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ADCs reduce system power consumption

Dallas, Tex. — Texas Instruments Inc. (TI) has introduced four low-power analog-to-digital converters (ADCs) 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 (SAR) ADC with inherent sample and hold and a conversion clock.

The ADCs 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 provide a 2-to-1 input multiplexer that allows each ADC to digitize two channels, which reduces 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, said TI.

The devices are said to offer improved accuracy for high dynamic range signals and exceptional signal-to-noise ratio. The ADCs use 13.7 mW at 1 MSPS with a 3-V supply and are specified over the industrial temperature range of -40°C to 85°C.

The ADCs are compatible with the ADS8329 and ADS8330, which consume only 15.5 mW and also offer 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.

Pricing: All in quantities of 1,000.

  • ADS7229 (single-input, 12 bits, +/-0.5 LSB max. INL/DNL, 73.9 dB SNR, -88.5 dB THD, 93.4 dB SFDR): $2.30
  • ADS7230 (dual-input, 12 bits, +/-0.5 LSB max. INL/DNL, 73.9 dB SNR, -88.5 dB THD, 93.4 dB SFDR): $2.50
  • ADS7279 (single-input, 14 bits, +/-1.0 LSB max. INL/DNL, 85.9 dB SNR, -100.1 dB THD, 105.3 dB SFDR): $4.20
  • ADS7280 (dual-input, 14 bits, +/-1.0 LSB max. INL/DNL, 85.9 dB SNR, -100.1 dB THD, 105.3 dB SFDR): $4.50

Availability: The ADS7229, ADS7230, ADS7279 and ADS7280 are available now in 16-pin, 4 x 4-mm QFN and 16-pin TSSOP packages.
Product information: ADS72xx ADCs

Texas Instruments , 1-800-477-8924, www.ti.com

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