This document describes the features and characteristics of the 18-bit, 1.25 MSPS PulSAR® ADC AD7643, including input range, resolution, dynamic range, signal-to-noise ratio, total harmonic distortion, etc.
The AD7643 PulSAR® ADC provides 18‑bit resolution, 1.25 MSPS throughput, and a dynamic range of 95 dB. It operates from a single 2.5 V supply and includes an internal 2.048 V reference with ±8 ppm/°C drift.
The device offers both parallel (18‑, 16‑, or 8‑bit) and serial (SPI/QSPI/MICROWIRE/DSP) interfaces, making it suitable for medical instruments, high‑speed data acquisition, DSP, spectrum analysis, instrumentation, and communications applications.
| Resolution | 18 Bits |
|---|---|
| Throughput | 1.25 MSPS |
| Power Dissipation (internal reference) | 65 mW typical @ 1.25 MSPS |
| Internal Reference Voltage | 2.048 V (typical) |
| Dynamic Range | 95 dB typical |
| Supply Voltage | 2.5 V single supply |
| Operating Temperature Range | -40 °C to +85 °C |
The AD7643 can sample at up to 1.25 MSPS.
It operates from a single 2.5 V supply.
Yes, it includes a 2.048 V internal reference with typical drift of ±8 ppm/°C.
The differential input range is ±VREF, with VREF up to 2.5 V.