1FEATURES

23• Selectable Input Range:

±10V, ±5V, ±2.5V, 0V to 10V, or

0V to 5V

Up to ±12V with External Reference

• No Latent Conversions Up to 1MSPS

• Outstanding Performance:

12 Bits No Missing Codes

INL: ±0.9LSB

SNR: 71.8dB

• Highly Integrated:

4- or 8-Channel Input Mux

Temperature Sensor

Internal Voltage Reference

Alarm Thresholds for Each Channel

• Low Power:

14.45mW at 1MSPS

5.85mW at 0.1MSPS

Flexible Power-Down Mode

• SPI™-Compatible Serial Interface

• Extended Temperature Range:

–40°C to +125°C

• Small Footprint: 4mm × 4mm QFN Package

APPLICATIONS

• Industrial Process Controls (PLC)

• Data Acquisition Systems

• High-Speed, Closed-Loop Systems

• Digital Power Supplies

DESCRIPTION

The ADS8634 and ADS8638 (ADS8634/8) are 12-bit

analog-to-digital converters (ADCs) capable of

measuring inputs up to ±10V at 1MSPS. Using a

successive approximation register (SAR) core, these ADCs provide a sample-and-hold front-end with no

latency in conversions. The ADS8634 includes an

input multiplexer (mux) for measuring up to four

inputs. The ADS8638 can measure up to eight inputs.

In addition to the input multiplexer, the ADS8634/8

feature an internal temperature sensor, voltage

reference, and a digital comparator for setting alarm

thresholds on each input; therefore, a minimal

amount of external components are required. A

simple SPI-compatible interface provides for

communication and control. The digital supply

operates from 5V all the way down to 1.8V for direct

connection to a wide range of processors and

controllers.

Ideal for demanding industrial measurement

applications, the ADS8634/8 are fully specified over

the extended industrial temperature range of –40°C

to +125°C and are available in a small form-factor

QFN-24 package.