DATASHEET
ISL5216 FN6013
Rev.3.00
July 13, 2007 Four-Channel Programmable Digital Downconverter
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 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 are filtered with a 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 …