LT1672CS8 [Linear]
2MMax, AV=>5 SINGLE, DUAL AND QUAD OVER-THE-TOP PRECISION RAIL-TO-RAIL INPUT AND OUTPUT OP AMPS; 2MMax , AV = \u003e 5单,双核和四OVER -THE -TOP精密轨到轨输入和输出运算放大器型号: | LT1672CS8 |
厂家: | Linear |
描述: | 2MMax, AV=>5 SINGLE, DUAL AND QUAD OVER-THE-TOP PRECISION RAIL-TO-RAIL INPUT AND OUTPUT OP AMPS |
文件: | 总12页 (文件大小:207K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1672/LT1673/LT1674
2µA Max, AV ≥ 5 Single, Dual
and Quad Over-The-Top Precision
Rail-to-Rail Input and Output Op Amps
U
FEATURES
DESCRIPTIO
The LT®1672/LT1673/LT1674 are ultralow power
■
Gain of 5 Stable
■
(IS ≤ 2µA) decompensated (AV ≥ 5) op amps with preci-
sion specifications. The extremely low supply current is
combined with excellent amplifier specifications: input
offset voltage is 375µV maximum with a typical drift of
only 0.4µV/°C, input offset current is 100pA maximum. A
minimumopen-loopgain(AVOL)of100V/mVensuresthat
gain errors are small. The devices’ characteristics change
little over the supply range of 2.2V to ±15V. Supply
rejection is 90dB and the common mode rejection ratio is
90dB. Operationisspecifiedfor3V, 5Vand±15Vsupplies.
Reverse battery protection (–18V min) and inputs that
operate above the positive supply make the LT1672/
LT1673/LT1674 easy to use in harsh environments.
Low Supply Current: 2µA Max per Amplifier
■
Rail-to-Rail Input and Output
■
■
■
■
■
■
■
■
■
■
Low Offset Voltage: 375µV Max
Over-The-TopTM Inputs Operate Above V+
Gain Bandwidth Product: 12kHz
Wide Supply Range: 2.2V to 36V
Single Supply Input Range: –0.3V to 36V
Low Input Bias Current: 250pA
Low Input Offset Current: 20pA
High AVOL: 100V/mV Minimum Driving 100kΩ Load
Output Sources and Sinks 500µA Load Current
Reverse Battery Protected to 18V
U
The low bias currents and offset current of the amplifier
permit the use of megohm level source resistors without
introducing significant errors. Voltage noise at 4µVP-P is
remarkably low considering the low supply current. For
unity gain stable versions of these amplifiers, see the
LT1494/LT1495/LT1496.
APPLICATIO S
■
Battery- or Solar-Powered Systems
■
Portable Instrumentation
■
Remote Sensor Amplifier
■
Micropower Filter
Photodiode Amplifier
■
The LT1672 is available in the 8-pin MSOP, PDIP and SO
packages. The LT1673 is available in plastic 8-pin PDIP
and SO-8 packages with the standard dual op amp pinout.
The LT1674 is available in 14-pin PDIP and SO packages.
■
High Impedance Circuits
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
U
TYPICAL APPLICATION
TC VOS Distribution
Single Supply, 60µW Precision Instrumentation Amplifier
80
120 AMPLIFIERS
5V
V
= ±2.5V
S
70
60
50
40
30
20
10
0
100k*
–40°C to 85°C
V
+
IN1
1M
5V
1/2 LT1673
–
110k
1M
100k
100k
–
+
LT1672
V
OUT
1M
1000pF
110k
1M
1M
–
A
= 100
V
5V
BANDWIDTH = 1kHz
1/2 LT1673
CMRR = 65dB AT 120Hz
0.0047µF
LT1389-2.5
–1.5
–0.9
–0.3
0.3
0.9
1.5
100k*
*500V TRANSIENT PROTECTION
TOTAL SUPPLY CURRENT = 12µA
V
IN2
+
TC V (µV/°C)
OS
1672/3/4 TA01
1672/3/4 TA02
1
LT1672/LT1673/LT1674
W W U W
ABSOLUTE AXI U RATI GS
(Note 1)
Total Supply Voltage (V+ to V–) .............................. 36V
Differential Input Voltage ......................................... 36V
Input Current ...................................................... ±10mA
Output Short-Circuit Duration.......................Continuous
Operating Temperature Range (Note 2) .. –40°C to 85°C
Specified Temperature Range (Note 3)... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Junction Temperature........................................... 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
U W
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
TOP VIEW
NC
–IN
+IN
1
2
3
4
8
7
6
5
NC
LT1672CMS8
LT1672IMS8
LT1672CN8
LT1672CS8
LT1672IN8
LT1672IS8
NC 1
–IN 2
8 NC
7 V
6 OUT
5 NC
+
V
+
+IN 3
OUT
NC
–
V
4
–
V
MS8 PACKAGE
8-LEAD PLASTIC MSOP
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
MS8 PART MARKING
S8 PART MARKING
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 250°C/ W
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
LTFH
LTFJ
1672
1672I
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
OUT A
–IN A
+IN A
1
2
3
4
5
6
7
14
13
12
11
10
9
OUT D
–IN D
+IN D
TOP VIEW
+
LT1673CN8
LT1673CS8
LT1673IN8
LT1673IS8
LT1674CN
LT1674CS
LT1674IN
LT1674IS
OUT A
–IN A
+IN A
1
2
3
4
V
8
7
6
5
A
B
D
C
OUT B
–IN B
+IN B
+
–
A
V
V
B
+IN B
–IN B
OUT B
+IN C
–IN C
OUT C
–
V
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
8
S8 PART MARKING
N PACKAGE
14-LEAD PDIP
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/ W (N8)
JMAX = 150°C, θJA = 190°C/ W (S8)
1673
1673I
T
TJMAX = 150°C, θJA = 110°C/ W (N)
JMAX = 150°C, θJA = 150°C/ W (S)
T
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
V = 5V
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
150
200
150
200
375
475
475
575
µV
µV
µV
µV
OS
S
V = 3V
S
V = 5V, MS8 Package
S
V = 3V, MS8 Package
S
I
I
Input Bias Current
(Note 5)
250
180
20
4
1000
360
100
pA
nA
pA
B
V
= 10V (Note 6)
CM
Input Offset Current
Input Noise Voltage
(Note 5)
0.1Hz to 10Hz
OS
µV
P-P
2
LT1672/LT1673/LT1674
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
f = 100Hz
f = 100Hz
MIN
TYP
185
10
500
250
MAX
UNITS
nV/√Hz
fA/√Hz
V/mV
V/mV
e
Input Noise Voltage Density
Input Noise Current Density
Large-Signal Voltage Gain
n
i
n
A
VOL
V = 5V, V = 0.25V to 4.5V, R = 100k
100
50
S
O
L
V = 3V, V = 0.25V to 2.5V, R = 100k
S
O
L
Input Voltage Range
0
36
V
CMRR
PSRR
Common Mode Rejection Ratio
V
V
= 0V to 4V, V = 5V
90
74
90
106
95
99
2.1
50
dB
dB
dB
V
mV
mV
V
V
CM
CM
S
= 0V to 10V, V = 5V
S
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Output Voltage Swing LOW
V = 2.2V to 12V, V = V = 0.5V
S
CM
O
2.2
100
410
V
OL
V
OH
No Load
I
= 100µA
210
V – 0.035
V – 0.160
SINK
+
+
Output Voltage Swing HIGH
No Load
= 100µA
V – 0.07
V – 0.32
+
+
I
SOURCE
I
I
Short-Circuit Current
Supply Current per Amplifier
Reverse Supply Voltage
Slew Rate
(Note 5)
(Note 6)
0.7
1.3
1.5
mA
µA
V
V/ms
kHz
SC
2
S
I = 10µA per Amplifier
–18
1.6
S
SR
GBW
A = –5, V = ±10V
5
12
V
S
Gain Bandwidth Product
f = 100Hz
The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = 5V, 0V; VS = 3V, 0V;
VCM = VO = half supply, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
V = 5V
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
●
●
●
●
175
225
175
225
425
525
525
625
µV
µV
µV
µV
OS
S
V = 3V
S
V = 5V, MS8 Package
S
V = 3V, MS8 Package
S
V
TC
Input Offset Voltage Drift
Input Bias Current
(Note 4)
(Note 5)
●
0.4
250
240
20
280
150
2
µV/°C
OS
I
I
●
●
1200
500
120
pA
nA
pA
V/mV
V/mV
B
V
= 10V (Note 6)
CM
Input Offset Current
Large-Signal Voltage Gain
(Note 5)
V = 5V, V = 0.25V to 4.5V, R = 100k
●
OS
A
●
●
75
40
VOL
S
O
L
V = 3V, V = 0.25V to 2.5V, R = 100k
S
O
L
Input Voltage Range
●
0.2
36
V
CMRR
PSRR
Common Mode Rejection Ratio
V
V
= 0.2V to 4V, V = 5V
●
●
89
64
89
106
85
99
2.3
55
225
V – 0.04
V – 0.18
dB
dB
dB
V
mV
mV
V
V
CM
CM
S
= 0.2V to 10V, V = 5V
S
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Output Voltage Swing LOW
V = 2.4V to 12V, V = V = 0.5V
●
●
S
CM
O
2.4
110
450
V
V
No Load
●
●
OL
OH
I
= 100µA
SINK
+
+
Output Voltage Swing HIGH
No Load
= 100µA
●
●
V – 0.08
V – 0.36
+
+
I
SOURCE
I
I
Short-Circuit Current
Supply Current per Amplifier
(Note 5)
(Note 6)
●
●
0.6
1.1
1.9
mA
µA
SC
2.8
S
3
LT1672/LT1673/LT1674
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C. VS = 5V, 0V; VS = 3V, 0V;
VCM = VO = half supply, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
V = 5V
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
●
●
●
●
200
250
200
250
475
575
575
675
µV
µV
µV
µV
OS
S
V = 3V
S
V = 5V, MS8 Package
S
V = 3V, MS8 Package
S
V
TC
Input Offset Voltage Drift
Input Bias Current
(Note 4)
(Note 5)
●
0.4
250
275
20
215
115
2
µV/°C
OS
I
I
●
●
1700
750
170
pA
nA
pA
V/mV
V/mV
B
V
= 10V (Note 6)
CM
Input Offset Current
Large-Signal Voltage Gain
(Note 5)
V = 5V, V = 0.25V to 4.5V, R = 100k
●
OS
A
●
●
55
30
VOL
S
O
L
V = 3V, V = 0.25V to 2.5V, R = 100k
S
O
L
Input Voltage Range
●
0.2
36
V
CMRR
PSRR
Common Mode Rejection Ratio
V
V
= 0.2V to 4V, V = 5V
●
●
88
62
88
106
75
99
2.6
60
245
V – 0.05
V – 0.19
dB
dB
dB
V
mV
mV
mV
mV
CM
CM
S
= 0.2V to 10V, V = 5V
S
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Output Voltage Swing LOW
V = 2.7V to 12V, V = V = 0.5V
●
●
S
CM
O
2.7
120
490
V
V
No Load
●
●
OL
OH
I
= 100µA
SINK
+
+
Output Voltage Swing HIGH
No Load
= 100µA
●
●
V – 0.10
V – 0.38
+
+
I
SOURCE
I
I
Short-Circuit Current
Supply Current per Amplifier
(Note 5)
(Note 6)
●
●
0.4
0.9
2.1
mA
µA
SC
3.1
S
TA = 25°C, VS = ±15V, VCM = VO = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
200
200
575
675
µV
µV
OS
MS8 Package
I
I
Input Bias Current
Input Offset Current
25
20
1000
100
pA
pA
B
OS
A
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
V = ±10V, R = 100k
100
–15
100
96
360
V/mV
V
dB
dB
V
V
VOL
O
L
21
CMRR
PSRR
V
V
= –15V to 14V
120
120
–14.85
–14.75
CM
V = ±5V to ±15V
S
R = 1M
–14.70
–14.50
OL
L
R = 100k
L
V
Output Voltage Swing HIGH
R = 1M
R = 100k
L
14.78
14.62
14.89
14.81
V
V
OH
L
I
I
Short-Circuit Current
Supply Current per Amplifier
0.7
1.5
1.9
mA
µA
SC
2.8
S
4
LT1672/LT1673/LT1674
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C, VS = ±15V, VCM = VO = 0V,
unless otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
●
●
225
225
625
725
µV
µV
OS
MS8 Package
I
I
A
Input Bias Current
Input Offset Current
●
●
●
●
●
●
250
20
240
1200
120
pA
pA
V/mV
V
dB
dB
B
OS
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
V = ±10V, R = 100k
60
–14.8
98
VOL
O
L
21
CMRR
PSRR
V
V
= –14.8V to 14V
120
120
–14.84
–14.73
CM
V = ±5V to ±15V
94
S
R = 1M
●
●
–14.67
–14.46
V
V
OL
L
R = 100k
L
V
Output Voltage Swing HIGH
R = 1M
R = 100k
L
●
●
14.76
14.58
14.88
14.79
V
mV
OH
L
I
I
Short-Circuit Current
Supply Current per Amplifier
●
●
0.6
1.3
2.4
mA
µA
SC
3.5
S
The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C, VS = ±15V, VCM = VO = 0V,
unless otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
●
●
250
250
675
775
µV
µV
OS
MS8 Package
I
I
A
Input Bias Current
Input Offset Current
●
●
●
●
●
●
250
20
200
1700
170
pA
pA
V/mV
V
dB
dB
B
OS
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
V = ±10V, R = 100k
50
–14.8
96
VOL
O
L
21
CMRR
PSRR
V
V
= –14.8V to 14V
114
120
–14.83
–14.72
CM
V = ±5V to ±15V
92
S
R = 1M
●
●
–14.66
–14.44
V
V
OL
L
R = 100k
L
V
Output Voltage Swing HIGH
R = 1M
R = 100k
L
●
●
14.74
14.54
14.87
14.77
V
V
OH
L
I
I
Short-Circuit Current
Supply Current per Amplifier
●
●
0.4
1.1
2.8
mA
µA
SC
4.2
S
–40°C to 85°C but are not tested or QA sampled at these temperatures.
The LT1672I/LT1673I/LT1674I are guaranteed to meet specified
performance from –40°C to 85°C.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LT1672C/LT1673C/LT1674C and LT1672I/LT1673I/LT1674I
are guaranteed functional over the Operating Temperature Range of –40°C
to 85°C.
Note 4: This parameter is not 100% tested.
Note 5: V = 5V limit guaranteed by correlation to V = 3V and V = ±15V
S
S
S
tests.
Note 3: The LT1672C/LT1673C/LT1674C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1672C/LT1673C/LT1674C are
designed, characterized and expected to meet specified performance from
Note 6: V = 3V limit guaranteed by correlation to V = 5V and V = ±15V
tests.
S
S
S
5
LT1672/LT1673/LT1674
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Input
Supply Current vs Temperature
Minimum Supply Voltage
Offset Voltage
200
20
18
16
14
12
10
8
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= 5V, 0V
S
LT1672/73/74
5600 AMPLIFIERS
150
100
T
T
= 25°C
= –40°C
A
V
S
= ±15V
A
V
S
= ±2.5V
T = 85°C
A
50
0
6
4
2
–50
0
3
1
2
4
5
40
80 100
–40 –20
0
20
60
–300 –200 –100
0
100 400
200 300
–400
TOTAL SUPPLY VOLTAGE (V)
INPUT OFFSET VOLTAGE (µV)
TEMPERATURE (°C)
1672/3/4 G03
1672/3/4 G02
1672/73/74 G01
Output Saturation Voltage
vs Load Current (Output Low)
Input Bias Current
vs Common Mode Voltage
Output Saturation Voltage
vs Load Current (Output High)
1000
100
10
1000
100
10
300
200
100
1.5
V
= 5V, 0V
V
= 5V, 0V
V
= 5V, 0V
S
S
S
T
T
= 85°C
A
A
= 25°C
T
= –40°C
A
T
= 85°C
A
T
= 25°C
A
T
= 85°C
A
T
= –40°C
T
= 25°C
A
A
T
= –40°C
A
T
= 25°C
A
0.5
T
= –40°C
T = 85°C
A
A
–0.5
0.1
1
10
100
1000
0.1
1
10
100
1000
–1
0
1
2
3
4
5
6
7
8
9
10
LOAD CURRENT (µA)
LOAD CURRENT (µA)
COMMON MODE VOLTAGE (V)
1672/3/4 G04
1672/3/4 G05
1672/3/4 G06
Gain and Phase Shift
vs Frequency
Noise Voltage Spectrum
Noise Current Spectrum
90
80
70
120
300
250
200
150
100
50
100
80
V
= ±2.5V
V
= ±2.5V
V
= ±2.5V
S
S
S
100
80
PHASE
60
50
40
30
20
10
0
60
40
60
40
20
0
20
GAIN
0
–20
–40
–60
–80
–10
100
0
1k
10k
1
10
100
1
10
100
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
1672/3/4 G07
1672/3/4 G08
1672/3/4 G09
6
LT1672/LT1673/LT1674
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Gain Bandwidth and Phase
Margin vs Supply Voltage
0.1Hz to 10Hz
Output Voltage Noise
Capacitive Load Handling
80
70
60
50
40
30
16
14
12
10
8
80
MEASURED AT
V
= ±2.5V
V
V
= ±15V
CM
S
S
A
V
= 5
= 0V
70
60
50
40
30
20
10
0
PHASE MARGIN
GBW
A
= 5
V
A
= 10
V
6
0
10
15
20
25
30
10
100
1k
10k
5
TIME (1s/DIV)
SUPPLY VOLTAGE (V)
CAPACITIVE LOAD (pF)
1672/3/4 G10
1672/3/4 G12
1672/3/4 G07
Common Mode Rejection Ratio
vs Frequency
Power Supply Rejection Ratio
vs Frequency
Output Impedance vs Frequency
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
10
1
V
S
= ±2.5V
V
= ±2.5V
V
= ±2.5V
S
S
A
V
= 10
+PSRR
A
V
= 5
–PSRR
0.1
10
100
1k
10k
100
1k
10k 20k
10
100
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
1672/3/4 G14
1672/3/4 G13
1672/3/4 G15
Open-Loop Gain
VS = 5V, 0V
Open-Loop Gain
Warm-Up Drift vs Time
VS = ±15V
40
30
80
60
20
15
10
5
V
= ±15V
V
= 5V, 0V
S
S
20
40
20
V
= ±15V
= ±2.5V
R
= 100k
S
L
10
R
= 1M
L
R
L
= 1M
0
0
–20
–40
–60
0
R
= 100k
L
V
S
–10
–20
–30
– 40
–5
–10
–15
–20
–80
0
20 40 60 80 100 120 140 160 180 200
TIME AFTER POWER-UP (SEC)
1672/3/4 G16
–20 –15 –10 –5
0
5
10 15 20
1
2
4
0
5
6
3
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1672/3/4 G18
1672/3/4 G17
7
LT1672/LT1673/LT1674
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Small-Signal Response
Small-Signal Response
Large-Signal Response
1672/3/4 G19
1672/3/4 G20
1672/3/4 G21
VS = ±15V
CL = 100pF
AV = 5
VS = 5V
CL = 100pF
AV = 5
VS = 5V
C
L = 100pF
AV = 5
W U U
U
APPLICATIO S I FOR ATIO
Start-Up Characteristics
+
+
+
V
V
V
Micropower op amps are sometimes not micropower
during start-up, wreaking havoc on low current supplies.
Intheworstcase,theremaynotbeenoughsupplycurrent
availabletotakethesystemuptonominalvoltages.Figure
1 is a graph of LT1673 supply current vs supply voltage
for the three limit cases of input offset that could occur
during start-up. The circuits are shown in Figure 2. One
circuitcreatesapositiveoffset,forcingtheoutputtocome
up saturated high. Another circuit creates a negative
offset, forcing the output to come up saturated low, while
thelastbringsuptheoutputathalfsupply.Inallcases,the
supply current is well behaved. Supply current is highest
with the output forced high, so if one amplifier is unused,
it is best to force the output low or at half supply.
5
+
–
+
+
–
–
820k
–
–
–
V
OUTPUT HIGH
V
OUTPUT LOW
V
200k
16/2/3/4 F02
OUTPUT AT V /2
S
Figure 2. Circuits for Start-Up Characteristics
Reverse Battery
TheLT1672/LT1673/LT1674areprotectedagainstreverse
battery voltages up to 18V. In the event a reverse battery
condition occurs, the supply current is typically less than
100nA (inputs grounded and outputs open). For typical
single supply applications with ground referred loads and
feedback networks, no other precautions are required. If
the reverse battery condition results in a negative voltage
at either the input pins or output pin, the current into the
pin should be limited by an external resistor to less than
10mA.
4
OUTPUT HIGH
3
OUTPUT LOW
OUTPUT V /2
2
1
0
S
Inputs
While the LT1672/LT1673/LT1674 will function normally
with its inputs taken above the positive supply, the com-
mon mode range does not extend beyond approximately
300mV below the negative supply at room temperature.
0
1
2
3
4
5
TOTAL SUPPLY VOLTAGE (V)
1672/3/4 FO1
Figure 1. Start-Up Characteristics
8
LT1672/LT1673/LT1674
W U U
APPLICATIO S I FOR ATIO
U
Thedevicewillnotbedamagediftheinputsaretakenlower
than 300mV below the negative supply as long as the cur-
rent out of the pin is limited to less than 10mA. However,
theoutputphaseisnotguaranteedandthesupplycurrent
will increase.
and (VCC – 0.8V), Q1 and Q2 are active. When the input
common mode exceeds (VCC – 0.8V), Q7 turns on,
diverting the current from diff amp Q1-Q2 to current
mirror Q8-Q9. The current from Q8 biases on the other
diff amp consisting of PNP’s Q5-Q6 and NPN’s Q3-Q4.
Though Q5-Q6 are driven from the emitters rather than
the base, the basic diff amp action is the same. When the
common mode voltage is between (VCC – 0.8V) and VCC,
devices Q3 and Q4 act as followers, forming a buffer
between the amplifier inputs and the emitters of the Q5-
Q6. If the common mode voltage is taken above VCC,
Schottky diodes D1 and D2 reverse bias and devices Q3
and Q4 then act as diodes. The diff amp formed by Q5-Q6
operates normally, however, the input bias current in-
creases to the emitter current of Q5-Q6, which is typically
180nA. The graph, Input Bias Current vs Common Mode
Voltage found in the Typical Performance Characteristics
section, shows these transitions at three temperatures.
Output
Thegraph,CapacitiveLoadHandling,showsamplifiersta-
bility with the output biased at half supply. If the output is
to be operated within about 100mV of the positive rail, the
allowable load capacitance is less. With this output volt-
age, theworstcaseoccursatAV =5andlightloads, where
the load capacitance should be less than 500pF with a 5V
supply and less than 100pF with a 30V supply.
Rail-to-Rail Operation
The simplified schematic, Figure 3, details the circuit
design approach of the LT1672/LT1673/LT1674. The
amplifier topology is a three-stage design consisting of a
rail-to-rail input stage, that continues to operate with the
inputs above the positive rail, a folded cascode second
stage that develops most of the voltage gain, and a rail-to-
rail common emitter stage that provides the current gain.
Thecollectorcurrentsofthetwo-inputpairsarecombined
in the second stage consisting of Q11 to Q16, which
furnishes most of the voltage gain. Capacitor C1 sets the
amplifier bandwidth. The output stage is configured for
maximum swing by the use of common emitter output
devices Q21 and Q22. Diodes D4 to D6 and current source
Q15 set the output quiescent current.
TheinputstageisformedbytwodiffampsQ1-Q2andQ3-
Q6.ForsignalswithacommonmodevoltagebetweenVEE
D1
D2
D3
D7
Q10
Q13
Q14
Q15
Q20
Q19
+
I
1
Q21
C1
+
–
IN
IN
OUT
+
Q1 Q2
Q3
Q4
Q7
(V ) – 0.8V
Q16
Q17
D4
D5
D6
Q11
Q12
Q5
Q6
Q18
Q22
R1
R2
I
2
Q9
Q8
1672/3/4 F03
Figure 3. Simplified Schematic
9
LT1672/LT1673/LT1674
U
TYPICAL APPLICATIO S
Battery Current Monitor
Over-the-Top Comparator with Hysteresis
I
L
R
SENSE
CHARGE
1M
0.1Ω
5V (V
)
CC
12V
DISCHARGE
5V
10k
IN1
R
R
A
A
+
–
–
+
(0V TO 12V)
–
A2
V
LT1672
1M
A1
1/2 LT1673
OUT
1/2 LT1673
R
R
A
A
1M
+
1M
2N5087
10k
IN2
(0V TO 12V)
2N3904
DISCHARGE
2N3904
CHARGE
R
R
B
A
V
= I
R
SENSE
O
L
(
)
2N5210
OUT
OUT
V
CC
100
HYSTERESIS =
FOR R = 10k, R = 100k (R /R ≥5)
R
R
A
B
B
A
B
B
1672/3/4 TA03
V
I
I
S
< 10µA
O
L
= 1V/A
1672/3/4 TA04
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 ± 0.004*
0.043
(1.10)
MAX
0.034
(0.86)
REF
(3.00 ± 0.102)
8
7
6
5
0.007
(0.18)
0° – 6° TYP
0.118 ± 0.004**
(3.00 ± 0.102)
0.193 ± 0.006
(4.90 ± 0.15)
SEATING
PLANE
0.009 – 0.015
(0.22 – 0.38)
0.021 ± 0.006
(0.53 ± 0.015)
0.005 ± 0.002
(0.13 ± 0.05)
0.0256
(0.65)
BSC
MSOP (MS8) 1100
1
2
3
4
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
8
7
6
5
4
0.065
(1.651)
TYP
0.255 ± 0.015*
(6.477 ± 0.381)
0.009 – 0.015
(0.229 – 0.381)
0.125
0.020
(0.508)
MIN
(3.175)
MIN
+0.035
–0.015
1
2
3
0.325
0.018 ± 0.003
0.100
(2.54)
BSC
+0.889
8.255
(0.457 ± 0.076)
(
)
N8 1098
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
10
LT1672/LT1673/LT1674
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
7
5
8
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
3
4
2
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
TYP
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
SO8 1298
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
13
12
11
10
8
14
9
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
1
2
3
4
5
6
7
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0° – 8° TYP
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
TYP
0.016 – 0.050
(0.406 – 1.270)
S14 1298
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
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.
11
LT1672/LT1673/LT1674
U
TYPICAL APPLICATIO
Micropower Photodiode Amplifier
C1
20pF
R1
10M
V
OUT
PHOTODIODE
GAIN: A = 10MΩ =
Z
I
10% TO 90% RISE TIME: t = 260µs
r
+
V
S
BANDWIDTH: BW = 1.7kHz
I
PHOTODIODE
–
+
880nm IR
PHOTODIODE
V
LT1672
–
OUT
C
D
λ
170pF
OPTO-DIODE CORP
ODD-45W
V
= ±1.2V TO ±15V
S
V
S
C1, CD SATISFY GAIN OF 5
STABILITY REQUIREMENT AT AC.
1672/3/4 TA05
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC®1440/41/42
Micropower Single/Dual Comparators with 1% Reference LTC1440: Single, LTC1441/42: Dual
LTC1443/LTC1444/LTC1445 Micropower Quad Comparators with 1% Reference
LTC1443: 1.182 Reference
LTC1444/45: 1.221V Reference and Adjustable Hysteresis
LT1466/LT1467
75µA Dual/Quad Rail-to-Rail Input and Output Op Amps
50µA Dual/Quad Rail-to-Rail Input and Output Op Amps
390µV V
950µV V
, Gain Bandwidth = 120kHz
, Gain Bandwidth = 200kHz
OS(MAX)
LT1490A/LT1491A
LT1494/LT1495/LT1496
OS(MAX)
1.5µA Max Single/Dual/Quad Over-the-Top
Unity Gain Stable Version of the LT1672/LT1673/LT1674
Precision Rail-to-Rail Input and Output Op Amps
LTC1540
LT1636
Nanopower Single Comparator with 1% Reference
350nA Supply Current
Single Over-the-Top Micropower, Rail-to-Rail
Input and Output Op Amp
225µV V , I = 55µA (Max), Gain Bandwidth = 200kHz,
OS(MAX) S
Shutdown Pin, MSOP
LT2078/LT2079
LT2178/LT2179
LT1782
55µA Dual/Quad Single Supply Op Amps
17µA Dual/Quad Single Supply Op Amps
120µV V
120µV V
, Gain Bandwidth = 200kHz
, Gain Bandwidth = 60kHz
OS(MAX)
OS(MAX)
Micropower, Over-The-Top, SOT-23, Rail-to-Rail
Input and Output Op Amp
SOT-23, 800µV V
Gain-Bandwidth = 200kHz, Shutdown Pin
, I = 55µA (Max),
OS(MAX) S
LT1783
1.2MHz, Over-The-Top, Micropower, Rail-to-Rail
Input and Output Op Amp in SOT-23
SOT-23, 800µV V , I = 300µA (Max),
Gain-Bandwidth = 1.2MHz, Shutdown Pin
OS(MAX)
S
167234f LT/TP 0101 4K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
LINEAR TECHNOLOGY CORPORATION 2001
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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