The AD7634 is a 18-bit, 670 kSPS, differential programmable input PulSAR® ADC.
The AD7634 is an 18‑bit charge‑redistribution successive approximation register (SAR) analog‑to‑digital converter fabricated in Analog Devices' iCMOS high‑voltage process. It provides multiple programmable input ranges (5 V to 10 V, +10 V to 40 V) and three sampling modes (warp, normal, impulse) with throughputs of 670 kSPS, 570 kSPS, and 450 kSPS respectively.
The device includes internal reference and buffer, parallel and serial interfaces, and a range of protection features. Detailed pin configurations, timing specifications, absolute maximum ratings, and layout guidelines are provided to aid PCB design and system integration.
| Resolution | 18 Bits |
|---|---|
| Power Dissipation (Warp mode) | 180 mW |
| Dynamic Range | 102.5 dB |
| Signal‑to‑Noise Ratio (2 kHz input) | 101 dB |
| Input Voltage Range (±10 V) | 40 V p‑p |
| Operating Temperature Range | -40 °C to +85 °C |
At 670 kSPS (warp mode) the device dissipates about 180 mW.
Four programmable ranges are provided: 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).
Analog and digital ground planes should be kept separate and joined at a single point close to the AD7634.