The AD6649 is a diversity receiver with high SNR, high SFDR, and low noise density. It features a dual-channel ADC and wideband digital processor, supporting high sample rates and IF sampling frequencies.
The AD6649 from Analog Devices is a mixed‑signal intermediate‑frequency receiver that combines dual 14‑bit, 250 MSPS ADCs with a wideband digital down‑converter, 32‑bit complex NCO and programmable FIR filter. It targets communications applications such as diversity radio, 3G/4G receivers and software‑defined radios.
The device operates from 1.8 V supplies, offers flexible power‑down modes, LVDS data outputs, and a 3‑pin SPI interface for configuration. Detailed specifications, pin descriptions, and design guidelines are provided for PCB layout and thermal management.
| Resolution | 14 Bits |
|---|---|
| Maximum Sample Rate | 250 MSPS |
| Signal‑to‑Noise Ratio (SNR) | 73.4 dBFS (95 MHz bandwidth) |
| Power Consumption (full operation) | 1 W |
| Supply Voltage | 1.8 V (AVDD and DRVDD) |
| Input Span | 1.75 V p‑p full‑scale |
| Input Capacitance | 25 pF |
| Input Resistance | 20 kΩ |
| Crosstalk | 95 dB |
The AD6649 can sample at up to 250 MSPS.
Both AVDD and DRVDD are 1.8 V supplies.
The device provides two LVDS data and OR outputs.
Use two separate 1.8 V supplies: one for analog (AVDD) and one for digital outputs (DRVDD).