LTC6915

1

6915f

APPLICATIO S

DESCRIPTIO

FEATURES

TYPICAL APPLICATIO

s

14 Levels of Programmable Gain

s

125dB CMRR Independent of Gain

s

Gain Accuracy 0.1% (Typ)

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Maximum Offset Voltage of 10

µV

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Maximum Offset Voltage Drift: 50nV/

°C

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Rail-to-Rail Input and Output

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Parallel or Serial (SPI) Interface for Gain Setting

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Supply Operation: 2.7V to

±5.5V

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Typical Noise: 2.5

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16-Lead SSOP and 12-Lead DFN Packages

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Thermocouple Amplifiers

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Electronic Scales

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Medical Instrumentation

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Strain Gauge Amplifier

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High Resolution Data Acquisition

Zero Drift, Precision

Instrumentation Amplifier with

Digitally Programmable Gain

The LTC

mentation amplifier. The gain can be programmed to 0, 1,

2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, or 4096

through a parallel or serial interface. The CMRR is typically

125dB with a dual 5V supply with any programmed gain.

The offset is below 10

µV with a temperature drift of less

than 50nV/

°C.

The LTC6915 uses charge balanced sampled data tech-

niques to convert a differential input voltage into a single

ended signal that is in turn amplified by a zero-drift

operational amplifier.

The differential inputs operate from rail-to-rail and the

single-ended output swings from rail-to-rail. The LTC6915

can be used in single power supply applications as low as

2.7V, or with dual

±5V supplies. The LTC6915 is available

in a 16-lead SSOP package and a 12-lead DFN surface

mount package.

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

Differential Bridge Amplifier with Gain Programmed through the Serial Interface

–

+

3V

RESISTOR

ARRAY

MUX

4-BIT

LATCH

Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7

8-BIT

SHIFT-REGISTER

HOLD_THRU

µP

TO OTHER

DEVICES

CS(D0)

CLK(D2)

PARALLEL_SERIAL

IN

_

3

2

11

6

7

8

9

R < 10k

LTC6915 SSOP PACKAGE

0.1

µF

SHDN

DGND

13

5

16

10

1

4

OUT

REF

15

14

6915 TA01

SENSE

3V