HI5628EVAL1 Intersil, HI5628EVAL1 Datasheet - Page 4

• Manufacturer Part Number: HI5628EVAL1
• Description: EVALUATION BOARD FOR LQFPHI5628
• Manufacturer: Intersil

Specifications of HI5628EVAL1

• Number Of Dac's: 2
• Number Of Bits: 8
• Outputs And Type: 2, Differential
• Sampling Rate (per Second): 125M
• Data Interface: Parallel
• Settling Time: 15ns
• Dac Type: Current
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: HI5628
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

64 or 96-pin connector will work. 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
definition of the jumpers’ functionality.
Learning Your Way Around
Direct Digital Synthesis
To ensure that everything on the board is configured properly
and functional, it is suggested that the following DDS setup
be implemented. The board test requires:
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
HI5628 at higher speeds, it is recommended that the user
obtain a high speed data generator capable of generating 8
bit patterns at the clock speed needed. The HSP45116
NCOM generates two, 16-bit channels of data.
HI5628EVAL1 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 50Ω.
HSP-EVAL Setup for DDS
Attach the HSP-EVAL and the HSP45116 Daughter Board
together; see figure 2. Consult their respective user manuals
for details. Connect the HI5628EVAL1 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
1. HI5628EVAL1 Evaluation Board.
2. Spectrum Analyzer.
3. HSP-EVAL Board with the HSP45116 NCOM Daughter
4. Personal Computer (IBM compatible) with a Parallel Port.
5. 50Ω SMA Cable.
6. Two +5V power supplies. One for the DAC Eval Board and
Board Attached and included software, NCOMCTRL.
one for the HSP Eval Board.
4
Application Note 9840
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
can be set to 10ABCDEF
Frequency, Phase Offset, and Time Accumulator Registers
should all be set to zeros. The spurious free dynamic range
that can be expected is typically 65dBc with this setup
operating at this frequency.
Comments
The HI5628EVAL1 evaluation board is prepared to evaluate
the HI5628, 8-bit Dual D/A Converter. It can be modified to
evaluate the HI5728, 10-bit Dual D/A Converter with the
inclusion of the series resistors that correspond to the 2
LSBs of each channel and the replacement of the HI5628
with the HI5728. The zero ohm resistors to ground on these
LSBs will also have to be removed. This allows for easier
implementation of future upgrades as the user will only have
to order new D/As and not an additional board. The HI5628
and HI5728 share similar pinouts and their respective
evaluation boards are identical with only minor changes to
the manner in which they are populated. If the user is
currently using the 8-bit device, has more bits available
digitally, and thinks they might upgrade in the future, it is
recommended that the HI5628 be implemented into their
system board with similar capabilities.
HEX
for full scale output. The center frequency register
HEX
for a 1.63MHz tone. The Offset