Digitally programmable analog signal conditioner just right for pressure bridge sensors

Tucson, AZ. (Jan. 23, 2004) — Texas Instruments Incorporated (TI) introduced a digitally programmable analog signal conditioner from the company's Burr-Brown product line, designed for pressure bridge sensors. This highly integrated, voltage-output integrated circuit (IC) provides amplification, digital calibration and error compensation that enables system performance approaching the inherent sensor repeatability.

The PGA309 amplifies a low level bridge sensor signal and provides digital calibration for sensor zero, zero drift, span, span drift and linearity errors with applied pressure. The calibration is performed via a One-Wire or Two-Wire serial interface. Calibration parameters — up to 17 different temperature calibration points with linear interpolation — are stored in an external non-volatile memory (typically a low-cost, SOT23-5 EEPROM). This eliminates manual trimming and assures long-term stability.
The PGA309 consists of amplification signal path (low-noise, low-drift, auto-zero programmable gain instrumentation amplifier), offset and offset drift adjustment, span and span drift adjustment, integrated temperature sensor, voltage reference, bridge excitation and linearization, sensor fault detection, power-on reset and digital interface. The PGA309 features a wide operating temperature range (-40C to +125C), internal/external temperature sense select, over/under limit scaling, internal/external reference selection and +2.7V to +5.5V supply operation.

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The PGA309 is available now from TI and its authorized distributors. The device is packaged in a TSSOP-16 and is priced from $2.95 in 1,000 piece quantities (suggested resale price). The evaluation module is also available.

Texas Instruments Incorporated Semiconductor Group, SC-04024 Literature Response Center P.O. Box 954 Santa Clara, CA 91380. Tel: 800-477-8924

PGA309 Data Sheet

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