SAR ADCs
23 August 2011
TI’s bipolar, 12-bit, 1-MSPS, 4 and 8-channel SAR ADCs are for industrial process control.
Texas Instruments has introduced to the market two new bipolar, 12-bit, 1-MSPS successive approximation register (SAR) analogue-to-digital converters (ADCs) for programmable logic control (PLC) and data acquisition.
The 4-channel ADS8634 and 8-channel ADS8638 provide the widest temperature range available for demanding industrial measurement applications up to 125°C and are fully characterised over the extended industrial temperature range. They also allow an input range of ±12 V, an improvement of 20% over the competition, when used with an external reference.
Key features and benefits of the ADS8634 and ADS8638 are per-channel software-selectable input ranges that support ±12 V, ±10 V, ±5 V, ±2.5 V, 0-5 V, and 0-10 V, 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 1-MSPS sampling rate is a four-times improvement from the previous generation, and its digital interface supports 1.8 V to 5 V hosts without additional level-shifting circuitry. Integrated reference and temperature sensor reduces system cost and complexity, and the addition of dual-alarm threshold logic per channel and alarm output minimises 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 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 analysers and complex analysis routines.
The ADS8634 and ADS8638 are available now in a 4mm x 4mm QFN package.
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