PGA308-DIE
www.ti.com SBOS624 – JUNE 2012 SINGLE-SUPPLY, AUTO-ZERO SENSOR AMPLIFIER
WITH PROGRAMMABLE GAIN AND OFFSET
Check for Samples: PGA308-DIE FEATURES 1 Digital Calibration for Bridge Sensors
Offset Select: Coarse and Fine
Gain Select: Coarse and Fine
Bridge Fault Monitor
Input Mux for Lead Swap
Over/Under Scale Limits
DOUT/ VOUT Clamp Function
Seven Banks OTP Memory One-Wire Digital UART Interface
Operating Voltage: 2.7 V to 5.5 V APPLICATIONS Bridge Sensors
Remote Transmitters
Strain, Load, Weigh Scales
Automotive Sensors DESCRIPTION
The PGA308 is a programmable analog sensor signal conditioner. The analog signal path amplifies the sensor
signal and provides digital calibration for offset and gain. Calibration is done via the 1W pin, a digital One-Wire,
UART-compatible interface. For three-terminal sensor modules, 1W may be connected to VOUT and the assembly
programmed through the VOUT pin. Gain and offset calibration parameters are stored onboard in seven banks of
one-time programmable (OTP) memory. The power-on reset (POR) OTP bank may be programmed a total of
four times.
The all-analog signal path contains a 2Г—2 input multiplexer (mux) to allow electronic sensor lead swapping, a
coarse offset adjust, an auto-zero programmable gain instrumentation amplifier (PGA), a fine gain adjust, a fine …
