Texas Instruments Incorporated today introduced four low-power analog-to-digital converters that reduce power consumption while providing high performance for precision applications. The 12-bit ADS7229 and ADS7230 and the 14-bit ADS7279 and ADS7280 combine a 1-MSPS successive approximation register ADC with inherent sample and hold and a conversion clock. The devices are designed for applications that require excellent AC and DC performance, high sampling rates and the lowest power consumption, such as portable medical instruments, multi-channel data acquisition systems and automated test equipment.
The ADS7229 and ADS7279 feature a single unipolar input for applications requiring a single data converter per channel. The ADS7230 and ADS7280 have a 2-to-1 input multiplexer that allows each ADC to digitize two channels, thereby reducing component count and board size. All four offer a SPI-compatible interface to minimize board space and simplify connection to the host device to enable increased channel densities and a smaller overall system footprint.
The devices offer improved accuracy for high dynamic range signals and exceptional signal-to-noise ratio. The new ADCs use 13.7 mW at 1 MSPS with a 3-V supply and are specified over the industrial temperature range of -40C to 85C. (See table below for additional product features.)
The ADCs are compatible with the ADS8329 and ADS8330 which consume only 15.5 mW and also have advanced onboard power-saving features that allow them to scale with sampling rate. The ADS7279 and ADS7280 are drop-in pin compatible with the ADS7229 and ADS7230, as well as the 16-bit ADS8329 and ADS8330. This family of ADCs works well with TI’s OPA365 operational amplifier and REF3240 and REF3225 precision voltage references.