DATASHEET
ISL5217 FN6004
Rev. 3.00
July 8, 2005 Quad Programmable Up Converter
The ISL5217 Quad Programmable UpConverter (QPUC) is a
QASK/FM modulator/FDM upconverter designed for high
dynamic range applications such as cellular basestations. The
QPUC combines shaping and interpolation filters, a complex
modulator, and timing and carrier NCOs into a single package.
Each QPUC can create four FDM channels. Multiple QPUCs can
be cascaded digitally to provide for up to 16 FDM channels in
multi-channel applications.
The ISL5217 supports both vector and FM modulation. In vector
modulation mode, the QPUC accepts 16-bit I and Q samples to
generate virtually any quadrature AM or PM modulation format.
The QPUC also has two FM modulation modes. In the FM with
pulse shaping mode, the 16-bit frequency samples are pulse
shaped/bandlimited prior to FM modulation. No band limiting filter
follows the FM modulator. This FM mode is useful for GMSK
type modulation formats. In the FM with band limiting filter mode,
the 16-bit frequency samples directly drive the FM modulator.
The FM modulator output is filtered to limit the spectral
occupancy. This FM mode is useful for analog FM or FSK …