Precision Weigh Scale Design Using the AD7191 24-Bit Sigma-Delta ADC with Internal PGA (CN0118)This circuit is a weigh scale system that uses the AD7191. The AD7191 is a pin programmable, low noise, low drift, 24-bit Σ-Δ converter that includes a PGA and uses an internal clock. Therefore, the device simplifies the weigh scale design because most of the system building blocks are included on chip. The device has four output data rates and four gain settings that are selected using dedicated pins. This simplifies the interface to the ADC.
- Pin programmable gain amplifier
- Simplifies software writes from the processor
- 24-bit pressure application circuit
- Integrated PGA allows for wide array of sensors
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