ADS7949SRTER集成电路（IC）的模数转换器（ADC）规格书PDF中文资料

ADS7949SRTER属于集成电路（IC）的模数转换器（ADC）。由德州仪器制造生产的ADS7949SRTER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。

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.