Texas Instruments has a family of zero-drift programmable gain amplifiers (PGA) with single-ended input, single-supply operation, rail-to-rail I/O and multi-channel multiplexers (MUX).

The PGA112 and PGA116 offer binary gains of 1, 2, 4, 8, 16, 64, and 128 while the PGA113 and PGA117 have scope gains of 1, 2, 5, 10, 20, 50, 100 and 200. Programmable gains allow for optimum matching of the sensor output to an analogue-to-digital converter (ADC) input voltage range.

The PGA112 and PGA113 have a two-channel MUX, and the PGA116 and PGA117 have a ten-channel MUX. The op amp output stage can be powered by the same power supply as the ADC, which is useful in multi-supply systems to prevent an over-voltage/lockup condition on an ADC input.

Gain switching time is 200ns and gain settling is 2.55[micro]s at 0.01%.

For all of the devices, DC gain error is 0.1% (max with G less than or equal to 32) over temperature.

All devices use a standard SPI serial interface with daisy-chain capability.

More information: www.ti.com/analogelab