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SAR ADCs allow 12V input range

Posted: 25 Aug 2011 ?? ?Print Version ?Bookmark and Share

Keywords:SAR? ADCs? programmable logic control?

Texas Instruments Inc. has rolled out two bipolar, 12bit, 1MSPS successive approximation register (SAR) analog-to-digital converters (ADCs) for programmable logic control (PLC) and data acquisition.

The 4-channel ADS8634 and 8-channel ADS8638 offer wide temperature range available for demanding industrial measurement applications up to 125C and are characterised over the extended industrial temperature range. They also allow an input range of 12V, an improvement of 20 percent over the competition, when used with an external reference.

Both the ADS8634 and ADS8638 have per-channel software-selectable input ranges support 12V, 10V, 5V, 2.5V, 0-5V and 0-10V, providing a single-chip solution for a range of inputs, while enabling designers to interface to a variety of sensors with a single ADC.

ADS8634 and ADS8638

The ADS8634 and ADS8638 offer wide temperature range available for demanding industrial measurement applications.

The devices' 1MSPS sampling rate is a 4x improvement from previous generation products of the same category. The digital interfaces of the ADS8634 and ADS8638 support 1.8C5V hosts without additional level-shifting circuitry. They both have integrated reference and temperature sensor reduces system cost and complexity. The addition of dual-alarm threshold logic per channel and alarm output 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.

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 today for a suggested retail price of $199.

The ADS8634 and ADS8638 are available now in a 4 x 4mm QFN package. The ADS8634 can be purchased for a suggested retail price of $2.85 for 1,000 units, and the ADS8638 is available for a suggested retail price of $3.25 for 1,000 units.

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