Texas Instruments ADS8661W Handleiding

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ADS8661W 12-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System

With Programmable Bipolar Input Ranges

1 Features

•12-bit ADC with integrated analog front-end

•High speed: 1.25MSPS

•Software programmable input ranges:

–Bipolar differential ranges: ±12.288V, ±10.24V,

±6.144V, ±5.12V, and ±2.56V

–Unipolar differential ranges: 0V–12.288V, 0V–

10.24V, 0V–6.144V, and 0V–5.12V

•Analog supply (5V): 1.65V to 5V I/O supply

•Constant resistive input impedance ≥ 1MΩ

•Input bandwidth: 450kHz

•Input overvoltage protection: Up to ±20V

•On-chip, 4.096V reference with low drift

•Excellent performance:

–DNL: ±0.1LSB; INL: ±0.15LSB

–SNR: 74dBFS; THD: –102dB

•ALARM feature with high, low threshold

•multiSPI

™

interface with daisy-chain

•Extended industrial temperature range:

––40°C to +125°C

2 Applications

•Analog input modules

•Semiconductor tests

•Servo drive control modules

3 Description

The ADS8661W is an integrated data acquisition

system based on a successive approximation (SAR)

analog-to-digital converter (ADC) topology. The

device features a high-speed, high-precision SAR

ADC, integrated differential analog front-end (AFE)

input driver circuit. The ADS8661W includes an

overvoltage protection circuit up to ±20V and an on-

chip 4.096V reference with extremely low temperature

drift.

The device operates on a single 5V analog supply,

but support true bipolar input ranges and unipolar

input ranges. The bipolar input ranges are ±12.288V,

±6.144V, ±10.24V, ±5.12V, and ±2.56V, and the

unipolar input ranges are from 0V to 12.288V, 10.24V,

6.144V, and 5.12V. The devices offer a high resistive

input impedance (≥ 1MΩ) irrespective of the selected

input range.

The multiSPI digital interface is backward-compatible

to the traditional SPI protocol. Additionally,

configurable features simplify interface to a wide

range of host controllers.

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

ADS8661WRUM (WQFN, 16)4mm × 4mm

(1)For more information, see the Mechanical, Packaging, and

Orderable Information.

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

includes pins, where applicable.

Oscillator

CONVST/CS

PGA

1 M

OVP

1 M

OVP

2

nd

-Order

LPF

ADC

Driver

V

BIAS

AIN_P

AIN_M

4.096-V

Reference

REFGND

DGNDAGND

DVDD

AVDD

Digital Logic

and Interface

REFIO

REFCAP

SCLK

SDI

SDO

12-Bit

SAR ADC

ADS868x

Block Diagram

ADS8661W

SBASB35 – JANUARY 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