FEATURES
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LT1881/LT1882
Dual and Quad
Rail-to-Rail Output, Picoamp
Input Precision Op Amps
DESCRIPTION
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.
The amplifiers work on any total power supply voltage
between 2.7V and 36V (fully specified from 5V to ±15V).
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.
Capacitive loads up to 1000pF can be driven directly in
unity-gain follower applications.
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.
Offset Voltage: 50μV Maximum (LT1881A)
Input Bias Current: 200pA Maximum (LT1881A)
Offset Voltage Drift: 0.8μV/°C Maximum
Rail-to-Rail Output Swing
Supply Range: 2.7V to 36V
Operates with Single or Split Supplies
Open-Loop Voltage Gain: 1 Million Minimum
1mA Maximum Supply Current Per Amplifier
Stable at A
V
= 1, C
L
= 1000pF
Standard Pinouts
Wide Operating Temperature Range:
–55°C to 125°C (LT1882)
APPLICATIONS
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Thermocouple Amplifiers
Bridge Transducer Conditioners
Instrumentation Amplifiers
Battery-Powered Systems
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
5V
26
24
22
20
18
16
14
12
10
8
6
4
2
0
V
S
= ±15V
40 N8 (1 LOT)
144 S8 (2 LOTS)
184 TOTAL PARTS
TC V
OS
Distribution, Industrial Grade
5V
+
LT1881
–
LT1634
4.096V
R1
–5V
R
COM
REF
R
OFS
33pF
5V
DAC
PERCENT OF UNITS (%)
1.65k
–
LT1881
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/°C)
18812 TA01b
LTC
®
1597
+
–5V
V
OUT
–4.096V
TO 4.096V
18812 TA01a
18812fb
1
LT1881/LT1882
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (V
+
to V
–
) .........................................40V
Differential Input Voltage (Note 2)...........................±10V
Input Voltage..................................................... V
+
to V
–
Input Current (Note 2)..........................................±10mA
Output Short-Circuit Duration (Note 3) ............ Indefinite
Operating Temperature Range (Note 4)
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
Specified Temperature Range (Note 5)
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 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
–
4
N8 PACKAGE
8-LEAD PDIP
A
B
8
7
6
5
V+
OUT B
–IN B
+IN B
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
S8 PACKAGE
8-LEAD PLASTIC SO
OUT B 7
B
C
A
D
14 OUT D
13 –IN D
12 +IN D
11 V –
10 +IN C
9
8
–IN C
OUT C
T
JMAX
= 150°C,
θ
JA
= 130°C/W (N8)
T
JMAX
= 150°C,
θ
JA
= 190°C/W (S8)
S PACKAGE
14-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 160°C/W
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
LT1882HS#PBF
LT1882MPS#PBF
TAPE AND REEL
LT1881CN8#TRPBF
LT1881IN8#TRPBF
LT1881CS8#TRPBF
LT1881IS8#TRPBF
LT1881ACN8#TRPBF
LT1881AIN8#TRPBF
LT1881ACS8#TRPBF
LT1881AIS8#TRPBF
LT1882CS#TRPBF
LT1882IS#TRPBF
LT1882HS#TRPBF
LT1882MPS#TRPBF
PART MARKING
LT1881CN8
LT1881IN8
1881
1881I
LT1881ACN8
LT1881AIN8
1881A
1881AI
LT1882CS
LT1882IS
LT1882HS
LT1882MPS
PACKAGE DESCRIPTION
8-Lead PDIP
8-Lead PDIP
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead PDIP
8-Lead PDIP
8-Lead Plastic SO
8-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
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
SYMBOL PARAMETER
V
OS
Input Offset Voltage (LT1881A)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Offset Voltage (LT1881/LT1882)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
– 40°C < T
A
< 125°C
– 55°C < T
A
< 125°C
ΔV
OS
/ΔT Input Offset Voltage Drift
(Note 6)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
– 40°C < T
A
< 125°C
– 55°C < T
A
< 125°C
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Single supply operation V
S
= 5V, 0V; V
CM
= V
S
/2 unless otherwise noted.
(Note 5)
C/I Grades
CONDITIONS
MIN
TYP
25
MAX
50
85
110
80
125
150
30
80
H/MP Grades
MIN
TYP
MAX
UNITS
μV
μV
μV
μV
μV
μV
μV
μV
μV/°C
μV/°C
μV/°C
μV/°C
μV/month
pA
pA
pA
150
500
pA
pA
pA
pA
pA
pA
pA
pA
150
500
pA
pA
pA
pA
pA
μV
P-P
nV/√Hz
pA/√Hz
MΩ
GΩ
pF
V+ – 1.0
V+ – 1.2
128
V
V
dB
dB
dB
dB
dB
dB
2.4
2.7
V
18812fb
30
300
300
0.3
0.3
0.8
0.8
0.3
0.3
0.3
100
200
250
300
500
600
700
0.3
0.8
0.8
ΔV
OS
/
ΔTIME
I
OS
Long-Term Input Offset
Voltage Stability
Input Offset Current (LT1881A)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Offset Current (LT1881/LT1882)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
– 40°C < T
A
< 125°C
– 55°C < T
A
< 125°C
l
l
l
l
l
l
150
2000
2000
100
200
250
300
500
600
700
I
B
Input Bias Current (LT1881A)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Bias Current (LT1881/LT1882)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
– 40°C < T
A
< 125°C
– 55°C < T
A
< 125°C
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential Mode
Common Mode
l
l
l
l
l
l
l
l
l
150
3000
3000
0.5
14
0.03
20
100
2
V+ – 1.0 V
–
+ 1.0
V+ – 1.2 V
–
+ 1.2
128
106
102
0.5
14
0.03
20
100
2
e
n
i
n
R
IN
C
IN
V
CM
CMRR
PSRR
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
V
–
+ 1.0
l
V
–
+ 1.2
1V < V
CM
< 4V
1.2V < V
CM
< 3.8V
l
106
104
106
V
–
= 0V, V
CM
= 1.5V
0°C < T
A
< 85°C, 2.7V < V
+
< 32V
l
0°C < T
A
< 125°C, 2.7V < V
+
< 32V
l
T
A
= –40°C, 3V < V
+
< 32V
T
A
= –55°C, 3V < V
+
< 32V
l
106
106
106
2.4
2.7
Minimum Operating Supply Voltage
3
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
A
VOL
Large-Signal Voltage Gain
CONDITIONS
R
L
= 10k; 1V < V
OUT
< 4V
R
L
= 2k; 1V < V
OUT
< 4V
R
L
= 1k; 1V < V
OUT
< 4V
V
OL
Output Voltage Swing Low
No Load
I
SINK
= 100μA
I
SINK
= 1mA
I
SINK
= 5mA
No Load
I
SINK
= 100μA
I
SINK
= 1mA
I
SINK
= 5mA
V
S
= 3V, 0V
V
S
= 5V, 0V
V
S
= 12V, 0V
I
SC
GBW
t
S
SR
+
SR
–
FPBW
ΔV
OS
Short-Circuit Current
Gain Bandwidth Product
Channel Separation
Settling Time
Slew Rate Positive
Slew Rate Negative
Full-Power Bandwidth
Offset Voltage Match
(LT1881A)
Offset Voltage Match
(LT1881/LT1882)
V
OUT
Short to GND
V
OUT
Short to V
+
f = 20kHz
f = 1kHz
0.01%, V
OUT
= 1.5V to 3.5V,
A
V
= –1, R
L
= 2k
A
V
= –1
A
V
= –1
V
OUT
= 4V
P-P
(Note 10)
(Note 7)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
(Note 7)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
– 40°C < T
A
< 125°C
– 55°C < T
A
< 125°C
(Notes 6, 7)
(Note 7)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Single supply operation V
S
= 5V, 0V; V
CM
= V
S
/2 unless otherwise noted.
(Note 5)
C/I Grades
MIN
500
350
300
250
250
200
TYP
1600
800
400
20
25
70
270
120
130
180
360
0.45
l
H/MP Grades
MAX
MIN
500
300
300
200
250
150
40
50
150
600
220
230
300
600
0.85
1.2
0.9
1.4
1.0
1.5
0.45
0.5
0.5
10
10
0.35
TYP
1600
800
400
20
25
70
270
120
130
180
360
0.65
0.65
0.70
30
30
1.0
120
30
0.15
0.1
0.11
0.06
8.75
4.75
70
125
160
125
175
235
35
125
0.35
0.18
14
50
60
200
750
300
325
450
800
0.85
1.5
0.9
1.7
1.0
1.8
MAX
UNITS
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
mA
mA
mA
mA
mA
MHz
dB
μs
V/μs
V/μs
V/μs
V/μs
kHz
kHz
μV
μV
μV
μV
μV
μV
μV
μV
μV/°C
pA
pA
pA
V
OH
Output Voltage Swing High
(Referred to V
+
)
I
S
Supply Current Per Amplifier
0.65
0.65
0.70
30
30
1.0
120
30
0.5
l
0.5
l
l
l
15
15
0.35
0.15
0.12
0.11
0.08
8.75
6.35
0.35
0.18
14
30
35
l
l
l
l
l
l
l
385
385
0.4
200
1.2
300
400
500
0.4
1.2
Offset Voltage Match Drift
ΔI
B
+
Noninverting Bias Current Match
(LT1881A)
18812fb
4
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
ΔI
B
+
Noninverting Bias Current Match
(LT1881/LT1882)
CONDITIONS
(Note 7)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
– 40°C < T
A
< 125°C
– 55°C < T
A
< 125°C
(Notes 7, 9)
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Single supply operation V
S
= 5V, 0V; V
CM
= V
S
/2 unless otherwise noted.
(Note 5)
C/I Grades
MIN
TYP
250
MAX
700
900
1000
H/MP Grades
MIN
TYP
250
MAX
700
UNITS
pA
pA
pA
pA
pA
dB
2000
2000
102
125
100
125
ΔCMRR
ΔPSRR
Common Mode Rejection Ratio
Match
Power Supply Rejection Match
(Notes 7, 9)
V
–
= 0V, V
CM
= 1.5V
0°C < T
A
< 85°C, 2.7V < V
+
< 32V
l
0°C < T
A
< 125°C, 2.7V < V
+
< 32V
l
T
A
= –40°C, 3V < V
+
< 32V
T
A
= –55°C, 3V < V
+
< 32V
104
104
126
102
126
102
126
126
dB
dB
dB
dB
The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
Split supply operation V
S
= ±15V, V
CM
= 0V unless otherwise noted. (Note 5)
C/I Grades
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
(LT1881A)
Input Offset Voltage
(LT1881/LT1882)
CONDITIONS
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
– 40°C < T
A
< 125°C
– 55°C < T
A
< 125°C
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
– 40°C < T
A
< 125°C
– 55°C < T
A
< 125°C
l
l
H/MP Grades
MAX
50
85
110
80
125
150
30
80
MIN
TYP
MAX
UNITS
μV
μV
μV
μV
μV
μV
μV
μV
μV/°C
μV/°C
μV/°C
μV/°C
μV/month
pA
pA
pA
150
500
pA
pA
pA
pA
pA
pA
pA
pA
150
500
pA
pA
pA
pA
pA
18812fb
MIN
TYP
25
30
l
l
l
l
l
l
l
l
300
300
0.3
0.3
0.8
0.8
0.3
0.3
0.3
100
200
250
300
500
600
700
0.3
0.8
0.8
ΔV
OS
/ΔT
Input Offset Voltage Drift
(Note 6)
ΔV
OS
/
ΔTIME
I
OS
Long-Term Input Offset
Voltage Stability
Input Offset Current (LT1881A)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Offset Current
(LT1881/LT1882)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
– 40°C < T
A
< 125°C
– 55°C < T
A
< 125°C
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Bias Current
(LT1881/LT1882)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
– 40°C < T
A
< 125°C
– 55°C < T
A
< 125°C
l
l
150
l
l
l
l
2000
2000
100
200
250
300
500
600
700
I
B
Input Bias Current (LT1881A)
l
l
150
l
l
l
l
3000
3000
5
嵌入式系统
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