Overview

Description

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)

Comparison

Applications

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

Documentation

Type Title Date
Datasheet PDF 4.40 MB
End Of Life Notice PDF 1.17 MB
End Of Life Notice PDF 292 KB
Other PDF 204 KB
Application Note PDF 375 KB
Application Note PDF 942 KB
6 items

Design & Development

Models