AD7720 CMOS Sigma-Delta Modulator with 90 dB Dynamic Range

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.

Features and Benefits

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

Analog to Digital Converters

A/D Converters

Data Sheets

Document	note
AD7720: CMOS Sigma-Delta Modulator with 90 dB Dynamic Range Data Sheet (Rev. 0)	PDF 232 kB

Application Notes

Document	note
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)	PDF 76.97 K
AN-389: Using Sigma-Delta Converters-Part 2	PDF 590 kB
AN-388: Using Sigma-Delta Converters-Part 1	PDF 590 kB
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging	PDF 217 kB
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:	PDF 149 kB
AN-283: Sigma-Delta ADCs and DACs	PDF 1699 kB