LT1100 (Linear Technology)
Precision/ Chopper-Stabilized Instrumentation Amplifier

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LTC1100
Precision, Chopper-Stabilized
Instrumentation Amplifier
FEATURES
s Offset Voltage: 10µV Max
s Offset Voltage Drift: 50nV/°C Max
s Bias Current: 50pA Max
s Offset Current: 50pA Max
s Gain Nonlinearity: 8ppm Max
s Gain Error: ±0.05% Max
s CMRR: 104dB
s 0.1Hz to 10Hz Noise: 2µVP-P
s Single 5V Supply Operation
s 8-Pin MiniDIP
APPLICATI S
s Thermocouple Amplifiers
s Strain Gauge Amplifiers
s Differential to Single-Ended Converters
DESCRIPTIO
The LTC1100 is a high precision instrumentation ampli-
fier using chopper-stabilization techniques to achieve
outstanding DC performance. The input DC offset is
typically 1µV while the DC offset drift is typically 10nV/°C;
a very low bias current of 50pA is also achieved.
The LTC1100 is self-contained; that is, it achieves a differ-
ential gain of 100 without any external gain setting resistor
or trim pot. The gain linearity is 8ppm and the gain drift is
4ppm/°C. The LTC1100 operates from a single 5V supply
up to ±8V. The output typically swings 300mV from its
power supply rails with a 10k load.
An optional external capacitor can be added from pin 7 to
pin 8 to tailor the device’s 18kHz bandwidth and to
eliminate any unwanted noise pickup.
The LTC1100 is also offered in a 16-pin surface mount
package with selectable gains of 10 or 100.
The LTC1100 is manufactured using Linear Technology’s
enhanced LTCMOSTM silicon gate process.
LTCMOS is a trademark of Linear Technology Corporation
TYPICAL APPLICATI
Single 5V Supply, DC Instrumentation Amplifier
18
VOUT
2 7 0.01µF
3
–VIN
LTC1100
6
VIN
4 5 V+ = 5V
VOUT = 100 [VIN – (–VIN)]
0.1µF
LTC1100 • TA01
1


LT1100 (Linear Technology)
Precision/ Chopper-Stabilized Instrumentation Amplifier

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LTC1100
ABSOLUTE AXI U RATI GS
Operating Temperature Range
LTC1100M/AM ................................ 55°C to 125°C
LTC1100C/AC .................................... 40°C to 85°C
Output Short Circuit Duration ......................... Indefinite
Storage Temperature Range ................ 65°C to 150°C
Total Supply Voltage (V+ to V) ............................. 18V
Input Voltage ....................... (V+ + 0.3V) to (V0.3V)
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
GND REF 1
CMRR 2
–VIN 3
V4
8 VOUT
7 COMP
6 VIN
5 V+
J8 PACKAGE
N8 PACKAGE
8-LEAD CERAMIC DIP 8-LEAD PLASTIC DIP
TJMAX = 150°C, θJA = 100°C/W (J)
TJMAX = 110°C, θJA = 130°C/W (N)
ORDER PART
NUMBER
LTC1100ACN8
LTC1100CJ8
LTC1100CN8
LTC1100AMJ8
LTC1100MJ8
Contact factory for Industrial grade parts
NC 1
GND REF 2
G = 10 3
CMRR 4
NC 5
–VIN 6
V7
NC 8
TOP VIEW
16 NC
15 VOUT
14 G = 10
13 COMP
12 NC
11 VIN
10 V+
9 NC
S PACKAGE
16-LEAD PLASTIC SOL
TJMAX = 110°C, θJA = 100°C/W
ORDER PART
NUMBER
LTC1100ACS
LTC1100CS
ELECTRICAL CHARACTERISTICS VS = ±5V, RL = 10k, CC = 1000pF, unless otherwise specified.
PARAMETER
Gain Error
CONDITIONS
TA = 25°C
Gain Nonlinearity
TA = 25°C
Input Offset Voltage
Input Offset Voltage Drift
Input Noise Voltage
Input Bias Current
(Note 1)
(Note 1)
DC to 10Hz, TA = 25°C
TA = 25°C
Input Offset Current
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
Supply Current
VCM = 2.3V to 4.7V (Note 2)
VS = ±2.375V to ±8V
RL = 2k, VS = ±8V
RL =10k, VS = ±8V
TA = 25°C
Internal Sampling Frequency
Bandwidth
TA = 25°C
TA = 25°C
q
q
q
q
q
q
q
q
q
q
LTC1100ACN (Note 3)
MIN TYP MAX
0.01 0.05
0.10
38
12 30
±1 ±10
±5 ±100
1.9
2.5 50
120
10 50
104 115
120
– 7.2 6.2
– 7.7 7.5
2.4 2.8
3.4 4.0
2.8
18
LTC1100CN/CJ
MIN TYP MAX
0.01 0.075
0.150
3 20
12 60
±1 ±10
±5 ±100
1.9
2.5 65
135
10 65
90 110
105
– 7.2 6.2
– 7.7 7.5
2.4 3.3
3.4 4.5
2.8
18
UNITS
±%
±%
ppm
ppm
µV
nV/°C
µVP-P
pA
pA
pA
dB
dB
V
V
mA
mA
kHz
kHz
2


LT1100 (Linear Technology)
Precision/ Chopper-Stabilized Instrumentation Amplifier

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LTC1100
ELECTRICAL CHARACTERISTICS VS = ±5V, RL = 10k, CC = 1000pF, unless otherwise specified.
PARAMETER
Gain Error
Gain Nonlinearity
Input Offset Voltage
Input Offset Voltage Drift
Input Noise Voltage
Input Bias Current
Input Offset Current
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
Supply Current
Internal Sampling Frequency
Bandwidth
CONDITIONS
TA = 25°C
TA = 25°C
(Note 1)
(Note 1)
DC to 10Hz, TA = 25°C
TA = 25°C
VCM = 4.7V to 2.3V
VS = ±2.375V to ±8V
RL = 10k, VS = ±8V
RL = 2k, VS = ±8V
TA = 25°C
TA = 25°C
TA = 25°C
LTC1100AMJ (Note 3)
MIN TYP MAX
0.01 0.05
q 0.11
38
q 40
±1 ±10
q ±5 ±100
1.9
5 50
q 300
q 80
q 100
q 115
q – 7.4
q – 7.0
7.4
6.0
2.4
q 4.2
2.8
18
LTC1100MJ
MIN TYP MAX
0.01 0.075
0.150
3 20
65
±1 ±10
±5 ±100
1.9
5 65
450
120
90
95
– 7.4 7.4
– 7.0 6.0
2.4 3.3
4.6
2.8
18
UNITS
±%
±%
ppm
ppm
µV
nV/°C
µVP-P
pA
pA
pA
dB
dB
V
V
mA
mA
kHz
kHz
ELECTRICAL CHARACTERISTICS VS = ±5V, RL = 10k, CC = 1000pF, unless otherwise specified.
PARAMETER
Gain Error
Gain Nonlinearity
Input Offset Voltage
Input Offset Voltage Drift
Input Noise Voltage
Input Bias Current
Input Offset Current
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
CONDITIONS
TA = 25°C, A V =100
A V =100
A V =10
A V =10
TA = 25°C, A V =100
A V =100
A V =10
A V =10
(Note 1)
(Note 1)
DC to 10Hz, TA = 25°C
TA = 25°C
VCM = 4.7V to 2.3V,
A V =100
A V =10
VS = ±2.375V to ±8V
LTC1100ACS (Note 3)
MIN TYP MAX
0.01 0.05
q 0.10
0.01 0.04
q 0.10
38
q 12 30
18
q 25
±1 ±10
q ±5 ±100
1.9
2.5 50
q 120
q 10 50
q 104 115
q 95
q 120
LTC1100CS
MIN TYP MAX
0.01 0.075
0.150
0.01 0.060
0.150
3 20
12 60
1 10
40
±1 ±10
±5 ±100
1.9
2.5 65
135
10 65
90 110
85
105
UNITS
±%
±%
±%
±%
ppm
ppm
ppm
ppm
µV
nV/°C
µVP-P
pA
pA
pA
dB
dB
dB
3


LT1100 (Linear Technology)
Precision/ Chopper-Stabilized Instrumentation Amplifier

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LTC1100
ELECTRICAL CHARACTERISTICS VS = ±5V, RL = 10k, CC = 1000pF, unless otherwise specified.
PARAMETER
Output Voltage Swing
Supply Current
Internal Sampling Frequency
Bandwidth
G = 100
G = 10
CONDITIONS
RL=10k, VS = ±8V
RL= 2k, VS = ±8V
TA = 25°C
TA = 25°C
TA = 25°C
LTC1100ACS (Note 3)
MIN TYP MAX
q – 7.2
q – 7.7
6.2
7.5
2.4 2.8
q 3.4 4.0
2.8
18
180
LTC1100CS
MIN TYP MAX
– 7.2 6.2
– 7.7 7.5
2.4 3.3
3.4 4.5
2.8
18
180
UNITS
V
V
mA
mA
kHz
kHz
kHz
The q denotes the specifications which apply over the full operating
temperature range.
Note 1: These parameters are guaranteed by design. Thermocouple effects
preclude measurement of these voltage levels in high speed automatic test
W
BLOCK DIAGRA S
systems. VOS is measured to a limit determined by test equipment
capability.
Note 2: See Applications Information, Single Supply Operation.
Note 3: Please consult Linear Technology Marketing.
2
R
99R
1
5 (V+)
3+
7
99R
R
6
+
4 (V)
8
R = 2.5k
LTC1100 • BD01
R
90R
2
10 (V+)
9R 4
3
6+
14
9R 90R
R 13
11 +
15
R = 2.5k
7 (V )
LTC1100 • BD02
NOTE: FOR A VOLTAGE GAIN OF 10V/V SHORT PIN 2 TO 3, AND PIN 14 TO 15.
TYPICAL PERFOR A CE CHARACTERISTICS
Gain Error vs Temperature
0.05
VS = ±8V
RL = 50k
0.04
0.03
0.02
0.01
0
–0.01
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1100 • TPC01
Gain, Phase vs Frequency
45
210
40 180
35
GAIN
150
PHASE
(G = 100)
30 120
25 90
20 60
GAIN
15
(G = 10)
30
10 0
5
100
–30
1k 10k 100k 1M
FREQUENCY (Hz)
LTC1100 • TPC02
4
Gain Nonlinearity
vs Temperature
25
VS = ±8V
RL = 50k
20
15
10
5
0
–5
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1100 • TPC03


LT1100 (Linear Technology)
Precision/ Chopper-Stabilized Instrumentation Amplifier

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TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
4
TA = –55°C
3
TA = 25°C
2 TA = 125°C
1
0
2 4 6 8 10 12 14 16 18
TOTAL SUPPLY VOLTAGE V+ TO V(V)
LTC1100 • TPC04
Power Supply Rejection Ratio
vs Frequency
150
125
100
75
50
25
0
0.1 1
10 100 1k
FREQUENCY (Hz)
10k 100k
LTC1100 • TPC05
CMRR vs Frequency
120
100
G = 100, RC =
CC = 0pF
80
G = 100, RC = 100k
CC = 10pF
60 RC C C
G = 10, RC =
40 1
3
2
CC = 0pF
20
LTC1100
6+
0
0.1 1 10 100 1k 10k 100k
FREQUENCY (Hz)
LTC1100 • TPC07
Bias Current vs
Common-Mode Voltage
360
VS = ±5V
300
240
TA = 125°C
180
120
60
0 TA = 25°C
– 60
–120
TA = –55°C
–180
–200
–6 –5 –4 –3 –2 –1 0 1 2 3
COMMON-MODE VOLTAGE (V)
4
LTC1100 • TPC10
Output Voltage Swing vs Load
±10
±9
±8 NEGATIVE
VS = ±8V, TA 85°C
±7 POSITIVE
±6
±5 NEGATIVE
VS = ±5V, TA 85°C
±4 POSITIVE
±3 NEGATIVE
VS = ±2.5V, TA 85°C
±2
POSITIVE
±1
0
0 1 2 3 4 5 6 7 8 9 10
LOAD RESISTANCE (k)
LTC1100 • TPC08
Voltage Noise vs Frequency
105
90
75
60
45
30
15
0
10 100 1k 10k 100k
FREQUENCY (Hz)
LTC1100 • TPC11
LTC1100
Common-Mode Range
vs Supply Voltage
8
TA = 25°C
6
4
2
POSITIVE COMMON-MODE RANGE
0
–2
–4
–6
NEGATIVE COMMON-MODE RANGE
–8
±2 ±3 ±4 ±5 ±6
SUPPLY VOLTAGE (V)
±7
±8
LTC1100 • TPC06
Undistorted Output Swing
vs Frequency
10
VS = ±5V
9
8
RL = 100k
7
RL = 2k
6
5
4
3
2
1
0
100
1k 10k
FREQUENCY (Hz)
100k
LTC1100 • TPC09
Internal Sampling Frequency
vs Supply Voltage
4
TA = –55°C
3
TA = 25°C
2
TA = 125°C
1
0
2 4 6 8 10 12 14 16
TOTAL SUPPLY VOLTAGE V+ TO V(V)
18
LTC1100 • TPC12
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LTC1100
TYPICAL PERFOR A CE CHARACTERISTICS
Large-Signal Transient Response
G = 100, VS = ±5V
Small-Signal Transient Response
G = 100, VS = ±5V
Overload Recovery
G = 100, VS = ±5V
2V/DIV
50mV/DIV
1V/DIV
2V/DIV
10µs/DIV
LTC1100 • TPC13
Large-Signal Transient Response
G = 10 (LTC1100CS Only), VS = ±5V
10µs/DIV
LTC1100 • TPC14
Small-Signal Transient Response
G = 10 (LTC1100CS Only), VS = ±5V
5µs/DIV
LTC1100 • TPC15
Overload Recovery
G = 10 (LTC1100CS Only), VS = ±5V
2V/DIV
50ms/DIV
1V/DIV
2V/DIV
10µs/DIV
LTC1100 • TPC16
10µs/DIV
LTC1100 • TPC17
1µs/DIV
LTC1100 • TPC18
PIN FUNCTIONS
8-Pin DIP (16-Pin SO)
Pin 1 (2) GND REF: Connect to system ground. This sets
the zero reference for the internal op amps.
Pin 2 (4) CMRR: This pin tailors the gain of the internal
amplifiers to maximize AC CMRR. For applications which
emphasize CMRR requirements, connect a 100k resistor
and a 10pF capacitor in series from CMRR to ground. See
the Applications section.
Pin 3 (6) –VIN: Inverting Input.
Pin 4 (7) V: Negative Supply.
Pin 5 (10) V+: Positive Supply.
Pin 6 (11) VIN: Noninverting Input.
Pin 7 (13) COMP: This pin reduces the bandwidth of the
internal amplifiers for applications at or near DC. Clock
feedthrough from the internal sampling clock can also be
suppressed by using the COMP pin. The standard com-
pensation circuit is a capacitor from COMP to VOUT, sized
to provide an RC pole with the internal 247k resistor
(22.5k for LTC1100CS in gain-of-10 mode). See the
Applications section.
Pin 8 (15) VOUT: Signal Output.
16-Pin SO Package Only
(3) G = 10: Short to pin (2) for gain of 10. Leave
disconnected for gain of 100.
(14) G = 10: Short to pin (15) for gain of 10. Leave
disconnected for gain of 100.
NOTE: Both pins must be shorted or open to provide
correct gain.
(1),(5),(8),(9),(12),(16) NC: No Internal Connection.
6


LT1100 (Linear Technology)
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LTC1100
APPLICATI S I FOR ATIO
Common-Mode Rejection
Due to very precise matching of the internal resistors, no
trims are required to obtain a DC CMRR of better than
100dB. However, things change as frequency rises. The
inverting amplifier is in a gain of 1.01 (1.1 for gain of 10),
while the noninverting amplifier is in a gain of 99 (9 for gain
of 10). As frequency rises, the higher gain amplifier hits its
gain-bandwidth limit long before the low gain amplifier,
degrading CMRR. The solution is straightforward— slow
down the inverting amplifier to match the noninverting
amp. Figure 1 shows the recommended circuit. The prob-
lem is less pronounced in the LTC1100CS in gain-of-10
mode; no CMRR trims are necessary.
3
LTC1100
+ 6+
2
8
100k
10pF
LTC1100 • TA02
Figure 1. Improving AC CMRR
Overcompensation
Many instrumentation amplifier applications process DC
or low frequency signals only; consequently the 18kHz
(180kHz for G = 10) bandwidth of the LTC1100 can be
reduced to minimize system errors or reduce transmitted
clock noise by using the COMP pin. A feedback cap from
COMP to VOUT will react with the 247k internal resistor
(22.5k for G = 10) to limit the bandwidth, as in Figure 2.
CB
37
LTC1100
6+
8
f 3dB
=
2π
1
RINT
× CB
RINT = 247k FOR G = 100
22.5k FOR G = 10
LTC1100 • TA03
Figure 2. Overcompensation to Reduce System Bandwidth
Aliasing
The LTC1100 is a chopper-stabilized instrumentation
amplifier; like all sampled systems it exhibits aliasing
behavior for input frequencies at or near the internal
sampling frequency. The LTC1100 incorporates special-
ized anti-aliasing circuitry which typically attenuates
aliasing products by 60dB; however, extremely sensi-
tive systems may still have to take precautions to avoid
aliasing errors. For more information, see the LTC1051/
LTC1053 data sheet.
Single Supply Operation
The LTC1100 will operate on a single 5V supply, and the
common-mode range of the internal op amps includes
ground; single supply operation is limited only by the
output swing of the op amps. The internal inverting
amplifier has a negative saturation limit of 5mV typically,
setting the minimum common-mode limit at 5mV/1.01 (or
1.1 for gain of 10). The inputs can be biased above ground
as shown in Figure 3. Low cost biasing components can be
used since any errors appear as a common-mode term
and are rejected.
The minimum differential input voltage is limited by the
swing of the output op amp. Lightly loaded, it will swing
down to 5mV, allowing differential input voltages as low as
50µV (450µV for gain of 10). Single supply operation
limits the LTC1100 to positive differential inputs only;
negative inputs will give a saturated zero output.
5V
RBIAS
SENSOR
5V
6+ 5
LTC1100
3
4, 1
8
OUTPUT
0V TO 5V
1N4148
LTC1100 • TA04
Figure 3.
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-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LT1100 (Linear Technology)
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LTC1100
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
J8 Package
8-Lead Ceramic DIP
CORNER LEADS OPTION
(4 PLCS)
0.290 – 0.320
(7.366 – 8.128)
0.008 – 0.018
(0.203 – 0.457)
0.385 ± 0.025
(9.779 ± 0.635)
0.045 – 0.068
(1.143 – 1.727)
FULL LEAD
OPTION
0° – 15°
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
0.200
(5.080)
MAX
0.015 – 0.060
(0.381 – 1.524)
0.045 – 0.068
(1.143 – 1.727)
0.014 – 0.026
(0.360 – 0.660)
0.125
3.175
0.100 ± 0.010 MIN
(2.540 ± 0.254)
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP OR TIN PLATE LEADS.
0.005
(0.127)
MIN
0.405
(10.287)
MAX
8 765
0.025
(0.635)
RAD TYP
0.220 – 0.310
(5.588 – 7.874)
1 234
0.300 – 0.320
(7.620 – 8.128)
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.325 –0.015
( )8.255
+0.635
–0.381
N8 Package
8-Lead Plastic DIP
0.045 – 0.065
(1.143 – 1.651)
0.065
(1.651)
TYP
0.045 ± 0.015
(1.143 ± 0.381)
0.100 ± 0.010
(2.540 ± 0.254)
0.130 ± 0.005
(3.302 ± 0.127)
0.125
(3.175)
MIN
0.020
(0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.400
(10.160)
MAX
87 65
0.250 ± 0.010
(6.350 ± 0.254)
12
34
0.005
(0.127)
RAD MIN
0.291 – 0.299
(7.391 – 7.595)
(NOTE 2)
0.010
(0.254
0.029
0.737)
×
45°
S Package
16-Lead Plastic SOL
0.093 – 0.104
(2.362 – 2.642)
0° – 8° TYP
0.037 – 0.045
(0.940 – 1.143)
0.398 – 0.413
(10.109 – 10.490)
(NOTE 2)
16 15 14 13 12 11 10
9
0.009 – 0.013
(0.229 – 0.330)
NOTE:
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
TYP
0.014 – 0.019
(0.356 – 0.482)
TYP
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS.
2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
0.004 – 0.012
(0.102 – 0.305)
NOTE 1
0.394 – 0.419
(10.007 – 10.643)
123 45678
8 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
LT/GP 0594 2K REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1994




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