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GENERAL DESCRIPTION

The AD7091R-2/AD7091R-4/AD7091R-8 family is a multichannel 12-bit, ultralow power, successive approximation analog-to-digital converter (ADC) that is available in two, four, or eight analog input channel options. The AD7091R-2/AD7091R-4/AD7091R-8 operate from a single 2.7 V to 5.25 V power supply and are capable of achieving a sampling rate of 1 MSPS.

FEATURES

Ultralow system power

Flexible power/throughput rate management

Normal mode

1.4 mW at 1 MSPS

Power-down mode

550 nA typical at VDD = 5.25 V

435 nA typical at VDD = 3 V

Programmable ALERT interrupt pin (4-/8-channel models)

High performance

1 MSPS throughput with no latency/pipeline delay

SNR: 70 dB typical at 10 kHz input frequency

THD: ?80 dB typical at 10 kHz input frequency

INL: ±0.7 LSB typical, ±1.0 LSB maximum

Small system footprint

On-chip accurate 2.5 V reference, 5 ppm/°C typical drift

MUXOUT/ADCIN to allow single buffer amplifier

Daisy-chain mode

16-lead, 20-lead, and 24-lead 4 mm × 4 mm LFCSP packages

16-lead, 20-lead, and 24-lead TSSOP packages

Easy to use

SPI/QSPI?/MICROWIRE?/DSP compatible digital interface

Integrated programmable channel sequencer

BUSY indication available (4-/8-channel models)

Built in features for control and monitoring applications

GPOx pins available (4-/8-channel models)

Wide operating range

Temperature range: ?40°C to +125°C

Specified for VDD of 2.7 V to 5.25 V

APPLICATIONS

Battery-powered systems

Personal digital assistants

Medical instruments

Mobile communications

Instrumentation and control systems

Data acquisition systems

Optical sensors

Diagnostic/monitoring functions