Data-acquisition SoC adds zooming capability - Embedded.com

Data-acquisition SoC adds zooming capability

The SX8801R is an ultra low power, high-resolution system-on-chip (SoC) for data acquisition from micro-electro-mechanical systems (MEMS) sensors in battery-powered consumer, medical, and industrial systems. Developed by Semtech, the device features the company's ZoomingADC capability that combines a 16-bit analog-to-digital converter (ADC) with a 10-bit preamplifier to allow the device to “zoom in” or amplify a small portion of the analog signal and apply the full 16-bit ADC to that part of the signal. ZoomingADC compensates for large offsets without saturation or resolution losses, and can be re-focused on different parts of a signal for different applications.

The SX8801R also includes a microprocessor and 22 kbytes of ROM, with the output sent to either a serial link or to an LCD. The part directly reads pressure, temperature, magnetic, chemical, or other Wheatstone bridge-based sensors, ranging from 2 mV to 5 V. With a reference, the device can also access most voltage-generating sensors. An input voltage range from 2.4 to 5.5 V can be employed.

The device has three pre-amplifiers and special logic-block power gating features so designers can specify power consumption for the data acquisition phase in a range between 200 and 800 μA depending upon the number of pre-amps used. At 2 kHz, the ADC function draws only 200 μA.

The SX8801R is available in a 12- by 12-mm lead-free LQFP-44 package or as a 4.1- by 4.6-mm die. For more information, contact Semtech at www.semtech.com.

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