LINER LT1881 Dual and quad rail-to-rail output, picoamp input precision op amp Datasheet

LT1881/LT1882
Dual and Quad
Rail-to-Rail Output, Picoamp
Input Precision Op Amps
DESCRIPTION
FEATURES
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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 AV = 1, CL = 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
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.
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.
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.
TYPICAL APPLICATION
16-Bit Voltage Output DAC on ± 5V Supply
TC VOS Distribution, Industrial Grade
5V
5V
PERCENT OF UNITS (%)
1.65k
+
LT1881
–
LT1634
4.096V
–5V
R1
RCOM
REF
ROFS
33pF
5V
DAC
–
LT1881
LTC®1597
+
26
24
22
20
18
16
14
12
10
8
6
4
2
0
VOUT
–4.096V
TO 4.096V
VS = ±15V
40 N8 (1 LOT)
144 S8 (2 LOTS)
184 TOTAL PARTS
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
–5V
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
A
B
14 OUT D
OUT A 1
8
V+
–IN A 2
7
OUT B
+IN A 3
6
5
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
D
+IN B 5
+IN B
13 –IN D
12 +IN D
V+ 4
–IN B
V– 4
A
11 V –
B
C
10 +IN C
–IN B 6
9
–IN C
OUT B 7
8
OUT C
TJMAX = 150°C, θJA = 130°C/W (N8)
TJMAX = 150°C, θJA = 190°C/W (S8)
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 160°C/W
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 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/
2
18812fb
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
SYMBOL PARAMETER
VOS
CONDITIONS
MIN
Input Offset Voltage (LT1881A)
0°C < TA < 70°C
– 40°C < TA < 85°C
l
l
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°C < TA < 70°C
– 40°C < TA < 85°C
– 40°C < TA < 125°C
– 55°C < TA < 125°C
l
l
l
l
Input Offset Voltage (LT1881/LT1882)
ΔVOS /ΔT Input Offset Voltage Drift
(Note 6)
ΔVOS /
ΔTIME
Long-Term Input Offset
Voltage Stability
IOS
Input Offset Current (LT1881A)
MAX
25
50
85
110
30
80
125
150
0.3
0.3
MIN
l
l
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°C < TA < 70°C
– 40°C < TA < 85°C
l
l
0°C < TA < 70°C
– 40°C < TA < 85°C
– 40°C < TA < 125°C
– 55°C < TA < 125°C
l
l
l
l
MAX
30
80
300
300
μV
μV
μV
μV
μV
0.8
0.8
μV/°C
μV/°C
μV/°C
μV/°C
0.8
0.8
0.3
100
200
250
300
150
500
600
700
μV/month
pA
pA
pA
150
500
2000
2000
Input Bias Current (LT1881A)
Input Bias Current (LT1881/LT1882)
100
200
250
300
150
500
600
700
UNITS
μV
μV
μV
0.3
0°C < TA < 70°C
– 40°C < TA < 85°C
TYP
0.3
0.3
Input Offset Current (LT1881/LT1882)
IB
H/MP Grades
TYP
pA
pA
pA
pA
pA
pA
pA
pA
150
500
3000
3000
pA
pA
pA
pA
pA
Input Noise Voltage
0.1Hz to 10Hz
0.5
0.5
μVP-P
en
Input Noise Voltage Density
f = 1kHz
14
14
nV/√Hz
in
Input Noise Current Density
f = 1kHz
RIN
Input Resistance
Differential Mode
Common Mode
0.03
0.03
pA/√Hz
l
l
20
100
20
100
MΩ
GΩ
2
CIN
Input Capacitance
l
VCM
Input Voltage Range
V – + 1.0
l V – + 1.2
CMRR
Common Mode Rejection Ratio
PSRR
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
1V < VCM < 4V
1.2V < VCM < 3.8V
l
V – = 0V, VCM = 1.5V
0°C < TA < 85°C, 2.7V < V+ < 32V l
0°C < TA < 125°C, 2.7V < V+ < 32V l
TA = –40°C, 3V < V+ < 32V
TA = –55°C, 3V < V+ < 32V
l
106
104
2
V+ – 1.0 V – + 1.0
V+ – 1.2 V – + 1.2
128
106
102
pF
V+ – 1.0
V+ – 1.2
128
dB
dB
dB
dB
dB
dB
106
106
106
106
2.4
2.7
V
V
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
SYMBOL PARAMETER
AVOL
Large-Signal Voltage Gain
CONDITIONS
RL = 10k; 1V < VOUT < 4V
RL = 2k; 1V < VOUT < 4V
RL = 1k; 1V < VOUT < 4V
MIN
TYP
l
500
350
l
l
H/MP Grades
MAX
MIN
TYP
MAX
UNITS
1600
500
300
1600
V/mV
V/mV
300
250
800
300
200
800
V/mV
V/mV
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
IS
Supply Current Per Amplifier
VS = 3V, 0V
0.45
0.65
0.85
1.2
0.45
0.65
0.85
1.5
mA
mA
0.5
0.65
0.9
1.4
0.5
0.65
0.9
1.7
mA
mA
0.5
0.70
1.0
1.5
0.5
0.70
1.0
1.8
mA
mA
15
15
30
30
10
10
30
30
mA
mA
0.35
1.0
0.35
1.0
MHz
VS = 5V, 0V
VS = 12V, 0V
ISC
Short-Circuit Current
VOUT Short to GND
VOUT Short to V +
GBW
Gain Bandwidth Product
f = 20kHz
l
l
l
l
l
Channel Separation
f = 1kHz
120
120
dB
tS
Settling Time
0.01%, VOUT = 1.5V to 3.5V,
AV = –1, RL = 2k
30
30
μs
SR +
Slew Rate Positive
AV = –1
SR –
FPBW
ΔVOS
ΔIB+
0.15
0.12
0.35
0.15
0.1
0.35
l
V/μs
V/μs
0.11
0.08
0.18
0.11
0.06
0.18
l
V/μs
V/μs
VOUT = 4VP-P
(Note 10)
8.75
6.35
14
8.75
4.75
14
l
kHz
kHz
Offset Voltage Match
(LT1881A)
(Note 7)
0°C < TA < 70°C
– 40°C < TA < 85°C
l
l
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
Offset Voltage Match Drift
(Notes 6, 7)
l
Noninverting Bias Current Match
(LT1881A)
(Note 7)
0°C < TA < 70°C
– 40°C < TA < 85°C
l
l
Slew Rate Negative
Full-Power Bandwidth
AV = –1
30
70
125
160
35
125
175
235
0.4
1.2
200
300
400
500
μV
μV
μV
35
0.4
125
385
385
μV
μV
μV
μV
μV
1.2
μV/°C
pA
pA
pA
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
SYMBOL PARAMETER
CONDITIONS
ΔIB+
(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
l
Noninverting Bias Current Match
(LT1881/LT1882)
MIN
ΔCMRR
Common Mode Rejection Ratio
Match
(Notes 7, 9)
ΔPSRR
Power Supply Rejection Match
(Notes 7, 9)
V – = 0V, VCM = 1.5V
0°C < TA < 85°C, 2.7V < V+ < 32V l
0°C < TA < 125°C, 2.7V < V+ < 32V l
TA = –40°C, 3V < V+ < 32V
TA = –55°C, 3V < V+ < 32V
H/MP Grades
TYP
MAX
250
700
900
1000
MIN
TYP
MAX
UNITS
250
700
pA
pA
pA
pA
pA
2000
2000
102
125
104
126
104
100
125
102
126
102
126
dB
dB
dB
dB
dB
126
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
SYMBOL
PARAMETER
VOS
Input Offset Voltage
(LT1881A)
Input Offset Voltage
(LT1881/LT1882)
ΔVOS /ΔT
Input Offset Voltage Drift
(Note 6)
ΔVOS /
ΔTIME
Long-Term Input Offset
Voltage Stability
IOS
Input Offset Current (LT1881A)
Input Offset Current
(LT1881/LT1882)
IB
CONDITIONS
MIN
0°C < TA < 70°C
– 40°C < TA < 85°C
l
l
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°C < TA < 70°C
– 40°C < TA < 85°C
– 40°C < TA < 125°C
– 55°C < TA < 125°C
l
l
l
l
TYP
MAX
25
50
85
110
30
80
125
150
0.3
0.3
0°C < TA < 70°C
– 40°C < TA < 85°C
l
l
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°C < TA < 70°C
– 40°C < TA < 85°C
l
l
0°C < TA < 70°C
– 40°C < TA < 85°C
– 40°C < TA < 125°C
– 55°C < TA < 125°C
l
l
l
l
MIN
TYP
MAX
30
0.3
0.3
80
300
300
μV
μV
μV
μV
μV
0.8
0.8
μV/°C
μV/°C
μV/°C
μV/°C
0.3
100
200
250
300
150
500
600
700
μV/month
pA
pA
pA
150
500
2000
2000
100
200
250
300
150
500
600
700
UNITS
μV
μV
μV
0.8
0.8
0.3
Input Bias Current (LT1881A)
Input Bias Current
(LT1881/LT1882)
H/MP Grades
pA
pA
pA
pA
pA
pA
pA
pA
150
500
3000
3000
pA
pA
pA
pA
pA
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
SYMBOL
PARAMETER
CONDITIONS
Input Noise Voltage
0.1Hz to 10Hz
0.5
0.5
μVP-P
en
Input Noise Voltage Density
f = 1kHz
14
14
nV/√Hz
in
Input Noise Current Density
f = 1kHz
Differential Mode
Common Mode
MIN
TYP
H/MP Grades
MAX
MIN
TYP
MAX
UNITS
0.03
0.03
pA/√Hz
l
l
20
100
20
100
MΩ
GΩ
2
RIN
Input Resistance
CIN
Input Capacitance
l
VCM
Input Voltage Range
V – + 1.0
l V – + 1.2
CMRR
Common Mode Rejection Ratio
–13.5V < VCM < 13.5V
l
114
130
110
130
dB
+PSRR
Positive Power Supply
Rejection Ratio
V – = –15V, VCM = 0V;
1.5V < V + < 18V
l
110
132
108
132
dB
–PSRR
Negative Power Supply
Rejection Ratio
V + = 15V, VCM = 0V;
–1.5V < V – < –18V
l
106
132
104
132
dB
l
Minimum Operating
Supply Voltage
AVOL
Large-Signal Voltage Gain
RL = 10k; –13.5V < VOUT < 13.5V
RL = 2k; –13.5V < VOUT < 4V
RL = 1k; 1V < VOUT < 4V
2
V + – 1.0 V – + 1.0
V + – 1.2 V – + 1.2
±1.2
±1.35
pF
V + – 1.0
V + – 1.2
±1.2
±1.35
V
V
V
1000
700
1600
1000
500
1600
l
V/mV
V/mV
175
125
420
175
110
420
l
V/mV
V/mV
90
65
230
90
7
230
l
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
IS
Supply Current Per Amplifier
VS = ±15V
0.5
0.85
1.1
1.6
0.5
0.85
1.1
2.0
mA
mA
ISC
Short-Circuit Current
l
20
15
40
40
20
10
40
40
mA
mA
l
20
15
30
30
20
10
30
30
mA
mA
0.4
0.85
0.4
0.85
MHz
VOUT Short to V –
VOUT Short to V +
GBW
l
Gain Bandwidth Product
f = 20kHz
Channel Separation
f = 1kHz
120
120
dB
tS
Settling Time
0.01%, VOUT = – 5V to 5V,
AV = –1, RL = 2k
30
30
μs
SR +
Slew Rate Positive
AV = –1
SR –
Slew Rate Negative
AV = –1
0.21
0.18
0.4
0.21
0.15
0.4
l
V/μs
V/μs
0.13
0.1
0.20
0.11
0.07
0.20
l
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
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
FPBW
Full-Power Bandwidth
VOUT = 28VP-P
(Note 10)
2.25
l
1.47
1.13
Offset Voltage Match
(LT1881A)
(Note 7)
0°C < TA < 70°C
– 40°C < TA < 85°C
l
l
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
Offset Voltage Match Drift
(Notes 6, 7)
l
ΔIB+
Noninverting Bias Current Match
(LT1881A)
(Note 7)
0°C < TA < 70°C
– 40°C < TA < 85°C
l
l
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
ΔVOS
H/MP Grades
MAX
35
70
125
160
42
125
175
235
0.4
1.1
200
300
400
500
250
700
900
1000
MIN
TYP
1.47
0.79
2.25
MAX
UNITS
kHz
kHz
μV
μV
μV
42
0.4
125
435
435
μV
μV
μV
μV
μV
1.1
μV/°C
pA
pA
pA
250
700
2000
2000
pA
pA
pA
pA
pA
ΔCMRR
Common Mode Rejection Match
(Notes 7, 9)
l
110
125
106
125
dB
Δ+PSRR
Positive Power Supply
Rejection Ratio Match
V – = – 15V, VCM = 0V,
1.5V < V + < 18V, (Notes 7, 9)
l
108
130
108
130
dB
Δ–PSRR
Negative Power Supply
Rejection Ratio Match
V+ = 15V, VCM = 0V,
– 1.5V < V – < – 18V, (Notes 7, 9)
l
104
130
104
130
dB
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 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.
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 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 10: Full power bandwidth is calculated from the slew rate: FPBW =
SR/2πVP.
18812fb
7
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current per Amplifier
vs Supply Voltage
Slew Rate vs Supply Voltage
AV = –1
AV = –1
RISING
25°C
600
–55°C
400
SLEW RATE (V/μs)
800
VS = ±15V
RISING
0.4
0.35
SLEW RATE (V/μs)
SUPPLY CURRENT PER AMPLIFIER (μA)
0.5
0.40
125°C
1000
0.30
0.25
FALLING
0.20
0.15
0.10
VS = ±5V
0.3
VS = ±15V
FALLING
VS = ±5V
0.2
0.1
200
0.05
0
0
4
8 12 16 20 24 28
TOTAL SUPPLY VOLTAGE (V)
32
0
36
0
4
8 12 16 20 24 28 32
TOTAL SUPPLY VOLTAGE (V)
Settling Time vs Output Step
900
VS = ±15V
AV = 1
8
6
0.1%
0.01%
OUTPUT STEP (V)
4
2
0
–2
–4
0.1%
0.01%
4
0.01%
2
0
–2
0.1%
0.01%
–4
–6
–6
–8
–8
–10
0 5 10 15 20 25 30 35 40 45 50 55 60 65
SETTLING TIME (μs)
0.1%
GAIN BANDWIDTH PRODUCT (kHz)
6
25 50 75 100 125 150
TEMPERATURE (°C)
Gain Bandwidth Product
vs Supply Voltage
10
VS = ±15V
AV = –1
8
0
18812 G03
Settling Time vs Output Step
10
–10
0
–50 –25
36
18812 G02
18812 G01
OUTPUT STEP (V)
Slew Rate vs Temperature
0.45
1200
125°C
800
25°C
750
–55°C
700
650
600
0 5 10 15 20 25 30 35 40 45 50 55 60 65
SETTLING TIME (μs)
18812 G04
850
0
4
8 12 16 20 24 28 32
TOTAL SUPPLY VOLTAGE (V)
18812 G06
18812 G05
Phase Margin vs Supply Voltage
Gain vs Frequency, AV = –1
60
36
Gain vs Frequency, AV = 1
10
10
0
0
–10
–10
–55°C
125°C
54
125°C
52
GAIN (dB)
56
GAIN (dB)
PHASE MARGIN (DEG)
58
–20
VS = ±2.5V
50
VS = ±2.5V
VS = ±15V
–20
VS = ±15V
–30
–30
48
46
0
4
8 12 16 20 24 28 32
TOTAL SUPPLY VOLTAGE (V)
36
18812 G07
–40
1k
10k
100k
1M
FREQUENCY (Hz)
10M
100M
18812 G08
–40
1k
10k
100k
1M
FREQUENCY (Hz)
10M
100M
18812 G09
18812fb
8
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
Gain vs Frequency with CLOAD,
AV = –1
Gain vs Frequency with CLOAD,
AV = 1
10
10
VS = ±15V
VS = ±15V
0
0
1500pF
1800pF
–10
GAIN (dB)
GAIN (dB)
1000pF
500pF
–20
–10
1000pF
–20
500pF
0pF
–30
–40
–30
1k
10k
100k
1M
FREQUENCY (Hz)
10M
100M
–40
0pF
1k
10k
100k
1M
FREQUENCY (Hz)
18812 G10
TIME (50μs/DIV)
18812 G12
18812 G13
TIME (2μs/DIV)
Small Signal Response, AV = 1,
RL = 2k
18812 G15
18812 G14
Small Signal Response, AV = 1,
CL = 500pF
VOUT (20mV/DIV)
VOUT (20mV/DIV)
VOUT (20mV/DIV)
Small Signal Response, AV = –1,
CL = 1000pF
TIME (2μs/DIV)
Small Signal Response, AV = –1,
No Load
Large Signal Response, AV = 1
VOUT (20mV/DIV)
VOUT (5V/DIV)
TIME (50μs/DIV)
100M
18812 G11
VOUT (5V/DIV)
Large Signal Response, AV = –1
10M
TIME (2μs/DIV)
18812 G16
TIME (2μs/DIV)
18812 G17
18812fb
9
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
VOS Distribution, TA = 25°C
Voltage Offset vs Temperature
200
VS = ±15V
VS = ±15V
0
OFFSET VOLTAGE DRIFT (μV)
40 N8 (1 LOT)
144 S8 (2 LOTS)
184 TOTAL PARTS
100
50
0
–50
–100
–60
0
20
40
–40 –20
OUTPUT OFFSET VOLTAGE (μV)
–200
–55 –35 –15
60
1400
200
0
200
400
V+ – 0
VS = ±15V
1000
800
600
400
–IBIAS
200
+IBIAS
600
0
800
10
15
–200
–55 –35 –15
20
VCM (V)
V – + 0.8
V – + 0.6
V – + 0.4
VS = ±5V
$VOS <1mV
2
1
0
–1
–2
–3
V– + 0
0
V
+ – 0.5
V
+ – 1.0
RL = 2k
AV = –1
TA = 25°C
V – + 1.0
V
RL = 2k
– + 0.5
RL = 10k
18812 G24
4
6
8
10 12
SUPPLY VOLTAGE (±V)
0
2
4
14
16
Output Saturation Voltage
vs Load Current (Output High)
V– + 0
5 25 45 65 85 105 125
TEMPERATURE (°C)
2
85°C
125°C
18812 G23
1
LOWER LIMIT
–5
–55 –35 –15
–55°C
–40°C
25°C
V – + 0.2
RL = 10k
OUTPUT VOLTAGE SWING (V)
INPUT COMMON MODE LIMIT (V)
V+ – 0.8
V+ – 0
3
–4
V+ – 0.6
Output Voltage Swing
vs Supply Voltage
5
140
V+ – 0.4
18812 G22
Input Common Mode Range
vs Temperature
UPPER LIMIT
40
60
80 100 120
TIME AFTER POWER UP (s)
$VOS ≤ 1mV
V+ – 0.2
5 25 45 65 85 105 125
TEMPERATURE (°C)
18812 G21
4
20
0
Input Common Mode Range
vs Supply Voltage
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (±V)
18812 G25
OUTPUT SATURATION VOLTAGE (V)
IBIAS (pA)
400
5
S8 VS = 5V, ±15V
18812 G20
INPUT COMMON MODE RANGE (V)
INPUT BIAS CURRENT (pA)
600
0
N8 VS = ±15V
–20
–30
5 25 45 65 85 105 125
TEMPERATURE (°C)
1200
–5
–15
Input Bias Current vs Temperature
VS = ±15V
1000
–20 –15 –10
–10
18812 G19
Input Bias Current
vs Common Mode Voltage
800
N8 VS = 5V
–5
–25
–150
18812 G18
1000
Warm-Up Drift vs Time
5
150
VOLTAGE OFFSET (μV)
PERCENT OF UNITS (%)
26
24
22
20
18
16
14
12
10
8
6
4
2
0
VS = ±15V
VOVERDRIVE = 30mV
0.1
0.01
0.001
TA = –55°C
TA = –40°C
TA = 25°C
TA = 85°C
TA = 125°C
0.01
0.1
1
SOURCING LOAD CURRENT (mA)
10
18812 G26
18812fb
10
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
1
0.1
TA = –55°C
TA = –40°C
TA = 25°C
TA = 85°C
TA = 125°C
0.01
0.001
0.001
0.01
0.1
1
SINKING LOAD CURRENT (mA)
10
60
56
52
48
44
40
36
32
28
24
20
16
12
8
4
0
–55 –35 –15
GND
VIN
SINKING
VOUT
18812 G28
Open-Loop Gain and Phase
vs Frequency
VS = ±15V
175
VS = ±5V
LOOP GAIN (dB)
60
50
120
40
100
30
20
50
10
25
LOOP GAIN
0
–10
–25
–20
–50
–30
1k
10 100 1k 10k 100k 1M 10M100M
FREQUENCY (Hz)
75
PHASE
0
–20
10k
–100
–140
10
VS = ±15V
VS = ±2.5V
VS = ±2.5V
OUTPUT IMPEDANCE (Ω)
660
620
5 25 45 65 85 105 125
TEMPERATURE (°C)
18812 G33
1k
10k 100k 1M
FREQUENCY (Hz)
10
1
AV = 10
0.1
AV = 1
0.001
100
1k
10k
FREQUENCY (Hz)
100k
18812 G34
10M 100M
PSRR vs Frequency
AV = 100
0.01
580
100
18812 G32
100
560
–55 –35 –15
–80
Output Impedance vs Frequency
680
600
–60
–120
–100
10M
100k
1M
FREQUENCY (Hz)
–40
18812 G31
Gain Bandwidth Product
vs Temperature
640
VS = ±15V
AV = 10
150
18812 G30
GAIN BANDWIDTH PRODUCT (kHz)
Channel Separation vs Frequency
70
PHASE (DEG)
LOOP GAIN (dB)
Open-Loop Gain vs Frequency
1
18812 G29
AV = 1
VS = ±2.5V
VIN = ±5V
RIN = 10k
5 25 45 65 85 105 125
TEMPERATURE (°C)
18812 G27
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
–10
–20
0.1
GND
SOURCING
CHANNEL SEPARATION (dB)
VS = ±15V
VOVERDRIVE = 30mV
Output Voltage
vs Large Input Voltage
PSSR (dB)
OUTPUT SATURATION VOLTAGE (V)
10
Output Short-Circuit Current
vs Temperature
OUTPUT SHORT-CIRCUIT CURRENT (mA)
Output Saturation Voltage
vs Load Current (Output Low)
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
–10
VS = ±15V
–PSSR
+PSSR
1
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
18812 G35
18812fb
11
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
Common Mode Rejection Ratio
vs Frequency
0.1Hz to 10Hz Noise
Noise Voltage vs Frequency
120
NOISE VOLTAGE (0.2μV/DIV)
100
80
CMRR (dB)
NOISE VOLTAGE DENSITY (nV/VHz)
50
60
40
20
1
10
100 1k 10k 100k
FREQUENCY (Hz)
1M
0
5
10
15
1s/DIV
20
1881/2 G36
120
100
80
60
40
20
0
10
100
FREQUENCY (Hz)
5
10
40
20
0
2000
4000
6000
8000
CAPACITIVE LOAD (pF)
10000
1881/2 G42
VS = ±15V
RL = 10k
AV = 1
15
AV = –1
10
5
10
100
1k
RS (Ω)
10k
100k
0
10
1M
100
1k
CAPACITIVE LOAD (pF)
18812 G40
THD + Noise vs Frequency
10
30
20
15
AV = –1
TA = 25°C
VS = ±2.5V
10
5
VS = ±15V
VIN = 2VP-P
1
AV = –1
TA = 25°C
VS = ±15V
25
10k
18812 G41
35
60
1k
20
Undistorted Output Swing
vs Frequency
VS = ±2.5V
10
100
FREQUENCY (Hz)
Overshoot vs Capacitive Load
100
1
PEAK-TO-PEAK OUTPUT VOLTAGE (V)
SERIES OUTPUT RESISTANCE (Ω)
10
18812 G38
1
1000
VS = ±15V
0
15
25
Series Output Resistance
vs Capacitive Load
80
20
30
18812 G39
100
25
1
OVERSHOOT (%)
140
AV = 1
TA = 25°C
30
0
30
1000
TOTAL INPUT REFERRED NOISE (nV/√Hz)
NOISE CURRENT DENSITY (fA/√Hz)
VS = ±15V
120
35
Total Noise vs Source Resistance
160
1
40
18812 G37
Noise Current Density
vs Frequency
180
25
THD + NOISE (%)
0
0.1
VS = ±5V
AV = 1
45
0.1
0.01
AV = –1
0.001
AV = 1
0
1
10
FREQUENCY (kHz)
100
18812 G43
0.0001
10
100
1k
10k
FREQUENCY (Hz)
100k
18812 G44
18812fb
12
LT1881/LT1882
TYPICAL PERFORMANCE CHARACTERISTICS
Total Harmonic Distortion + Noise
vs Output Voltage Amplitude
Open-Loop Gain
CHANGE IN INPUT OFFSET VOLTAGE
(20μV/DIV)
10
f = 1kHz
RF = RG = 10k
AV = –1
VS = ±2.5V
THD + NOISE (%)
1
AV = –1
VS = ±15V
0.1
AV = 2
VS = ±2.5V
0.01
0.001
10m
RL = 2k
RL = 10k
RL = 50k
18812 G46
OUTPUT VOLTAGE (5V/DIV)
AV = 2
VS = ±15V
0.1
1
10
OUTPUT VOLTAGE AMPLITUDE (VP-P)
100
18812 G45
Settling Time/Output Step 0.01%
Settling Time/Output Step 0.01%
GND
10V
10V
GND
0.5mV/DIV
0.5mV/DIV
AV = 1
VS = ±15V
20μs/DIV
18812 G47
AV = 1
VS = ±15V
Gain vs Temperature
6.0
VS = ±5V
18812 G48
50μs/DIV
Gain vs Load Resistance
10.0
0V TO 10V
0V TO –10V
+AVOL (0V TO 10V)
5.0
–AVOL (0V TO –10V)
3.0
RL = 10k
GAIN (V/μV)
GAIN (V/μV)
4.0
1.0
2.0
1.0
RL = 2k
VS = ±15V
0
–60 –40 –20 0 20 40 60 80 100 120 130
TEMPERATURE (°C)
18812 G49
0.1
0
5
10
15
20
25
LOAD RESISTANCE (kΩ)
30
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
load driving capabilities over the LT1884 and LT1885 in low
voltage gain configurations. Offset voltages are trimmed to
less than 50μV and input bias currents are less than 200pA
on the “A” grade devices. Obtaining beneficial 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 amplifier’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 specification 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 amplifiers. 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 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.
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 amplifier. 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 amplifier is used in higher gain configurations.
Capacitive load driving may be increased by decoupling
the capacitance from the output with a small resistance.
18812fb
14
LT1881/LT1882
PACKAGE DESCRIPTION
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
.255 ± .015*
(6.477 ± 0.381)
.300 – .325
(7.620 – 8.255)
.008 – .015
(0.203 – 0.381)
+.035
.325 –.015
(
8.255
+0.889
–0.381
)
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.065
(1.651)
TYP
.100
(2.54)
BSC
.120
.020
(3.048)
MIN
(0.508)
MIN
.018 ± .003
(0.457 ± 0.076)
N8 1002
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)
18812fb
15
LT1881/LT1882
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.050 BSC
8
.245
MIN
7
6
5
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
s 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
INCHES
(MILLIMETERS)
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)
2
3
4
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
SO8 0303
18812fb
16
LT1881/LT1882
PACKAGE DESCRIPTION
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
.337 – .344
(8.560 – 8.738)
NOTE 3
.045 ±.005
.050 BSC
14
N
12
11
10
9
8
N
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
1
.030 ±.005
TYP
13
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
1
.010 – .020
s 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
2
3
4
5
6
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
.014 – .019
(0.355 – 0.483)
TYP
7
.050
(1.270)
BSC
INCHES
(MILLIMETERS)
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)
S14 0502
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.
17
LT1881/LT1882
TYPICAL APPLICATION
–50°C to 600°C Digital Thermometer Operates on 3.3V
VCC = 3.3V
RF
1k
R1
4k
R2
4k
VCC
–
RT
VCC
R3
1k
A2
1/2 LT1881
A1
1/2 LT1881
+
10k
0.1%
VCC
+IN
CLK
–IN
+
GND
–
10k
0.1%
VREF
LTC1287
1μF
DOUT
CS/SHDN
V
V = CC + 1.588mV/°C
2
RT: OMEGA F4132 1000Ω RTD
R1, R2, R3, RF: USE BI 698-3 2k s 8 RESISTOR NETWORK
18812 TA02
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1112/LT1114
Dual/Quad Picoamp Input Op Amps
VOS = 60μV Max
LT1167
Gain Programmable Instrumentation Amp
Gain Error = 0.08% Max
LT1677
Low Noise, Rail-to-Rail Precision Op Amp
en = 3.2nV/√Hz
LT1793
Low Noise JFET Op Amp
IB = 10pA Max
LT1880
SOT-23 Picoamp Input Precision Op Amp
150μV Max VOS , – 40°C to 85°C Operation Guaranteed, SOT-23 Package
LT1884/LT1885
Dual/Quad Picoamp Input Op Amps
3 Times Faster than LT1881/LT1882
LTC2050
Zero Drift Op Amp in SOT-23
VOS = 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
IB = 1pA Max, VOS = 70μV Max
18812fb
18 Linear Technology Corporation
LT 0809 REV B • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
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© LINEAR TECHNOLOGY CORPORATION 2000