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SAR ADCs offer wide temp range and 12V input range

Posted: 17 Aug 2011 ?? ?Print Version ?Bookmark and Share

Keywords:SAR ADC? industrial process? data acquisition?

Texas Instruments Inc. (TI) has launched two bipolar, 12bit, successive approximation register (SAR) 4-channel ADS8634 and 8-channel ADS8638 ADCs for industrial process controls (PLC) and data acquisition. TI said the devices provide the widest temperature range for demanding industrial measurement applications up to 125, and are fully characterized over the extended industrial temperature range.

The ADCs allow 12V input range that the company said is a 20 percent improvement against the competitionwhen used with an external reference. In addition, per-channel software-selectable input ranges support 12V, 10V, 5V, 2.5V, 0-5V and 0-10V, providing a single-chip solution for a wide range of inputs while enabling designers to easily interface to a variety of sensors with a single ADC. The devices also offer 1-MSPS sampling ratea 4x improvement from the previous generation and their digital interface supports 1.8C5V hosts without additional level-shifting circuitry. Integrated reference and temperature sensor reduces system cost and complexity. The addition of dual-alarm threshold logic per channel and alarm output also minimizes the number of host accesses required in monitoring applications.

TI offers a variety of tools and support to speed development with the ADS8634 and ADS8638, including an IBIS model, anti-aliasing filter tool for data converters and an op amp-to-ADC circuit topography calculator. Engineers can also ask questions and help solve problems in the Precision Data Converter Forum in the TI E2E Community.

A performance development kit, including all circuitry, software and source code, is also available to evaluate the performance of both parts. The ADS8638EVM-PDK enables complete ADC performance evaluation via ADCPro, a modular software system for evaluating ADCs without expensive logic analyzers and complex analysis routines. The ADS8638EVM-PDK can be purchased for a suggested retail price of $199.

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