概述

The LTC6912IGN-1#PBF 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.

特点

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 SPITM Interface

Extended Gain-Bandwidth at High Gains

Wired-OR Outputs Possible (2:1 Analog MUX Function)

Low Power Hardware Shutdown (GN-16 Only, 2μA 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

应用

Data Acquisition Systems

Dynamic Gain Changing

Automatic Ranging Circuits

Automatic Gain Control