AD7631 is a 18-bit, 250 kSPS, differential programmable input PulSAR® ADC with multiple input ranges, 250 kSPS throughput, 18-bit resolution with no missing codes, 102.5 dB dynamic range, 101 dB SNR, -112 dB THD, iCMOS® process, 5 V internal reference, 5 V/3.3 V interface, SPI/QSPI™/MICROWIRE™/DSP compatible, Pb-free, 48-lead LQFP and 48-lead LFCSP (7 mm × 7 mm) package, suitable for process controls, high speed data acquisition, digital signal processing and other applications.
The AD7631 from Analog Devices is an 18‑bit successive‑approximation register (SAR) analog‑to‑digital converter. It offers four programmable input voltage ranges, a maximum throughput of 250 kSPS, and operates from –40 °C to +85 °C.
The datasheet provides detailed specifications, timing diagrams, pin configurations, absolute maximum ratings, and layout guidelines for designing PCB implementations. It also includes ordering information for the LQFP and LFCSP package options.
| Resolution | 18 bits |
|---|---|
| Throughput | 250 kSPS |
| Power Dissipation (250 kSPS) | 73 mW |
| Dynamic Range | 102.5 dB |
| Signal‑to‑Noise Ratio | 101 dB @ 2 kHz |
The AD7631 provides four programmable input ranges: +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).
The device is specified to operate from –40 °C to +85 °C.
AVDD and DVDD are 5 V (±5 %), OVDD is 2.7 V to 5.5 V, VCC is 15 V, and VEE is –15 V.