Texas Instruments has introduced three new successive approximation register (SAR) analog-to-digital converters (ADCs) with wide analog supply and reference range. The ADS7947, ADS7948 and ADS7949 provide 2 MSps and 2-channel data conversion at 12-, 10- and 8-bit resolution, respectively, and were designed for applications such as portable data acquisition, X-Y positioning, battery monitoring, and instrumentation and control. The devices maintain high AC performance and low power consumption by delivering 72 dB of signal to noise ratio (SNR) at 7,5 mW power consumption. Additional power savings can be achieved with a power-down mode and power scaling to 8 μW/kSps for data rates under 500 kSps. Pseudo-differential inputs reduce the need for additional common-mode signal conditioning circuitry, and precision offset and gain over temperature eliminate calibration over temperature.
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