LINER LT1881CN8

Final Electrical Specifications
LT1881/LT1882
Dual and Quad
Rail-to-Rail Output,
Picoamp Input Precision Op Amps
April 2000
DESCRIPTIO
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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
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APPLICATIO S
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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.
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.
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TYPICAL APPLICATIO
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
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)
VOUT
– 4.096V
TO 4.096V
1881/2 TA01a
–5V
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1
LT1881/LT1882
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ABSOLUTE
AXI U RATI GS
(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) .. – 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
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PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
A
B
V– 4
N8 PACKAGE
8-LEAD PDIP
8
V+
7
OUT B
6
–IN B
5
+IN B
LT1881CN8
LT1881IN8
LT1881CS8
LT1881IS8
LT1881ACN8
LT1881AIN8
LT1881ACS8
LT1881AIS8
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 130°C/W (N8)
TJMAX = 150°C, θJA = 190°C/W (S8)
ORDER PART NUMBER
TOP VIEW
14 OUT D
OUT A 1
–IN A 2
A
D
12 +IN D
+IN A 3
V+ 4
+IN B 5
13 –IN D
LT1882CS
LT1882IS
11 V –
B
D
10 +IN C
–IN B 6
9
–IN C
OUT B 7
8
OUT C
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
VOS
Input Offset Voltage (LT1881A)
CONDITIONS
MIN
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
Input Offset Voltage (LT1881/LT1882)
Input Offset Voltage Drift
(Note 6)
IOS
Input Offset Current (LT1881A)
Input Offset Current (LT1881/LT1882)
2
TYP
MAX
UNITS
25
50
85
110
µV
µV
µV
30
80
125
150
µV
µV
µV
0.3
0.3
0.8
0.8
µV/°C
µV/°C
100
200
250
300
pA
pA
pA
150
500
600
700
pA
pA
pA
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
IB
Input Bias Current (LT1881A)
CONDITIONS
MIN
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
Input Bias Current (LT1881/LT1882)
TYP
MAX
UNITS
100
200
250
300
pA
pA
pA
150
500
600
700
pA
pA
pA
Input Noise Voltage
0.1Hz to 10Hz
0.5
µVP-P
en
Input Noise Voltage Density
f = 1kHz
14
nV/√Hz
in
Input Noise Current Density
f = 1kHz
0.03
pA/√Hz
VCM
Input Voltage Range
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
●
VEE + 1.0
VEE + 1.2
1V < VCM < 4V
1.2V < VCM < 3.8V
106
104
128
●
VEE = 0, VCM = 1.5V; 2.7V < VCC < 32V
●
106
132
Minimum Operating Supply Voltage
AVOL
Large-Signal Voltage Gain
2.4
●
RL = 10k; 1V < VOUT < 4V
VCC – 1.0
VCC – 1.2
V
V
dB
dB
dB
2.7
V
500
350
1600
●
V/mV
V/mV
300
250
800
●
V/mV
V/mV
250
200
400
●
V/mV
V/mV
RL = 2k; 1V < VOUT < 4V
RL = 1k; 1V < VOUT < 4V
VOL
Output Voltage Swing Low
No Load
ISINK = 100µA
ISINK = 1mA
ISINK = 5mA
●
●
●
●
20
25
70
270
40
50
150
600
mV
mV
mV
mV
VOH
Output Voltage Swing High
(Referred to VCC)
No Load
ISOURCE = 100µA
ISOURCE = 1mA
ISOURCE = 5mA
●
●
●
●
120
130
180
360
220
230
300
600
mV
mV
mV
mV
IS
Supply Current Per Amplifier
VCC = 3V
0.45
0.65
0.85
1.2
mA
mA
0.5
0.65
0.9
1.4
mA
mA
0.5
0.70
1.0
1.5
mA
mA
15
15
30
30
mA
mA
0.5
1.0
MHz
30
µs
●
VCC = 5V
●
VCC = 12V
●
ISC
Short-Circuit Current
GBW
Gain-Bandwidth Product
f = 20kHz
tS
Settling Time
0.01%, VOUT = 1.5V to 3.5V,
AV = –1, RL = 2k
SR +
Slew Rate Positive
AV = – 1
SR –
Slew Rate Negative
VOUT Short to GND
VOUT Short to VCC
●
●
0.15
0.12
0.35
●
V/µs
V/µs
0.11
0.08
0.18
●
V/µs
V/µs
AV = – 1
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
PARAMETER
CONDITIONS
∆VOS
Offset Voltage Match (LT1881A)
(Note 7)
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
(Note 7)
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
●
Offset Voltage Match (LT1881/LT1882)
MIN
TYP
MAX
UNITS
30
70
125
160
µV
µV
µV
35
125
175
235
µV
µV
µV
0.4
1.2
µV/°C
200
300
400
500
pA
pA
pA
250
700
900
1000
pA
pA
pA
Offset Voltage Match Drift
(Notes 6, 7)
Noninverting Bias Current Match
(LT1881A)
(Notes 7, 8)
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
Noninverting Bias Current Match
(LT1881/LT1882)
(Notes 7, 8)
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
∆CMRR
Common Mode Rejection Match
(Notes 7, 9)
●
102
125
dB
∆PSRR
Power Supply Rejection Match
VEE = 0V, VCM = 1.5V, 2.7V < VCC < 32V,
(Notes 7, 9)
●
104
126
dB
∆IB+
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
VOS
Input Offset Voltage (LT1881A)
CONDITIONS
MIN
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
Input Offset Voltage (LT1881/LT1882)
Input Offset Voltage Drift
(Note 6)
IOS
Input Offset Current (LT1881A)
Input Offset Current (LT1881/LT1882)
IB
Input Bias Current (LT1881A)
Input Bias Current (LT1881/LT1882)
TYP
MAX
UNITS
25
50
85
110
µV
µV
µV
30
80
125
150
µV
µV
µV
0.3
0.3
0.8
0.8
µV/°C
µV/°C
150
200
250
300
pA
pA
pA
150
500
600
700
pA
pA
pA
150
200
250
300
pA
pA
pA
150
500
600
700
pA
pA
pA
Input Noise Voltage
0.1Hz to 10Hz
0.5
µVP-P
en
Input Noise Voltage Density
f = 1kHz
14
nV/√Hz
in
Input Noise Current Density
f = 1kHz
0.03
pA/√Hz
VCM
Input Voltage Range
●
4
VEE + 1.0
VEE + 1.2
VCC – 1.0
VCC – 1.2
V
V
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
CMRR
Common Mode Rejection Ratio
–13.5V < VCM < 13.5V
+PSRR
Positive Power Supply Rejection Ratio
VEE = –15, VCM = 0; 1.5V < VCC < 18V
–PSRR
Negative Power Supply Rejection Ratio
VCC = 15, VCM = 0; –1.5V < VEE < –18V
Minimum Operating Supply Voltage
AVOL
Large-Signal Voltage Gain
MIN
TYP
●
114
130
dB
●
110
132
dB
●
106
132
dB
1600
●
1000
700
V/mV
V/mV
175
125
420
●
V/mV
V/mV
90
65
230
●
V/mV
V/mV
±1.2
●
RL = 10k; –13.5V < VOUT < 13.5V
RL = 2k; –13.5V < VOUT < 13.5V
RL = 1k; –12V < VOUT < 12V
MAX
±1.35
UNITS
V
VOL
Output Voltage Swing Low
(Referred to VEE)
No Load
ISINK = 100µA
ISINK = 1mA
ISINK = 5mA
●
●
●
●
20
25
70
270
40
50
150
600
mV
mV
mV
mV
VOH
Output Voltage Swing High
(Referred to VCC)
No Load
ISOURCE = 100µA
ISOURCE = 1mA
ISOURCE = 5mA
●
●
●
●
160
160
180
360
220
230
300
600
mV
mV
mV
mV
IS
Supply Current Per Amplifier
VS = ±15V
0.5
0.85
1.1
1.6
mA
mA
●
20
15
40
40
mA
mA
●
20
15
30
30
mA
mA
0.6
1.1
MHz
35
µs
●
ISC
Short-Circuit Current
VOUT Short to VEE
VOUT Short to VCC
GBW
Gain-Bandwidth Product
f = 20kHz
tS
Settling Time
0.01%, VOUT = – 5V to 5V,
AV = –1, RL = 2k
SR +
Slew Rate Positive
AV = – 1
SR –
∆VOS
Slew Rate Negative
Offset Voltage Match (LT1881/LT1882)
0.21
0.18
0.4
●
V/µs
V/µs
0.13
0.1
0.20
●
V/µs
V/µs
AV = – 1
(Note 5)
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
Offset Voltage Match Drift
(Notes 6, 7)
●
Noninverting Bias Current Match
(LT1881/LT1882)
(Notes 7, 8)
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
0°C < TA < 70°C
– 40°C < TA < 85°C
●
●
(Notes 7, 9)
●
Offset Voltage Match (LT1881A)
∆IB+
Noninverting Bias Current Match
(LT1881A)
∆CMRR
Common Mode Rejection Match
110
42
125
175
235
µV
µV
µV
35
70
125
160
µV
µV
µV
µV/°C
0.4
1.1
240
700
900
1000
pA
pA
pA
200
300
400
500
pA
pA
pA
125
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
∆+PSRR
Positive Power Supply Rejection Match
VEE = – 15V, VCM = 0V,
1.5V < VCC < 18V, (Notes 7, 9)
∆ –PSRR
Negative Power Supply Rejection Match
VCC = 15V, VCM = 0V,
– 1.5V < VEE < – 18V, (Notes 7, 9)
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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, 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
tested or QA sampled at these temperatures. The LT1881I and LT1882I are
guaranteed to meet specified performance from – 40°C to 85°C.
MIN
TYP
MAX
UNITS
●
108
130
dB
●
104
130
dB
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: ∆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.
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TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current per Amplifier vs
Supply Voltage
Slew Rate vs Supply Voltage
0.45
1200
0.5
AV = –1
0.40
125°C
1000
RISING
RISING
0.4
800
25°C
600
–55°C
400
SLEW RATE (V/µs)
0.35
SLEW RATE (V/µs)
SUPPLY CURRENT PER AMPLIFIER (µA)
Slew Rate vs Temperature
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 32
TOTAL SUPPLY VOLTAGE (V)
36
1881/2 G01
6
VS = ±15V
0
0
4
8 12 16 20 24 28 32
TOTAL SUPPLY VOLTAGE (V)
36
1881/2 G02
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
1881/2 G03
LT1881/LT1882
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TYPICAL PERFOR A CE CHARACTERISTICS
Settling Time vs Output Step
10
VS = ±15V
AV = –1
OUTPUT STEP (V)
6
4
6
0.1%
0.01%
2
0
–2
–4
900
VS = ±15V
AV = 1
8
0.1%
4
OUTPUT STEP (V)
8
0.01%
0.1%
GAIN BANDWIDTH PRODUCT (kHz)
10
0.01%
2
0
–2
0.1%
0.01%
–4
–6
–6
–8
–8
–10
Gain Bandwidth Product vs
Supply Voltage
Settling Time vs Output Step
–10
0 5 10 15 20 25 30 35 40 45 50 55 60 65
SETTLING TIME (µs)
850
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)
1881/2 G04
0
4
8 12 16 20 24 28 32
TOTAL SUPPLY VOLTAGE (V)
1881/2 G05
Phase Margin vs Supply Voltage
1881/2 G06
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)
GAIN (dB)
56
–20
VS = ±2.5V
50
VS = ±2.5V
VS = ±15V
–20
VS = ±15V
–30
–30
48
0
4
8 12 16 20 24 28 32
TOTAL SUPPLY VOLTAGE (V)
–40
36
1k
10k
100k
1M
FREQUENCY (Hz)
10M
1881/2 G07
100M
–40
1k
10k
100k
1M
FREQUENCY (Hz)
10M
1881/2 G08
Gain vs Frequency with CLOAD,
AV = 1
100M
1881/2 G09
Gain vs Frequency with CLOAD,
AV = –1
10
10
VS = ±15V
VS = ±15V
0
0
1500pF
1800pF
1000pF
–10
GAIN (dB)
46
GAIN (dB)
PHASE MARGIN (DEG)
58
500pF
–20
–10
1000pF
–20
500pF
0pF
–30
–40
–30
1k
10k
100k
1M
FREQUENCY (Hz)
10M
100M
1881/2 G10
–40
0pF
1k
10k
100k
1M
FREQUENCY (Hz)
10M
100M
1881/2 G11
7
LT1881/LT1882
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TYPICAL PERFOR A CE CHARACTERISTICS
VOUT (20mV/DIV)
TIME (50µs/DIV)
1881/2 G12
TIME (2µs/DIV)
8
Small Signal Response, AV = 1,
RL = 2k
VOUT (20mV/DIV)
VOUT (20mV/DIV)
Small Signal Response, AV = –1,
CL = 1000pF
1881/2 G15
TIME (2µs/DIV)
1881/2 G13
1881/2 G14
Small Signal Response, AV = 1,
CL = 500pF
VOUT (20mV/DIV)
VOUT (5V/DIV)
TIME (50µs/DIV)
Small Signal Response, AV = –1,
No Load
Large Signal Response, AV = 1
VOUT (5V/DIV)
Large Signal Response, AV = –1
TIME (2µs/DIV)
1881/2 G16
TIME (2µs/DIV)
1881/2 G17
LT1881/LT1882
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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. 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 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.
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.
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
1
2
3
4
0.255 ± 0.015*
(6.477 ± 0.381)
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
(
+0.035
0.325 –0.015
8.255
+0.889
–0.381
)
0.045 – 0.065
(1.143 – 1.651)
0.065
(1.651)
TYP
0.100
(2.54)
BSC
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
10
0.130 ± 0.005
(3.302 ± 0.127)
0.125
(3.175) 0.020
MIN
(0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
N8 1098
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
8
5
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
3
2
4
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 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)
14
13
12
11
10
9
8
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
1
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
2
3
4
5
0.053 – 0.069
(1.346 – 1.752)
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
7
0.004 – 0.010
(0.101 – 0.254)
0° – 8° TYP
0.016 – 0.050
(0.406 – 1.270)
6
0.050
(1.270)
BSC
S14 1298
11
LT1881/LT1882
U
TYPICAL APPLICATIO
–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
+
LTC1287
GND
–
10k
0.1%
VREF
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 × 8 RESISTOR NETWORK
1881/2 TA02
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1112/LT1114
Dual/Quad Picoamp Input Op Amp
VOS = 60µV Max
LT1677
Gain Programmable Instrumentation Amp
Gain Error = 0.08% Max
LT1793
Low Noise JFET Op Amp
IB = 10pA Max
LT1884/LT1885
Dual/Quad Picoamp Input Op Amp
3 Times Faster than LT1881/LT1882
LTC2050
Zero Drift Op Amp in SOT-23
VOS = 3µV Max, Rail-to-Rail Output
12
Linear Technology Corporation
18812i LT/TP 0400 4K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com
 LINEAR TECHNOLOGY CORPORATION 2000