LT1881/LT1882
Dual and Quad
Rail-to-Rail Output,
Picoamp Input Precision Op Amps
FEATURES
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■
■
■
■
■
■
■
DESCRIPTIO
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
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 tempera-
ture 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Thermocouple Amplifiers
Bridge Transducer Conditioners
Instrumentation Amplifiers
Battery-Powered Systems
Photo Current Amplifiers
TYPICAL APPLICATIO
5V
16-Bit Voltage Output DAC on
±5V
Supply
26
24
22
20
18
16
14
12
10
8
6
4
2
0
V
S
=
±15V
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
40 N8 (1 LOT)
144 S8 (2 LOTS)
184 TOTAL PARTS
–
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)
1881/2 TA01a
LTC
®
1597
+
–5V
V
OUT
– 4.096V
TO 4.096V
1881/2 TA01
U
18812fa
U
U
1
LT1881/LT1882
ABSOLUTE
AXI U RATI GS
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
PACKAGE/ORDER I FOR ATIO
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
ORDER PART NUMBER
LT1881CN8
LT1881IN8
LT1881CS8
LT1881IS8
LT1881ACN8
LT1881AIN8
LT1881ACS8
LT1881AIS8
S8 PART MARKING
1881
1881I
1881A
1881AI
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 130°C/W (N8)
T
JMAX
= 150°C,
θ
JA
= 190°C/W (S8)
Consult LTC marketing for parts specified with wider operating temperature ranges.
The
●
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)
SYMBOL
V
OS
PARAMETER
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
ΔV
OS
/ΔT
Input Offset Voltage Drift
(Note 6)
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
●
●
●
●
●
●
●
●
●
●
ELECTRICAL CHARACTERISTICS
CONDITIONS
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
ΔV
OS
/ΔTIME Long-Term Input Offset Voltage Stability
I
OS
2
U
U
W
W W
U
W
(Note 1)
Operating Temperature Range (Note 4) .. – 40°C to 85°C
Specified Temperature Range (Note 5) ... – 40°C to 85°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
14 OUT D
A
D
13 –IN D
12 +IN D
11 V –
B
C
10 +IN C
9
8
–IN C
OUT C
ORDER PART NUMBER
LT1882CS
LT1882IS
S PACKAGE
14-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/W
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/
MIN
TYP
25
MAX
50
85
110
80
125
150
0.8
0.8
200
250
300
500
600
700
UNITS
μV
μV
μV
μV
μV
μV
μV/°C
μV/°C
μV/month
pA
pA
pA
pA
pA
pA
18812fa
30
0.3
0.3
0.3
100
150
LT1881/LT1882
The
●
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)
SYMBOL
I
B
PARAMETER
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
Input Noise Voltage
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
●
●
●
●
●
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
TYP
100
MAX
200
250
300
500
600
700
UNITS
pA
pA
pA
pA
pA
pA
μV
P-P
nV/√Hz
pA/√Hz
MΩ
GΩ
pF
150
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential Mode
Common Mode
●
●
●
0.5
14
0.03
20
100
2
V
–
+ 1.0
V
–
+ 1.2
106
104
106
106
500
350
300
250
250
200
128
V
+
– 1.0
V
+
– 1.2
V
V
dB
dB
dB
dB
Common Mode Rejection Ratio
Power Supply Rejection Ratio
1V < V
CM
< 4V
1.2V < V
CM
< 3.8V
V
–
= 0V, V
CM
= 1.5V
0°C < T
A
< 85°C, 2.7V < V
+
< 32V
T
A
= –40°C, 3V < V
+
< 32V
R
L
= 10k; 1V < V
OUT
< 4V
●
●
●
●
132
132
2.4
1600
800
400
20
25
70
270
120
130
180
360
40
50
150
600
220
230
300
600
0.85
1.2
0.9
1.4
1.0
1.5
2.7
Minimum Operating Supply Voltage
A
VOL
Large-Signal Voltage Gain
V
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
18812fa
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
SOURCE
= 100μA
I
SOURCE
= 1mA
I
SOURCE
= 5mA
V
S
= 3V, 0V
●
●
●
●
●
●
●
●
V
OH
Output Voltage Swing High
(Referred to V
+
)
I
S
Supply Current Per Amplifier
0.45
●
0.65
0.65
0.70
30
30
1.0
120
30
V
S
= 5V, 0V
●
0.5
0.5
●
●
●
V
S
= 12V, 0V
I
SC
GBW
t
S
Short-Circuit Current
Gain Bandwidth Product
Channel Separation
Settling Time
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
15
15
0.35
3
LT1881/LT1882
The
●
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)
SYMBOL
SR
+
SR
–
FPBW
ΔV
OS
PARAMETER
Slew Rate Positive
Slew Rate Negative
Full-Power Bandwidth
Offset Voltage Match (LT1881A)
CONDITIONS
A
V
= – 1
●
ELECTRICAL CHARACTERISTICS
MIN
0.15
0.12
0.11
0.08
8.75
6.35
TYP
0.35
0.18
14
30
MAX
UNITS
V/μs
V/μs
V/μs
V/μs
kHz
kHz
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
(Notes 6, 7)
(Notes 7, 8)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
(Notes 7, 8)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
(Notes 7, 9)
V
–
= 0V, V
CM
= 1.5V
0°C < T
A
< 85°C, 2.7V < V
+
< 32V
T
A
= –40°C, 3V < V
+
< 32V
●
●
●
70
125
160
125
175
235
1.2
300
400
500
700
900
1000
μV
μV
μV
μV
μV
μV
μV/°C
pA
pA
pA
pA
pA
pA
dB
dB
dB
Offset Voltage Match (LT1881/LT1882)
35
●
●
●
●
●
Offset Voltage Match Drift
ΔI
B
+
Noninverting Bias Current Match
(LT1881A)
Noninverting Bias Current Match
(LT1881/LT1882)
ΔCMRR
ΔPSRR
Common Mode Rejection Match
Power Supply Rejection Match
(Notes 7, 9)
0.4
200
250
●
●
●
●
102
104
104
125
126
126
The
●
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)
SYMBOL
V
OS
PARAMETER
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
ΔV
OS
/ΔT
Input Offset Voltage Drift
(Note 6)
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
●
●
●
●
●
●
●
●
●
●
CONDITIONS
MIN
TYP
25
MAX
50
85
110
80
125
150
0.8
0.8
200
250
300
500
600
700
UNITS
μV
μV
μV
μV
μV
μV
μV/°C
μV/°C
μV/month
pA
pA
pA
pA
pA
pA
30
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
0.3
0.3
0.3
150
ΔV
OS
/ΔTIME Long-Term Input Offset Voltage Stability
I
OS
150
18812fa
4
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
The
●
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)
SYMBOL
I
B
PARAMETER
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
Input Noise Voltage
e
n
i
n
R
IN
C
IN
V
CM
CMRR
+PSRR
–PSRR
A
VOL
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
●
●
●
●
●
CONDITIONS
MIN
TYP
150
MAX
200
250
300
500
600
700
UNITS
pA
pA
pA
pA
pA
pA
μV
P-P
nV/√Hz
pA/√Hz
MΩ
GΩ
pF
150
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential Mode
Common Mode
●
●
●
0.5
14
0.03
20
100
2
V
–
+ 1.0
V
–
+ 1.2
114
110
106
1000
700
175
125
90
65
130
132
132
±1.2
1600
420
230
20
25
70
270
160
160
180
360
0.5
●
V
+
– 1.0
V
+
– 1.2
V
V
dB
dB
dB
Common Mode Rejection Ratio
Positive Power Supply Rejection Ratio
Negative Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Large-Signal Voltage Gain
–13.5V < V
CM
< 13.5V
V
–
= –15V, V
CM
= 0V; 1.5V < V
+
< 18V
V
+
= 15V, V
CM
= 0V; –1.5V < V
–
< –18V
R
L
= 10k; –13.5V < V
OUT
< 13.5V
●
●
●
●
●
±1.35
V
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
R
L
= 2k; –13.5V < V
OUT
< 13.5V
●
R
L
= 1k; –12V < V
OUT
< 12V
●
V
OL
Output Voltage Swing Low
(Referred to V
EE
)
No Load
I
SINK
= 100μA
I
SINK
= 1mA
I
SINK
= 5mA
No Load
I
SOURCE
= 100μA
I
SOURCE
= 1mA
I
SOURCE
= 5mA
V
S
=
±15V
V
OUT
Short to V
–
●
●
●
●
●
●
●
●
40
50
150
600
220
230
300
600
1.1
1.6
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
mA
mA
mA
MHz
dB
μs
V/μs
V/μs
18812fa
V
OH
Output Voltage Swing High
(Referred to V
CC
)
I
S
I
SC
Supply Current Per Amplifier
Short-Circuit Current
0.85
40
40
30
30
0.85
120
35
●
20
15
20
15
0.4
V
OUT
Short to V
+
●
GBW
t
S
SR
+
Gain Bandwidth Product
Channel Separation
Settling Time
Slew Rate Positive
f = 20kHz
f = 1kHz
0.01%, V
OUT
= – 5V to 5V,
A
V
= –1, R
L
= 2k
A
V
= – 1
●
0.21
0.18
0.4
5
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