AD7938屬于集成電路（IC）的模數(shù)轉(zhuǎn)換器（ADC）。由亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的AD7938模數(shù)轉(zhuǎn)換器（ADC）模數(shù)轉(zhuǎn)換器（ADC、A/D 或 A 轉(zhuǎn) D）對模擬信號進行采樣，例如由麥克風(fēng)采集的聲音或傳感器的輸出，然后將其轉(zhuǎn)換為數(shù)字信號。一般來說，數(shù)字輸出是二進制補碼二進制數(shù)，與輸入成比例。輸入類型可能是差分、偽差分或單端輸入。模數(shù)轉(zhuǎn)換器可按照位數(shù)、采樣率、輸入數(shù)、接口、轉(zhuǎn)換器數(shù)和架構(gòu)（例如自適應(yīng)增量、雙斜率、折疊、流水線、SAR、三角積分、兩步式）進行選擇。

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