12-Bit 8-Channel Bipolar SAR With Software-Selectable Input Ranges
Product details
Parameters
Package | Pins | Size
Features
- 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
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.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | 12-Bit, 1MSPS, 4-/8-Chan, Bipolar-Input, SAR ADC w/ Software-Selectable Ranges datasheet (Rev. A) | Aug. 03, 2011 |
User guide | ADS8638EVM-PDK User Guide (Rev. A) | Feb. 02, 2016 | |
E-book | Best of Baker's Best: Precision Data Converters -- SAR ADCs | May 21, 2015 | |
Application note | Determining Minimum Acquisition Times for SAR ADCs, part 2 | Mar. 17, 2011 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
ADCPro™ is a modular software system for evaluating analog-to-digital converters (ADCs) without the need for expensive logic analyzers and complex analysis routines. Used alone it is suitable for performing analysis on data sets captured from ADC testing; when paired with a Texas Instruments (...)
Features
ADCPro software from Texas Instruments will simplify the tasks of collecting and analyzing ADC data, and ease evaluation. With it, you can easily set up an evaluation system that may not exactly replicate the manufacturer's system, but still arrive at meaningful results that can be compared to (...)
Description
The ADS8638EVM-PDK is designed to evaluate the ADS8614, ADS8618, ADS8634, and ADS8638 analog to digital converters. These 12/16-bit, four or eight channel, SAR converters offer multiple true bipolar and unipolar ranges in addition to a variety of alarm options. An LED is installed on the EVM board (...)
Features
- Contains all support circuitry needed for the ADS8638 family of parts
- Serial interface header to easily attach to TI DSP based communication systems
- Voltage reference options: ADC internal reference, onboard 2.5V reference, or external reference
- Onboard OPA140 to drive an ADC input channel
- LED used to (...)
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Features
- Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
- Noise calculations
- Common unit translation
- Solves common amplifier circuit design problems
- Gain selections using standard resistors
- Filter configurations
- Total noise for common amplifier configurations
- (...)
Reference designs
Design files
-
download TIDA-00119 BOM.zip (28KB) -
download TIDA-00119 PCB.pdf (998KB) -
download TIDA-00119 Gerber.zip (802KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
VQFN (RGE) | 24 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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