LT1881/LT1882
1
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TYPICAL APPLICATION
DESCRIPTION
Dual and Quad
Rail-to-Rail Output, Picoamp
Input Precision Op Amps
The LT
®
1881 and LT1882 op amps bring high accuracy
input performance to amplifi ers with rail-to-rail output
swing. Input bias currents and capacitive load driving
capabilities are superior to the similar LT1884 and LT1885
amplifi ers, 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 amplifi ers work on any total power supply voltage
between 2.7V and 36V (fully specifi ed from 5V to ±15V).
Output voltage swings to within 40mV of the negative
supply and 220mV of the positive supply make these
amplifi ers 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 specifi cations, see the LT1884/LT1885.
FEATURES
APPLICATIONS
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
n Supply Range: 2.7V to 36V
n Operates with Single or Split Supplies
n Open-Loop Voltage Gain: 1 Million Minimum
n 1mA Maximum Supply Current Per Amplifi er
n Stable at AV = 1, CL = 1000pF
n Standard Pinouts
n Wide Operating Temperature Range:
–55°C to 125°C (LT1882)
n Thermocouple Amplifi ers
n Bridge Transducer Conditioners
n Instrumentation Amplifi ers
n Battery-Powered Systems
n Photo Current Amplifi ers
16-Bit Voltage Output DAC on ±5V Supply TC VOS Distribution, Industrial Grade
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.
–5V
5V
33pF
VOUT
–4.096V
TO 4.096V
LTC®1597
DAC
–
+
LT1881
+
–
LT1881
18812 TA01a
–5V
RCOM ROFS
REFR1
5V
1.65k
LT1634
4.096V
5V
INPUT OFFSET VOLTAGE DRIFT (μV/°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 (%)
18812 TA01b
26
24
22
20
18
16
14
12
10
8
6
4
2
0
VS = ±15V
40 N8 (1 LOT)
144 S8 (2 LOTS)
184 TOTAL PARTS
LT1881/LT1882
2
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ABSOLUTE MAXIMUM RATINGS
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) ............ Indefi nite
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
Specifi ed 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
(Note 1)
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
TJMAX = 150°C, θJA = 130°C/W (N8)
TJMAX = 150°C, θJA = 190°C/W (S8)
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
DA
CB
TJMAX = 150°C, θJA = 160°C/W
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1881CN8#PBF LT1881CN8#TRPBF LT1881CN8 8-Lead PDIP 0°C to 70°C
LT1881IN8#PBF LT1881IN8#TRPBF LT1881IN8 8-Lead PDIP –40°C to 85°C
LT1881CS8#PBF LT1881CS8#TRPBF 1881 8-Lead Plastic SO 0°C to 70°C
LT1881IS8#PBF LT1881IS8#TRPBF 1881I 8-Lead Plastic SO –40°C to 85°C
LT1881ACN8#PBF LT1881ACN8#TRPBF LT1881ACN8 8-Lead PDIP 0°C to 70°C
LT1881AIN8#PBF LT1881AIN8#TRPBF LT1881AIN8 8-Lead PDIP –40°C to 85°C
LT1881ACS8#PBF LT1881ACS8#TRPBF 1881A 8-Lead Plastic SO 0°C to 70°C
LT1881AIS8#PBF LT1881AIS8#TRPBF 1881AI 8-Lead Plastic SO –40°C to 85°C
LT1882CS#PBF LT1882CS#TRPBF LT1882CS 14-Lead Plastic SO 0°C to 70°C
LT1882IS#PBF LT1882IS#TRPBF LT1882IS 14-Lead Plastic SO –40°C to 85°C
LT1882HS#PBF LT1882HS#TRPBF LT1882HS 14-Lead Plastic SO –40°C to 125°C
LT1882MPS#PBF LT1882MPS#TRPBF LT1882MPS 14-Lead Plastic SO –55°C to 125°C
Consult LTC Marketing for parts specifi ed 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 specifi cations, go to: http://www.linear.com/tapeandreel/
LT1881/LT1882
3
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ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS
C/I Grades H/MP Grades
UNITSMIN TYP MAX MIN TYP MAX
VOS Input Offset Voltage (LT1881A)
0°C < TA < 70°C
–40°C < TA < 85°C
l
l
25 50
85
110
μV
μV
μV
Input Offset Voltage (LT1881/LT1882)
0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
30 80
125
150
30 80
300
300
μV
μV
μV
μV
μV
ΔVOS/ΔTInput Offset Voltage Drift
(Note 6)
0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
0.3
0.3
0.8
0.8
0.3
0.3
0.8
0.8
μV/°C
μV/°C
μV/°C
μV/°C
ΔVOS/
ΔTIME
Long-Term Input Offset
Voltage Stability
0.3 0.3 μV/month
IOS Input Offset Current (LT1881A)
0°C < TA < 70°C
–40°C < TA < 85°C
l
l
100 200
250
300
pA
pA
pA
Input Offset Current (LT1881/LT1882)
0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
150 500
600
700
150 500
2000
2000
pA
pA
pA
pA
pA
IBInput Bias Current (LT1881A)
0°C < TA < 70°C
–40°C < TA < 85°C
l
l
100 200
250
300
pA
pA
pA
Input Bias Current (LT1881/LT1882)
0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
150 500
600
700
150 500
3000
3000
pA
pA
pA
pA
pA
Input Noise Voltage 0.1Hz to 10Hz 0.5 0.5 μVP-P
enInput Noise Voltage Density f = 1kHz 14 14 nV/√Hz
inInput Noise Current Density f = 1kHz 0.03 0.03 pA/√Hz
RIN Input Resistance Differential Mode
Common Mode
l
l
20
100
20
100
MΩ
GΩ
CIN Input Capacitance l22pF
VCM Input Voltage Range
l
V– + 1.0
V– + 1.2
V+ – 1.0
V+ – 1.2
V– + 1.0
V– + 1.2
V+ – 1.0
V+ – 1.2
V
V
CMRR Common Mode Rejection Ratio 1V < VCM < 4V
1.2V < VCM < 3.8V l
106
104
128 106
102
128 dB
dB
PSRR Power Supply Rejection Ratio V– = 0V, VCM = 1.5V
0°C < TA < 85°C, 2.7V < V+ < 32V
0°C < TA < 125°C, 2.7V < V+ < 32V
TA = –40°C, 3V < V+ < 32V
TA = –55°C, 3V < V+ < 32V
l
l
106
106
106
106
dB
dB
dB
dB
Minimum Operating Supply Voltage l2.4 2.7 2.4 2.7 V
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. Single supply operation VS = 5V, 0V; VCM = VS/2 unless otherwise noted.
(Note 5)
LT1881/LT1882
4
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ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS
C/I Grades H/MP Grades
UNITSMIN TYP MAX MIN TYP MAX
AVOL Large-Signal Voltage Gain RL = 10k; 1V < VOUT < 4V
l
500
350
1600 500
300
1600 V/mV
V/mV
RL = 2k; 1V < VOUT < 4V
l
300
250
800 300
200
800 V/mV
V/mV
RL = 1k; 1V < VOUT < 4V
l
250
200
400 250
150
400 V/mV
V/mV
VOL Output Voltage Swing Low No Load
ISINK = 100μA
ISINK = 1mA
ISINK = 5mA
l
l
l
l
20
25
70
270
40
50
150
600
20
25
70
270
50
60
200
750
mV
mV
mV
mV
VOH Output Voltage Swing High
(Referred to V+)
No Load
ISINK = 100μA
ISINK = 1mA
ISINK = 5mA
l
l
l
l
120
130
180
360
220
230
300
600
120
130
180
360
300
325
450
800
mV
mV
mV
mV
ISSupply Current Per Amplifi er VS = 3V, 0V
l
0.45 0.65 0.85
1.2
0.45 0.65 0.85
1.5
mA
mA
VS = 5V, 0V
l
0.5 0.65 0.9
1.4
0.5 0.65 0.9
1.7
mA
mA
VS = 12V, 0V
l
0.5 0.70 1.0
1.5
0.5 0.70 1.0
1.8
mA
mA
ISC Short-Circuit Current VOUT Short to GND
VOUT Short to V+
l
l
15
15
30
30
10
10
30
30
mA
mA
GBW Gain Bandwidth Product f = 20kHz 0.35 1.0 0.35 1.0 MHz
Channel Separation f = 1kHz 120 120 dB
tSSettling Time 0.01%, VOUT = 1.5V to 3.5V,
AV = –1, RL = 2k
30 30 μs
SR+Slew Rate Positive AV = –1
l
0.15
0.12
0.35 0.15
0.1
0.35 V/μs
V/μs
SR–Slew Rate Negative AV = –1
l
0.11
0.08
0.18 0.11
0.06
0.18 V/μs
V/μs
FPBW Full-Power Bandwidth VOUT = 4VP-P
(Note 10) l
8.75
6.35
14 8.75
4.75
14 kHz
kHz
ΔVOS Offset Voltage Match
(LT1881A)
(Note 7)
0°C < TA < 70°C
–40°C < TA < 85°C
l
l
30 70
125
160
μV
μV
μV
Offset Voltage Match
(LT1881/LT1882)
(Note 7)
0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
35 125
175
235
35 125
385
385
μV
μV
μV
μV
μV
Offset Voltage Match Drift (Notes 6, 7) l0.4 1.2 0.4 1.2 μV/°C
ΔIB+Noninverting Bias Current Match
(LT1881A)
(Note 7)
0°C < TA < 70°C
–40°C < TA < 85°C
l
l
200 300
400
500
pA
pA
pA
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. Single supply operation VS = 5V, 0V; VCM = VS/2 unless otherwise noted.
(Note 5)
LT1881/LT1882
5
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SYMBOL PARAMETER CONDITIONS
C/I Grades H/MP Grades
UNITSMIN TYP MAX MIN TYP MAX
ΔIB+Noninverting Bias Current Match
(LT1881/LT1882)
(Note 7)
0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
250 700
900
1000
250 700
2000
2000
pA
pA
pA
pA
pA
ΔCMRR Common Mode Rejection Ratio
Match
(Notes 7, 9) l102 125 100 125 dB
ΔPSRR Power Supply Rejection Match
(Notes 7, 9)
V– = 0V, VCM = 1.5V
0°C < TA < 85°C, 2.7V < V+ < 32V
0°C < TA < 125°C, 2.7V < V+ < 32V
TA = –40°C, 3V < V+ < 32V
TA = –55°C, 3V < V+ < 32V
l
l
104
104
126
126
102
102
126
126
dB
dB
dB
dB
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. Single supply operation VS = 5V, 0V; VCM = VS/2 unless otherwise noted.
(Note 5)
The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C.
Split supply operation VS = ±15V, VCM = 0V unless otherwise noted. (Note 5)
SYMBOL PARAMETER CONDITIONS
C/I Grades H/MP Grades
UNITSMIN TYP MAX MIN TYP MAX
VOS Input Offset Voltage
(LT1881A) 0°C < TA < 70°C
–40°C < TA < 85°C
l
l
25 50
85
110
μV
μV
μV
Input Offset Voltage
(LT1881/LT1882) 0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
30 80
125
150
30 80
300
300
μV
μV
μV
μV
μV
ΔVOS/ΔTInput Offset Voltage Drift
(Note 6)
0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
0.3
0.3
0.8
0.8
0.3
0.3
0.8
0.8
μV/°C
μV/°C
μV/°C
μV/°C
ΔVOS/
ΔTIME
Long-Term Input Offset
Voltage Stability
0.3 0.3 μV/month
IOS Input Offset Current (LT1881A)
0°C < TA < 70°C
–40°C < TA < 85°C
l
l
100 200
250
300
pA
pA
pA
Input Offset Current
(LT1881/LT1882) 0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
150 500
600
700
150 500
2000
2000
pA
pA
pA
pA
pA
IBInput Bias Current (LT1881A)
0°C < TA < 70°C
–40°C < TA < 85°C
l
l
100 200
250
300
pA
pA
pA
Input Bias Current
(LT1881/LT1882) 0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
150 500
600
700
150 500
3000
3000
pA
pA
pA
pA
pA
LT1881/LT1882
6
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ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS
C/I Grades H/MP Grades
UNITSMIN TYP MAX MIN TYP MAX
Input Noise Voltage 0.1Hz to 10Hz 0.5 0.5 μVP-P
enInput Noise Voltage Density f = 1kHz 14 14 nV/√Hz
inInput Noise Current Density f = 1kHz 0.03 0.03 pA/√Hz
RIN Input Resistance Differential Mode
Common Mode
l
l
20
100
20
100
MΩ
GΩ
CIN Input Capacitance l22pF
VCM Input Voltage Range
l
V– + 1.0
V– + 1.2
V+ – 1.0
V+ – 1.2
V– + 1.0
V– + 1.2
V+ – 1.0
V+ – 1.2
V
V
CMRR Common Mode Rejection Ratio –13.5V < VCM < 13.5V l114 130 110 130 dB
+PSRR Positive Power Supply
Rejection Ratio
V– = –15V, VCM = 0V;
1.5V < V+ < 18V
l110 132 108 132 dB
–PSRR Negative Power Supply
Rejection Ratio
V+ = 15V, VCM = 0V;
–1.5V < V– < –18V
l106 132 104 132 dB
Minimum Operating
Supply Voltage
l±1.2 ±1.35 ±1.2 ±1.35 V
AVOL Large-Signal Voltage Gain RL = 10k; –13.5V < VOUT < 13.5V
l
1000
700
1600 1000
500
1600 V/mV
V/mV
RL = 2k; –13.5V < VOUT < 4V
l
175
125
420 175
110
420 V/mV
V/mV
RL = 1k; 1V < VOUT < 4V
l
90
65
230 90
7
230 V/mV
V/mV
VOL Output Voltage Swing Low
(Referred to VEE)
No Load
ISINK = 100μA
ISINK = 1mA
ISINK = 5mA
l
l
l
l
20
25
70
270
40
50
150
600
20
25
70
270
50
60
200
750
mV
mV
mV
mV
VOH Output Voltage Swing High
(Referred to VCC)
No Load
ISOURCE = 100μA
ISOURCE = 1mA
ISOURCE = 5mA
l
l
l
l
120
130
180
360
220
230
300
600
120
130
180
360
300
325
450
800
mV
mV
mV
mV
ISSupply Current Per Amplifi er VS = ±15V
l
0.5 0.85 1.1
1.6
0.5 0.85 1.1
2.0
mA
mA
ISC Short-Circuit Current VOUT Short to V–
l
20
15
40
40
20
10
40
40
mA
mA
VOUT Short to V+
l
20
15
30
30
20
10
30
30
mA
mA
GBW Gain Bandwidth Product f = 20kHz 0.4 0.85 0.4 0.85 MHz
Channel Separation f = 1kHz 120 120 dB
tSSettling Time 0.01%, VOUT = –5V to 5V,
AV = –1, RL = 2k
30 30 μs
SR+Slew Rate Positive AV = –1
l
0.21
0.18
0.4 0.21
0.15
0.4 V/μs
V/μs
SR–Slew Rate Negative AV = –1
l
0.13
0.1
0.20 0.11
0.07
0.20 V/μs
V/μs
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. Split supply operation VS = ±15V, VCM = 0V unless otherwise noted.
(Note 5)
LT1881/LT1882
7
18812fb
SYMBOL PARAMETER CONDITIONS
C/I Grades H/MP Grades
UNITSMIN TYP MAX MIN TYP MAX
FPBW Full-Power Bandwidth VOUT = 28VP-P
(Note 10) l
1.47
1.13
2.25 1.47
0.79
2.25 kHz
kHz
ΔVOS Offset Voltage Match
(LT1881A)
(Note 7)
0°C < TA < 70°C
–40°C < TA < 85°C
l
l
35 70
125
160
μV
μV
μV
Offset Voltage Match
(LT1881/LT1882)
(Note 7)
0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
42 125
175
235
42 125
435
435
μV
μV
μV
μV
μV
Offset Voltage Match Drift (Notes 6, 7) l0.4 1.1 0.4 1.1 μV/°C
ΔIB+Noninverting Bias Current Match
(LT1881A)
(Note 7)
0°C < TA < 70°C
–40°C < TA < 85°C
l
l
200 300
400
500
pA
pA
pA
ΔIB+Noninverting Bias Current Match
(LT1881/LT1882)
(Note 7)
0°C < TA < 70°C
–40°C < TA < 85°C
–40°C < TA < 125°C
–55°C < TA < 125°C
l
l
l
l
250 700
900
1000
250 700
2000
2000
pA
pA
pA
pA
pA
ΔCMRR Common Mode Rejection Match (Notes 7, 9) l110 125 106 125 dB
Δ+PSRR Positive Power Supply
Rejection Ratio Match
V– = –15V, VCM = 0V,
1.5V < V+ < 18V, (Notes 7, 9)
l108 130 108 130 dB
Δ–PSRR Negative Power Supply
Rejection Ratio Match
V+ = 15V, VCM = 0V,
–1.5V < V– < –18V, (Notes 7, 9)
l104 130 104 130 dB
ELECTRICAL CHARACTERISTICS ELECTRICAL CHARACTERISTICS
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 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 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 5: The LT1881C/LT1882C are guaranteed to meet specifi ed
performance from 0°C to 70°C. The LT1881C/LT1882C are designed,
characterized and expected to meet specifi ed performance from – 40°C
to 85°C but are not tested or QA sampled at these temperatures. The
LT1881I/LT1882I are guaranteed to meet specifi ed performance from
–40°C to 85°C. The LT1882H is guaranteed to meet specifi ed performance
from –40°C to 125°C. The LT1882MP is guaranteed to meet specifi ed
performance from –55°C to 125°C.
Note 6: This parameter is not 100% tested.
Note 7: Matching parameters are the difference between amplifi ers
A and B in the LT1881; and between amplifi ers A and D and B and C in the
LT1882.
Note 8: This parameter is the difference between the two noninverting
input bias currents.
Note 9: ΔCMRR and ΔPSRR are defi ned as follows: CMRR and PSRR are
measured in μV/V on each amplifi er. The difference is calculated in μV/V
and then converted to dB.
Note 10: Full power bandwidth is calculated from the slew rate: FPBW =
SR/2πVP.
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. Split supply operation VS = ±15V, VCM = 0V unless otherwise noted.
(Note 5)
LT1881/LT1882
8
18812fb
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current per Amplifi er
vs Supply Voltage Slew Rate vs Supply Voltage Slew Rate vs Temperature
Settling Time vs Output Step Settling Time vs Output Step
Gain Bandwidth Product
vs Supply Voltage
Phase Margin vs Supply Voltage Gain vs Frequency, AV = –1 Gain vs Frequency, AV = 1
TOTAL SUPPLY VOLTAGE (V)
SUPPLY CURRENT PER AMPLIFIER (μA)
18812 G01
1200
1000
800
600
400
200
0
125°C
25°C
–55°C
0 4 8 12 16 20 24 28 32 36
TOTAL SUPPLY VOLTAGE (V)
0
SLEW RATE (V/μs)
18812 G02
4 8 12 16 20 24 28 32 36
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
FALLING
RISING
AV = –1
TEMPERATURE (°C)
–50
SLEW RATE (V/μs)
18812 G03
–25 0 25 50 75 100 125 150
0.5
0.4
0.3
0.2
0.1
0
FALLING
RISING VS = ±15V
AV = –1
VS = ±5V
VS = ±15V
VS = ±5V
SETTLING TIME (μs)
0
OUTPUT STEP (V)
18812 G04
5 10 15 20 25 30 35 40 45 50 55 60 65
10
8
6
4
2
0
–2
–4
–6
–8
–10
VS = ±15V
AV = –1
0.1% 0.01%
0.1% 0.01%
SETTLING TIME (μs)
0
OUTPUT STEP (V)
18812 G05
5 10 15 20 25 30 35 40 45 50 55 60 65
10
8
6
4
2
0
–2
–4
–6
–8
–10
VS = ±15V
AV = 1
0.1% 0.01%
0.1% 0.01%
TOTAL SUPPLY VOLTAGE (V)
0
GAIN BANDWIDTH PRODUCT (kHz)
18812 G06
4 8 12 16 20 24 28 32 36
900
850
800
750
700
650
600
–55°C
125°C
25°C
TOTAL SUPPLY VOLTAGE (V)
0
PHASE MARGIN (DEG)
18812 G07
4 8 12 16 20 24 28 32 36
60
58
56
54
52
50
48
46
125°C
–55°C
125°C
FREQUENCY (Hz)
1k
GAIN (dB)
10k 100k 1M 10M 100M
10
0
–10
–20
–30
–40
VS = ±15VVS = ±2.5V
18812 G08
FREQUENCY (Hz)
1k
GAIN (dB)
10k 100k 1M 10M 100M
10
0
–10
–20
–30
–40
VS = ±15VVS = ±2.5V
18812 G09
LT1881/LT1882
9
18812fb
TYPICAL PERFORMANCE CHARACTERISTICS
Gain vs Frequency with CLOAD,
AV = 1
Gain vs Frequency with CLOAD,
AV = –1
Large Signal Response, AV = –1 Large Signal Response, AV = 1
Small Signal Response, AV = –1,
No Load
Small Signal Response, AV = –1,
CL = 1000pF
Small Signal Response, AV = 1,
RL = 2k
Small Signal Response, AV = 1,
CL = 500pF
FREQUENCY (Hz)
1k
GAIN (dB)
18812 G10
10k 100k 1M 10M 100M
10
0
–10
–20
–30
–40
0pF
1500pF
VS = ±15V
1000pF
500pF
FREQUENCY (Hz)
1k
GAIN (dB)
18812 G11
10k 100k 1M 10M 100M
10
0
–10
–20
–30
–40
1800pF
VS = ±15V
1000pF
500pF
0pF
TIME (50μs/DIV)
VOUT (5V/DIV)
18812 G12 TIME (50μs/DIV)
VOUT (5V/DIV)
18812 G13
TIME (2μs/DIV)
VOUT (20mV/DIV)
18812 G14
TIME (2μs/DIV)
VOUT (20mV/DIV)
18812 G15 TIME (2μs/DIV)
VOUT (20mV/DIV)
18812 G16 TIME (2μs/DIV)
VOUT (20mV/DIV)
18812 G17
LT1881/LT1882
10
18812fb
VOS Distribution, TA = 25°C Voltage Offset vs Temperature Warm-Up Drift vs Time
Input Bias Current
vs Common Mode Voltage Input Bias Current vs Temperature
Input Common Mode Range
vs Supply Voltage
Input Common Mode Range
vs Temperature
Output Voltage Swing
vs Supply Voltage
Output Saturation Voltage
vs Load Current (Output High)
TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT OFFSET VOLTAGE (μV)
PERCENT OF UNITS (%)
18812 G18
26
24
22
20
18
16
14
12
10
8
6
4
2
0–60 –40 –20 0 20 40 60
VS = ±15V
40 N8 (1 LOT)
144 S8 (2 LOTS)
184 TOTAL PARTS
TEMPERATURE (°C)
VOLTAGE OFFSET (μV)
18812 G19
200
150
100
50
0
–50
–100
–150
–200
–55 –35 –15 5 25 45 65 85 105 125
VS = ±15V
TIME AFTER POWER UP (s)
OFFSET VOLTAGE DRIFT (μV)
18812 G20
5
0
–5
–10
–15
–20
–25
–30 020 40 60 80 100 120 140
N8 VS = 5V
N8 VS = ±15V S8 VS = 5V, ±15V
VCM (V)
IBIAS (pA)
18812 G21
1000
800
600
400
200
0
200
400
600
800
1000
–20 –15 –10 –5 0 5 10 15 20
VS = ±15V
TEMPERATURE (°C)
INPUT BIAS CURRENT (pA)
18812 G22
–55 –35 –15 5 25 45 65 85 105 125
VS = ±15V
–IBIAS
+IBIAS
1400
1200
1000
800
600
400
200
0
–200
SUPPLY VOLTAGE (±V)
INPUT COMMON MODE RANGE (V)
18812 G23
V+ – 0
V+ – 0.2
V+ – 0.4
V+ – 0.6
V+ – 0.8
V– + 0.8
V– + 0.6
V– + 0.4
V– + 0.2
V– + 0
024 6 8 10 12 14 16
$VOS ≤ 1mV
–55°C
–40°C
25°C
85°C
125°C
TEMPERATURE (°C)
INPUT COMMON MODE LIMIT (V)
18812 G24
5
4
3
2
1
0
–1
–2
–3
–4
–5
–55 –35 –15 5 25 6545 85 105 125
LOWER LIMIT
UPPER LIMIT VS = ±5V
$VOS <1mV
SUPPLY VOLTAGE (±V)
OUTPUT VOLTAGE SWING (V)
18812 G25
V+ – 0
V+ – 0.5
V+ – 1.0
V– + 1.0
V– + 0.5
V– + 0 024 6 8 10 12 14 16 18 20
AV = –1
TA = 25°C
RL = 10k
RL = 2k
RL = 10k
RL = 2k
SOURCING LOAD CURRENT (mA)
0.001
0.01
OUTPUT SATURATION VOLTAGE (V)
0.1
1
0.10.01 1 10
18812 G26
VS = ±15V
VOVERDRIVE = 30mV
TA = –55°C
TA = –40°C
TA = 25°C
TA = 85°C
TA = 125°C
LT1881/LT1882
11
18812fb
Output Saturation Voltage
vs Load Current (Output Low)
Output Short-Circuit Current
vs Temperature
Output Voltage
vs Large Input Voltage
Open-Loop Gain vs Frequency
Open-Loop Gain and Phase
vs Frequency Channel Separation vs Frequency
Gain Bandwidth Product
vs Temperature Output Impedance vs Frequency PSRR vs Frequency
TYPICAL PERFORMANCE CHARACTERISTICS
SINKING LOAD CURRENT (mA)
OUTPUT SATURATION VOLTAGE (V)
0.001 0.1 1 10
18812 G27
0.01
10
1
0.1
0.01
VS = ±15V
VOVERDRIVE = 30mV
0.001
TA = –55°C
TA = –40°C
TA = 25°C
TA = 85°C
TA = 125°C
TEMPERATURE (°C)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
18812 G28
60
56
52
48
44
40
36
32
28
24
20
16
12
8
4
0
–55 –35 –15 5 25 45 65 85 105 125
SINKING
SOURCING
AV = 1
VS = ±2.5V
VIN = ±5V
RIN = 10k
18812 G29
GND
GNDVOUT
VIN
FREQUENCY (Hz)
LOOP GAIN (dB)
18812 G30
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
–10
–200.1 1 10 100 1k 10k 100k 1M 10M100M
VS = ±15V
FREQUENCY (Hz)
1k
LOOP GAIN (dB)
70
60
50
40
30
20
10
0
–10
–20
–30
PHASE (DEG)
175
150
120
100
75
50
25
0
–25
–50
–100
100k10k 1M 10M
18812 G31
VS = ±5V
PHASE
LOOP GAIN
FREQUENCY (Hz)
CHANNEL SEPARATION (dB)
18812 G32
–20
–40
–60
–80
–100
–120
–14010 100 1k 10k 100k 1M 10M 100M
VS = ±15V
AV = 10
TEMPERATURE (°C)
GAIN BANDWIDTH PRODUCT (kHz)
18812 G33
680
660
640
620
600
580
560
–55 –35 –15 5 4525 65 85 105 125
VS = ±15V
VS = ±2.5V
FREQUENCY (Hz)
100 1k 10k 100k
0.001
OUTPUT IMPEDANCE (Ω)
0.1
100
18812 G34
0.01
1
10
VS = ±2.5V AV = 100
AV = 10
AV = 1
FREQUENCY (Hz)
1 10 100 1k 10k 100k 1M
PSSR (dB)
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
–10
18812 G35
–PSSR
VS = ±15V
+PSSR
LT1881/LT1882
12
18812fb
TYPICAL PERFORMANCE CHARACTERISTICS
Common Mode Rejection Ratio
vs Frequency 0.1Hz to 10Hz Noise Noise Voltage vs Frequency
Noise Current Density
vs Frequency Total Noise vs Source Resistance Overshoot vs Capacitive Load
Series Output Resistance
vs Capacitive Load
Undistorted Output Swing
vs Frequency THD + Noise vs Frequency
FREQUENCY (Hz)
0.1 1 10 100 1k 10k 100k 1M
CMRR (dB)
120
100
80
60
40
20
0
1881/2 G36
1s/DIV
0 5 10 15 20 25 30
NOISE VOLTAGE (0.2μV/DIV)
18812 G37
FREQUENCY (Hz)
1
NOISE VOLTAGE DENSITY (nV/VHz)
50
45
40
35
30
25
20
15
10
5
010010 1k
18812 G38
VS = ±5V
AV = 1
FREQUENCY (Hz)
1
NOISE CURRENT DENSITY (fA/√Hz)
180
160
140
120
100
80
60
40
20
010010 1000
18812 G39
VS = ±15V
RS (Ω)
1 10 100 1k 10k 100k 1M
TOTAL INPUT REFERRED NOISE (nV/√Hz)
1000
100
10
1
18812 G40
CAPACITIVE LOAD (pF)
10
OVERSHOOT (%)
30
25
20
15
10
5
01k100 10k
18812 G41
VS = ±15V
RL = 10k
AV = 1
AV = –1
CAPACITIVE LOAD (pF)
0 2000 4000 6000 8000 10000
SERIES OUTPUT RESISTANCE (Ω)
120
100
80
60
40
20
0
1881/2 G42
AV = 1
TA = 25°C VS = ±2.5V
VS = ±15V
FREQUENCY (kHz)
1
PEAK-TO-PEAK OUTPUT VOLTAGE (V)
35
30
25
20
15
10
5
010010
18812 G43
AV = –1
TA = 25°C
VS = ±15V
AV = –1
TA = 25°C
VS = ±2.5V
FREQUENCY (Hz)
10
THD + NOISE (%)
10
1
0.1
0.01
0.001
0.0001 1k100 10k 100k
18812 G44
VS = ±15V
VIN = 2VP-P
AV = –1
AV = 1
LT1881/LT1882
13
18812fb
TYPICAL PERFORMANCE CHARACTERISTICS
Total Harmonic Distortion + Noise
vs Output Voltage Amplitude Open-Loop Gain
Settling Time/Output Step 0.01% Settling Time/Output Step 0.01%
Gain vs Temperature Gain vs Load Resistance
OUTPUT VOLTAGE AMPLITUDE (VP-P)
10m
THD + NOISE (%)
10
1
0.1
0.01
0.001 10.1 10 100
18812 G45
f = 1kHz
RF = RG = 10k
AV = –1
VS = ±15V
AV = –1
VS = ±2.5V
AV = 2
VS = ±15V
AV = 2
VS = ±2.5V
OUTPUT VOLTAGE (5V/DIV)
CHANGE IN INPUT OFFSET VOLTAGE
(20μV/DIV)
18812 G46
RL = 2k
RL = 50k
RL = 10k
20μs/DIV
GND
10V
0.5mV/DIV
AV = 1
VS = ±15V
18812 G47 50μs/DIV
10V
GND
0.5mV/DIV
AV = 1
VS = ±15V
18812 G48
TEMPERATURE (°C)
GAIN (V/μV)
18812 G49
6.0
5.0
4.0
3.0
2.0
1.0
0
–60 –40 0–20 20 806040 100 120 130
VS = ±5V
RL = 10k
0V TO 10V
0V TO –10V
RL = 2k
LOAD RESISTANCE (kΩ)
GAIN (V/μV)
18812 G50
10.0
1.0
0.1 05
10 15 20 25 30
VS = ±15V
+AVOL (0V TO 10V)
–AVOL (0V TO –10V)
LT1881/LT1882
14
18812fb
The LT1881 dual and LT1882 quad op amps feature
exceptional input precision with rail-to-rail output swing.
The amplifi ers are similar to the LT1884 and LT1885
devices. The LT1881 and LT1882 offer superior capacitive
load driving capabilities over the LT1884 and LT1885 in low
voltage gain confi gurations. Offset voltages are trimmed to
less than 50μV and input bias currents are less than 200pA
on the “A” grade devices. Obtaining benefi cial advantage of
these precision input characteristics depends upon proper
applications circuit design and board layout.
Preserving Input Precision
Preserving the input voltage accuracy of the LT1881/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 amplifi er’s input pins close together and away from
heat dissipating components. Air currents across the board
can also generate temperature differentials.
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 IBIAS+ and IBIAS– to
be uncorrelated, as implied by the IOS specifi cation being
greater than the IBIAS. The user should not try to balance
the input resistances in each input lead, as is commonly
recommended with most amplifi ers. The impedance at
either input should be kept as small as possible to minimize
total circuit error.
PC board layout is important to insure that leakage currents
do not corrupt the low IBIAS of the amplifi er. 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 amplifi er inputs.
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.
Input Protection
The inverting and noninverting input pins of the LT1881
and LT1882 have limited on-chip protection. ESD protection
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 amplifi er. A 1k resistor in each input lead
will provide protection against a 30V differential voltage.
Capacitive Loads
The LT1881 and LT1882 can drive capacitive loads up to
1000pF in unity-gain. The capacitive load driving increases
as the amplifi er is used in higher gain confi gurations.
Capacitive load driving may be increased by decoupling
the capacitance from the output with a small resistance.
APPLICATIONS INFORMATION
LT1881/LT1882
15
18812fb
PACKAGE DESCRIPTION
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
N8 1002
.065
(1.651)
TYP
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.020
(0.508)
MIN
.018 ± .003
(0.457 ± 0.076)
.120
(3.048)
MIN
12 34
87 65
.255 ± .015*
(6.477 ± 0.381)
.400*
(10.160)
MAX
.008 – .015
(0.203 – 0.381)
.300 – .325
(7.620 – 8.255)
.325 +.035
–.015
+0.889
–0.381
8.255
()
NOTE:
1. DIMENSIONS ARE INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100
(2.54)
BSC
LT1881/LT1882
16
18812fb
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
PACKAGE DESCRIPTION
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)s 45°
0°– 8° TYP
.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1234
.150 – .157
(3.810 – 3.988)
NOTE 3
8765
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN .160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
LT1881/LT1882
17
18812fb
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 representation
that the interconnection of its circuits as described herein will not infringe on existing patent rights.
PACKAGE DESCRIPTION
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
1
N
234
.150 – .157
(3.810 – 3.988)
NOTE 3
14 13
.337 – .344
(8.560 – 8.738)
NOTE 3
.228 – .244
(5.791 – 6.197)
12 11 10 9
567
N/2
8
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)s 45°
0° – 8° TYP
.008 – .010
(0.203 – 0.254)
S14 0502
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
.245
MIN
N
1 2 3 N/2
.160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
LT1881/LT1882
18
18812fb
© LINEAR TECHNOLOGY CORPORATION 2000
LT 0809 REV B • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
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+
–
A1
1/2 LT1881
+
–
A2
1/2 LT1881
RF
1k
10k
0.1% RT: OMEGA F4132 1000Ω RTD
R1, R2, R3, RF: USE BI 698-3 2k s 8 RESISTOR NETWORK
18812 TA02
VCC
VCC
RTR3
1k
R1
4k
R2
4k
VCC = 3.3V
10k
0.1% V = + 1.588mV/°C
VCC
2
VREF VCC
1μF
+IN CLK
LTC1287
–IN DOUT
GND CS/SHDN
