HSP50214BVI中文資料Intersil數(shù)據(jù)手冊(cè)PDF規(guī)格書

The HSP50214B Programmable Downconverter converts

digitized IF data into filtered baseband data which can be

processed by a standard DSP microprocessor. The

Programmable Downconverter (PDC) performs down

conversion, decimation, narrowband low pass filtering, gain

scaling, resampling, and Cartesian to Polar coordinate

conversion.

The 14-bit sampled IF input is down converted to baseband

by digital mixers and a quadrature NCO, as shown in the

Block Diagram. A decimating (4 to 32) fifth order Cascaded

Integrator-Comb (CIC) filter can be applied to the data

before it is processed by up to 5 decimate-by-2 halfband

filters. The halfband filters are followed by a 255-tap

programmable FIR filter. The output data from the

programmable FIR filter is scaled by a digital AGC before

being re-sampled in a polyphase FIR filter. The output

section can provide seven types of data: Cartesian (I, Q),

polar (R, θ), filtered frequency (dθ/dt), Timing Error (TE), and

AGC level in either parallel or serial format.

Features

? Up to 65MSPS Front-End Processing Rates (CLKIN) and

55MHz Back-End Processing Rates (PROCCLK)

Clocks May Be Asynchronous

? Processing Capable of >100dB SFDR

? Up to 255-Tap Programmable FIR

? Overall Decimation Factor Ranging from 4 to 16384

? Output Samples Rates to ?12.94MSPS with Output

Bandwidths to ? 982kHz Lowpass

? 32-Bit Programmable NCO for Channel Selection and

Carrier Tracking

? Digital Resampling Filter for Symbol Tracking Loops and

Incommensurate Sample-to-Output Clock Ratios

? Digital AGC with Programmable Limits and Slew Rate to

Optimize Output Signal Resolution; Fixed or Auto Gain

Adjust

? Serial, Parallel, and FIFO 16-Bit Output Modes

? Cartesian to Polar Converter and Frequency Discriminator

for AFC Loops and Demodulation of AM, FM, FSK, and

DPSK

? Input Level Detector for External I.F. AGC Support

? Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

? Single Channel Digital Software Radio Receivers

? Base Station Rx’s: AMPS, NA TDMA, GSM, and CDMA

? Compatible with HSP50210 Digital Costas Loop for PSK

Reception

? Evaluation Platform Available