LTC6912IGN-2 datasheet(1/24 Pages) LINER

Part #	LTC6912IGN-2

Description	Dual Programmable Gain Amplifiers with Serial Digital Interface

PDF	24 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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1 / 24 page

LTC6912

1

6912fa

FEATURES

TYPICAL APPLICATIO

■ 2 Channels with Independent Gain Control

LTC6912-1: (0, 1, 2, 5, 10, 20, 50, and 100V/V)

LTC6912-2: (0, 1, 2, 4, 8, 16, 32, and 64V/V)

■ Offset Voltage = 2mV Max (–40

°C to 85°C)

■ Channel-to-Channel Gain Matching of 0.1dB Max

■ 3-Wire SPI

TM Interface

■ Extended Gain-Bandwidth at High Gains

■ Wired-OR Outputs Possible (2:1 Analog MUX

Function)

■ Low Power Hardware Shutdown (GN-16 Only,

2

µA Max at 2.7V)

■ Rail-to-Rail Input Range

■ Rail-to-Rail Output Swing

■ Single or Dual Supply: 2.7V to 10.5V Total

■ Input Noise: 12.6nV/

√Hz

■ Total System Dynamic Range to 115dB

■ 16-Pin GN (SSOP) or 12-Pin DFN Package Options

■ Data Acquisition Systems

■

Dynamic Gain Changing

■ Automatic Ranging Circuits

■

Automatic Gain Control

Dual Programmable

Gain Amplifiers with

Serial Digital Interface

The LTC

®6912 is a family of dual channel, low noise,

digitally programmable gain amplifiers (PGA) that are

easy to use and occupy very little PC board space. The

gains for both channels are independently programmable

using a 3-wire SPI interface to select voltage gains of 0, 1,

2, 5, 10, 20, 50, and 100V/V (LTC6912-1 ); and 0, 1, 2, 4,

8, 16, 32, and 64V/V (LTC6912-2). All gains are inverting.

The LTC6912 family consists of 2 matched amplifiers with

rail-to-rail outputs. When operated with unity gain, they

will also process rail-to-rail input signals. A half-supply

reference generated internally at the AGND pin supports

single power supply applications. Operating from single

or split supplies from 2.7V to 10.5V total, the LTC6912-X

family is offered in tiny SSOP and DFN-12 Packages.

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

INA

AGND

INB

1

µF

0.1

µF

VINA

VINB

VOUTA = GAINA • VINA

VOUTB = GAINB • VINB

OUT A

OUT B

LTC6912-X

V+

3V

V–

SHDN

CS/LD

DATA

CLK

SHDN

CS/LD

DIN

5

6

7

8

10

9

DGND

DOUT

2

12

14

3

4

15

13

CHB

CHA

3-WIRE

SPI

INTERFACE

6912 TA01a

FREQUENCY (kHz)

0.1

40

30

20

10

0

–10

1

10

100

1000

6912 TA01b

10000

GAIN OF 64

GAIN OF 32

GAIN OF 16

GAIN OF 8

GAIN OF 4

GAIN OF 2

GAIN OF 1

VS = ±2.5V

VIN = 10mVRMS

LTC6912-2

Frequency Response

A Dual, Matched Low Noise PGA (16-Lead SSOP Package)

DESCRIPTIO

All other trademarks are the property of their respective owners.

APPLICATIO S

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