LT1881AIN8#TRPBF [Linear]
IC DUAL OP-AMP, 110 uV OFFSET-MAX, 0.85 MHz BAND WIDTH, PDIP8, 0.300 INCH, PLASTIC, DIP-8, Operational Amplifier;
| 型号： | LT1881AIN8#TRPBF |
| 厂家： | 
Linear |
| 描述： | IC DUAL OP-AMP, 110 uV OFFSET-MAX, 0.85 MHz BAND WIDTH, PDIP8, 0.300 INCH, PLASTIC, DIP-8, Operational Amplifier 运算放大器 放大器电路 光电二极管 |
| 文件： | 总16页 (文件大小：559K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1881/LT1882
Dual and Quad
Rail-to-Rail Output,
Picoamp Input Precision Op Amps
U
DESCRIPTIO
FEATURES
The LT®1881 and LT1882 op amps bring high accuracy
■
Offset Voltage: 50μV Maximum (LT1881A)
Input Bias Current: 200pA Maximum (LT1881A)
Offset Voltage Drift: 0.8μV/°C Maximum
Rail-to-Rail Output Swing
■
■
■
■
■
■
■
■
■
input performance to amplifiers with rail-to-rail output
swing. Input bias currents and capacitive load driving
capabilitiesaresuperiortothesimilarLT1884andLT1885
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.
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
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.
U
APPLICATIO S
■
Thermocouple Amplifiers
Bridge Transducer Conditioners
Instrumentation Amplifiers
Battery-Powered Systems
■
■
Capacitive loads up to 1000pF can be driven directly in
unity-gain follower applications.
■
■
Photo Current Amplifiers
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.
U
TYPICAL APPLICATIO
TC VOS Distribution, Industrial Grade
16-Bit Voltage Output DAC on 5V Supply
5V
26
24
22
20
18
16
14
12
10
8
V
= 15V
S
5V
40 N8 (1 LOT)
144 S8 (2 LOTS)
184 TOTAL PARTS
1.65k
+
LT1881
–
LT1634
4.096V
–5V
6
4
2
0
R1
R
REF
R
OFS
COM
33pF
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
5V
LT1881
–5V
INPUT OFFSET VOLTAGE DRIFT (μV/°C)
DAC
–
+
1881/2 TA01a
V
OUT
–4.096V
TO 4.096V
LTC®1597
1881/2 TA01
18812fa
1
LT1881/LT1882
W W U W
(Note 1)
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
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
U
W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
ORDER PART NUMBER
ORDER PART NUMBER
+
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
14
13
12
11
10
9
OUT A
–IN A
+IN A
1
2
3
4
5
6
7
OUT D
–IN D
+IN D
LT1881CN8
LT1881IN8
LT1881CS8
LT1881IS8
LT1881ACN8
LT1881AIN8
LT1881ACS8
LT1881AIS8
LT1882CS
LT1882IS
OUT B
–IN B
+IN B
A
B
D
C
A
B
+
–
V
V
–
V
+IN B
–IN B
OUT B
+IN C
–IN C
OUT C
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
8
TJMAX = 150°C, θJA = 130°C/W (N8)
JMAX = 150°C, θJA = 190°C/W (S8)
T
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/W
S8 PART MARKING
1881
1881I
1881A
1881AI
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/
Consult LTC marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● 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)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage (LT1881A)
25
50
85
110
μV
μV
μV
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Offset Voltage (LT1881/LT1882)
30
80
125
150
μV
μV
μV
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
ΔV /ΔT
OS
Input Offset Voltage Drift
(Note 6)
0°C < T < 70°C
●
●
0.3
0.3
0.8
0.8
μV/°C
μV/°C
A
–40°C < T < 85°C
A
ΔV /ΔTIME Long-Term Input Offset Voltage Stability
OS
0.3
μV/month
I
Input Offset Current (LT1881A)
100
200
250
300
pA
pA
pA
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Offset Current (LT1881/LT1882)
150
500
600
700
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
18812fa
2
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
The ● 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)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Input Bias Current (LT1881A)
100
200
250
300
pA
pA
pA
B
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Bias Current (LT1881/LT1882)
150
500
600
700
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
0.5
14
μV
P-P
e
i
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
nV/√Hz
pA/√Hz
n
f = 1kHz
0.03
n
R
IN
Differential Mode
Common Mode
●
●
20
100
MΩ
GΩ
C
V
Input Capacitance
●
●
●
●
●
●
●
●
2
pF
IN
–
+
Input Voltage Range
V + 1.0
V – 1.0
V
V
CM
–
+
V + 1.2
V – 1.2
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
1V < V < 4V
106
104
128
dB
dB
CM
1.2V < V < 3.8V
CM
–
V = 0V, V = 1.5V
CM
+
0°C < T < 85°C, 2.7V < V < 32V
106
106
132
132
dB
dB
A
+
T = –40°C, 3V < V < 32V
A
Minimum Operating Supply Voltage
Large-Signal Voltage Gain
2.4
2.7
V
A
R = 10k; 1V < V < 4V
L OUT
500
350
1600
V/mV
V/mV
VOL
R = 2k; 1V < V
L
< 4V
300
250
800
400
V/mV
V/mV
OUT
OUT
R = 1k; 1V < V
L
< 4V
250
200
V/mV
V/mV
V
V
Output Voltage Swing Low
Output Voltage Swing High
No Load
●
●
●
●
20
25
70
40
50
150
mV
mV
mV
mV
OL
OH
I
I
I
= 100μA
= 1mA
= 5mA
SINK
SINK
SINK
270
600
No Load
●
●
●
●
120
130
180
360
220
230
300
600
mV
mV
mV
mV
+
(Referred to V )
I
I
I
= 100μA
= 1mA
= 5mA
SOURCE
SOURCE
SOURCE
I
Supply Current Per Amplifier
V = 3V, 0V
0.45
0.5
0.65
0.65
0.70
0.85
1.2
mA
mA
S
S
●
●
●
V = 5V, 0V
S
0.9
1.4
mA
mA
V = 12V, 0V
S
0.5
1.0
1.5
mA
mA
I
Short-Circuit Current
V
V
Short to GND
Short to V
●
●
15
15
30
30
mA
mA
SC
OUT
OUT
+
GBW
Gain Bandwidth Product
Channel Separation
Settling Time
f = 20kHz
f = 1kHz
0.01%, V
0.35
1.0
120
30
MHz
dB
t
= 1.5V to 3.5V,
OUT
μs
S
A = –1, R = 2k
V
L
18812fa
3
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
The ● 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)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
+
SR
Slew Rate Positive
A = –1
0.15
0.12
0.35
V/μs
V/μs
V
●
●
●
–
SR
Slew Rate Negative
A = –1
V
0.11
0.08
0.18
14
V/μs
V/μs
FPBW
Full-Power Bandwidth
V
= 4V
8.75
6.35
kHz
kHz
OUT
P-P
(Note 10)
ΔV
OS
Offset Voltage Match (LT1881A)
(Note 7)
30
70
125
160
μV
μV
μV
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Offset Voltage Match (LT1881/LT1882)
(Note 7)
35
125
175
235
μV
μV
μV
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Offset Voltage Match Drift
(Notes 6, 7)
●
0.4
1.2
μV/°C
ΔI +
B
Noninverting Bias Current Match
(LT1881A)
(Notes 7, 8)
200
300
400
500
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Noninverting Bias Current Match
(LT1881/LT1882)
(Notes 7, 8)
250
125
700
900
1000
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
ΔCMRR
ΔPSRR
Common Mode Rejection Match
(Notes 7, 9)
●
102
dB
–
Power Supply Rejection Match
(Notes 7, 9)
V = 0V, V = 1.5V
CM
+
0°C < T < 85°C, 2.7V < V < 32V
T = –40°C, 3V < V < 32V
A
●
104
104
126
126
dB
dB
A
+
The ● 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)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage (LT1881A)
25
50
85
110
μV
μV
μV
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Offset Voltage (LT1881/LT1882)
30
80
125
150
μV
μV
μV
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
ΔV /ΔT
OS
Input Offset Voltage Drift
(Note 6)
0°C < T < 70°C
●
●
0.3
0.3
0.8
0.8
μV/°C
μV/°C
A
–40°C < T < 85°C
A
ΔV /ΔTIME Long-Term Input Offset Voltage Stability
OS
0.3
μV/month
I
Input Offset Current (LT1881A)
150
200
250
300
pA
pA
pA
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Offset Current (LT1881/LT1882)
150
500
600
700
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
18812fa
4
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
The ● 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)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Input Bias Current (LT1881A)
150
200
250
300
pA
pA
pA
B
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Bias Current (LT1881/LT1882)
150
500
600
700
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
0.5
14
μV
P-P
e
i
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
nV/√Hz
pA/√Hz
n
f = 1kHz
0.03
n
R
IN
Differential Mode
Common Mode
●
●
20
100
MΩ
GΩ
C
V
Input Capacitance
●
2
pF
IN
–
+
Input Voltage Range
V + 1.0
V – 1.0
V
V
CM
–
+
●
●
●
●
●
V + 1.2
V – 1.2
CMRR
+PSRR
–PSRR
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 < 13.5V
114
110
106
130
132
132
1.2
dB
dB
dB
V
CM
–
+
V = –15V, V = 0V; 1.5V < V < 18V
CM
+
–
V = 15V, V = 0V; –1.5V < V < –18V
CM
1.35
A
R = 10k; –13.5V < V < 13.5V
L OUT
1000
700
1600
V/mV
V/mV
VOL
●
●
●
R = 2k; –13.5V < V
< 13.5V
175
125
420
230
V/mV
V/mV
L
OUT
R = 1k; –12V < V
L
< 12V
OUT
90
65
V/mV
V/mV
V
V
Output Voltage Swing Low
No Load
●
●
●
●
20
25
70
40
50
150
600
mV
mV
mV
mV
OL
OH
(Referred to V
)
EE
I
I
I
= 100μA
= 1mA
= 5mA
SINK
SINK
SINK
270
Output Voltage Swing High
(Referred to V
No Load
●
●
●
●
160
160
180
360
220
230
300
600
mV
mV
mV
mV
)
CC
I
I
I
= 100μA
= 1mA
= 5mA
SOURCE
SOURCE
SOURCE
I
I
Supply Current Per Amplifier
Short-Circuit Current
V = 15V
0.5
0.85
1.1
1.6
mA
mA
S
S
●
●
●
–
+
V
V
Short to V
Short to V
20
15
40
40
mA
mA
SC
OUT
OUT
20
15
30
30
mA
mA
GBW
Gain Bandwidth Product
Channel Separation
Settling Time
f = 20kHz
f = 1kHz
0.01%, V
0.4
0.85
120
35
MHz
dB
t
= –5V to 5V,
OUT
μs
S
A = –1, R = 2k
V
L
+
SR
Slew Rate Positive
A = –1
V
0.21
0.18
0.4
V/μs
V/μs
●
18812fa
5
LT1881/LT1882
ELECTRICAL CHARACTERISTICS
The ● 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)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
–
SR
Slew Rate Negative
A = –1
0.13
0.1
0.20
V/μs
V/μs
V
●
●
FPBW
Full-Power Bandwidth
V
= 28V
1.47
1.13
2.25
42
kHz
kHz
OUT
P-P
(Note 10)
ΔV
Offset Voltage Match (LT1881/LT1882)
(Note 5)
125
175
235
μV
μV
μV
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Offset Voltage Match (LT1881A)
35
70
125
160
μV
μV
μV
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Offset Voltage Match Drift
(Notes 6, 7)
●
0.4
1.1
μV/°C
ΔI +
B
Noninverting Bias Current Match
(LT1881/LT1882)
(Notes 7, 8)
240
700
900
1000
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Noninverting Bias Current Match
(LT1881A)
200
300
400
500
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
ΔCMRR
Δ+PSRR
Common Mode Rejection Match
(Notes 7, 9)
●
●
110
108
125
130
dB
dB
–
Positive Power Supply Rejection Match
V = –15V, V = 0V,
CM
+
1.5V < V < 18V, (Notes 7, 9)
+
Δ–PSRR
Negative Power Supply Rejection Match
V = 15V, V = 0V,
●
104
130
dB
CM
–
–1.5V < V < –18V, (Notes 7, 9)
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.
tested or QA sampled at these temperatures. The LT1881I and LT1882I are
guaranteed to meet specified performance from –40°C to 85°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 3: A heat sink may be required to keep the junction temperature
below absolute maximum.
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 4: The LT1881C, LT1882C, LT1881I and LT1882I are guaranteed
functional over the operating temperature range of –40°C to 85°C.
Note 5: The LT1881C and LT1882C are designed, characterized and
expected to meet specified performance from –40°C to 85°C but are not
Note 10: Full power bandwidth is calculated from the slew rate: FPBW =
SR/2πV
P.
18812fa
6
LT1881/LT1882
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current per Amplifier vs
Supply Voltage
Slew Rate vs Supply Voltage
Slew Rate vs Temperature
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0.5
0.4
0.3
0.2
0.1
0
A
= –1
V
A
= –1
A = –1
V
V
V
V
=
=
15V
5V
S
S
RISING
RISING
RISING
V
V
=
=
15V
5V
S
S
FALLING
FALLING
FALLING
0
4
8
12 16 20 24 28 32 36
0
4
8
12 16 20 24 28 32 36
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
1881/2 G03
TOTAL SUPPLY VOLTAGE (V)
TOTAL SUPPLY VOLTAGE (V)
1881/2 G02
1881/2 G02
Gain Bandwidth Product vs
Supply Voltage
Settling Time vs Output Step
Settling Time vs Output Step
10
8
10
8
900
850
800
750
700
650
600
V
A
=
15V
V
A
=
15V
S
V
S
V
= –1
= 1
6
6
125°C
4
4
0.1%
0.01%
0.1%
0.01%
2
2
25°C
0
0
–55°C
–2
–4
–6
–8
–2
–4
–6
–8
–10
0.1%
0.01%
0.1%
0.01%
–10
0
5
10 15 20 25 30 35 40 45 50 55 60 65
SETTLING TIME (μs)
0
5
10 15 20 25 30 35 40 45 50 55 60 65
SETTLING TIME (μs)
0
4
8
12 16 20 24 28 32 36
TOTAL SUPPLY VOLTAGE (V)
1881/2 G04
1881/2 G05
1881/2 G06
Phase Margin vs Supply Voltage
Gain vs Frequency, AV = –1
Gain vs Frequency, AV = 1
60
58
56
54
52
50
48
46
10
0
10
0
–55°C
–10
–20
–30
–40
–10
–20
–30
–40
125°C
125°C
V
=
2.5V
V
=
S
15V
S
V
=
2.5V
V = 15V
S
S
0
4
8
12 16 20 24 28 32 36
1k
10k
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
TOTAL SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
FREQUENCY (Hz)
1881/2 G07
1881/2 G08
1881/2 G09
18812fa
7
LT1881/LT1882
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Gain vs Frequency with CLOAD
,
Gain vs Frequency with CLOAD
,
AV = 1
AV = –1
10
0
10
0
V
S
= 15V
V
S
= 15V
1500pF
1000pF
500pF
1800pF
1000pF
500pF
0pF
–10
–20
–30
–40
–10
–20
–30
–40
0pF
1k
10k
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
1881/2 G10
1881/2 G11
Small Signal Response, AV = –1,
No Load
Large Signal Response, AV = –1
Large Signal Response, AV = 1
TIME (50μs/DIV)
1881/2 G12
TIME (50μs/DIV)
1881/2 G13
TIME (2μs/DIV)
1881/2 G14
Small Signal Response, AV = –1,
CL = 1000pF
Small Signal Response, AV = 1,
RL = 2k
Small Signal Response, AV = 1,
CL = 500pF
TIME (2μs/DIV)
1881/2 G15
TIME (2μs/DIV)
1881/2 G16
TIME (2μs/DIV)
1881/2 G17
18812fa
8
LT1881/LT1882
U W
TYPICAL PERFOR A CE CHARACTERISTICS
LT1881 VOS Distribution,
TA = 25°C
LT1881IS8 Voltage Offset vs
Temperature
Warm-Up Drift vs Time
200
150
100
50
26
24
22
20
18
16
14
12
10
8
5
0
V
= 15V
S
V
= 15V
S
40 N8 (1 LOT)
144 S8 (2 LOTS)
184 TOTAL PARTS
N8 V = 5V
S
–5
–10
–15
–20
–25
–30
0
–50
–100
–150
–200
N8 V
=
15V
S8 V = 5V, 15V
S
S
6
4
2
0
–55 –35 –15
5
25 45 65 85 105 125
0
20
40
60
80 100 120 140
–60 –40 –20
0
20
40
60
TEMPERATURE (°C)
TIME AFTER POWER UP (s)
OUTPUT OFFSET VOLTAGE (μV)
1881/2 G19
1881/2 G20
1881/2 G18
LT1881 Input Bias Current vs
Common Mode Voltage
LT1881 Input Bias Current vs
Temperature
LT1881 Input Common Mode
Range vs Supply Voltage
+
V
– 0
150
100
50
1000
85°C
V
= 15V
ΔV < 1mV
OS
V
= 15V
S
S
+
+
+
800
600
400
200
0
V
V
V
– 0.5
– 1.0
– 1.5
+I
–I
BIAS
BIAS
–40°C
–40°C
25°C
25°C
0
–
–
–
200
400
600
800
1000
V
V
V
+ 1.5
+ 1.0
+ 0.5
–50
–100
–150
85°C
–
V
+ 0
–40 –20
0
20
40
60
80
0
2
4
6
8
10 12 14 16
–20 –15 –10 –5
0
5
10 15 20
TEMPERATURE (°C)
SUPPLY VOLTAGE ( V)
V
(V)
CM
1881/2 G22
1881/2 G23
1881/2 G21
LT1881 Input Common Mode
Voltage vs Temperature
LT1881 Output Voltage Swing vs
Supply Voltage
LT1881 Output Saturation Voltage
vs Load Current (Output High)
+
1
5
4
V – 0
R
= 10k
= 2k
L
L
V
V
=
OD
15V
S
+
+
= 30mV
V
V
– 0.5
– 1.0
T
T
= 85°C
A
3
R
2
T
= 25°C
A
1
A
= –1
= 25°C
V
A
V
= 5V
0.1
0
S
T
= –40°C
A
–1
–2
–3
–4
–5
–
–
V
V
+ 1.0
+ 0.5
R
R
= 2k
L
= 10k
L
–
V
+ 0
0.01
0.001
–50 –25
0
25
50
75 100 125
0
2
4
6
8
10 12 14 16 18 20
0.01
0.1
1
10
SOURCING LOAD CURRENT (mA)
TEMPERATURE (°C)
SUPPLY VOLTAGE ( V)
1881/2 G26
1881/2 G24
1881/2 G25
18812fa
9
LT1881/LT1882
U W
TYPICAL PERFOR A CE CHARACTERISTICS
LT1881 Output Saturation Voltage
vs Load Current (Output Low)
LT1881 Output Short-Circuit
Current vs Temperature
LT1881 Output Voltage vs Large
Input Voltage
60
56
52
48
44
40
36
32
28
24
20
16
12
8
1
0.1
V
V
=
OD
15V
S
T
= 85°C
= 30mV
A
VIN
GND
GND
T
A
= 25°C
SINKING
T
= –40°C
VOUT
A
0.01
0.001
SOURCING
AV = 1
1881 G29.tif
VS
=
2.5V
5V
4
0
VIN
=
–55 –35 –15
5
25 45 65 85 105 125
RIN = 10k
0.001
0.01
0.1
1
10
TEMPERATURE (°C)
SINKING LOAD CURRENT (mA)
1881/2 G28
1881/2 G27
LT1881 Open-Loop Gain vs
Frequency
LT1881 Open-Loop Gain and
Phase vs Frequency
LT1881 Channel Separation vs
Frequency
140
130
120
110
100
90
70
60
175
–20
V
S
= 15V
V
A
=
15V
V
S
= 5V
S
V
150
120
100
75
= 10
–40
–60
50
40
80
70
30
PHASE
60
50
40
30
20
10
0
–10
–20
20
50
–80
10
25
LOOP GAIN
–100
–120
–140
0
0
–10
–20
–30
–25
–50
–100
0.1
1
10 100 1k 10k 100k 1M 10M100M
10 100 1k 10k 100k 1M 10M 100M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
1881/2 G30
1881/2 G31
1881/2 G32
Gain Bandwidth Product vs
Temperature
Output Impedance vs Frequency
LT1881 PSRR vs Frequency
100
10
140
900
850
800
750
700
650
600
550
130
120
110
100
90
V
=
15V
V
S
= 2.5V
V
= 15V
S
S
A
= 100
V
V
=
2.5V
S
1
80
70
–PSSR
A
V
= 10
60
50
40
30
20
10
0
–10
+PSSR
A
= 1
V
0.1
0.01
0.001
100
–50
–25
0
25
50
75
100
1k
10k
100k
1
10
100
1k
10k 100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
TEMPERATURE (°C)
1881/2 G34
1881/2 G35
1881/2 G33
18812fa
10
LT1881/LT1882
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Common Mode Rejection Ratio vs
Frequency
LT1881 Noise Voltage vs
Frequency
LT1881 0.1Hz to 10Hz Noise
120
100
80
60
40
20
0
50
45
40
35
30
25
20
15
10
5
V
A
=
= 1
5V
S
V
0
0.1
1
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
0
5
10
15
1s/DIV
20
25
30
1
10
100
1k
FREQUENCY (Hz)
1881/2 G36
1881/2 G37
1881/2 G38
LT1881 Noise Current Density vs
Frequency
LT1881A Total Noise vs Source
Resistance
LT1881 Overshoot vs Capacitive
Load
1000
180
160
140
120
100
80
30
V
=
15V
V
= 15V
S
L
S
R
= 10k
25
20
15
10
5
100
10
1
A
= 1
V
A
= –1
V
60
40
20
0
0
10
1
10
100
1k
(Ω)
10k 100k
1M
1
10
100
1000
100
1k
10k
R
S
FREQUENCY (Hz)
CAPACITIVE LOAD (pF)
1881/2 G36
1881/2 G39
1881/2 G41
LT1881 Series Output Resistance
vs Capacitive Load
LT1881 Undistorted Output Swing
vs Frequency
LT1881 THD + Noise vs Frequency
120
100
80
60
40
20
0
35
30
25
20
15
10
5
10
1
V
V
=
IN
15V
P-P
A
T
= 1
S
V
A
V
V
=
=
2.5V
15V
S
S
= 2V
= 25°C
A
= –1
V
A
S
T
= 25°C
V
= 15V
0.1
0.01
0.001
0.0001
A
A
= –1
= 1
V
V
A
= –1
V
A
S
T
= 25°C
V
= 2.5V
0
0
2000
4000
6000
8000
10000
1
10
FREQUENCY (kHz)
100
10
100
1k
FREQUENCY (Hz)
10k
100k
CAPACITIVE LOAD (pF)
1881/2 G42
1881/2 G43
1881/2 G44
18812fa
11
LT1881/LT1882
U W
TYPICAL PERFOR A CE CHARACTERISTICS
LT1881 Total Harmonic Distortion
+ Noise vs Output Voltage
Amplitude
LT1881 Open-Loop Gain
10
f = 1kHz
RF = RG = 10k
A
V
V
S
= –1
R
L = 10k
R
L = 2k
=
2.5V
1
0.1
A
V
V
S
= –1
=
15V
RL = 50k
A
V
V
S
= 2
=
2.5V
0.01
0.001
OUTPUT VOLTAGE (5V/DIV)
1881 G46.tif
A
V
V
S
= 2
=
VS
= 15V
15V
10m
0.1
1
10
100
OUTPUT VOLTAGE AMPLITUDE (V
)
P-P
1881/2 G45
LT1881 Settling Time/
Output Step 0.01%
LT1881 Settling Time/
Output Step 0.01%
0.5mV/DIV
GND
10V
10V
GND
0.5mV/DIV
A
V = 1
20μs/DIV
1881 G47.tif
A
V = 1
50μs/DIV
1881 G48.tif
VS
=
15V
VS
=
15V
LT1881 Gain vs Temperature
LT1881 Gain vs Load Resistance
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
10.0
+A
(0V TO 10V)
V
=
5V
VOL
S
–A
(0V TO –10V)
VOL
R
= 10k
L
1.0
0V TO 10V
0V TO –10V
R
= 2k
L
V
=
15V
S
0.1
–50 –25
0
25
50
75 100 125
0
5
10
15
20
25
30
TEMPERATURE (°C)
LOAD RESISTANCE (kΩ)
1881/2 G49
1881/2 G50
18812fa
12
LT1881/LT1882
U
W
U U
APPLICATIO S I FOR ATIO
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. TheLT1881andLT1882offersuperiorcapacitive
load driving capabilities over the LT1884 and LT1885 in
lowvoltagegainconfigurations.Offsetvoltagesaretrimmed
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 de-
pends upon proper applications circuit design and board
layout.
PC board layout is important to insure that leakage cur-
rents 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.
Preserving Input Precision
Preserving the input voltage accuracy of the LT1881/
LT1882requiresthattheapplicationscircuitandPCboard
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 connec-
tions to the amplifier’s input pins close together and away
fromheatdissipatingcomponents.Aircurrentsacrossthe
board can also generate temperature differentials.
Input Protection
The inverting and noninverting input pins of the LT1881
and LT1882 have limited on-chip protection. ESD protec-
tion is provided to prevent damage during handling. The
inputtransistorshavevoltageclampingandlimitingresis-
tors to protect against input differentials up to 10V. Short
transientsabovethislevelwillalsobetolerated.Iftheinput
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.
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 mini-
mize total circuit error.
Capacitive Loads
The LT1881 and LT1882 can drive capacitive loads up to
1000pF in unity-gain. The capacitive load driving in-
creases as the amplifier is used in higher gain configura-
tions. Capacitive load driving may be increased by
decoupling the capacitance from the output with a small
resistance.
18812fa
13
LT1881/LT1882
U
PACKAGE DESCRIPTIO
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
7
6
5
.255 .015*
(6.477 0.381)
1
2
4
3
.130 .005
.300 – .325
.045 – .065
(3.302 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
.120
.020
(0.508)
MIN
(3.048)
MIN
+.035
.325
–.015
.018 .003
(0.457 0.076)
.100
(2.54)
BSC
+0.889
8.255
(
)
N8 1002
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
18812fa
14
LT1881/LT1882
U
PACKAGE DESCRIPTIO
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
.045 .005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 .005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 .005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(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)
SO8 0303
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
13
12
11
10
9
8
14
N
N
1
.245
MIN
.160 .005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
2
3
N/2
N/2
7
.030 .005
TYP
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
1
2
3
4
5
6
×
45°
.053 – .069
(1.346 – 1.752)
(0.254 – 0.508)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0° – 8° TYP
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
.016 – .050
(0.406 – 1.270)
S14 0502
NOTE:
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
1. DIMENSIONS IN
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
18812fa
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
15
LT1881/LT1882
U
TYPICAL APPLICATIO
–50°C to 600°C Digital Thermometer Operates on 3.3V
V
CC
= 3.3V
R
F
1k
R1
4k
R2
4k
V
CC
–
V
V
REF
CC
CLK
A2
1μF
+IN
–IN
GND
1/2 LT1881
R
T
R3
1k
LTC1287
D
OUT
CS/SHDN
V
CC
+
–
A1
10k
0.1%
1/2 LT1881
V
CC
V =
+ 1.588mV/°C
+
2
10k
0.1%
RT: OMEGA F4132 1000Ω RTD
R1, R2, R3, RF: USE BI 698-3 2k × 8 RESISTOR NETWORK
1881/2 TA02
RELATED PARTS
PART NUMBER
LT1112/LT1114
LT1167
DESCRIPTION
COMMENTS
= 60μV Max
Dual/Quad Picoamp Input Op Amp
V
OS
Gain Programmable Instrumentation Amp
Low Noise, Rail-to-Rail Precision Op Amp
Low Noise JFET Op Amp
Gain Error = 0.08% Max
LT1677
e = 3.2nV/√Hz
n
LT1793
I = 10pA Max
B
LT1880
SOT-23 Picoamp Input Precision Op Amp
Dual/Quad Picoamp Input Op Amp
Zero Drift Op Amp in SOT-23
150μV Max V , –40°C to 85°C Operation Guaranteed, SOT-23 Package
OS
LT1884/LT1885
LTC2050
3 Times Faster than LT1881/LT1882
V
= 3μV Max, Rail-to-Rail Output
OS
18812fa
LT 0407 REV A • PRINTED IN USA
16 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
© LINEAR TECHNOLOGY CORPORATION 2000
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