Texas Instruments has a single-supply, auto-zero bridge sensor amplifier which features programmable gain and offset.

The PGA308 amplifies the sensor signal and provides digital calibration for zero (offset) and span (gain). A One-Wire, UART-compatible digital serial interface performs the calibration.

Intended for resistive bridge sensor conditioning and general data acquisition applications, the heart of the design is a precision, low-drift and low-noise front-end programmable gain amplifier (PGA).

Digital-programmable coarse offset, fine offset and selected gain (coarse and fine) may be controlled in real time or permanently programmed into the PGA308. The device can store seven banks of one-time programmable (OTP) memory of gain and offset calibration parameters. A separate power-on reset (POR) OTP bank can be programmed up to four times.

The fault monitor detects overload, burnout and system faults. The over-/under-scale limits offer additional system-level diagnostics.

Using auto-zero techniques, the device achieves excellent precision and noise over the extended industrial temperature range of -40 to +125ºC and has an operating voltage of +2.7V to +5.5V.

More information: www.ti.com