AD7724 is a dual CMOS Σ-Δ modulator manufactured by Analog Devices. The device consists of two seventh order sigma-delta modulators. Each modulator converts its analog input signal into a high speed 1-bit data stream. The part operates from a 5 V power 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 inputs are continuously sampled by the analog modulators, eliminating the need for external sample-and-hold circuitry. The output data stream rate is 13 MHz with 90 dB of dynamic range. AD7724 is a 48-lead LQFP package that supports 3 V to 5 V power supply voltages.
The AD7724 is a dual seventh‑order sigma‑delta modulator that converts analog inputs to a high‑speed 1‑bit data stream. It operates from a 5 V supply, supports both unipolar (0 V to VREF) and bipolar (±VREF/2) input ranges, and includes an on‑chip 2.5 V reference.
The document provides detailed electrical specifications, timing characteristics, pin configurations, and recommended circuit layouts. It also includes performance graphs for signal‑to‑noise ratio, total harmonic distortion, and spurious‑free dynamic range across temperature and frequency ranges.
| Master Clock Frequency | 13 MHz |
|---|---|
| Dynamic Range | 90 dB |
| Power Supply | AVDD/DVDD 5 V ±5% |
| Package | 48‑Lead LQFP |
| Operating Temperature Range | –40 °C to +85 °C |
| Bipolar Input Range | ±VREF2/2 V |
| Unipolar Input Range | 0 to VREF2 V |
| Reference Voltage | 2.5 V on‑chip |
The device is specified for a master clock frequency of 13 MHz.
In bipolar mode the input range is ±VREF2/2 volts.
The AD7724 can operate up to +85 °C.
It is offered in a 48‑lead plastic thin‑quad flat‑pack (LQFP).