Part # AD7796 AD7797 datasheet

Part Manufacturer: Analog Devices

Analog Devices

Part Description: AD7796/AD7797 Low Power 16-/24-Bit Sigma-Delta ADC for Bridge Sensors Data Sheet (Rev. A)

Part Details:

Low Power, 16-/24-Bit Sigma-Delta ADC for Bridge Sensors AD7796/AD7797 FEATURES GENERAL DESCRIPTION RMS noise: 65 nV The AD7796/AD7797 are complete, analog front ends for high Instrumentation amp precision, bridge sensor applications such as weigh scales. The Temperature sensor AD7796/AD7797 contain a - ADC capable of 16-/24-bit Internal clock oscillator resolution, respectively. The on-chip instrumentation amplifier Simultaneous 50 Hz/60 Hz rejection has a fixed gain of 128, allowing small amplitude signals such as Update rate: 4.17 Hz to 123 Hz those from bridge sensors to be directly interfaced to the ADC. Current: 250 A typ Power-down: 1 A Each part has one differential input and contains a temperature Power supply: 2.7 V to 5.25 V sensor that is internally connected to the ADC. This sensor can ­40°C to +85°C temperature range be used to perform temperature compensation of the bridge. Independent interface power supply The devices can be operated with the internal clock or an 16-lead TSSOP external clock. The output data rate from the parts is software- programmable and can be varied from 4.17 Hz to 123 Hz. INTERFACE 3-wire serial The AD7796/AD7797 operate with a power supply from 2.7 V SPI®, QSPITM, MICROWIRETM, and DSP compatible to 5.25 V. Each part consumes a current of 250 A typical and is Schmitt trigger on SCLK housed in a 16-lead TSSOP. APPLICATIONS Weigh scales Strain gages Industrial process control Instrumentation Portable instrumentation FUNCTIONAL BLOCK DIAGRAM GND AVDD REFIN(+) REFIN(­) AD7796: 16-BIT ADC AVDD AD7797: 24-BIT ADC

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AD7796 AD7797.pdf Datasheet