This document describes the features and characteristics of the AD7720 CMOS Sigma-Delta Modulator, including 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, etc.
The AD7720 is a 7th‑order sigma‑delta modulator that converts an analog input into a high‑speed 1‑bit data stream. It operates from a +5 V supply and supports both unipolar (0 V to +2.5 V) and bipolar (±1.25 V) input ranges. The device includes an on‑chip 2.5 V reference and is offered in a 28‑lead TSSOP package.
The datasheet lists static and dynamic performance parameters, pin descriptions, timing characteristics, absolute maximum ratings, and typical characteristic curves. Key specifications include 16‑bit resolution, 90 dB dynamic range, and a master clock frequency of 12.5 MHz (up to 15 MHz for specified operation).
| Master Clock Frequency | 12.5 MHz (typical), 15 MHz max |
|---|---|
| Input Voltage Range | 0 V to +2.5 V (unipolar) or ±1.25 V (bipolar) |
| Dynamic Range | 90 dB |
| Resolution | 16 Bits |
| Differential Nonlinearity | +1 LSB max |
| Integral Nonlinearity | +2 LSB typ |
| Power Supply | AVDD, DVDD: +5 V ±5 % |
| Package | 28‑Lead TSSOP |
It supports a unipolar range of 0 V to +2.5 V and a bipolar range of ±1.25 V.
The device is offered in a 28‑lead TSSOP package.