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Применения > > Weigh Scale Design Using the AD7781 20-Bit Sigma-Delta ADC with Internal PGA

Weigh Scale Design Using the AD7781 20-Bit Sigma-Delta ADC with Internal PGA (CN0108)

This circuit is a weigh scale system that uses the AD7781. The AD7781 is a pin programmable, low power, low drift 20-bit Σ-Δ converter that includes a PGA and uses an internal clock. Therefore, the device simplifies the weigh scale design since most of the system building blocks are included on the chip. The device consumes only 330 μA typically and is, therefore, suitable for any low power or battery application. The AD7781 also has a power-down mode that allows the user to switch off the power to the bridge sensor and power down the AD7781 when not converting, thus increasing the battery life.


Figure 1. Weigh Scale System Using the AD7781 (Simplified Schematic: All Connections Not Shown)

Возможности

  • 20-bit Weigh scale application circuit
  • Integrated PGA allows for wide array of weigh scales
  • Low power and low cost
  • Typically used in portable weigh scale applications

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Weigh Scale Design Using the AD7781 20-Bit Sigma-Delta ADC with Internal PGA  CN0108

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