GENERAL DESCRIPTION

The AD7291 is a 12-bit, low power, 8-channel, successive approximation analog-to-digital converter (ADC) with an internal temperature sensor.

The device operates from a single 3.3 V power supply and features an I2C-compatible interface. The device contains a 9- channel multiplexer and a track-and-hold amplifier than can handle frequencies up to 30 MHz. The device has an on-chip 2.5 V reference that can be disabled to allow the use of an external reference.

FEATURES

12-bit SAR ADC

8 single-ended analog input channels

Analog input range: 0 V to 2.5 V

12-bit temperature-to-digital converter

Temperature sensor accuracy of ±1°C typical

Channel sequencer operation

Specified for VDD of 2.8 V to 3.6 V

Logic voltage VDRIVE = 1.65 V to 3.6 V

Internal 2.5 V reference

I2C-compatible serial interface supports standard and

fast speed modes

Out of range indicator/alert function

Autocycle mode

Power-down current: 12 μA maximum

Temperature range: −40°C to +125°C

20-lead LFCSP package