Dual Matched Amplifiers with Digitally Programmable Gain in MSOP

The LTC6911 is a family of low noise digitally programmable gain amplifiers (PGAs) that are easy to use and occupy very little PC board space. The matched gain of both channels is adjustable using a 3-bit parallel interface to select voltage gains of 0, 1, 2, 5, 10, 20, 50 and 100V/ V (LTC6911-1) and 0, 1, 2, 4, 8, 16, 32 and 64V/V (LTC6911-2). All gains are inverting.

The LTC6911 family consists of two matched inverting 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, the LTC6911 family is offered in a 10-lead MSOP package.

Applications

* Data Acquisition Systems

* Dynamic Gain Changing

* Automatic Ranging Circuits

* Automatic Gain Control

* 3-Bit Digital Gain Control:

* (Inverting Gains of 0, 1, 2, 5, 10, 20, 50 and 100V/V) -1 Option

* (Inverting Gains of 0, 1, 2, 4, 8, 16, 32 and 64V/V) -2 Option

* Two Matched Programmable Gain Amplifiers

* Channel-to-Channel Gain Matching of 0.1dB (Max)

* Rail-to-Rail Input Range

* Rail-to-Rail Output Swing

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

* 11MHz Gain Bandwidth Product

* Input Noise: 10nV/√Hz

* Total System Dynamic Range to 120dB

* Input Offset Voltage: 2mV, Gain of 10

* Low Profile 10-Lead MSOP Package