ADS8699IPWR datasheet(22/74 Pages) TI2

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7 Detailed Description

7.1 Overview

The ADS869x devices belong to a family of high-speed, high-performance, easy-to-use integrated data

acquisition system. This single-channel device supports true bipolar input voltage swings up to ±12.288 V,

operating on a single 5-V analog supply. The device features an enhanced SPI interface (multiSPI) that allows

the sampling rate to be maximized even with lower speed host controllers.

The device consists of a high-precision successive approximation register (SAR) analog-to-digital converter

(ADC) and a power-optimized analog front-end (AFE) circuit for signal conditioning that includes:

• A high-resistive input impedance (≥ 1 MΩ) that is independent of the sampling rate

• A programmable gain amplifier (PGA) with a pseudo-differential input configuration supporting nine software-

programmable unipolar and bipolar input ranges

• A second-order, low-pass antialiasing filter

• An ADC driver amplifier that ensures quick settling of the SAR ADC input for high accuracy

• An input overvoltage protection circuit up to ±20 V

The device also features a low temperature drift, 4.096-V internal reference with a fast-settling buffer and a

multiSPI serial interface with daisy-chain (DAISY) and ALARM features.

The integration of the precision AFE circuit with high input impedance and a precision ADC operating from a

single 5-V supply offers a simplified end solution without requiring external high-voltage bipolar supplies and

complicated driver circuits.

7.2 Functional Block Diagram

Oscillator

CONVST/CS

PGA

1 M:

OVP

1 M:

OVP

nd-Order

LPF

ADC

Driver

VBIAS

AIN_P

AIN_GND

4.096-V

Reference

REFGND

DGND

AGND

DVDD

AVDD

Digital Logic

and Interface

REFIO

REFCAP

SCLK

SDI

SDO

18-Bit

SAR ADC

ADS869x

ADS8691, ADS8695, ADS8699

SBAS777B – DECEMBER 2016 – REVISED MARCH 2021

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Product Folder Links: ADS8691 ADS8695 ADS8699

ADS8699IPWR Datasheet(PDF) 22 Page - Texas Instruments

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