GENERAL DESCRIPTION

The AD7938/AD7939 are 12-bit and 10-bit,high speed,low power,successive approximation (SAR) ADCs. The parts operate from a single 2.7 V to5.25 V power supply and feature throughput rates up to1.5 MSPS.The parts contain a low noise, wideband width,differential track-and-hold amplifier that can handle input frequencies up to50 MHz.

FEATURES

Fast throughput rate:1.5 MSPS

Specified for VDDof 2.7 V to 5.25 V

Low power

6 mW max at 1.5 MSPS with 3 V supplies

13.5 mWmax at1.5 MSPS with5 V supplies

8 analog input channels with a sequencer

Software configurable analoginputs

8-channel single-ended inputs

4-channel fully differential inputs

4-channel pseudo-differential inputs

7-channel pseudo-differential inputs

Accurate on-chip 2.5 V reference

±0.2 max@ 25°C, 25 ppm/°C max

70 dB SINAD at50 kHz input frequency

Nopipeline delays

High speed parallel interface—word/byte modes

Full shutdown mode: 2 µA max

32-leadLFCSP and TQFP package

AD7938BSUZ属于集成电路（IC） > 模数转换器（ADC）。亚德诺半导体技术有限公司制造生产的AD7938BSUZ模数转换器（ADC）模数转换器（ADC、A/D 或 A 转 D）对模拟信号进行采样，例如由麦克风采集的声音或传感器的输出，然后将其转换为数字信号。一般来说，数字输出是二进制补码二进制数，与输入成比例。输入类型可能是差分、伪差分或单端输入。模数转换器可按照位数、采样率、输入数、接口、转换器数和架构（例如自适应增量、双斜率、折叠、流水线、SAR、三角积分、两步式）进行选择。