Texas Instruments ADS8688W Handleiding

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ADS868xW 16-Bit, 500kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs With

Bipolar Input Ranges

1 Features

•16-Bit ADCs with Integrated Analog Front-End

•4-, 8-Channel MUX with Auto and Manual Scan

•Channel-Independent Programmable Inputs:

–±12.288V, ±6.144V, and ±3.072V

–12.288V to 0V and 6.144V to 0V

•5V Analog Supply: 1.65V to 5V I/O Supply

•Constant Resistive Input Impedance: 1.2MΩ

•Input Overvoltage Protection: Up to ±20V

•On-Chip, 4.096V Reference with Low Drift

•Excellent Performance:

–500kSPS Aggregate Throughput

–DNL: ±0.6LSB; INL: ±0.8LSB

–Low Drift for Gain Error and Offset

–SNR: 91.5dB; THD: –102dB

–Low Power: 65mW

•AUX Input → Direct Connection to ADC Inputs

•ALARM → High and Low Thresholds per Channel

•SPI

™

-Compatible Interface with Daisy-Chain

•Industrial Temperature Range: –40°C to 125°C

Multiplexer

Oscillator

PGA

1.2M

OVP

1.2M

LPF

ADC

Driver

V

B0

AIN_0P

OVP

PGA

1.2M

OVP

1.2M

LPF

ADC

Driver

V

B1

AIN_1P

OVP

PGA

1.2M

OVP

1.2M

LPF

ADC

Driver

V

B2

AIN_2P

OVP

PGA

1.2M

OVP

1.2M

LPF

ADC

Driver

V

B3

AIN_3P

OVP

PGA

1.2M

OVP

1.2M

LPF

ADC

Driver

V

B4

AIN_4P

OVP

PGA

1.2M

OVP

1.2M

LPF

ADC

Driver

V

B5

AIN_5P

OVP

PGA

1.2M

OVP

1.2M

LPF

ADC

Driver

V

B6

AIN_6P

OVP

PGA

1.2M

OVP

1.2M

LPF

ADC

Driver

V

B7

AIN_7P

OVP

AUX_INP

SAR ADC

Digital

Logic

and

Interface

4.096V

Reference

REFGND

DGNDAGND

DVDD

AVDD

Additional Channels in ADS8668W

ADS8688W

ADS8684W

AIN_0M

AIN_1M

AIN_2M

AIN_3M

AIN_4M

AIN_5M

AIN_6M

AIN_7M

AUX_GND

CS

SCLK

SDI

SDO

DAISY

REFSEL

RST / PD

REFCAP

REFIO

Block Diagram

2 Applications

•Analog input modules

•AC transmission relays

3 Description

The ADS8684W and ADS8688W are 4-channel and

8-channel, integrated data acquisition systems based

on a 16-bit successive approximation (SAR) analog-

to-digital converter (ADC), operating at a throughput

of 500kSPS. The devices feature integrated analog

front-end circuitry for each input channel with

overvoltage protection up to ±20V, a 4-channel or

8-channel multiplexer with automatic and manual

scanning modes, and an on-chip, 4.096V reference

with low temperature drift. Operating on a single 5V

analog supply, each input channel on the devices

can independently support bipolar input ranges of

±12.288V, ±6.144V, and ±3.072V and unipolar input

ranges of 12.288V to 0V and 6.144V to 0V.

The ADS8684W and ADS8688W offer a simple SPI-

compatible serial interface to the digital host and also

support daisy-chaining of multiple devices. The digital

supply operates from 1.65V to 5.25V, enabling direct

interface to a wide range of host controllers.

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

ADS8684W,

ADS8688W

DBT (TSSOP, 38)9.70mm × 6.40mm

(1)For more information, see Section 12.

(2)The package size (length x width) is a nominal value and

includes pins, where applicable.

ADS8688W

SBASBC4 – DECEMBER 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Product specificaties