The ISL5216 Quad Programmable Digital Downconverter (QPDC) is designed for high dynamic range applications such as cellular basestations where multiple channel processing is required in a small physical space. The QPDC combines into a single package a set of four channels which include: digital mixers, a quadrature carrier NCO, digital filters, a resampling filter, a cartesian to polar coordinate converter, and an automatic gain control (AGC) loop. The ISL5216 accepts four channels of 16-bit fixed or up to 14-bit mantissa/3-bit exponent floating point real or complex digitized IF samples which are mixed with local quadrature sinusoids. Each channel carrier NCO frequency is set independently by the microprocessor. The output of the mixers is filtered with CIC and FIR filters, with a variety of decimation options. Gain adjustment is provided on the filtered signal. The digital AGC provides a gain adjust range of up to 96dB with programmable thresholds and slew rates. A cartesian to polar coordinate converter provides magnitude and phase outputs. A frequency discriminator is also provided to allow FM demodulation. Selectable outputs include I samples, Q samples, magnitude, phase, frequency, and AGC gain. The output resolution is selectable from a 4-bit fixed point to a 32-bit floating point. Output bandwidths in excess of 1MHz are achievable using a single channel. Wider bandwidths are available by cascading or polyphasing multiple channels.


  • Up to 95MSPS input
  • Four independently programmable downconverter channels in a single package
  • Four parallel 17-bit inputs providing 16-bit fixed or one of several 17-bit floating point formats
  • 32-bit programmable carrier NCO with >115dB SFDR
  • 110dB FIR out of band attenuation
  • Decimation from 4 to >65536
  • 24-bit internal data path
  • Digital AGC with up to 96dB of gain range
  • Filter functions
    • 1- to 5-stage CIC filter
    • Halfband decimation and interpolation FIR filtering
    • Programmable FIR filtering
    • Resampling FIR filtering
  • Cascadable filtering for additional bandwidth
  • Four independent serial outputs
  • 2.5V core, 3.3V I/O operation
  • Pb-free plus anneal available (RoHS compliant)


  • Narrow-band TDMA through IS-95 CDMA digital software radio and basestation receivers
  • Wide-band applications: W-CDMA and UMTS digital software radio and basestation receivers

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active FBGA Tray 189
Active FBGA Tray 126
Active FBGA Tray 126
Active FBGA Tray 189

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL5216 Datasheet Datasheet PDF 2.84 MB
Application Notes & White Papers
AN9928: Use of HSP50216 QPDC for CDMA applications. (IS95 and CDMA2000) Application Note PDF 427 KB
AN9927: Use of HSP50216 and ISL5216 QPDC in Wideband Applications-UMTS Application Note PDF 360 KB
AN9987: IEEE Standard Test Access Port and Boundary Scan Register for the ISL5216 (QPDC) Application Note PDF 541 KB
ISL5216 Evaluation Board Schematics Design File PDF 127 KB
ISL5216 Evaluation Board Software v1.2.1 Library EXE 4.42 MB
HSP50216, ISL5216, ISL5416 USB Interface Software Library ZIP 11.09 MB

Boards & Kits

Part Number Title Type Company
ISL5216EVAL1 Four-Channel Programmable Digital Downconverter Evaluation Board Evaluation Renesas