|Package | PIN:||PW | 16|
|Temp:||S (-40 to 150)|
- Analog Features
- Dual ChannelAnalog Front-End
- On-Chip Temperature Sensor
- ProgrammableGain up to 200 V/V
- 16-BitSigma-Delta Analog-to-Digital Converter
- Digital Features
- 3rd-Order LinearityCompensation Algorithm
- EEPROM Memory for DeviceConfiguration, Calibration Data, and User Data
- One-Wire Interface Through PowerLine
- General Features
- AFESensor Input, Power Supply, and Output Buffer Diagnostics
- Memory Built-InSelf-Test (MBIST)
- Power ManagementControl
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Texas Instruments PGA302EPWR
The PGA302 is a low-drift, low-noise,programmable signal-conditioner device designed for a variety of resistive bridge-sensingapplications like pressure-, temperature-, and level-sensing applications. The PGA302 can alsosupport flow metering applications, weight scale and force-sensing applications that use straingauge load cells, and other general resistive bridge signal-conditioning applications.
The PGA302 provides a bridge excitationvoltage of 2.5 V and a current output source with programmable current output up to 1 mA. At theinput, the device contains two identical analog front-end (AFE) channels followed by a 16-bitSigma-Delta ADC. Each AFE channel has a dedicated programmable gain amplifier with gain up to 200V/V.
In addition, one of the channels integrates a sensor offsetcompensation function while the other channel integrates an internal temperature sensor.
At the output of the device, a 1.25-V, 14-bit DAC is followed by aratiometric-voltage supply output buffer with gain of 4 V/V allowing a 0-5V ratiometric voltagesystem output. The PGA302 device implements a third-order temperaturecoefficient (TC) and non-linearity (NL) digital compensation algorithm to calibrate the analogoutput signal. All required parameters for the linearization algorithm as well as other user datais stored in the integrated EEPROM memory.
For system connectivity the PGA302 deviceintegrates an I2C Interface as well as a one-wire interface (OWI) thatsupports communication and configuration through the power-supply line during final systemcalibration process. Diagnostics are implemented at the excitation output sources, the input to theAFE and the power supplies in the device. System Diagnostics like sensor open / short are alsosupported.
PGA302 accommodates various sensing elementtypes, such as piezoresistive, ceramic film, strain gauge, and steel membrane. The device can alsobe used in accelerometer, humidity sensor signal-conditioning applications, as well as in somecurrent-sensing, shunt-based applications.