AD9868 is a low-cost 3.3V CMOS mixed-signal front end for broadband modems. It features a 10-bit DAC converter, 2x/4x interpolation filter, 200 MSPS DAC update rate, an integrated 17 dBm line driver with 19.5 dB gain control, a 10-bit, 80 MSPS, ADC converter, -12 dB to +48 dB low noise RxPGA (<3 nV/√Hz), a third-order programmable low-pass filter, a flexible digital data path interface, half- and full-duplex operation, pin compatibility with the AD9865, various power-down/reduction modes, an internal clock multiplier (PLL), and 2 auxiliary programmable clock outputs. It is suitable for broadband wireline networking.
The AD9868 mixed‑signal front‑end (MxFE) integrates a 10‑bit DAC, 2×/4× interpolation filter, 200 MSPS DAC update rate, a 17 dBm line driver, a 10‑bit ADC, low‑noise RxPGA, and programmable low‑pass filters. It supports half‑ and full‑duplex operation and offers flexible digital interfacing via an SPI port.
The device is supplied in a 64‑lead LFCSP package, operates over a commercial temperature range (‑40 °C to +85 °C), and includes power‑saving modes that allow individual functional blocks to be powered down when not in use. Detailed specifications cover analog and digital performance, power consumption, timing, and absolute maximum ratings.
| Supply Voltage (AVDD) | 3.3 V ±5% |
|---|---|
| DAC Update Rate | 200 MSPS |
| Operating Temperature Range | ‑40 °C to +85 °C |
All core supplies (AVDD, DVDD, CLKVDD, DRVDD) require 3.3 V, with AVDD allowed a ±5 % tolerance.