AD7720

PRODUCTION

CMOS Sigma-Delta Modulator with 90 dB Dynamic Range

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Overview

  • 12.5 MHz Master Clock Frequency
  • 0 V to +2.5 V or ±1.25 V Input Range
  • Single Bit Output Stream
  • 90 dB Dynamic Range
  • Power Supplies: AVDD, DVDD: +5 V ± 5%
  • On-Chip 2.5 V Voltage Reference
  • 28-Lead TSSOP

This device is a 7th order sigma-delta modulator that converts the analog input signal into a high speed 1-bit data stream. The part operates from a +5 V supply and accepts a differential input range of 0 V to +2.5 V or ±1.25 V centered about a common-mode bias. The analog input is continuously sampled by the analog modulator, eliminating the need for external sample and hold circuitry. The input information is contained in the output stream as a density of ones. The original information can be reconstructed with an appropriate digital filter.

AD7720
CMOS Sigma-Delta Modulator with 90 dB Dynamic Range
AD7720 Functional Block Diagram
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Tools & Simulations

Sigma-Delta ADC Tutorial

An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.

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