This document describes a 16-bit 100 kSPS PulSAR® unipolar ADC with a 2.5V internal reference. It features a throughput of 100 kSPS, INL of ±2.5 LSB max, and a resolution of 16 bits. The ADC has both AC and DC specifications, no pipeline delay, and a parallel and serial 5V/3V interface. It is suitable for applications such as data acquisition, medical instruments, and digital signal processing.
The AD7661 is a 16‑bit charge‑redistribution SAR analog‑to‑digital converter that operates from a single 5 V supply. It includes an internal 2.5 V reference, error‑correction circuitry, and offers both parallel and 2‑wire serial interfaces compatible with 3 V and 5 V logic.
The device provides 100 kSPS throughput, ±2.5 LSB INL, 88 dB minimum SNR, and –96 dB maximum THD. It is available in 48‑lead LQFP and LFCSP packages and is rated for –40 °C to +85 °C operation. Typical applications include data acquisition, medical instruments, signal processing, and battery‑powered systems.
| Resolution | 16 Bits |
|---|---|
| Analog Input Voltage Range | 0 V to 2.5 V |
| Throughput | 100 kSPS |
| Internal Reference Temperature Drift | ±3 ppm/°C |
| Signal‑to‑Noise Ratio (SNR) | 88 dB min @ 20 kHz |
| Total Harmonic Distortion (THD) | –96 dB max @ 20 kHz |
| Integral Nonlinearity (INL) | ±2.5 LSB max |
The AD7661 operates from a single 5 V supply.
It supports both parallel and 2‑wire serial interfaces that are compatible with 3 V and 5 V logic.
The analog input voltage range is 0 V to 2.5 V.