New from Texas Instruments are two bipolar, 12-bit, 1 MSps 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 provide a wide temperature range 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 when used with an external reference.
Per-channel, software selectable input ranges 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 digital interface supports 1,8 V to 5 V hosts without additional level-shifting circuitry. An integrated reference and temperature sensor reduces system cost and complexity, while 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 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 analysers and complex analysis routines.
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