LT6372-1

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Precision Instrumentation Amplifier with

Level Shift and Output Clamping

The LT®6372-1 is a gain programmable, high precision

instrumentation amplifier that delivers industry leading

DC precision. This high precision enables smaller sig-

nals to be sensed and eases calibration requirements,

particularly over temperature. The LT6372-1 incorporates

features into the LT6370 which further improve accuracy

and simplify interfacing to an ADC.

The LT6372-1 uses a proprietary high performance bipo-

lar process which enables industry leading accuracy cou-

pled with exceptional long-term stability. The LT6372-1

is laser trimmed for very low input offset voltage (60µV)

and high CMRR (86dB, G = 1). Proprietary on-chip test

capability allows the gain drift (35ppm/°C) to be guaran-

teed with automated testing.

The LT6372-1’s difference amplifier uses a split reference

configuration which simplifies level shifting the amplifier’s

output to the center of the ADC’s input range. Output

clamp pins are also provided to limit the voltage which can

be applied to an ADC’s input. EMI filtering is integrated on

the LT6372-1’s inputs to maintain accuracy in the pres-

ence of harsh RF interference.

The LT6372-1 is available in a compact MS16E or a 20-pin

3mm x 4mm QFN. The LT6372-1 is fully specified over the

–40°C to 85°C and –40°C to 125°C temperature ranges.

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Single Gain Set Resistor: G = 1 to >1000

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Excellent DC Precision

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Input Offset Voltage: 60μV Max

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Input Offset Voltage Drift: 0.6μV/°C Max

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Low Gain Error: 0.01% Max (G = 1)

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Low Gain Drift: 35ppm/°C Max (G > 1)

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High DC CMRR: 86dB Min (G = 1)

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Integrated Output Clamps

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Integrated Output Level Shift

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Input Bias Current: 800pA Max

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3.1MHz –3dB Bandwidth (G = 1)

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Low Noise:

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1kHz Voltage Noise: 7nV/√Hz

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Integrated Input RFI Filter

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Wide Supply Range 4.75V to 35V

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Temperature Ranges: –40°C to 85°C and –40°C to 125°C

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MS16E and 20-Lead 3mm × 4mm QFN Packages

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350

350

350

350

10V

+15V

GAIN OF 100 BRIDGE AMPLIFIER

6372-1 TA01a

243

10nF

COG

REF1

+

–

LT6372-1

LTC6655-5

LTC2367-16

REF

REF2

CLLO

CLHI

VDD

2.5V

91

GND

–15V

LT6372–1 Driving LTC2367–16 with

Level Shift and Output Clamping

APPLICATIONS

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Bridge Amplifier

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Data Acquisition

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Thermocouple Amplifier

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Strain Gauge Amplifier

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Medical Instrumentation

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Transducer Interfaces

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Differential to Single-Ended Conversion

Level Shifted

to VREF/2

Output

Clamped

Negative

Output

Clamped

Positive

G = 100

–100 –75 –50 –25

0

25

50

75 100

–1

0

1

2

3

4

5

6

0

13107

26214

39322

52428

65536

with Level–Shift and Output Clamping

LT6372–1 Driving LTC2369–18

63721 TA01b