【技术应用笔记】使用AD771x系列24位Σ-ΔADC

简介

AD771x 系列是一组专为低频、高精度工业传感器应用而设计

的 ADC,图 1 显示了这些器件之一的框图。模拟前端在某些

情况下还包括传感器激励源,并且接受低电平信号,在信号

施加于 Σ-Δ 调制器前可通过内部可编程增益放大器进行放大。

出现在该调制器输出端的脉冲流施加于数字滤波器,从而产

生经过低通滤波的高分辨率串行输出。

of one of these devices. The analog front end, which in

some cases also includes excitation sources for sensors,

accepts low level signals that can be amplified by the

internal programmable gain amplifier before being

applied to a sigma-delta modulator. The pulse stream

appearing at the output of this modulator is applied to a

digital filter which produces a low-pass filtered, high

resolution, serial output.

∑-∆

MODULATOR

DIGITAL

FILTER

SERIAL

OUTPUT

AIN(+)

AIN(–)

PGA

AD771x

Figure 1. AD771x Block Diagram 图 1. AD771x 框图

some cases also includes excitation sources for sensors,

accepts low level signals that can be amplified by the

internal programmable gain amplifier before being

applied to a sigma-delta modulator. The pulse stream

appearing at the output of this modulator is applied to a

digital filter which produces a low-pass filtered, high

resolution, serial output.

∑-∆

MODULATOR

DIGITAL

FILTER

SERIAL

OUTPUT

AIN(+)

AIN(–)

PGA

AD771x

Figure 1. AD771x Block Diagram

TYPICAL APPLICATIONSa APPLICATION NOTEAPPLICATIONONE TECHNOLOGY WAYP.O. BOX 9106NORWOOD, MASSACHUSETTS NOTE02062-9106617/329-4700ONE TECHNOLOGY WAY P.O. BOX 9106NORWOOD,MASSACHUSETTS 02062-9106 617/329-4700AN-406应用笔记 Using theONE TECHNOLOGYWAYAD771x Family P.O. BOX of 24-Bit Sigma-Delta