1 Features

1• Sample rate: 2 MSPS

• Pin-compatible family: 12-, 10-, 8-bit

• High resolution, high throughput:

– ADS7947: 12 bit, 2.1 MSPS

– ADS7948: 10 bit, 2.57 MSPS

– ADS7949: 8 bit, 3 MSPS

• Excellent performance:

– No missing codes

– INL: 1 LSB (max)

– SNR: 72 dB (min)

• Low power:

– 7.5 mW at 2-MSPS operation

– Auto power-down at lower speeds:

– 3.8 mW at 500 kSPS

– 0.8 mW at 100 kSPS

– 0.16 mW at 20 kSPS

• Wide supply range:

– Analog: 2.7 V to 5.5 V

– Digital: 1.65 V to AVDD

• SPI-compatible serial interface

• Extended temperature range: –40°C to +125°C

• Tiny footprint: 3-mm × 3-mm WQFN

2 Applications

• Communication systems

• Optical networking

• Medical instrumentation

• Battery-powered equipment

• Data acquisition systems

3 Description

The ADS7947, ADS7948, and ADS7949 are pincompatible

12-bit, 10-bit, and 8-bit, 2-MSPS, analogto-

digital converters (ADCs), respectively. The

devices operate at a 2-MSPS sample rate with a

standard 16 clock data frame. In addition, the

ADS7947 (12-bit) can be operated at 2.1 MSPS, the

ADS7948 (10-bit) at 2.57 MSPS, and the ADS7949

(8-bit) at 3 MSPS with a short data frame optimized

for the number of clocks sufficient for conversion with

no drop in performance. The devices feature both

outstanding dc precision and excellent dynamic

performance. This family of pin-compatible devices

includes a two-channel input multiplexer and a lowpower

successive approximation register (SAR) ADC.

The ADS7947, ADS7948, and ADS7949 support a

wide analog supply range that supports the full-scale

input range up to 5 V. A simple SPI digital interface,

with a digital supply that can operate as low as 1.65

V, allows for easy interfacing to a wide variety of

digital controllers. Automatic power-down can be

enabled when operating at slower speeds to

dramatically reduce power consumption.

Offered in a tiny 3-mm × 3-mm WQFN package, the

ADS7947, ADS7948, and ADS7949 are fully

specified over the extended temperature range of

–40°C to +125°C and are suitable for a wide variety

of data acquisition applications where high

performance, low power, and small size are key.