AD6633

NOT RECOMMENDED FOR NEW DESIGNS

Multi-channel (Digital) Transmit Signal Processor (TSP) with VersaCREST™ Crest Reduction Engine

Data Sheet (Rev. Sp0) Product Selection Table

Viewing:

Overview

4 or 6 wideband digital upconverter channels
VersaCREST™ crest reduction engine reduces demands on external power amplifiers
One 20-bit complex input port (I/Q interleaved), shared among 4 or 6 processing channels
Two 18-bit output ports for parallel I and Q, or interleaved I and Q on a single port
All-pass phase equalizer filters (meets cdma2000 requirements)
Programmable RAM coefficient FIR filters (RCF) with resampling

FIR interpolating filters and Fifth-order interpolating CIC filter
Full complex NCO, 32-bit tuning resolution (fine), worst spur better than - 105 dBc
Complex FIR filter for frequency equalization
Power monitoring and output Automatic Gain Control
16-bit/8-bit MicroPort or SPI/SPORT compatible serial port
3.3 V I/O and 1.8 V core supplies

The AD6633 is a multi-channel, wide-bandwidth (Digital) Transmit Signal Processor (TSP) with VersaCREST^™ crest reduction engine. It processes digital baseband input data and generates wideband, real or complex output data. It drives Intermediate Frequency (IF) sampling Digital to Analog Converters (DACs) at sample rates up to 125 Mega Samples Per Second (MSPS). Up to six wideband modulated carriers per package can be achieved from a single output port. Devices may be connected together for additional channels by using multiple packages. Interpolation, anti-imaging filtering, all pass equalization, and NCO tuning functions are combined in a single, cost-effective device which includes the VersaCREST^™ crest factor reduction engine.

Each VersaCREST^™ wideband channel contains a peak-to-average compensation block that reduces Power Amplifier (PA) requirements. By minimizing infrequent peaks in Code-Division Multiple-Access (CDMA) signals, a PA with one-half to one-quarter the previously necessary power capacity can be used. This is done within standard signal quality requirements, and significantly lowers system cost.

VersaCREST is a trademark of Analog Devices Inc.

APPLICATIONS