1

LT1920

Single Resistor Gain

Programmable, Precision

Instrumentation Amplifier

The LT

amplifier that requires only one external resistor to set gains

of 1 to 10,000. The low voltage noise of 7.5nV/

√Hz (at 1kHz)

is not compromised by low power dissipation (0.9mA typical

for

±2.3V to ±15V supplies).

The high accuracy of 30ppm maximum nonlinearity and

0.3% max gain error (G = 10) is not degraded even for load

resistors as low as 2k (previous monolithic instrumentation

amps used 10k for their nonlinearity specifications). The

LT1920 is laser trimmed for very low input offset voltage

(125

µV max), drift (1µV/°C), high CMRR (75dB, G = 1) and

PSRR (80dB, G = 1). Low input bias currents of 2nA max are

achieved with the use of superbeta processing. The output

can handle capacitive loads up to 1000pF in any gain configu-

ration while the inputs are ESD protected up to 13kV (human

body). The LT1920 with two external 5k resistors passes the

IEC 1000-4-2 level 4 specification.

The LT1920, offered in 8-pin PDIP and SO packages, is a pin

for pin and spec for spec improved replacement for the

AD620. The LT1920 is the most cost effective solution for

precision instrumentation amplifier applications. For even

better guaranteed performance, see the LT1167.

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Single Gain Set Resistor: G = 1 to 10,000

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Gain Error: G = 10, 0.3% Max

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Gain Nonlinearity: G = 10, 30ppm Max

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Input Offset Voltage: G = 10, 225

µV Max

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Input Offset Voltage Drift: 1

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Input Bias Current: 2nA Max

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PSRR at G = 1: 80dB Min

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CMRR at G = 1: 75dB Min

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Supply Current: 1.3mA Max

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Wide Supply Range:

±2.3V to ±18V

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1kHz Voltage Noise: 7.5nV/

√Hz

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0.1Hz to 10Hz Noise: 0.28

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Available in 8-Pin PDIP and SO Packages

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Meets IEC 1000-4-2 Level 4 ESD Tests with

Two External 5k Resistors

, LTC and LT are registered trademarks of Linear Technology Corporation.

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Bridge Amplifiers

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Strain Gauge Amplifiers

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Thermocouple Amplifiers

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Differential to Single-Ended Converters

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Medical Instrumentation

OUTPUT VOLTAGE (2V/DIV)

G = 1000

1167 TA02

Gain Nonlinearity

Single Supply Barometer

–

+

+

–

2

1

1

1

1

2

R5

392k

R4

50k

R3

50k

R8

100k

R6

1k

LT1634CCZ-1.25

8

4

1/2

LT1490

3

5k

5k

5k

5k

5

4

3

2

–

+

7

1/2

LT1490

5

6

2

8

LUCAS NOVA SENOR

NPC-1220-015-A-3L

7

6

1920 TA01

5

TO

4-DIGIT

DVM

4

R2

12

Ω

LT1920

G = 60

R1

825

Ω

3

6

R7

50k

VOLTS

2.800

3.000

3.200

INCHES Hg

28.00

30.00

32.00

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO