1FEATURES
• 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
• D OUT/ 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 2×2 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
offset adjust, and a programmable gain output amplifier. Fault monitor circuitry detects and signals sensor
burnout, overload, and system fault conditions. Over/under-scale limits provide additional means for system level
diagnostics. The dual-use DOUT/VCLAMP pin can be used as a programmable digital output or as a VOUT overvoltage
clamp.