5/1/2003 - Texas Instruments (TI) Incorporated (NYSE: TXN) announced a low-power data acquisition system (DAS) from the company´s Burr-Brown product line which provides complete signal conditioning and conversion. This easy-to-use device is ideal for portable and battery-powered systems, low-power control systems, smart sensor applications and general-purpose instrumentation.
The low-priced ADS7871 offers customers system processing capability and built-in flexibility by integrating a 14-bit, 48k Samples/s successive approximation (SAR) analog-to-digital converter, four-channel differential/eight-channel single-ended multiplexer (MUX), programmable gain amplifier (PGA), precision voltage reference, reference buffer amplifier, on-board clock generator and serial interface for control and data retrieval.
"The ADS7871 is the industry's only SAR-based data acquisition system which surpasses the 12-bit resolution level. A SAR-based DAS offers low latency at much lower power consumption compared to other competing architectures, as well as easier multi-channel sweeping and inherent sample-and-hold. This provides customers with a high-precision, versatile, single-chip DAS at an unequaled price," said Tony Chang, strategic marketing engineer for TI's data acquisition products.
Inside the ADS7871
The PGA provides high-input impedance, excellent gain accuracy, good common-mode rejection and low noise. For many low-level signals, no external amplification or impedance buffering is needed between the signal source and the ADC input. The offset voltage of the PGA is auto zeroed, offering excellent long term DC stability. Gains of 1, 2, 4, 5, 8, 10, 16 and 20V/V allow signals as low as 125mV to produce full-scale digital outputs. Power consumption is 8.5mW in normal operation and only 5uW in standby mode.
The ADS7871 contains an internal reference, which is trimmed for high initial accuracy and stability versus temperature. Drift is typically 10ppm/degrees Celsius. An internal reference buffer amplifier is provided for use with either an internal or external reference. An external reference can be used in situations, for example, where multiple ADS7871 devices share a common reference.The device includes a 4-bit digital I/O addressed through the serial interface, offering additional versatility for control of external multiplexers or other ancillary functions. The serial interface provides low-cost isolation and allows the use of SPITM, QSPITM, MicrowireTM and 8051-family protocols, without glue logic.
The ADS7871 is packaged in a SSOP-28, and is available now from TI and its authorized distributors. Suggested resale pricing is $4.75 in 1,000 piece quantities. The ADS7871 is pin compatible with TI´s ADS7870 12-bit data acquisition system.
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