AD7797BRUZ

AD7797 is a complete, analog front end for high precision, bridge sensor applications such as weigh scales. The AD7797 contain a Σ-∆ ADC capable of 24bit resolution, respectively. The on-chip instrumentation amplifier has a fixed gain of 128, allowing small amplitude signals such as those from bridge sensors to be directly interfaced to the ADC. Each device has one differential input and contains a temperature sensor that is internally connected to the ADC. This sensor can be used to perform temperature compensation of the bridge. The devices can be operated with the internal clock or an external clock. Typical application includes weigh scales, strain gauges, industrial process control instrumentation and portable instrumentation.

• RMS noise: 65nV
• Instrumentation amp
• Temperature sensor
• Internal clock oscillator and independent interface power supply
• Simultaneous 50Hz/60Hz rejection
• Update rate range: 4.17Hz to 123Hz
• Current: 250µA typ, power-down: 1µA and power supply range: 2.7V to 5.25V
• 3-wire serial SPI™, QSPI™, MICROWIRE™, DSP-compatible and schmitt trigger on SCLK
• 16 lead TSSOP package
• Operating temperature range from -40 to 105°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party