GENERAL DESCRIPTION

The AD7715 is a complete analog front end for low frequency measurement applications. The part can accept low level input signals directly from a transducer and outputs a serial digital word. It employs a Σ-Δ conversion technique to realize up to 16 bits of no missing codes performance. The input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via the on-chip control register allowing adjustment of the filter cutoff and output update rate.

FEATURES

Charge-balancing ADC

16-bits no missing codes

0.0015 nonlinearity

Programmable gain front end

Gains of 1, 2, 32 and 128

Differential input capability

Three-wire serial interface

SPI-, QSPI™-, MICROWIRE™-, and DSP-compatible

Ability to buffer the analog input

3 V (AD7715-3) or 5 V (AD7715-5) operation

Low supply current: 450 µA maximum @ 3 V supplies

Low-pass filter with programmable output update

16-lead SOIC/PDIP/TSSOP

AD7715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AD7715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。