LT1881AIN8 [Linear]
Dual and Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps; 双路和四路，轨到轨输出，皮安输入精密运算放大器
| 型号： | LT1881AIN8 |
| 厂家： | 
Linear |
| 描述： | Dual and Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps |
| 文件： | 总12页 (文件大小：187K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Final Electrical Specifications
LT1881/LT1882
Dual and Quad
Rail-to-Rail Output,
Picoamp Input Precision Op Amps
U
April 2000
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
Capacitive loads up to 1000pF can be driven directly in
unity-gain follower applications.
■
Battery-Powered Systems
■
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.
, LTC and LT 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
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.
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
D
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
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Single supply operation VEE = 0, VCC = 5V; VCM = VCC/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
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
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
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 VEE = 0, VCC = 5V; VCM = VCC/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
Input Noise Voltage Density
Input Noise Current Density
Input Voltage Range
nV/√Hz
pA/√Hz
n
i
f = 1kHz
0.03
n
V
V
V
+ 1.0
+ 1.2
V
V
– 1.0
– 1.2
V
V
CM
EE
EE
CC
CC
●
CMRR
PSRR
Common Mode Rejection Ratio
1V < V < 4V
106
104
128
dB
dB
CM
1.2V < V < 3.8V
●
●
●
CM
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Large-Signal Voltage Gain
V
= 0, V = 1.5V; 2.7V < V < 32V
106
132
2.4
dB
V
EE
CM
CC
2.7
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
600
mV
mV
mV
mV
OL
OH
I
I
I
= 100µA
= 1mA
= 5mA
SINK
SINK
SINK
270
No Load
●
●
●
●
120
130
180
360
220
230
300
600
mV
mV
mV
mV
(Referred to V
)
I
I
I
= 100µA
= 1mA
= 5mA
CC
SOURCE
SOURCE
SOURCE
I
Supply Current Per Amplifier
V
V
V
= 3V
0.45
0.5
0.65
0.65
0.70
0.85
1.2
mA
mA
S
CC
CC
CC
●
●
●
= 5V
0.9
1.4
mA
mA
= 12V
0.5
1.0
1.5
mA
mA
I
Short-Circuit Current
V
V
Short to GND
●
●
15
15
30
30
mA
mA
SC
OUT
OUT
Short to V
CC
GBW
Gain-Bandwidth Product
Settling Time
f = 20kHz
0.01%, V
0.5
1.0
30
MHz
t
= 1.5V to 3.5V,
OUT
µs
S
A = –1, R = 2k
V
L
+
–
SR
SR
Slew Rate Positive
Slew Rate Negative
A = –1
0.15
0.12
0.35
0.18
V/µs
V/µs
V
●
●
A = –1
V
0.11
0.08
V/µs
V/µs
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 VEE = 0, VCC = 5V; VCM = VCC/2 unless otherwise noted. (Note 5)
SYMBOL
∆V
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Offset Voltage Match (LT1881A)
(Note 7)
30
70
125
160
µV
µV
µV
OS
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)
(Notes 7, 8)
●
0.4
1.2
µV/°C
∆I +
B
Noninverting Bias Current Match
(LT1881A)
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
700
900
1000
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
∆CMRR
∆PSRR
Common Mode Rejection Match
Power Supply Rejection Match
(Notes 7, 9)
●
●
102
104
125
126
dB
dB
V
= 0V, V = 1.5V, 2.7V < V < 32V,
CM CC
EE
(Notes 7, 9)
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
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
I
I
Input Offset Current (LT1881A)
Input Offset Current (LT1881/LT1882)
Input Bias Current (LT1881A)
150
150
150
150
200
250
300
pA
pA
pA
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
500
600
700
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
200
250
300
pA
pA
pA
B
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Bias Current (LT1881/LT1882)
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
Input Noise Voltage Density
Input Noise Current Density
Input Voltage Range
nV/√Hz
pA/√Hz
n
i
f = 1kHz
0.03
n
V
V
V
+ 1.0
+ 1.2
V
V
– 1.0
– 1.2
V
V
CM
EE
EE
CC
CC
●
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
CMRR
PARAMETER
CONDITIONS
–13.5V < V < 13.5V
MIN
114
110
106
TYP
130
MAX
UNITS
dB
Common Mode Rejection Ratio
Positive Power Supply Rejection Ratio
Negative Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Large-Signal Voltage Gain
●
●
●
●
CM
+PSRR
–PSRR
V
V
= –15, V = 0; 1.5V < V < 18V
132
dB
EE
CM
CC
= 15, V = 0; –1.5V < V < –18V
132
dB
CC
CM
EE
±1.2
1600
±1.35
V
A
R = 10k; –13.5V < V < 13.5V
L OUT
1000
700
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
< 12V
90
65
V/mV
V/mV
L
OUT
V
V
Output Voltage Swing Low
No Load
●
●
●
●
20
25
70
40
50
150
600
mV
mV
mV
mV
OL
OH
(Referred to V
)
I
I
I
= 100µA
= 1mA
= 5mA
EE
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
)
I
I
I
= 100µA
= 1mA
= 5mA
CC
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
EE
20
15
30
30
mA
mA
CC
GBW
Gain-Bandwidth Product
Settling Time
f = 20kHz
0.01%, V
0.6
1.1
35
MHz
t
= –5V to 5V,
OUT
µs
S
A = –1, R = 2k
V
L
+
–
SR
SR
∆V
Slew Rate Positive
A = –1
0.21
0.18
0.4
0.20
42
V/µs
V/µs
V
●
●
Slew Rate Negative
A = –1
V
0.13
0.1
V/µs
V/µs
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)
Offset Voltage Match Drift
35
70
125
160
µV
µV
µV
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
(Notes 6, 7)
(Notes 7, 8)
●
0.4
1.1
µV/°C
∆I +
B
Noninverting Bias Current Match
(LT1881/LT1882)
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
125
300
400
500
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
∆CMRR
Common Mode Rejection Match
(Notes 7, 9)
●
110
dB
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
= –15V, V = 0V,
MIN
TYP
MAX
UNITS
∆+PSRR
Positive Power Supply Rejection Match
V
●
●
108
130
dB
EE
CM
1.5V < V < 18V, (Notes 7, 9)
CC
∆–PSRR
Negative Power Supply Rejection Match
V
= 15V, V = 0V,
104
130
dB
CC
CM
–1.5V < V < –18V, (Notes 7, 9)
EE
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 6: This parameter is not 100% tested.
Note 7: Matching parameters are the difference between amplifiers
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.
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
Note 3: A heat sink may be required to keep the junction temperature
input bias currents.
below absolute maximum.
Note 4: The LT1881C, LT1882C, LT1881I and LT1882I are guaranteed
functional over the operating temperature range of –40°C to 85°C.
Note 9: ∆CMRR and ∆PSRR 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 5: The LT1881C and 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 and LT1882I are
guaranteed to meet specified performance from –40°C to 85°C.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current per Amplifier vs
Supply Voltage
Slew Rate vs Supply Voltage
Slew Rate vs Temperature
1200
1000
800
600
400
200
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
V
V
= ±15V
= ±5V
S
S
RISING
RISING
125°C
25°C
V
V
= ±15V
= ±5V
S
S
FALLING
FALLING
–55°C
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 G01
1881/2 G02
6
LT1881/LT1882
U W
TYPICAL PERFOR A CE CHARACTERISTICS
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%
0.1%
0.01%
2
2
25°C
0
0
–55°C
–2
–4
–6
–8
–10
–2
–4
–6
–8
–10
0.01%
0.1%
0.01%
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
= ±15V
S
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
Gain vs Frequency with CLOAD
,
Gain vs Frequency with CLOAD
,
AV = 1
AV = –1
10
0
10
0
V
= ±15V
V
= ±15V
S
S
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
7
LT1881/LT1882
U W
TYPICAL PERFOR A CE CHARACTERISTICS
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
8
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 VEE + 0.8V and VCC – 0.9V. Exceeding
this common mode range will cause the gain to drop to
zero; however, no gain 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.
9
LT1881/LT1882
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
8
7
6
5
4
0.255 ± 0.015*
(6.477 ± 0.381)
1
2
3
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
0.125
0.020
(0.508)
MIN
(3.175)
MIN
+0.035
0.325
–0.015
0.018 ± 0.003
(0.457 ± 0.076)
0.100
(2.54)
BSC
+0.889
8.255
(
)
N8 1098
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
10
LT1881/LT1882
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
7
5
8
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
3
4
2
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
TYP
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
SO8 1298
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
13
12
11 10
8
14
9
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
1
2
3
4
5
6
7
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0° – 8° TYP
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
TYP
0.016 – 0.050
(0.406 – 1.270)
S14 1298
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
11
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
CC
CLK
REF
A2
1µF
+IN
–IN
GND
1/2 LT1881
R
T
R3
1k
LTC1287
D
OUT
V
CC
+
CS/SHDN
–
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
LT1677
DESCRIPTION
COMMENTS
= 60µV Max
Dual/Quad Picoamp Input Op Amp
V
OS
Gain Programmable Instrumentation Amp
Low Noise JFET Op Amp
Gain Error = 0.08% Max
LT1793
I = 10pA Max
B
LT1884/LT1885
LTC2050
Dual/Quad Picoamp Input Op Amp
Zero Drift Op Amp in SOT-23
3 Times Faster than LT1881/LT1882
V
= 3µV Max, Rail-to-Rail Output
OS
18812i LT/TP 0400 4K • PRINTED IN USA
12 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 2000
相关型号：
LT1881AIN8#PBF
LT1881 - Dual Rail-to-Rail Output, Picoamp Input Precision Op Amps; Package: PDIP; Pins: 8; Temperature Range: -40°C to 85°C
Linear
LT1881AIN8#TRPBF
IC DUAL OP-AMP, 110 uV OFFSET-MAX, 0.85 MHz BAND WIDTH, PDIP8, 0.300 INCH, PLASTIC, DIP-8, Operational Amplifier
Linear
LT1881AIS8#PBF
LT1881 - Dual Rail-to-Rail Output, Picoamp Input Precision Op Amps; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C
Linear
LT1881AIS8#TRPBF
LT1881 - Dual Rail-to-Rail Output, Picoamp Input Precision Op Amps; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C
Linear
LT1881CN8#PBF
LT1881 - Dual Rail-to-Rail Output, Picoamp Input Precision Op Amps; Package: PDIP; Pins: 8; Temperature Range: 0°C to 70°C
Linear
LT1881CN8#TR
IC DUAL OP-AMP, 125 uV OFFSET-MAX, 0.85 MHz BAND WIDTH, PDIP8, 0.300 INCH, PLASTIC, DIP-8, Operational Amplifier
Linear
LT1881CN8#TRPBF
IC DUAL OP-AMP, 125 uV OFFSET-MAX, 0.85 MHz BAND WIDTH, PDIP8, 0.300 INCH, PLASTIC, DIP-8, Operational Amplifier
Linear
LT1881CS8#TR
LT1881 - Dual Rail-to-Rail Output, Picoamp Input Precision Op Amps; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C
Linear
©2020 ICPDF网 联系我们和版权申明