The AD7716 is a 4‑channel 22‑bit A/D converter designed for low‑frequency, high‑dynamic‑range measurements such as ECG, EEG, and other biomedical or process‑control signals. It features on‑chip digital filtering with selectable cutoff frequencies of 584 Hz down to 36.5 Hz and provides a usable dynamic range up to 105 dB.
The device is supplied in 44‑pin PQFP or PLCC packages, operates from ±5 V supplies, and includes a serial interface with pins for address, cascade, and data control. Typical applications include biomedical data acquisition, high‑accuracy instrumentation, and seismic systems.
| Resolution | 22 Bits |
|---|---|
| Dynamic Range | 105 dB (146 Hz input) |
| Filter Cutoff Frequencies | 584 Hz, 292 Hz, 146 Hz, 73 Hz, 36.5 Hz |
| Analog Input Range | ±2.5 V |
| Power Consumption | 50 mW max |
| Supply Voltage (AVDD) | +5 V nominal |
| Package Options | 44‑pin PQFP, 44‑pin PLCC |
The AD7716 provides four independent A/D converter channels.
With a master clock of 8 MHz, the AD7716 samples at 570 kHz (fCLKIN/14).
The digital filter can be set to 584 Hz, 292 Hz, 146 Hz, 73 Hz, or 36.5 Hz.
It is offered in 44‑pin PQFP and 44‑pin PLCC packages.