www.docs.chipfind.ru
LT1881/LT1882
1
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-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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 50
V 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.
s
Thermocouple Amplifiers
s
Bridge Transducer Conditioners
s
Instrumentation Amplifiers
s
Battery-Powered Systems
s
Photo Current Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Offset Voltage: 50
V Maximum (LT1881A)
s
Input Bias Current: 200pA Maximum (LT1881A)
s
Offset Voltage Drift: 0.8
V/
C Maximum
s
Rail-to-Rail Output Swing
s
Supply Range: 2.7V to 36V
s
Operates with Single or Split Supplies
s
Open-Loop Voltage Gain: 1 Million Minimum
s
1mA Maximum Supply Current Per Amplifier
s
Stable at A
V
= 1, C
L
= 1000pF
s
Standard Pinouts
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
Dual and Quad
Rail-to-Rail Output,
Picoamp Input Precision Op Amps
April 2000
Final Electrical Specifications
5V
5V
33pF
V
OUT
4.096V
TO 4.096V
LTC
1597
DAC
+
LT1881
+
LT1881
1881/2 TA01
5V
R
COM
R
OFS
REF
R1
5V
1.65k
LT1634
4.096V
5V
16-Bit Voltage Output DAC on
5V Supply
INPUT OFFSET VOLTAGE DRIFT (
V/
C)
1
0.8
0.6
0.4
0.2
0
0.2
0.4
0.6
0.8
0.9
0.7
0.5
0.3
0.1
0.1
0.3
0.5
0.7
0.9 1
PERCENT OF UNITS (%)
1881/2 TA01a
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
LT1881/LT1882
2
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
ORDER PART NUMBER
S8 PART MARKING
T
JMAX
= 150
C,
JA
= 130
C/W (N8)
T
JMAX
= 150
C,
JA
= 190
C/W (S8)
Consult factory for Military grade parts.
1881
1881I
1881A
1881AI
LT1881CN8
LT1881IN8
LT1881CS8
LT1881IS8
LT1881ACN8
LT1881AIN8
LT1881ACS8
LT1881AIS8
ABSOLUTE AXI U
RATI GS
W
W
W
U
PACKAGE/ORDER I FOR ATIO
U
U
W
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25
C.
Single supply operation V
EE
= 0, V
CC
= 5V; V
CM
= V
CC
/2 unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage (LT1881A)
25
50
V
0
C < T
A
< 70
C
q
85
V
40
C < T
A
< 85
C
q
110
V
Input Offset Voltage (LT1881/LT1882)
30
80
V
0
C < T
A
< 70
C
q
125
V
40
C < T
A
< 85
C
q
150
V
Input Offset Voltage Drift
0
C < T
A
< 70
C
q
0.3
0.8
V/
C
(Note 6)
40
C < T
A
< 85
C
q
0.3
0.8
V/
C
I
OS
Input Offset Current (LT1881A)
100
200
pA
0
C < T
A
< 70
C
q
250
pA
40
C < T
A
< 85
C
q
300
pA
Input Offset Current (LT1881/LT1882)
150
500
pA
0
C < T
A
< 70
C
q
600
pA
40
C < T
A
< 85
C
q
700
pA
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
1
2
3
4
8
7
6
5
TOP VIEW
V+
OUT B
IN B
+IN B
OUT A
IN A
+IN A
V
B
A
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
S PACKAGE
14-LEAD PLASTIC SO
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OUT A
IN A
+IN A
V+
+IN B
IN B
OUT B
OUT D
IN D
+IN D
V
+IN C
IN C
OUT C
D
A
D
B
ORDER PART NUMBER
LT1882CS
LT1882IS
T
JMAX
= 150
C,
JA
= 150
C/W
(Note 1)
LT1881/LT1882
3
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25
C.
Single supply operation V
EE
= 0, V
CC
= 5V; V
CM
= V
CC
/2 unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
B
Input Bias Current (LT1881A)
100
200
pA
0
C < T
A
< 70
C
q
250
pA
40
C < T
A
< 85
C
q
300
pA
Input Bias Current (LT1881/LT1882)
150
500
pA
0
C < T
A
< 70
C
q
600
pA
40
C < T
A
< 85
C
q
700
pA
Input Noise Voltage
0.1Hz to 10Hz
0.5
V
P-P
e
n
Input Noise Voltage Density
f = 1kHz
14
nV/
Hz
i
n
Input Noise Current Density
f = 1kHz
0.03
pA/
Hz
V
CM
Input Voltage Range
V
EE
+ 1.0
V
CC
1.0
V
q
V
EE
+ 1.2
V
CC
1.2
V
CMRR
Common Mode Rejection Ratio
1V < V
CM
< 4V
106
128
dB
1.2V < V
CM
< 3.8V
q
104
dB
PSRR
Power Supply Rejection Ratio
V
EE
= 0, V
CM
= 1.5V; 2.7V < V
CC
< 32V
q
106
132
dB
Minimum Operating Supply Voltage
q
2.4
2.7
V
A
VOL
Large-Signal Voltage Gain
R
L
= 10k; 1V < V
OUT
< 4V
500
1600
V/mV
q
350
V/mV
R
L
= 2k; 1V < V
OUT
< 4V
300
800
V/mV
q
250
V/mV
R
L
= 1k; 1V < V
OUT
< 4V
250
400
V/mV
q
200
V/mV
V
OL
Output Voltage Swing Low
No Load
q
20
40
mV
I
SINK
= 100
A
q
25
50
mV
I
SINK
= 1mA
q
70
150
mV
I
SINK
= 5mA
q
270
600
mV
V
OH
Output Voltage Swing High
No Load
q
120
220
mV
(Referred to V
CC
)
I
SOURCE
= 100
A
q
130
230
mV
I
SOURCE
= 1mA
q
180
300
mV
I
SOURCE
= 5mA
q
360
600
mV
I
S
Supply Current Per Amplifier
V
CC
= 3V
0.45
0.65
0.85
mA
q
1.2
mA
V
CC
= 5V
0.5
0.65
0.9
mA
q
1.4
mA
V
CC
= 12V
0.5
0.70
1.0
mA
q
1.5
mA
I
SC
Short-Circuit Current
V
OUT
Short to GND
q
15
30
mA
V
OUT
Short to V
CC
q
15
30
mA
GBW
Gain-Bandwidth Product
f = 20kHz
0.5
1.0
MHz
t
S
Settling Time
0.01%, V
OUT
= 1.5V to 3.5V,
30
s
A
V
= 1, R
L
= 2k
SR
+
Slew Rate Positive
A
V
= 1
0.15
0.35
V/
s
q
0.12
V/
s
SR
Slew Rate Negative
A
V
= 1
0.11
0.18
V/
s
q
0.08
V/
s
LT1881/LT1882
4
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25
C.
Single supply operation V
EE
= 0, V
CC
= 5V; V
CM
= V
CC
/2 unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage (LT1881A)
25
50
V
0
C < T
A
< 70
C
q
85
V
40
C < T
A
< 85
C
q
110
V
Input Offset Voltage (LT1881/LT1882)
30
80
V
0
C < T
A
< 70
C
q
125
V
40
C < T
A
< 85
C
q
150
V
Input Offset Voltage Drift
0
C < T
A
< 70
C
q
0.3
0.8
V/
C
(Note 6)
40
C < T
A
< 85
C
q
0.3
0.8
V/
C
I
OS
Input Offset Current (LT1881A)
150
200
pA
0
C < T
A
< 70
C
q
250
pA
40
C < T
A
< 85
C
q
300
pA
Input Offset Current (LT1881/LT1882)
150
500
pA
0
C < T
A
< 70
C
q
600
pA
40
C < T
A
< 85
C
q
700
pA
I
B
Input Bias Current (LT1881A)
150
200
pA
0
C < T
A
< 70
C
q
250
pA
40
C < T
A
< 85
C
q
300
pA
Input Bias Current (LT1881/LT1882)
150
500
pA
0
C < T
A
< 70
C
q
600
pA
40
C < T
A
< 85
C
q
700
pA
Input Noise Voltage
0.1Hz to 10Hz
0.5
V
P-P
e
n
Input Noise Voltage Density
f = 1kHz
14
nV/
Hz
i
n
Input Noise Current Density
f = 1kHz
0.03
pA/
Hz
V
CM
Input Voltage Range
V
EE
+ 1.0
V
CC
1.0
V
q
V
EE
+ 1.2
V
CC
1.2
V
V
OS
Offset Voltage Match (LT1881A)
(Note 7)
30
70
V
0
C < T
A
< 70
C
q
125
V
40
C < T
A
< 85
C
q
160
V
Offset Voltage Match (LT1881/LT1882)
(Note 7)
35
125
V
0
C < T
A
< 70
C
q
175
V
40
C < T
A
< 85
C
q
235
V
Offset Voltage Match Drift
(Notes 6, 7)
q
0.4
1.2
V/
C
I
B
+
Noninverting Bias Current Match
(Notes 7, 8)
200
300
pA
(LT1881A)
0
C < T
A
< 70
C
q
400
pA
40
C < T
A
< 85
C
q
500
pA
Noninverting Bias Current Match
(Notes 7, 8)
250
700
pA
(LT1881/LT1882)
0
C < T
A
< 70
C
q
900
pA
40
C < T
A
< 85
C
q
1000
pA
CMRR
Common Mode Rejection Match
(Notes 7, 9)
q
102
125
dB
PSRR
Power Supply Rejection Match
V
EE
= 0V, V
CM
= 1.5V, 2.7V < V
CC
< 32V,
q
104
126
dB
(Notes 7, 9)
The
q
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)
LT1881/LT1882
5
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
The
q
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)
CMRR
Common Mode Rejection Ratio
13.5V < V
CM
< 13.5V
q
114
130
dB
+PSRR
Positive Power Supply Rejection Ratio
V
EE
= 15, V
CM
= 0; 1.5V < V
CC
< 18V
q
110
132
dB
PSRR
Negative Power Supply Rejection Ratio
V
CC
= 15, V
CM
= 0; 1.5V < V
EE
< 18V
q
106
132
dB
Minimum Operating Supply Voltage
q
1.2
1.35
V
A
VOL
Large-Signal Voltage Gain
R
L
= 10k; 13.5V < V
OUT
< 13.5V
1000
1600
V/mV
q
700
V/mV
R
L
= 2k; 13.5V < V
OUT
< 13.5V
175
420
V/mV
q
125
V/mV
R
L
= 1k; 12V < V
OUT
< 12V
90
230
V/mV
q
65
V/mV
V
OL
Output Voltage Swing Low
No Load
q
20
40
mV
(Referred to V
EE
)
I
SINK
= 100
A
q
25
50
mV
I
SINK
= 1mA
q
70
150
mV
I
SINK
= 5mA
q
270
600
mV
V
OH
Output Voltage Swing High
No Load
q
160
220
mV
(Referred to V
CC
)
I
SOURCE
= 100
A
q
160
230
mV
I
SOURCE
= 1mA
q
180
300
mV
I
SOURCE
= 5mA
q
360
600
mV
I
S
Supply Current Per Amplifier
V
S
=
15V
0.5
0.85
1.1
mA
q
1.6
mA
I
SC
Short-Circuit Current
V
OUT
Short to V
EE
20
40
mA
q
15
40
mA
V
OUT
Short to V
CC
20
30
mA
q
15
30
mA
GBW
Gain-Bandwidth Product
f = 20kHz
0.6
1.1
MHz
t
S
Settling Time
0.01%, V
OUT
= 5V to 5V,
35
s
A
V
= 1, R
L
= 2k
SR
+
Slew Rate Positive
A
V
= 1
0.21
0.4
V/
s
q
0.18
V/
s
SR
Slew Rate Negative
A
V
= 1
0.13
0.20
V/
s
q
0.1
V/
s
V
OS
Offset Voltage Match (LT1881/LT1882)
(Note 5)
42
125
V
0
C < T
A
< 70
C
q
175
V
40
C < T
A
< 85
C
q
235
V
Offset Voltage Match (LT1881A)
35
70
V
0
C < T
A
< 70
C
q
125
V
40
C < T
A
< 85
C
q
160
V
Offset Voltage Match Drift
(Notes 6, 7)
q
0.4
1.1
V/
C
I
B
+
Noninverting Bias Current Match
(Notes 7, 8)
240
700
pA
(LT1881/LT1882)
0
C < T
A
< 70
C
q
900
pA
40
C < T
A
< 85
C
q
1000
pA
Noninverting Bias Current Match
200
300
pA
(LT1881A)
0
C < T
A
< 70
C
q
400
pA
40
C < T
A
< 85
C
q
500
pA
CMRR
Common Mode Rejection Match
(Notes 7, 9)
q
110
125
dB
PDF 
ZIP