LT1881CN8#TRPBF [Linear]
IC DUAL OP-AMP, 125 uV OFFSET-MAX, 0.85 MHz BAND WIDTH, PDIP8, 0.300 INCH, PLASTIC, DIP-8, Operational Amplifier;
| 型号： | LT1881CN8#TRPBF |
| 厂家： | 
Linear |
| 描述： | IC DUAL OP-AMP, 125 uV OFFSET-MAX, 0.85 MHz BAND WIDTH, PDIP8, 0.300 INCH, PLASTIC, DIP-8, Operational Amplifier 放大器 光电二极管 |
| 文件： | 总18页 (文件大小：302K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1881/LT1882
Dual and Quad
Rail-to-Rail Output, Picoamp
Input Precision Op Amps
DESCRIPTION
FEATURES
The LT®1881 and LT1882 op amps bring high accuracy
input performance to amplifiers with rail-to-rail output
swing. Input bias currents and capacitive load driving
capabilities are superior to the similar LT1884 and LT1885
amplifiers, at the cost of a slight loss in speed. Input
offset voltage is trimmed to less than 50μV and the
low drift maintains this accuracy over the operating
temperature range. Input bias currents are an ultralow
200pA maximum.
n
Offset Voltage: 50μV Maximum (LT1881A)
n
Input Bias Current: 200pA Maximum (LT1881A)
n
Offset Voltage Drift: 0.8μV/°C Maximum
n
Rail-to-Rail Output Swing
Supply Range: 2.7V to 36V
n
n
Operates with Single or Split Supplies
n
Open-Loop Voltage Gain: 1 Million Minimum
n
1mA Maximum Supply Current Per Amplifier
n
Stable at A = 1, C = 1000pF
V
L
n
n
Standard Pinouts
The amplifiers work on any total power supply voltage
between 2.7V and 36V (fully specified from 5V to 15Vꢀ.
Output voltage swings to within 40mV of the negative
supply and 220mV of the positive supply make these
amplifiers good choices for low voltage single supply
operation.
Wide Operating Temperature Range:
–55°C to 125°C (LT1882ꢀ
APPLICATIONS
n
Thermocouple Amplifiers
n
Capacitive loads up to 1000pF can be driven directly in
unity-gain follower applications.
Bridge Transducer Conditioners
n
Instrumentation Amplifiers
n
Battery-Powered Systems
The dual LT1881 and LT1881A are available with standard
pinouts in S8 and PDIP packages. The quad LT1882 is in a
14-pin SO package. For a higher speed device with similar
DC specifications, see the LT1884/LT1885.
n
Photo Current Amplifiers
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
16-Bit Voltage Output DAC on 5V Supply
TC VOS Distribution, Industrial Grade
5V
26
V
S
= 15V
24
22
20
18
16
14
12
10
8
5V
40 N8 (1 LOTꢀ
144 S8 (2 LOTSꢀ
184 TOTAL PARTS
1.65k
+
LT1881
–
LT1634
4.096V
–5V
6
R1
R
REF
R
OFS
4
COM
2
33pF
0
5V
LT1881
–5V
1
–0.9–0.8–0.7–0.6–0.5–0.4–0.3–0.2–0.1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
INPUT OFFSET VOLTAGE DRIFT (μV/°Cꢀ
DAC
–
+
V
OUT
18812 TA01b
–4.096V
TO 4.096V
LTC®1597
18812 TA01a
18812fb
1
LT1881/LT1882
(Note 1)
ABSOLUTE MAXIMUM RATINGS
+
–
Supply Voltage (V to V ꢀ.........................................40V
Specified Temperature Range (Note 5ꢀ
Differential Input Voltage (Note 2ꢀ........................... 10V
LT1881C/LT1882C................................–40°C to 85°C
LT1881I/LT1882I..................................–40°C to 85°C
LT1882H ............................................–40°C to 125°C
LT1882MP..........................................–55°C to 125°C
Maximum Junction Temperature........................... 150°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 secꢀ .................. 300°C
+
–
Input Voltage..................................................... V to V
Input Current (Note 2ꢀ.......................................... 10mA
Output Short-Circuit Duration (Note 3ꢀ ............ Indefinite
Operating Temperature Range (Note 4ꢀ
LT1881C/LT1882C................................–40°C to 85°C
LT1881I/LT1882I..................................–40°C to 85°C
LT1882H ............................................–40°C to 125°C
LT1882MP..........................................–55°C to 125°C
PIN CONFIGURATION
TOP VIEW
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
+
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
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
T
= 150°C, θ = 130°C/W (N8ꢀ
JA
= 150°C, θ = 190°C/W (S8ꢀ
JA
JMAX
S PACKAGE
14-LEAD PLASTIC SO
T
JMAX
T
JMAX
= 150°C, θ = 160°C/W
JA
ORDER INFORMATION
LEAD FREE FINISH
LT1881CN8#PBF
LT1881IN8#PBF
LT1881CS8#PBF
LT1881IS8#PBF
LT1881ACN8#PBF
LT1881AIN8#PBF
LT1881ACS8#PBF
LT1881AIS8#PBF
LT1882CS#PBF
LT1882IS#PBF
TAPE AND REEL
PART MARKING
LT1881CN8
LT1881IN8
1881
PACKAGE DESCRIPTION
8-Lead PDIP
SPECIFIED TEMPERATURE RANGE
LT1881CN8#TRPBF
LT1881IN8#TRPBF
LT1881CS8#TRPBF
LT1881IS8#TRPBF
LT1881ACN8#TRPBF
LT1881AIN8#TRPBF
LT1881ACS8#TRPBF
LT1881AIS8#TRPBF
LT1882CS#TRPBF
LT1882IS#TRPBF
LT1882HS#TRPBF
LT1882MPS#TRPBF
0°C to 70°C
8-Lead PDIP
–40°C to 85°C
0°C to 70°C
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead PDIP
1881I
–40°C to 85°C
0°C to 70°C
LT1881ACN8
LT1881AIN8
1881A
8-Lead PDIP
–40°C to 85°C
0°C to 70°C
8-Lead Plastic SO
8-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
1881AI
–40°C to 85°C
0°C to 70°C
LT1882CS
LT1882IS
LT1882HS
LT1882MPS
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
LT1882HS#PBF
LT1882MPS#PBF
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
18812fb
2
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Single supply operation VS = 5V, 0V; VCM = VS/2 unless otherwise noted.
(Note 5)
C/I Grades
TYP
H/MP Grades
SYMBOL PARAMETER
CONDITIONS
0°C < T < 70°C
MIN
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage (LT1881Aꢀ
25
50
85
110
μV
μV
μV
l
l
A
–40°C < T < 85°C
A
Input Offset Voltage (LT1881/LT1882ꢀ
30
80
125
150
30
80
μV
μV
μV
μV
μV
l
l
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
–40°C < T < 125°C
300
300
A
–55°C < T < 125°C
A
l
l
l
l
Input Offset Voltage Drift
(Note 6ꢀ
0°C < T < 70°C
0.3
0.3
0.8
0.8
μV/°C
μV/°C
μV/°C
μV/°C
ΔV /ΔT
OS
A
–40°C < T < 85°C
A
–40°C < T < 125°C
0.3
0.3
0.8
0.8
A
–55°C < T < 125°C
A
Long-Term Input Offset
Voltage Stability
0.3
0.3
μV/month
ΔV
/
OS
ΔTIME
I
Input Offset Current (LT1881Aꢀ
100
200
250
300
pA
pA
pA
OS
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
Input Offset Current (LT1881/LT1882ꢀ
150
500
600
700
150
500
pA
pA
pA
pA
pA
l
l
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
–40°C < T < 125°C
2000
2000
A
–55°C < T < 125°C
A
I
B
Input Bias Current (LT1881Aꢀ
100
150
200
250
300
pA
pA
pA
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
Input Bias Current (LT1881/LT1882ꢀ
500
600
700
150
500
pA
pA
pA
pA
pA
l
l
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
–40°C < T < 125°C
3000
3000
A
–55°C < T < 125°C
A
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
0.5
14
0.5
14
μV
P-P
e
n
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
nV/√Hz
pA/√Hz
i
n
f = 1kHz
0.03
0.03
l
l
R
IN
Differential Mode
Common Mode
20
100
20
100
MΩ
GΩ
l
l
l
C
V
Input Capacitance
2
2
pF
IN
–
–
Input Voltage Range
V + 1.0
V+ – 1.0 V + 1.0
V+ – 1.0
V+ – 1.2
V
V
CM
–
–
V + 1.2
V+ – 1.2 V + 1.2
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
1V < V < 4V
106
104
128
2.4
106
102
128
dB
dB
CM
1.2V < V < 3.8V
CM
–
V
= 0V, V = 1.5V
CM
+
l
l
0°C < T < 85°C, 2.7V < V < 32V
106
106
dB
dB
dB
dB
A
+
0°C < T < 125°C, 2.7V < V < 32V
106
A
+
T = –40°C, 3V < V < 32V
A
+
T = –55°C, 3V < V < 32V
A
106
2.7
l
Minimum Operating Supply Voltage
2.4
2.7
V
18812fb
3
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Single supply operation VS = 5V, 0V; VCM = VS/2 unless otherwise noted.
(Note 5)
C/I Grades
TYP
H/MP Grades
SYMBOL PARAMETER
CONDITIONS
R = 10k; 1V < V < 4V
OUT
MIN
MAX
MIN
TYP
MAX
UNITS
A
Large-Signal Voltage Gain
500
350
1600
500
300
1600
V/mV
V/mV
VOL
L
l
l
l
R = 2k; 1V < V
< 4V
300
250
800
400
300
200
800
400
V/mV
V/mV
L
OUT
R = 1k; 1V < V
< 4V
250
200
250
150
V/mV
V/mV
L
OUT
l
l
l
l
V
V
Output Voltage Swing Low
Output Voltage Swing High
No Load
20
25
70
40
50
150
600
20
25
70
50
60
200
750
mV
mV
mV
mV
OL
I
I
I
= 100μA
= 1mA
= 5mA
SINK
SINK
SINK
270
270
l
l
l
l
No Load
120
130
180
360
220
230
300
600
120
130
180
360
300
325
450
800
mV
mV
mV
mV
OH
+
(Referred to V ꢀ
I
I
I
= 100μA
= 1mA
= 5mA
SINK
SINK
SINK
I
S
Supply Current Per Amplifier
V = 3V, 0V
0.45
0.5
0.65
0.65
0.70
0.85
1.2
0.45
0.5
0.65
0.65
0.70
0.85
1.5
mA
mA
S
l
l
l
V = 5V, 0V
S
0.9
1.4
0.9
1.7
mA
mA
V = 12V, 0V
S
0.5
1.0
1.5
0.5
1.0
1.8
mA
mA
l
l
I
SC
Short-Circuit Current
V
OUT
V
OUT
Short to GND
Short to V
15
15
30
30
10
10
30
30
mA
mA
+
GBW
Gain Bandwidth Product
Channel Separation
Settling Time
f = 20kHz
f = 1kHz
0.35
1.0
120
30
0.35
1.0
120
30
MHz
dB
t
0.01%, V
= 1.5V to 3.5V,
OUT
μs
S
A = –1, R = 2k
V
L
+
–
SR
SR
Slew Rate Positive
Slew Rate Negative
Full-Power Bandwidth
A = –1
0.15
0.12
0.35
0.18
14
0.15
0.1
0.35
0.18
14
V/μs
V/μs
V
l
l
l
A = –1
V
0.11
0.08
0.11
0.06
V/μs
V/μs
FPBW
ΔV
V
= 4V
8.75
6.35
8.75
4.75
kHz
kHz
OUT
P-P
(Note 10ꢀ
Offset Voltage Match
(LT1881Aꢀ
(Note 7ꢀ
30
70
125
160
μV
μV
μV
OS
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
Offset Voltage Match
(LT1881/LT1882ꢀ
(Note 7ꢀ
35
125
175
235
35
125
μV
μV
μV
μV
μV
l
l
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
–40°C < T < 125°C
–55°C < T < 125°C
A
385
385
A
A
l
Offset Voltage Match Drift
(Notes 6, 7ꢀ
0.4
1.2
0.4
1.2
μV/°C
Noninverting Bias Current Match
(LT1881Aꢀ
(Note 7ꢀ
200
300
400
500
pA
pA
pA
ΔI +
B
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
18812fb
4
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Single supply operation VS = 5V, 0V; VCM = VS/2 unless otherwise noted.
(Note 5)
C/I Grades
TYP
H/MP Grades
SYMBOL PARAMETER
CONDITIONS
MIN
MAX
MIN
TYP
MAX
UNITS
Noninverting Bias Current Match
(LT1881/LT1882ꢀ
(Note 7ꢀ
250
700
900
1000
250
700
pA
pA
pA
pA
pA
ΔI +
B
l
l
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
–40°C < T < 125°C
–55°C < T < 125°C
A
2000
2000
A
A
l
Common Mode Rejection Ratio
Match
(Notes 7, 9ꢀ
102
125
100
125
dB
ΔCMRR
ΔPSRR
–
Power Supply Rejection Match
(Notes 7, 9ꢀ
V = 0V, V = 1.5V
CM
+
l
l
0°C < T < 85°C, 2.7V < V < 32V
104
104
126
126
dB
dB
dB
dB
A
+
0°C < T < 125°C, 2.7V < V < 32V
102
102
126
126
A
+
T = –40°C, 3V < V < 32V
A
+
T = –55°C, 3V < V < 32V
A
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Split supply operation VS = 15V, VCM = 0V unless otherwise noted. (Note 5)
C/I Grades
TYP
H/MP Grades
SYMBOL
PARAMETER
CONDITIONS
0°C < T < 70°C
MIN
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(LT1881Aꢀ
25
50
85
110
μV
μV
μV
l
l
A
–40°C < T < 85°C
A
Input Offset Voltage
(LT1881/LT1882ꢀ
30
80
125
150
30
80
μV
μV
μV
μV
μV
l
l
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
–40°C < T < 125°C
300
300
A
–55°C < T < 125°C
A
l
l
l
l
Input Offset Voltage Drift
(Note 6ꢀ
0°C < T < 70°C
0.3
0.3
0.8
0.8
μV/°C
μV/°C
μV/°C
μV/°C
ΔV /ΔT
OS
A
–40°C < T < 85°C
A
–40°C < T < 125°C
0.3
0.3
0.8
0.8
A
–55°C < T < 125°C
A
Long-Term Input Offset
Voltage Stability
0.3
0.3
μV/month
ΔV
/
OS
ΔTIME
I
Input Offset Current (LT1881Aꢀ
100
200
250
300
pA
pA
pA
OS
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
Input Offset Current
(LT1881/LT1882ꢀ
150
500
600
700
150
500
pA
pA
pA
pA
pA
l
l
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
–40°C < T < 125°C
2000
2000
A
–55°C < T < 125°C
A
I
Input Bias Current (LT1881Aꢀ
100
150
200
250
300
pA
pA
pA
B
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
Input Bias Current
(LT1881/LT1882ꢀ
500
600
700
150
500
pA
pA
pA
pA
pA
l
l
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
–40°C < T < 125°C
3000
3000
A
–55°C < T < 125°C
A
18812fb
5
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Split supply operation VS = 15V, VCM = 0V unless otherwise noted.
(Note 5)
C/I Grades
TYP
H/MP Grades
SYMBOL
PARAMETER
CONDITIONS
0.1Hz to 10Hz
f = 1kHz
MIN
MAX
MIN
TYP
0.5
MAX
UNITS
μV
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
0.5
P-P
e
n
14
14
nV/√Hz
pA/√Hz
i
n
f = 1kHz
0.03
0.03
l
l
R
IN
Differential Mode
Common Mode
20
100
20
100
MΩ
GΩ
l
C
V
Input Capacitance
2
2
pF
IN
–
+
–
+
Input Voltage Range
V + 1.0
V – 1.0 V + 1.0
V – 1.0
V
V
CM
–
+
–
+
l
l
l
V + 1.2
V – 1.2 V + 1.2
V – 1.2
CMRR
Common Mode Rejection Ratio
–13.5V < V < 13.5V
114
110
130
132
110
108
130
132
dB
dB
CM
–
+PSRR
Positive Power Supply
Rejection Ratio
V = –15V, V = 0V;
CM
+
1.5V < V < 18V
+
l
l
–PSRR
Negative Power Supply
Rejection Ratio
V = 15V, V = 0V;
106
132
1.2
104
132
1.2
dB
V
CM
–
–1.5V < V < –18V
Minimum Operating
Supply Voltage
1.35
1.35
A
VOL
Large-Signal Voltage Gain
R = 10k; –13.5V < V < 13.5V
OUT
1000 1600
700
1000 1600
500
V/mV
V/mV
L
l
l
l
R = 2k; –13.5V < V
< 4V
175
125
420
175
110
420
V/mV
V/mV
L
OUT
R = 1k; 1V < V
< 4V
90
65
230
90
7
230
V/mV
V/mV
L
OUT
l
l
l
l
V
V
Output Voltage Swing Low
No Load
20
25
70
40
50
150
600
20
25
70
50
60
200
750
mV
mV
mV
mV
OL
(Referred to V
ꢀ
EE
I
I
I
= 100μA
= 1mA
= 5mA
SINK
SINK
SINK
270
270
l
l
l
l
Output Voltage Swing High
(Referred to V
No Load
120
130
180
360
220
230
300
600
120
130
180
360
300
325
450
800
mV
mV
mV
mV
OH
ꢀ
CC
I
I
I
= 100μA
= 1mA
= 5mA
SOURCE
SOURCE
SOURCE
I
I
Supply Current Per Amplifier
Short-Circuit Current
V = 15V
0.5
0.85
1.1
1.6
0.5
0.85
1.1
2.0
mA
mA
S
S
l
l
l
–
+
V
V
Short to V
Short to V
20
15
40
40
20
10
40
40
mA
mA
SC
OUT
20
15
30
30
20
10
30
30
mA
mA
OUT
GBW
Gain Bandwidth Product
Channel Separation
Settling Time
f = 20kHz
f = 1kHz
0.4
0.85
120
30
0.4
0.85
120
30
MHz
dB
t
0.01%, V
= –5V to 5V,
OUT
μs
S
A = –1, R = 2k
V
L
+
–
SR
SR
Slew Rate Positive
Slew Rate Negative
A = –1
0.21
0.18
0.4
0.21
0.15
0.4
V/μs
V/μs
V
l
l
A = –1
V
0.13 0.20
0.1
0.11
0.07
0.20
V/μs
V/μs
18812fb
6
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Split supply operation VS = 15V, VCM = 0V unless otherwise noted.
(Note 5)
C/I Grades
TYP
H/MP Grades
SYMBOL
PARAMETER
CONDITIONS
= 28V
(Note 10ꢀ
MIN
MAX
MIN
TYP
MAX
UNITS
FPBW
Full-Power Bandwidth
V
1.47 2.25
1.13
1.47
0.79
2.25
kHz
kHz
OUT
P-P
l
Offset Voltage Match
(LT1881Aꢀ
(Note 7ꢀ
35
70
125
160
μV
μV
μV
ΔV
OS
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
A
Offset Voltage Match
(LT1881/LT1882ꢀ
(Note 7ꢀ
42
125
175
235
42
125
μV
μV
μV
μV
μV
l
l
l
l
0°C < T < 70°C
A
–40°C < T < 85°C
–40°C < T < 125°C
–55°C < T < 125°C
A
435
435
A
A
l
Offset Voltage Match Drift
(Notes 6, 7ꢀ
0.4
1.1
0.4
1.1
μV/°C
Noninverting Bias Current Match (Note 7ꢀ
(LT1881Aꢀ 0°C < T < 70°C
200
300
400
500
pA
pA
pA
ΔI +
B
l
l
A
–40°C < T < 85°C
A
Noninverting Bias Current Match (Note 7ꢀ
250
700
900
1000
250
700
pA
pA
pA
pA
pA
ΔI +
B
l
l
l
l
(LT1881/LT1882ꢀ
0°C < T < 70°C
–40°C < T < 85°C
A
A
–40°C < T < 125°C
–55°C < T < 125°C
2000
2000
A
A
l
l
l
Common Mode Rejection Match
(Notes 7, 9ꢀ
110
108
104
125
130
130
106
108
104
125
130
130
dB
dB
dB
ΔCMRR
Δ+PSRR
Δ–PSRR
–
Positive Power Supply
Rejection Ratio Match
V = –15V, V = 0V,
CM
+
1.5V < V < 18V, (Notes 7, 9ꢀ
+
Negative Power Supply
Rejection Ratio Match
V = 15V, V = 0V,
CM
–
–1.5V < V < –18V, (Notes 7, 9ꢀ
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 6: This parameter is not 100% tested.
Note 7: Matching parameters are the difference between amplifiers
A and B in the LT1881; and between amplifiers A and D and B and C in the
LT1882.
Note 2: The inputs are protected by internal resistors and back-to-back
diodes. If the differential input voltage exceeds 0.7V, the input current
should be limited externally to less than 10mA.
Note 3: A heat sink may be required to keep the junction temperature
below absolute maximum.
Note 8: This parameter is the difference between the two noninverting
input bias currents.
Note 9: ΔCMRR and ΔPSRR are defined as follows: CMRR and PSRR are
measured in μV/V on each amplifier. The difference is calculated in μV/V
and then converted to dB.
Note 4: The LT1881C/LT1882C and LT1881I/LT1882I are guaranteed
functional over the operating temperature range of –40°C to 85°C.
The LT1882H is guaranteed functional over the operating temperature
range –40°C to 125°C. The LT1882MP is guaranteed functional over the
operating temperature range –55°C to 125°C.
Note 10: Full power bandwidth is calculated from the slew rate: FPBW =
SR/2πV
P.
Note 5: The LT1881C/LT1882C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1881C/LT1882C are designed,
characterized and expected to meet specified performance from –40°C
to 85°C but are not tested or QA sampled at these temperatures. The
LT1881I/LT1882I are guaranteed to meet specified performance from
–40°C to 85°C. The LT1882H is guaranteed to meet specified performance
from –40°C to 125°C. The LT1882MP is guaranteed to meet specified
performance from –55°C to 125°C.
18812fb
7
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current per Amplifier
vs Supply Voltage
Slew Rate vs Supply Voltage
Slew Rate vs Temperature
1200
1000
800
600
400
200
0
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0.5
0.4
0.3
0.2
0.1
0
A
= –1
A
= –1
V
V
V
V
=
=
15V
5V
S
S
RISING
RISING
125°C
25°C
V
V
=
=
15V
5V
S
S
FALLING
FALLING
–55°C
0
4
8
12 16 20 24 28 32 36
0
4
8
12 16 20 24 28 32 36
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°Cꢀ
18812 G03
TOTAL SUPPLY VOLTAGE (Vꢀ
TOTAL SUPPLY VOLTAGE (Vꢀ
18812 G01
18812 G02
Gain Bandwidth Product
vs Supply Voltage
Settling Time vs Output Step
Settling Time vs Output Step
10
8
900
850
800
750
700
650
600
10
8
V
A
=
15V
V
A
=
= 1
15V
S
V
S
V
= –1
6
6
125°C
4
4
0.1%
0.01%
0.1%
0.01%
2
2
25°C
0
0
–55°C
–2
–4
–6
–8
–10
–2
–4
–6
–8
–10
0.1%
0.01%
0.1%
0.01%
0
5
10 15 20 25 30 35 40 45 50 55 60 65
SETTLING TIME (μsꢀ
0
4
8
12 16 20 24 28 32 36
0
5
10 15 20 25 30 35 40 45 50 55 60 65
SETTLING TIME (μsꢀ
TOTAL SUPPLY VOLTAGE (Vꢀ
18812 G04
18812 G06
18812 G05
Phase Margin vs Supply Voltage
Gain vs Frequency, AV = –1
Gain vs Frequency, AV = 1
60
58
56
54
52
50
48
46
10
0
10
0
–55°C
–10
–20
–30
–40
–10
–20
–30
–40
125°C
125°C
V
S
=
2.5V
V
S
=
15V
V
S
=
2.5V
V = 15V
S
0
4
8
12 16 20 24 28 32 36
1k
10k
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
TOTAL SUPPLY VOLTAGE (Vꢀ
FREQUENCY (Hzꢀ
FREQUENCY (Hzꢀ
18812 G07
18812 G09
18812 G08
18812fb
8
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
Gain vs Frequency with CLOAD
,
Gain vs Frequency with CLOAD
,
AV = 1
AV = –1
10
0
10
0
V
S
= 15V
V
S
= 15V
1500pF
1000pF
500pF
1800pF
1000pF
500pF
0pF
–10
–20
–30
–40
–10
–20
–30
–40
0pF
1k
10k
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
FREQUENCY (Hzꢀ
FREQUENCY (Hzꢀ
18812 G10
18812 G11
Small Signal Response, AV = –1,
No Load
Large Signal Response, AV = –1
Large Signal Response, AV = 1
18812 G13
18812 G14
18812 G12
TIME (50μs/DIVꢀ
TIME (2μs/DIVꢀ
TIME (50μs/DIVꢀ
Small Signal Response, AV = –1,
CL = 1000pF
Small Signal Response, AV = 1,
RL = 2k
Small Signal Response, AV = 1,
CL = 500pF
18812 G15
18812 G16
18812 G17
TIME (2μs/DIVꢀ
TIME (2μs/DIVꢀ
TIME (2μs/DIVꢀ
18812fb
9
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
VOS Distribution, TA = 25°C
Voltage Offset vs Temperature
Warm-Up Drift vs Time
5
0
26
24
22
20
18
16
14
12
10
8
200
150
100
50
V
= 15V
V
S
= 15V
S
40 N8 (1 LOTꢀ
144 S8 (2 LOTSꢀ
184 TOTAL PARTS
–5
–10
–15
–20
–25
–30
0
–50
–100
–150
–200
N8 V
=
15V
S8 V = 5V, 15V
S
S
6
4
2
0
0
20
40
60
80 100 120 140
–60 –40 –20
0
20
40
60
–55 –35 –15
5
25 45 65 85 105 125
TIME AFTER POWER UP (sꢀ
OUTPUT OFFSET VOLTAGE (μVꢀ
TEMPERATURE (°Cꢀ
18812 G20
18812 G18
18812 G19
Input Bias Current
vs Common Mode Voltage
Input Common Mode Range
vs Supply Voltage
Input Bias Current vs Temperature
+
1400
1200
1000
800
600
400
200
0
V – 0
1000
800
600
400
200
0
$V ≤ 1mV
OS
V
S
= 15V
V
S
= 15V
+
+
+
+
V
V
V
V
– 0.2
– 0.4
– 0.6
– 0.8
–
–
–
–
V
V
V
V
+ 0.8
+ 0.6
+ 0.4
200
400
600
800
1000
–I
BIAS
+I
BIAS
–55°C
–40°C
25°C
85°C
125°C
+ 0.2
–
V
+ 0
–200
0
2
4
6
8
10 12 14 16
–55 –35 –15
5
25 45 65 85 105 125
–20 –15 –10 –5
0
5
10 15 20
SUPPLY VOLTAGE ( Vꢀ
TEMPERATURE (°Cꢀ
V
CM
(Vꢀ
18812 G23
18812 G22
18812 G21
Input Common Mode Range
vs Temperature
Output Voltage Swing
vs Supply Voltage
Output Saturation Voltage
vs Load Current (Output High)
+
1
5
4
V
– 0
V
V
= 15V
OVERDRIVE
S
R
R
= 10k
L
= 30mV
UPPER LIMIT
V
S
=
5V
+
+
V
V
– 0.5
– 1.0
3
$V <1mV
OS
= 2k
L
2
1
A
= –1
= 25°C
V
A
0.1
0
T
–1
–2
–3
–4
–5
–
–
V
V
+ 1.0
T
T
T
T
T
= –55°C
= –40°C
= 25°C
A
A
A
A
A
R
R
= 2k
L
+ 0.5
–
LOWER LIMIT
= 85°C
= 10k
L
= 125°C
V
+ 0
0.01
0.001
–55 –35 –15
5
25 45 65 85 105 125
0
2
4
6
8
10 12 14 16 18 20
0.01
0.1
1
10
SOURCING LOAD CURRENT (mAꢀ
TEMPERATURE (°Cꢀ
SUPPLY VOLTAGE ( Vꢀ
18812 G26
18812 G24
18812 G25
18812fb
10
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
Output Saturation Voltage
vs Load Current (Output Low)
Output Short-Circuit Current
vs Temperature
Output Voltage
vs Large Input Voltage
10
1
60
56
52
48
44
40
36
32
28
24
20
16
12
8
V
V
= 15V
OVERDRIVE
S
= 30mV
GND
V
IN
SINKING
0.1
V
GND
OUT
SOURCING
T
T
T
T
T
= –55°C
= –40°C
= 25°C
A
A
A
A
A
0.01
0.001
18812 G29
= 85°C
A
V
V
= 1
=
V
S
4
= 125°C
2.5V
5V
0
=
IN
–55 –35 –15
5
25 45 65 85 105 125
0.001
0.01
0.1
1
10
R
= 10k
IN
TEMPERATURE (°Cꢀ
SINKING LOAD CURRENT (mAꢀ
18812 G27
18812 G28
Open-Loop Gain and Phase
vs Frequency
Open-Loop Gain vs Frequency
Channel Separation vs Frequency
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
–10
–20
70
60
175
150
120
100
75
–20
–40
–60
–80
V
S
= 15V
V
= 5V
V
A
=
15V
S
S
V
= 10
50
40
30
PHASE
20
50
10
25
LOOP GAIN
–100
–120
–140
0
0
–10
–20
–30
–25
–50
–100
0.1
1
10 100 1k 10k 100k 1M 10M100M
10 100 1k 10k 100k 1M 10M 100M
1k
10k
100k
FREQUENCY (Hzꢀ
1M
10M
FREQUENCY (Hzꢀ
FREQUENCY (Hzꢀ
18812 G31
18812 G30
18812 G32
Gain Bandwidth Product
vs Temperature
Output Impedance vs Frequency
PSRR vs Frequency
680
660
640
620
600
580
560
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
–10
100
10
V
S
= 15V
V
S
=
2.5V
V = 15V
S
A
V
= 100
1
–PSSR
A
V
= 10
+PSSR
A
V
= 1
0.1
V
S
= 2.5V
0.01
0.001
–55 –35 –15
5
25 45 65 85 105 125
1
10
100
1k
10k 100k
1M
100
1k
10k
100k
FREQUENCY (Hzꢀ
FREQUENCY (Hzꢀ
TEMPERATURE (°Cꢀ
18812 G35
18812 G34
18812 G33
18812fb
11
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
Common Mode Rejection Ratio
vs Frequency
0.1Hz to 10Hz Noise
Noise Voltage vs Frequency
120
100
80
60
40
20
0
50
45
40
35
30
25
20
15
10
5
V
S
A
V
=
= 1
5V
0
0.1
1
10 100 1k 10k 100k 1M
FREQUENCY (Hzꢀ
0
5
10
15
1s/DIV
20
25
30
1
10
100
1k
FREQUENCY (Hzꢀ
1881/2 G36
18812 G37
18812 G38
Noise Current Density
vs Frequency
Overshoot vs Capacitive Load
Total Noise vs Source Resistance
180
160
140
120
100
80
1000
100
10
30
25
20
15
10
5
V
S
= 15V
V
=
15V
S
L
R
= 10k
A
V
= 1
A
= –1
V
60
40
20
0
1
0
1
10
100
1000
1
10
100
1k
(Ωꢀ
10k
100k 1M
10
100
1k
10k
FREQUENCY (Hzꢀ
R
CAPACITIVE LOAD (pFꢀ
S
18812 G39
18812 G40
18812 G41
Series Output Resistance
vs Capacitive Load
Undistorted Output Swing
vs Frequency
THD + Noise vs Frequency
120
100
80
60
40
20
0
35
30
25
20
15
10
5
10
1
V
V
=
IN
15V
P-P
A
T
= 1
= 25°C
S
V
A
= 2V
V
V
=
=
2.5V
15V
S
S
A
= –1
V
A
T
= 25°C
V
= 15V
S
0.1
0.01
0.001
0.0001
A
A
= –1
= 1
V
V
A
= –1
V
A
T
= 25°C
V
= 2.5V
S
0
0
2000
4000
6000
8000
10000
1
10
FREQUENCY (kHzꢀ
100
10
100
1k
FREQUENCY (Hzꢀ
10k
100k
CAPACITIVE LOAD (pFꢀ
1881/2 G42
18812 G43
18812 G44
18812fb
12
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
Total Harmonic Distortion + Noise
vs Output Voltage Amplitude
Open-Loop Gain
10
f = 1kHz
RF = RG = 10k
A
V
= –1
R
= 2k
V
S
L
R
= 10k
L
=
2.5V
1
0.1
A
V
= –1
V
S
=
15V
R
L
= 50k
A
V
= 2
=
V
S
2.5V
0.01
0.001
18812 G46
OUTPUT VOLTAGE (5V/DIVꢀ
A
V
= 2
=
V
S
15V
10m
0.1
1
10
100
OUTPUT VOLTAGE AMPLITUDE (V
ꢀ
P-P
18812 G45
Settling Time/Output Step 0.01%
Settling Time/Output Step 0.01%
GND
10V
10V
GND
0.5mV/DIV
0.5mV/DIV
18812 G47
18812 G48
20μs/DIV
50μs/DIV
A
V
= 1
=
A
V
= 1
=
V
S
V
S
15V
15V
Gain vs Temperature
Gain vs Load Resistance
6.0
5.0
4.0
3.0
2.0
1.0
0
10.0
0V TO 10V
V
S
= 5V
+A
(0V TO 10Vꢀ
VOL
0V TO –10V
–A
(0V TO –10Vꢀ
VOL
1.0
R
L
= 10k
R
= 2k
L
V
S
=
15V
0.1
–60 –40 –20
0
20 40 60 80 100 120 130
0
5
10
15
20
25
30
TEMPERATURE (°Cꢀ
LOAD RESISTANCE (kΩꢀ
18812 G49
18812 G50
18812fb
13
LT1881/LT1882
APPLICATIONS INFORMATION
The LT1881 dual and LT1882 quad op amps feature
exceptional input precision with rail-to-rail output swing.
The amplifiers are similar to the LT1884 and LT1885
devices. The LT1881 and LT1882 offer superior capacitive
loaddrivingcapabilitiesovertheLT1884andLT1885inlow
voltagegainconfigurations.Offsetvoltagesaretrimmedto
lessthan50μVandinputbiascurrentsarelessthan200pA
onthe“A”gradedevices.Obtainingbeneficialadvantageof
theseprecisioninputcharacteristicsdependsuponproper
applications circuit design and board layout.
PCboardlayoutisimportanttoinsurethatleakagecurrents
do not corrupt the low I of the amplifier. In high
precision, high impedance circuits, the input pins should
be surrounded by a guard ring of PC board interconnect,
with the guard driven to the same common mode voltage
as the amplifier inputs.
BIAS
Input Common Mode Range
The LT1881 and LT1882 outputs are able to swing nearly
to each power supply rail, but the input stage is limited
–
+
to operating between V +1V and V –1V. Exceeding this
common mode range will cause the gain to drop to zero;
however, no phase reversal will occur.
Preserving Input Precision
PreservingtheinputvoltageaccuracyoftheLT1881/LT1882
requires that the applications circuit and PC board layout
do not introduce errors comparable to or greater than the
30μV offset. Temperature differentials across the input
connections can generate thermocouple voltages of 10’s
of microvolts. PC board layouts should keep connections
to the amplifier’s input pins close together and away from
heatdissipatingcomponents.Aircurrentsacrosstheboard
can also generate temperature differentials.
Input Protection
The inverting and noninverting input pins of the LT1881
andLT1882havelimitedon-chipprotection.ESDprotection
is provided to prevent damage during handling. The input
transistors have voltage clamping and limiting resistors
to protect against input differentials up to 10V. Short
transients above this level will also be tolerated. If the
input pins can see a sustained differential voltage above
10V, external limiting resistors should be used to prevent
damage to the amplifier. A 1k resistor in each input lead
will provide protection against a 30V differential voltage.
The extremely low input bias currents, 150pA, allow high
accuracy to be maintained with high impedance sources
and feedback networks. The LT1881/LT1882’s low input
bias currents are obtained by using a cancellation circuit
on-chip. This causes the resulting I
+ and I
– to
BIAS
BIAS
Capacitive Loads
be uncorrelated, as implied by the I specification being
OS
greater than the I
. The user should not try to balance
The LT1881 and LT1882 can drive capacitive loads up to
1000pFinunity-gain.Thecapacitiveloaddrivingincreases
as the amplifier is used in higher gain configurations.
Capacitive load driving may be increased by decoupling
the capacitance from the output with a small resistance.
BIAS
the input resistances in each input lead, as is commonly
recommended with most amplifiers. The impedance at
eitherinputshouldbekeptassmallaspossibletominimize
total circuit error.
18812fb
14
LT1881/LT1882
PACKAGE DESCRIPTION
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510ꢀ
.400ꢁ
(10.160ꢀ
MAX
8
7
6
5
4
.255 .015ꢁ
(6.477 0.381ꢀ
1
2
3
.130 .005
.300 – .325
.045 – .065
(3.302 0.127ꢀ
(1.143 – 1.651ꢀ
(7.620 – 8.255ꢀ
.065
(1.651ꢀ
TYP
.008 – .015
(0.203 – 0.381ꢀ
.120
.020
(0.508ꢀ
MIN
(3.048ꢀ
MIN
.018 .003
(0.457 0.076ꢀ
+.035
.325
–.015
.100
(2.54ꢀ
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 (0.254mmꢀ
18812fb
15
LT1881/LT1882
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610ꢀ
.189 – .197
(4.801 – 5.004ꢀ
.045 .005
.160 .005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.150 – .157
(3.810 – 3.988ꢀ
NOTE 3
.228 – .244
(5.791 – 6.197ꢀ
.030 .005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508ꢀ
s 45°
.053 – .069
(1.346 – 1.752ꢀ
.004 – .010
(0.101 – 0.254ꢀ
.008 – .010
(0.203 – 0.254ꢀ
0°– 8° TYP
.016 – .050
(0.406 – 1.270ꢀ
.050
(1.270ꢀ
BSC
.014 – .019
(0.355 – 0.483ꢀ
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERSꢀ
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mmꢀ
SO8 0303
18812fb
16
LT1881/LT1882
PACKAGE DESCRIPTION
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610ꢀ
.337 – .344
.045 .005
(8.560 – 8.738ꢀ
.050 BSC
NOTE 3
13
12
11
10
8
14
N
9
N
.245
MIN
.160 .005
.150 – .157
(3.810 – 3.988ꢀ
NOTE 3
.228 – .244
(5.791 – 6.197ꢀ
1
2
3
N/2
N/2
.030 .005
TYP
RECOMMENDED SOLDER PAD LAYOUT
7
1
2
3
4
5
6
.010 – .020
(0.254 – 0.508ꢀ
s 45°
.053 – .069
(1.346 – 1.752ꢀ
.004 – .010
(0.101 – 0.254ꢀ
.008 – .010
(0.203 – 0.254ꢀ
0° – 8° TYP
.050
(1.270ꢀ
BSC
.014 – .019
(0.355 – 0.483ꢀ
TYP
.016 – .050
(0.406 – 1.270ꢀ
S14 0502
NOTE:
INCHES
(MILLIMETERSꢀ
2. DRAWING NOT TO SCALE
1. DIMENSIONS IN
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mmꢀ
18812fb
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However,noresponsibilityisassumedforitsuse.LinearTechnologyCorporationmakesnorepresentation
that the interconnection of its circuits as described herein will not infringe on existing patent rights.
17
LT1881/LT1882
TYPICAL APPLICATION
–50°C to 600°C Digital Thermometer Operates on 3.3V
V
CC
= 3.3V
R
F
1k
R1
4k
R2
4k
V
CC
–
V
V
CC
REF
A2
1μF
+IN
CLK
1/2 LT1881
R
T
R3
1k
LTC1287
–IN
D
OUT
V
CC
+
GND
CS/SHDN
–
A1
10k
0.1%
1/2 LT1881
V
CC
V =
+ 1.588mV/°C
+
2
10k
0.1%
RT: OMEGA F4132 1000Ω RTD
R1, R2, R3, RF: USE BI 698-3 2k s 8 RESISTOR NETWORK
18812 TA02
RELATED PARTS
PART NUMBER
LT1112/LT1114
LT1167
DESCRIPTION
Dual/Quad Picoamp Input Op Amps
COMMENTS
= 60μV Max
V
OS
Gain Programmable Instrumentation Amp
Low Noise, Rail-to-Rail Precision Op Amp
Low Noise JFET Op Amp
Gain Error = 0.08% Max
e = 3.2nV/√Hz
LT1677
n
LT1793
I = 10pA Max
B
LT1880
SOT-23 Picoamp Input Precision Op Amp
Dual/Quad Picoamp Input Op Amps
Zero Drift Op Amp in SOT-23
150μV Max V , –40°C to 85°C Operation Guaranteed, SOT-23 Package
OS
LT1884/LT1885
LTC2050
3 Times Faster than LT1881/LT1882
V
OS
= 3μV Max, Rail-to-Rail Output
LTC6011/LTC6012 Dual/Quad 135μA Rail-to-Rail Output Precision Op Amps Lower Power, Available in DFN Package
LTC6081/LTC6082 Dual/Quad Precision CMOS Op Amps
I = 1pA Max, V = 70μV Max
B OS
18812fb
LT 0809 REV B • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
18
●
●
© LINEAR TECHNOLOGY CORPORATION 2000
(408ꢀ 432-1900 FAX: (408ꢀ 434-0507 www.linear.com
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