The AD6635 is a multimode, 8-channel, digital Receive Signal
Processor (RSP) capable of processing up to four WCDMA
channels. Each channel consists of four cascaded signal-processing
elements: a frequency translator, two CIC decimating filters,
and a programmable coefficient-decimating filter. Each input
port has input level threshold detection circuitry for accommodating
large dynamic ranges or situations where gain ranging
converters are used. Quad 16-bit parallel output ports accommodate
high data rate WBCDMA applications. On-chip
interpolating half-band filters can also be used to further
increase the output rate. In addition, each output port has a
digital AGC for accommodating large dynamic ranges using
smaller bit widths. The AGCs can maintain either signal level or
clipping level, depending on their mode. Link port outputs are
provided to enable glueless interfaces to Analog Devices’
TigerSHARC DSP core.