AD7631 is a 18-bit, 250 kSPS, differential programmable input PulSAR® ADC from Analog Devices, supporting multiple input ranges and mode selections, with a 5 V internal reference, 102.5 dB dynamic range and 101 dB SNR, supporting parallel and serial interfaces, and packaged in a 48-lead LQFP and 48-lead LFCSP.
The AD7631 is an 18‑bit charge‑redistribution successive‑approximation register (SAR) analog‑to‑digital converter fabricated on Analog Devices' iCMOS high‑voltage process. It provides selectable input voltage ranges, a 250 kSPS maximum throughput, and a low‑power design with no pipeline delay. The device can be configured via hardware pins or a serial configuration port and supports both parallel and serial data interfaces.
The document includes full electrical specifications, timing diagrams, absolute maximum ratings, pin descriptions, and recommended PCB layout practices. It also lists the available 48‑lead LQFP and LFCSP package options and provides ordering information for the AD7631 family.
| Resolution | 18 bits |
|---|---|
| Maximum Throughput | 250 kSPS |
| Dynamic Range | 102.5 dB |
| Power Dissipation @ 250 kSPS (internal reference) | 94 mW |
| Power Dissipation @ 1 kSPS | 10 mW |
The AD7631 can sample up to 250 kSPS.
It supports +5 V (10 V p‑p), +10 V (20 V p‑p), +5 V (20 V p‑p), and +10 V (40 V p‑p) programmable differential input ranges.
Power dissipation is 10 mW at 1 kSPS.
The AD7631 is offered in a 48‑lead LQFP and a 48‑lead LFCSP (7 mm × 7 mm) package.