA
μA
nA
OS
B
V
V
= 44V (Note 5)
CM
Input Bias Current
●
●
20
8
0.1
50
30
= 44V (Note 5)
CM
V = 0V
S
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
1
μV
nV/√Hz
pA/√Hz
P-P
e
i
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
20
0.3
n
f = 1kHz
n
R
IN
Differential
Common Mode, V = 0V to 44V
1
1.4
2.5
5.5
MΩ
MΩ
CM
C
Input Capacitance
5
pF
V
IN
Input Voltage Range
●
0
44
CMRR
Common Mode Rejection Ratio
V
V
= 0V to V – 1V
= 0V to 44V (Note 8)
●
●
88
80
98
88
dB
dB
CM
CM
CC
A
Large-Signal Voltage Gain
V = 3V, V = 500mV to 2.5V, R = 10k
200
133
100
1500
V/mV
V/mV
V/mV
VOL
S
O
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V = 5V, V = 500mV to 4.5V, R = 10k
400
250
200
1500
V/mV
V/mV
V/mV
S
O
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
V
Output Voltage Swing Low
Output Voltage Swing High
Short-Circuit Current (Note 2)
V = 3V, No Load
●
●
3
250
8
450
mV
mV
OL
OH
S
V = 3V, I
= 5mA
S
SINK
V = 5V, No Load
●
●
3
500
8
700
mV
mV
S
V = 5V, I
S
= 10mA
SINK
V = 3V, No Load
●
●
2.94
2.25
2.98
2.40
V
V
S
V = 3V, I
= 5mA
S
SOURCE
V = 5V, No Load
●
●
4.94
3.8
4.98
4.0
V
V
S
V = 5V, I
= 10mA
S
SOURCE
I
V = 3V, Short to GND
10
15
15
25
mA
mA
SC
S
V = 3V, Short to V
S
CC
V = 5V, Short to GND
15
15
20
25
mA
mA
S
V = 5V, Short to V
S
CC
16389fd
3
LT1638/LT1639
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C.
VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
LT1638C/LT1639C, LT1638I/LT1639I
SYMBOL
PARAMETER
CONDITIONS
V = 3V to 12.5V, V = V = 1V
MIN
TYP
100
27
MAX
UNITS
PSRR
Power Supply Rejection Ratio
Reverse Supply Voltage
Minimum Operating Supply Voltage
●
●
●
90
dB
V
S
CM
O
I = –100μA per Amplifier
S
18
2.4
170
2.7
V
I
Supply Current per Amplifier
(Note 6)
230
275
μA
μA
S
●
GBW
SR
Gain Bandwidth Product
(Note 5)
f = 5kHz
650
550
500
1075
0.38
kHz
kHz
kHz
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Slew Rate
(Note 7)
A = –1, R = ∞
0.210
0.185
0.170
V/μs
V/μs
V/μs
V
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
The ● denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C.
VS = 15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4)
LT1638C/LT1639C, LT1638I/LT1639I
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
LT1638 N, S Packages
250
800
1000
1100
μV
μV
μV
OS
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1639 N, S Packages
350
400
450
900
1100
1200
μV
μV
μV
μV
μV
μV
μV
μV
μV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1638 MS8 Package
1050
1250
1550
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1638 DDPackage
1250
1450
1550
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Input Offset Voltage Drift
(Note 9)
LT1638/LT1639 N, S Packages
LT1638MS8, LT1638DD
●
●
2
2.5
6
7
μV/°C
μV/°C
I
I
Input Offset Current
Input Bias Current
●
●
1
20
1
6
nA
nA
OS
B
50
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
0.1Hz to 10Hz
f = 1kHz
μV
P-P
e
i
20
0.3
nV/√Hz
pA/√Hz
n
f = 1kHz
n
R
Differential
Common Mode, V = –15V to 14V
1
2.5
500
MΩ
MΩ
IN
CM
C
Input Capacitance
4.5
pF
V
IN
Input Voltage Range
●
●
–15
80
29
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= –15V to 29V
88
dB
CM
A
V = 14V, R = 10k
0°C ≤ T ≤ 70°C
–40°C ≤ T ≤ 85°C
200
125
100
500
V/mV
V/mV
V/mV
VOL
O
L
●
●
A
A
V
Output Voltage Swing
No Load
●
●
14.9
13.7
14.95
14.0
V
V
O
I
= 10mA
OUT
16389fd
4
LT1638/LT1639
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the specified temperature
range, otherwise specifications are at TA = 25°C. VS = 15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4)
LT1638C/LT1639C, LT1638I/LT1639I
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Short-Circuit Current (Note 2)
Short to GND
25
20
15
40
mA
mA
mA
SC
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
PSRR
Power Supply Rejection Ratio
Supply Current per Amplifier
V = 1.5V to 22V
S
●
90
100
205
dB
I
280
350
μA
μA
S
●
GBW
SR
Gain Bandwidth Product
Slew Rate
f = 5kHz
750
650
600
1200
0.4
kHz
kHz
kHz
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
A = –1, R = ∞, V = 10V,
0.225
0.2
0.18
V/μs
V/μs
V/μs
V
L
O
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C.
VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = Half Supply unless otherwise specified. (Note 4)
LT1638H/LT1639H
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
LT1638S8
200
650
3
μV
mV
OS
●
LT1639S
300
750
3.2
μV
●
●
mV
Input Offset Voltage Drift (Note 9)
Input Offset Current
15
μV/°C
I
I
●
●
15
10
nA
μA
nA
μA
OS
B
V
V
= 44V (Note 5)
CM
CM
Input Bias Current
●
●
150
100
= 44V (Note 5)
Input Voltage Range
●
0.3
44
V
CMRR
Common Mode Rejection Ratio
V
V
= 0.3V to V – 1V
= 0.3V to 44V
●
●
76
72
dB
dB
CM
CM
CC
A
Large-Signal Voltage Gain
V = 3V, V = 500mV to 2.5V, R = 10k
200
20
1500
1500
V/mV
V/mV
VOL
S
O
L
●
V = 5V, V = 500mV to 4.5V, R = 10k
400
35
V/mV
V/mV
S
O
L
●
V
V
Output Voltage Swing Low
Output Voltage Swing High
No Load
●
●
●
15
900
1500
mV
mV
mV
OL
OH
I
= 5mA
SINK
V = 5V, I
S
= 10mA
SINK
V = 3V, No Load
●
●
2.9
2
V
V
S
V = 3V, I
S
= 5mA
SOURCE
V = 5V, No Load
●
●
4.9
3.5
V
V
S
V = 5V, I
= 10mA
S
SOURCE
PSRR
Power Supply Rejection Ratio
Minimum Supply Voltage
Reverse Supply Voltage
V = 3V to 12.5V, V = V = 1V
●
●
●
80
2.7
18
dB
V
S
CM
O
I = –100μA
S
V
I
Supply Current
(Note 6)
170
1075
0.38
230
450
μA
μA
kHz
kHz
S
●
●
●
GBW
SR
Gain Bandwidth Product
(Note 5)
f = 5kHz
650
350
Slew Rate
(Note 7)
A = –1, R = ∞
V
0.21
0.1
V/μs
V/μs
L
16389fd
5
LT1638/LT1639
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C, otherwise
specifications are at TA = 25°C. VS = 15V, VCM = 0V, VOUT = 0V, VSHDN = V– unless otherwise specified. (Note 4)
LT1638H/LT1639H
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
LT1638S8
250
850
3.4
μV
mV
OS
●
LT1639S
350
950
3.6
μV
●
●
●
●
●
mV
Input Offset Voltage Drift (Note 9)
Input Offset Current
15
25
μV/°C
nA
I
I
OS
B
Input Bias Current
250
nA
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= –14.7V to 29V
72
dB
CM
A
V = 14V, R = 10k
200
15
500
V/mV
V/mV
VOL
O
L
●
V
Output Voltage Swing
No Load
●
●
●
14.8
14
13.4
V
V
V
O
I
I
=
=
5mA
10mA
OUT
OUT
PSRR
Power Supply Rejection Ratio
Minimum Supply Voltage
Supply Current
V = 1.5V to 22V
●
●
84
dB
V
S
1.35
I
205
1200
0.4
280
550
μA
μA
kHz
kHz
S
●
●
●
GBW
SR
Gain Bandwidth Product
Slew Rate
f = 5kHz
750
400
A = –1, R = ∞, V = 10V,
0.225
0.1
V/μs
V/μs
V
L
O
Measure at V = 5V
O
Note 1: 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.
Note 5: V = 5V limits are guaranteed by correlation to V = 3V and
S
S
V = 15V or V = 22V tests.
S
S
Note 6: V = 3V limits are guaranteed by correlation to V = 5V and
S
S
V = 15V or V = 22V tests.
S
S
Note 2: A heat sink may be required to keep the junction temperature
below absolute maximum. This depends on the power supply voltage
and how many amplifiers are shorted.
Note 3: The LT1638C/LT1639C and LT1638I/LT1639I are guaranteed
functional over the operating temperature range of –40°C to 85°C. The
LT1638H/LT1639H are guaranteed functional over the operating
temperature range of –40°C to 125°C.
Note 4: The LT1638C/LT1639C are guaranteed to meet specified
performance from 0°C to 70°C and are designed, characterized and
expected to meet specified performance from –40°C to 85°C but not
tested or QA sampled at these temperatures. The LT1638I/LT1639I are
guaranteed to meet specified performance from –40°C to 85°C. The
LT1638H/LT1639H are guaranteed to meet specified performance from
–40°C to 125°C.
Note 7: Guaranteed by correlation to slew rate at V = 15V, and GBW at
S
V = 3V and V = 15V tests.
S
S
Note 8: This specification implies a typical input offset voltage of 2mV at
= 44V and a maximum input offset voltage of 5mV at V = 44V.
V
CM
CM
Note 9: This parameter is not 100% tested.
Note 10: The θ specified for the DD package is with minimal PCB heat
JA
spreading metal. Using expanded metal area on all layers of a board
reduces this value.
16389fd
6
LT1638/LT1639
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current vs
Common Mode Voltage
Supply Current vs Supply Voltage
Minimum Supply Voltage
400
300
300
280
260
240
220
200
180
160
140
120
100
10000
8000
6000
V
S
= 5V, 0V
T
= 125°C
A
200
100
T
= 25°C
A
T
= –55°C
A
60
40
0
T
= 25°C
A
–100
T
= –55°C
20
A
T
A
= –55°C
T
= 125°C
T
A
= 125°C
A
–200
–300
T
= 25°C
0
A
–20
–40
–400
0
1
2
3
4
5
0
5
10 15 20 25 30 35 40 45
SUPPLY VOLTAGE (V)
4.0
4.4
4.8
5.2
5.6
44
TOTAL SUPPLY VOLTAGE (V)
COMMON MODE VOLTAGE (V)
1638/39 G02
1638/39 G01
1638/39 G03
Output Saturation Voltage vs
Load Current (Output High)
Output Saturation Voltage vs
Load Current (Output Low)
Output Saturation Voltage vs
Input Overdrive
1
1
100
10
1
V
=
2.5V
V
V
=
OD
2.5V
= 30mV
V
V
=
S
OD
2.5V
= 30mV
S
S
NO LOAD
T
= 125°C
OUTPUT HIGH
A
0.1
T
= 125°C
A
T
= 25°C
A
T
= 25°C
0.1
A
0.01
OUTPUT LOW
T
= –55°C
A
T
= –55°C
A
0.01
0.001
0.001
0.01
0.1
1
10
0.001
0.01
0.1
1
10
10 20
40
60 70 80
100
90
0
30
50
SOURCING LOAD CURRENT (mA)
SINKING LOAD CURRENT (mA)
INPUT OVERDRIVE (mV)
1638/39 G04
1638/39 G05
1638/39 G06
Noise Voltage Density vs
Frequency
Input Noise Current Density
vs Frequency
0.1Hz to 10Hz Noise Voltage
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
70
60
50
40
30
20
10
0
V
= 2.5
S
0
1
2
3
4
5
6
7
8
9
10
1
10
100
1k
1
10
100
1k
TIME (SEC)
FREQUENCY (Hz)
FREQUENCY (Hz)
1638/39 G08
1638/39 G09
1638/39 G07
16389fd
7
LT1638/LT1639
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
Gain and Phase Shift vs
Frequency
Gain Bandwidth Product vs
Temperature
Slew Rate vs Temperature
100
90
80
70
60
50
40
1500
1400
1300
1200
1100
1000
900
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
f = 1kHz
V
= 2.5V
S
RISING, V
=
=
15V
80
S
PHASE
70
V
S
=
15V
RISING, V
2.5V
S
60
50
30
20
GAIN
40
30
20
10
0
FALLING, V
=
2.5V
S
10
0
FALLING, V
=
15V
V
=
2.5V
50
S
S
–10
–20
800
1
10
100
1000
–50
0
25
50
75 100 125
–50
0
25
75 100 125
–25
–25
FREQUENCY (kHz)
TEMPERATURE (°C)
TEMPERATURE (°C)
1638/39 G12
1638/39 G13
1638/39 G14
Gain Bandwidth Product and
Phase Margin vs Supply Voltage
Gain Bandwidth Product and
Phase Margin vs Load Resistance
PSRR vs Frequency
1500
1400
1300
1200
1100
1000
60
50
40
30
20
10
1500
1400
1300
1200
1100
1000
900
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
V
A
=
2.5V
= –1
= R = 100k
V
=
2.5V
S
V
F
S
R
G
f = 1kHz
PHASE MARGIN
PHASE MARGIN
POSITIVE SUPPLY
GAIN BANDWIDTH
NEGATIVE SUPPLY
GAIN BANDWIDTH
PRODUCT
800
–10
100
–10
1
10
LOAD RESISTANCE (kΩ)
0
5
10 15 20 25 30
35 40
TOTAL SUPPLY VOLTAGE (V)
45
1
10
100
1000
FREQUENCY (kHz)
1638/39 G17
1638/39 G16
1638/39 G15
CMRR vs Frequency
Channel Separation vs Frequency
Output Impedance vs Frequency
120
110
100
90
130
120
110
100
90
10k
1k
V
S
= 15V
V
=
2.5V
V
S
= 15V
S
A
= 10
V
80
100
10
A
= 100
V
70
60
50
A
= 1
V
80
40
1
70
30
60
0.1
20
0.1
0.1
1
10
100
1000
1
10
100
1
10
FREQUENCY (kHz)
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
1638/39 G20
1638/39 G18
1638/39 G19
16389fd
8
LT1638/LT1639
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Settling Time to 0.1% vs
Output Step
Capacitive Load Handling,
Undistorted Output Swing
vs Frequency
Overshoot vs Capacitive Load
10
8
100
90
80
70
60
50
40
30
20
10
0
35
30
25
20
15
10
5
V
= 15V
V
V
= 5V, 0V
DISTORTION ≤ 1%
R = 20k
L
S
S
V
=
15V
S
= 2.5V
CM
A
= 1
V
I
= 150μA
SOURCE
6
A
= –1
V
4
2
0
A
V
= 5
A
V
= 1
–2
–4
–6
–8
–10
A
= 10
A
= –1
25
V
V
V
=
2.5V
1
S
A
= 1
V
0
0
20
30
35
10
100
1000
10000
5
10
15
0.1
10
100
CAPACITIVE LOAD (pF)
SETTLING TIME (μs)
FREQUENCY (kHz)
1638/39 G22
1638/39 G23
1638/39 G21
Total Harmonic Distortion + Noise
vs Frequency
Total Harmonic Distortion + Noise
vs Load Resistance
Total Harmonic Distortion + Noise
vs Output Voltage
10
1
10
1
10
1
V
A
V
= 3V TOTAL
= 1
R
CM
= 10k, f = 1kHz
V
V
V
= 3V, 0V
S
V
L
S
V
= HALF SUPPLY
= 2V
OUT
P-P
= 2V AT 1kHz
A
V
A
V
A
V
A
V
= –1, V =
1.5V
= –1, V = 3V, 0V
= 1.2V
IN
P-P
S
CM
R
= 20k
S
L
= 1, V
= 1.5V
S
= 1, V = 3V, 0V
V
V
=
IN
1.5V
1V
S
S
=
0.1
0.1
0.1
V
V
= 3V, 0V
IN
S
= 0.5V TO 2.5V
0.01
0.001
0.01
0.01
A
= –1
= 1
V
V
V
= 3V, 0V
= 0.2V TO 2.2V
A
S
IN
V
0.001
0.001
0
1
2
3
0.01
0.1
1
10
100
0.1
1
10
100
OUTPUT VOLTAGE (V
P-P
)
FREQUENCY (Hz)
LOAD RESISTANCE TO GROUND (kΩ)
1638/39 G26
1638/39 G24
1638/39 G25
Open-Loop Gain
Large-Signal Response
Small-Signal Response
V
=
15V
S
R
= 2k
L
R
= 10k
L
R
= 50k
L
VS
=
15V
VS
V = 1
CL = 15pF
=
15V
1638/39 G29
1638/39 G28
A
V = 1
A
–20V
–10V
0V
10V
20V
OUTPUT VOLTAGE (5V/DIV)
1638/39 G27
16389fd
9
LT1638/LT1639
U
W U U
APPLICATIONS INFORMATION
Supply Voltage
The inputs are protected against excursions of 2V below
V– by an internal 1k resistor in series with each input and
a diode from the input to the negative supply. If the inputs
can go more than 2V below V–, an additional external
resistor is required. A 10k resistor will protect the input
against excursions as much as 10V below V–. The input
stage of the LT1638/LT1639 incorporates phase reversal
protection to prevent the output from phase reversing for
inputs below V–. There are no clamping diodes between
the inputs and the maximum differential input voltage is
44V.
The positive supply pin of the LT1638/LT1639 should be
bypassedwithasmallcapacitor(typically0.1μF)withinan
inch of the pin. When driving heavy loads an additional
4.7μF electrolytic capacitor should be used. When using
split supplies, the same is true for the negative supply pin.
The LT1638/LT1639 are protected against reverse battery
voltagesupto18V. Intheeventareversebatterycondition
occurs, the supply current is less than 1nA.
The LT1638/LT1639 can be shut down by removing V+. In
this condition the input bias current is less than 0.1nA,
even if the inputs are 44V above the negative supply.
Output
The output of the LT1638/LT1639 can swing within 20mV
of the positive rail with no load, and within 3mV of the
negative rail with no load. When monitoring voltages
within 20mV of the positive rail or within 3mV of the
negative rail, gain should be taken to keep the output from
clipping. The LT1638/LT1639 are capable of sinking and
sourcing over 40mA on 15V supplies; sourcing current
capability is reduced to 20mA at 5V total supplies as noted
in the electrical characteristics.
At temperatures greater than 70°C, when operating the
LT1638/LT1639 on total supplies of 10V or more, the
supply must not be brought up faster than 1V/μs. Increas-
ing the bypass capacitor and/or adding a small resistor in
series with the supply will limit the rise time.
Inputs
The LT1638/LT1639 have two input stages, NPN and PNP
(see the Simplified Schematic), resulting in three distinct
operating regions as shown in the Input Bias Current vs
Common Mode typical performance curve.
For input voltages about 0.8V or more below V+, the PNP
input stage is active and the input bias current is typically
–20nA. When the input common mode voltage is within
0.5Vofthepositiverail, theNPNstageisoperatingandthe
input bias current is typically 40nA. Increases in tempera-
ture will cause the voltage at which operation switches
from the PNP input stage to the NPN input stage to move
towards V+. The input offset voltage of the NPN stage is
untrimmed and is typically 600μV.
The LT1638/LT1639 are internally compensated to drive
at least 200pF of capacitance under any output loading
conditions. A 0.22μF capacitor in series with a 150Ω
resistor between the output and ground will compensate
these amplifiers for larger capacitive loads, up to 1000pF,
at all output currents.
Optional Output Compensation for
Capacitive Loads Greater than 200pF
V
+
IN
LT1638
1000pF
–
A Schottky diode in the collector of each NPN transistor
allow the LT1638/LT1639 to operate over the top, with
either or both of its inputs above V+. At about 0.3V above
V+ the NPN input transistor is fully saturated and the input
bias current is typically 8μA at room temperature. The
inputoffsetvoltageistypically2mVwhenoperatingabove
V+. The LT1638/LT1639 will operate with its inputs 44V
above V– regardless of V+.
0.22μF
150Ω
Distortion
There are two main contributors of distortion in op amps:
output crossover distortion as the output transitions from
sourcing to sinking current and distortion caused by
16389fd
10
LT1638/LT1639
U
W U U
APPLICATIONS INFORMATION
nonlinear common mode rejection. If the op amp is oper-
ating inverting there is no common mode induced distor-
tion. If the op amp is operating in the PNP input stage
(input is not within 0.8V of V+), the CMRR is very good,
typically 98dB. When the LT1638 switches between input
stagesthereissignificantnonlinearityintheCMRR.Lower
load resistance increases the output crossover distortion,
but has no effect on the input stage transition distortion.
For lowest distortion the LT1638/LT1639 should be oper-
ated single supply, with the output always sourcing
current and with the input voltage swing between ground
and (V+ – 0.8V). See the Typical Performance Character-
istics curves.
Gain
The open-loop gain is almost independent of load when
the output is sourcing current. This optimizes perfor-
mance in single supply applications where the load is
returned to ground. The typical performance curve of
Open-Loop Gain for various loads shows the details.
U
V
CC
TYPICAL APPLICATIONS
R5
With 1.2MHz bandwidth, Over-The-Top capability, re-
verse-battery protection and rail-to-rail input and output
features, the LT1638/LT1639 are ideal candidates for
general purpose applications.
100k
+
–
1/4 LT1639
LT1634-1.2V
D1
D2
R3
100k
The lowpass slope limiting filter in Figure 1 limits the
maximum dV/dT (not frequency) that it passes. When the
input signal differs from the output by one forward diode
drop, D1 or D2 will turn on. With a diode on, the voltage
across R2 will be constant and a fixed current, VDIODE/R2,
will flow through capacitor C1, charging it linearly instead
of exponentially. The maximum slope that the circuit will
pass is equal to VDIODE divided by (R2)(C1). No matter
how fast the input changes the output will never change
any faster than the dV/dT set by the diodes and (R2)(C).
–
R1
1k
V
1/4 LT1639
OUT
R2
V
+
IN
C1
R4
100k
LT1634-1.2V
D4
D3
–
+
1/4 LT1639
FOR R2 = 50k, C1 = 500pF,
MAXIMUM SLOPE = 0.048V/μs
D1
R6
100k
d
dt
1.2V
V
=
OUT
D2
(R2)(C1)
1638/39 F02
D1 TO D4 = IN4148
V
EE
R1
R2
V
IN
+
Response of Slope Limiting Filter
C1
V
d
V
D
1/2 LT1638
OUT
V
=
OUT(MAX)
dt
(R2)(C1)
–
FOR R1 = 10k, R2 = 100k, C1 = 1000pF
d
1638/39 F01
V
= 0.006V/μs
OUT(MAX)
dt
VOUT
Figure 1. Lowpass Slope Limiting Filter
A modification of this application is shown in Figure 2
using references instead of diodes to set the maximum
slope. By using references, the slope is independent of
temperature. A scope photo shows a 1VP-P, 2kHz input
signal with a 2V pulse added to the sine wave; the circuit
passes the 2kHz signal but limits the slope of the pulse.
VIN
1638/39 TA02
Figure 2. Lowpass Slope Limiting Filter with 0 TC
16389fd
11
LT1638/LT1639
U
TYPICAL APPLICATIONS
The Figure 4 application uses the LT1638 in conjunction
with the LT1634 micropower shunt reference. The supply
current of the op amp also biases the reference. The drop
across resistor R1 is fixed at 1.2V generating an output
current equal to 1.2V/R1.
The application in Figure 3 utilizes the Over-The-Top
capabilities of the LT1638. The 0.2Ω resistor senses the
load current while the op amp and NPN transistor form a
closed loop making the collector current of Q1
proportional to the load current. As a convenient monitor,
the2kloadresistorconvertsthecurrentintoavoltage.The
positive supply rail, V+, is not limited to the 5V supply of
the op amp and could be as high as 44V.
+
V
200Ω
V
CC
V
CC
R1
LT1634-1.2
5V
0.2Ω
+
Q1
1/2 LT1638
2N3904
+
200Ω
–
1.2V
R1
0V TO 4.3V
1/2 LT1638
I
=
OUT
2k
I
LOAD
LOAD
–
I
OUT
1638/39 F03
V
= (2Ω)(I
)
LOAD
OUT
1638/39 F04
Figure 3. Positive Supply Rail Current Sense
Figure 4. Current Source
W
W
SI PLIFIED SCHE ATIC
+
V
Q2
Q1
Q3
Q22
D1
D2
D3
R1
6k
R2
1k
Q19
Q4
–IN
+IN
Q17
Q18
Q20
OUT
Q7
Q8
Q11 Q12
R3
1k
+
Q16
10μA
Q15
Q9
Q10
Q13
Q14
Q21
R4
8k
R5
8k
Q5
Q6
D4
D5
–
V
ONE AMPLIFIER
1638/39 SS
16389fd
12
LT1638/LT1639
U
PACKAGE DESCRIPTION
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115
0.38 0.10
TYP
5
8
0.675 0.05
3.5 0.05
2.15 0.05 (2 SIDES)
1.65 0.05
3.00 0.10
(4 SIDES)
1.65 0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
PACKAGE
OUTLINE
(DD) DFN 1203
4
1
0.25 0.05
0.75 0.05
0.200 REF
0.25 0.05
0.50 BSC
0.50
BSC
2.38 0.05
(2 SIDES)
2.38 0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
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 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
3.00 0.102
0.52
(.0205)
REF
(.118 .004)
(NOTE 3)
0.889 0.127
(.035 .005)
8
7 6
5
3.00 0.102
(.118 .004)
(NOTE 4)
5.23
(.206)
MIN
4.90 0.152
(.193 .006)
3.20 – 3.45
(.126 – .136)
DETAIL “A”
0° – 6° TYP
0.254
(.010)
GAUGE PLANE
0.65
(.0256)
BSC
0.42 0.038
(.0165 .0015)
TYP
1
2
3
4
0.53 0.152
(.021 .006)
1.10
(.043)
MAX
0.86
(.034)
REF
RECOMMENDED SOLDER PAD LAYOUT
DETAIL “A”
0.18
(.007)
SEATING
PLANE
NOTE:
0.22 – 0.38
(.009 – .015)
TYP
0.127 0.076
(.005 .003)
MSOP (MS8) 0204
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
0.65
(.0256)
BSC
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
16389fd
13
LT1638/LT1639
U
PACKAGE DESCRIPTION
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
1
7
6
5
.130 .005
.045 – .065
.300 – .325
(7.620 – 8.255)
(3.302 0.127)
(1.143 – 1.651)
.255 .015*
(6.477 0.381)
.065
(1.651)
TYP
2
4
3
.008 – .015
(0.203 – 0.381)
.120
.020
(0.508)
MIN
(3.048)
MIN
+.035
–.015
.325
.018 .003
(0.457 0.076)
.100
(2.54)
BSC
+0.889
8.255
(
)
N8 1002
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 .005
.050 BSC
7
5
8
6
.245
.160 .005
MIN
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 .005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
×
45°
.053 – .069
(1.346 – 1.752)
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE
MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL
NOT EXCEED .006" (0.15mm)
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
SO8 0303
16389fd
14
LT1638/LT1639
U
PACKAGE DESCRIPTION
N Package
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.770*
(19.558)
MAX
14
13
12
11
10
9
8
.255 .015*
(6.477 0.381)
1
2
3
5
6
7
4
.300 – .325
(7.620 – 8.255)
.045 – .065
(1.143 – 1.651)
.130 .005
(3.302 0.127)
.020
(0.508)
MIN
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
+.035
.325
.005
(0.127)
MIN
–.015
.120
(3.048)
MIN
.018 .003
.100
(2.54)
BSC
+0.889
8.255
(0.457 0.076)
(
)
–0.381
N14 1103
NOTE:
INCHES
MILLIMETERS
1. DIMENSIONS ARE
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.337 – .344
(8.560 – 8.738)
NOTE 3
.045 .005
.050 BSC
13
12
11
10
8
14
N
9
N
1
.245
MIN
.160 .005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
2
3
N/2
N/2
7
.030 .005
TYP
RECOMMENDED SOLDER PAD LAYOUT
1
2
3
4
5
6
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0° – 8° TYP
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE
MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS
SHALL NOT EXCEED .006" (0.15mm)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
.016 – .050
(0.406 – 1.270)
S14 0502
16389fd
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
15
LT1638/LT1639
U
TYPICAL APPLICATION
The battery monitor in Figure 5 also demonstrates the
LT1638’s ability to operate with its inputs above the
positive rail. In this application, a conventional amplifier
would be limited to a battery voltage between 5V and
ground, but the LT1638 can handle battery voltages as
high as 44V. When the battery is charging, Amp B senses
the voltage drop across RS. The output of Amp B causes
Q2 to drain sufficient current through RB to balance the
input of Amp B. Likewise, Amp A and Q1 form a closed
loopwhenthebatteryisdischarging. Thecurrentthrough
Q1 or Q2 is proportional to the current in RS and this
currentflowsintoRG andisconvertedintoavoltage. Amp
D buffers and amplifies the voltage across RG. Amp C
compares the output of Amp A and Amp B to determine
the polarity of current through RS. The scale factor for
V
OUT withS1openis1V/A. WithS1closedthescalefactor
is 1V/100mA and currents as low as 500μA can be
measured.
R , 0.2Ω
R , 2k
S
A
Q1
2N3904
CHARGER
VOLTAGE
+
A
+
1/4 LT1639
R 2k
A',
I
BATT
C
LOGIC
–
1/4 LT1639
–
R , 2k
B
Q2
2N3904
LOGIC HIGH (5V) = CHARGING
+
LOGIC LOW (0V) = DISCHARGING
B
1/4 LT1639
R , 2k
B'
+
–
+
LOAD
D
R
G
V
OUT
1/4 LT1639
V
BATT
= 12V
10k
–
S1
10k
90.9k
1638/39 F05
V
V
OUT
OUT
(R )(R /R )(GAIN) GAIN
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
R
V
= R
A
S
B
I
=
=
AMPS
BATT
= 5V, 0V
S
G
A
Figure 5. Battery Monitor
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
Input/Output Common Mode Includes Ground, 70μV V
and 2.5μV/°C Drift (Max), 200kHz GBW, 0.07V/μs Slew Rate
LT1078/LT1079
LT2078/LT2079
Dual/Quad 55μA Max, Single Supply, Precision Op Amps
Dual/Quad 17μA Max, Single Supply, Precison Op Amps
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
OS(MAX)
LT1178/LT1179
LT2178/LT2179
Input/Output Common Mode Includes Ground, 70μV V
OS(MAX)
and 4μV/°C Drift (Max), 85kHz GBW, 0.04V/μs Slew Rate
475μV V , 500V/mV A , 400kHz GBW
LT1366/LT1367
LT1490/LT1491
OS(MAX)
VOL(MIN)
Dual/Quad Over-The-Top Micropower, Rail-to-Rail Input and
Output Op Amps
Single Supply Input Range: –0.4V to 44V, Micropower 50μA
per Amplifier, Rail-to-Rail Input and Output, 200kHz GBW
LT1636
Single Over-The-Top Micropower Rail-to-Rail Input and Output
Op Amp
55μA Supply Current, V
Extends 44V above V ,
CM EE
Independent of V ; MSOP Package, Shutdown Function
CC
16389fd
LT 0707 REV D • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
© LINEAR TECHNOLOGY CORPORATION 1998
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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