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Application Note 9827
Connect the clock source to the eval board, also preferably
through the VME connector (or using the clock SMAs; see the
‘Clock Inputs’ section for more information). Failure to make
clean and short connections to the data input lines and clock
source will result in a decrease in spectral performance.
Using a coaxial cable with the proper SMA connector, attach
the output of one of the transformers, IOUT or QOUT, to the
measurement equipment that will be evaluating the
converter’s performance. Make sure that the jumpers are in
their proper placement. Consult the ‘Voltage Reference’
section and the ‘Sleep’ section of this document for a
de?nition of the jumpers’ functionality.
Learning Your Way Around
Direct Digital Synthesis
To ensure that everything on the board is con?gured
properly and functional, it is suggested that the following
DDS setup be implemented. The board test requires:
1. HI5728 Evaluation Board.
2. Spectrum Analyzer.
3. HSP-EVAL Board with the HSP45116 NCOM Daughter
Board Attached and included software, NCOMCTRL (or
a Data/Pattern Generator).
4. Personal Computer (IBM compatible) with a Parallel Port.
5. 50 ? SMA Cable.
6. Two +5V power supplies. One for the DAC Eval Board and
one for the HSP Eval Board.
Note: If the HSP-EVAL Board is to be used, it is highly
recommended that the user obtain the User’s Manual, the
data sheet for the HSP45116 NCOM, and the User’s Manual
for the HSP45116-DB. This platform is capable of testing the
converter up to 25MSPS, which is the speed of the HSP-
EVAL’s on-board clock. The user can choose to substitute
this clock with a slower one, but the DSP chip and DSP Eval
Board are only designed to work at a maximum of 25MHz (a
52MHz version of this DSP chip does exist but not in this
evaluation platform; see the HSP45116A). For testing of the
HI5728 at higher speeds, it is recommended that the user
3-4
obtain a high speed data generator capable of generating 10
bit patterns at the clock speed needed. The HSP45116
NCOM generates two, 16-bit channels of data.
HI5728EVAL1 is designed so that both of its input channels
mate with both of the DSP’s output channels. The zero ohm
resistors that connect the I and Q channels together on the
DAC eval board must be removed before using the
HSP45116 evaluation board. Also, the DSP Eval Board
cannot drive 50 ?.
HSP-EVAL Setup for DDS
Attach the HSP-EVAL and the HSP45116 Daughter Board
together; see ?gure 2. Consult their respective user manuals
for details. Connect the HI5728EVAL1 board to the P2
connector of the HSP-EVAL board. Then connect these to
an IBM compatible PC via the parallel port. Provide power to
both boards. To run the software (NCOMCTRL) that
accompanied the HSP evaluation kit, place the diskette into
the 3.5” drive of the PC and type:
(drive letter): NCOMCTRL,
which will run the HSP45116 Control Panel software. Set the
control panel’s selections to the following and check one of
the outputs of the DACs at either IOUT or QOUT using the
spectrum analyzer for a frequency equal to 1.63MHz.
The clock select of the control panel should be set to ‘Osc.
CLK’. The control signals should be as follows:
0 ENPHREG
0 CLROFR
1 LOAD
0 BINFMT
1 PMSEL
The amplitude of the real output (RIN0-15) should be
8000 HEX for full scale output. The center frequency register
can be set to 10ABCDEF HEX for a 1.63MHz tone. The
Offset Frequency, Phase Offset, and Time Accumulator
Registers should all be set to zeros. The spurious free
dynamic range that can be expected is typically 70dBc with
this setup operating at this frequency.
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