1 Features

• Analog features:

– Analog front-end for resistive bridge sensors

– Accommodates sensor sensitivities from 1mV/V

to 135mV/V

– On-chip temperature sensor

– Programmable gain

– 24-bit sigma-delta analog-to-digital converter

for signal channel

– 24-bit sigma-delta analog-to-digital converter

for temperature channel

– 14-bit output DAC

• Digital features:

– FSO accuracy across temperature: < 0.1%

– System response time: < 220μs

– Third-order offset, gain, and nonlinearity

temperature compensation

– Diagnostic functions

– Integrated EEPROM for device operation,

calibration data and user data

• Peripheral features:

– I2C interface for data reading and device

configuration

– One-wire interface enables communication

through the power supply pin without using

additional lines

– Current loop interface: 4mA to 20mA

– Ratiometric and absolute voltage output

– Power management control

– Analog low-voltage detect

• General features:

– Industrial temperature range: –40°C to 150°C

– Power supply:

• On-chip power management accepts wide

power-supply voltage from 3.3V to 30V

• Integrated reverse-protection circuit

2 Applications

• Pressure-sensor transmitters and transducers

• Liquid-level meter, flow meters

• Resistive field transmitters

3 Description

The PGA305 device supplies an interface for

piezoresistive and strain-gauge pressure-sense

elements. The device is a full system-on-chip (SoC)

solution that includes programmable analog front end

(AFE), ADC, and digital signal processing that enable

direct connection to the sense element. The PGA305

device also includes integrated voltage regulators

and an oscillator to minimize the number of external

components. The PGA305 device can employ thirdorder

temperature and nonlinearity compensation to

achieve high accuracy. The device can also use the

integrated I2C interface or the one-wire serial interface

(OWI) to achieve external communication and simplify

the system calibration process. An Integrated DAC

supports absolute-voltage, ratiometric-voltage, and

4mA to 20mA current-loop outputs.