AD9877

FEATURES Low cost 3.3 V CMOS MxFE™ for MCNS-DOCSIS-, DVB-, DAVIC-compliant set-top box and cable modem applications 232 MHz quadrature digital upconverter 12-bit direct IF DAC (TxDAC+®) Up to 65 MHz carrier frequency DDS Programmable sampling clock rates Selectable interpolation filter Analog Tx output level adjust 12-bit, 33 MSPS direct IF ADC Dual 8-bit, 16.5 MSPS sampling IQ ADCs Two 12-bit Σ-Δ auxiliary DACs Direct interface to AD8321/AD8325 or AD8322/AD8327 PGA cable driver APPLICATIONS Cable modems Set-top boxes Wireless modems GENERAL DESCRIPTION The AD9877 is a single-supply set-top box and cable modem mixed-signal front end. The device contains a transmit path interpolation filter, complete quadrature digital upconverter, and transmit DAC. The receive path contains a 12-bit ADC and dual 8-bit ADCs. All internally required clocks and an output system clock are generated by the phase-locked loop (PLL) from a single crystal or clock input. The transmit path interpolation fil...