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.