The AD7661 is a 16-bit 100 kSPS PulSAR® unipolar ADC with a 2.5V internal reference, 100 kSPS throughput, and 16-bit resolution.
The AD7661 is a 16‑bit, 100 kSPS 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 both parallel and 2‑wire serial interfaces compatible with 3 V and 5 V logic levels.
The device is offered in 48‑lead LQFP and LFCSP packages, operates from –40 °C to +85 °C, and provides low power dissipation (16 mW typical without reference). Detailed specifications cover resolution, input range, timing, absolute maximum ratings, pin functions, and layout recommendations for optimal performance.
| Resolution | 16 bits |
|---|---|
| Maximum Throughput | 100 kSPS |
| Analog Input Voltage Range | 0 V to 2.5 V |
| Power Dissipation (typical, no REF) | 16 mW |
| Internal Reference Temperature Drift (typical) | 3 ppm/°C |
| Signal‑to‑Noise Ratio (SNR) | 88 dB min @ 20 kHz |
| Total Harmonic Distortion (THD) | -96 dB max @ 20 kHz |
| Supply Voltage | Single 5 V |
The AD7661 can convert at up to 100 kSPS.
It operates from a single 5 V supply.
The internal reference drifts about 3 ppm per degree Celsius.
The AD7661 is offered in a 48‑lead LQFP and a 48‑lead LFCSP package.