GC5016 Datasheet, PDF (28/88 Pages) Texas Instruments – WIDEBAND QUAD DIGITAL DOWN CONVERTER/ UP CONVERTER

GC5016
SLWS142G − JANUARY 2003 − REVISED NOVEMBER 2005
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The frame strobes [A..D]FS are used to signify the beginning of a data frame for each port. The frame strobes are
set high by the GC5016 with the first word in a frame.
The GC5016 output can be a single data, interleaved complex data, or time division multiplexed data. The GC5016
may be configured to have one port for each channel. The GC5016 can be configured in time division multiplex data
mode to have all 4 channels’ data output on the D output port.
The number of pins used for a port is user programmable as 4, 8, or 16 . The number of bits in a word is user
programmable as 4, 8, 12, 16, or 20 . When the number of word bits is larger than the number of pins, the data is
sent time domain multiplexed at the divided port clock rate [A..D]CK. The most significant bits (MSBs) are sent first.
For complex data, I is followed by Q. The frame strobe is set high with the MSB of the first I word as shown in
Figure 14.
For example, in interleaved IQ mode, with16 bits (bits=16) and four pins (pins=4) selected, there are eight transfers
requiring at least 8 divided clocks, so (cic_int x fir_int/(sck_div+1) must be eight or greater. The keywords bits, pins,
sck_div, and routf_tdm are used to setup the output interface.
The GC5016 can round the output to any size from 4-bits to 20-bits and supplies zeros for the extra LSBs. The number
of bits after rounding can be smaller than the number of bits in a word.
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