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Application Note 9855
The timing between the clock and the data will effect spectral
performance and functionality. Minimum setup and hold times
are specified in the datasheet to represent the point at which
the DAC begins to lose bits. Optimal setup and hold times
vary with the clock rate to output frequency ratio. A general
rule is that the lower the F CLK /F OUT ratio is, the higher the
setup time should be to achieve optimum spectral behavior.
Getting Started
A summary of the external supplies, equipment, and signal
sources needed to operate the board is given below:
1. +5V to +3V supply for HI5x60 DAC.
2. Pattern Generator.
3. Square wave clock source (usually part of the Pattern
Generator).
4. Spectrum Analyzer or Oscilloscope for viewing the output
of the converter.
HP-SMA TEST BOARD
( INTERSIL MADE)
16 BITS AVAILABLE
Attach the evaluation board to the power supply(s). Connect
the bits from the data generator to the evaluation board,
preferably by using a male, 64 or 96-pin VME (Versa Module
Eurocard) connector that mates with the evaluation board.
Connect the clock source to the evaluation board, also
preferably through the VME connector. 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 the converter, I OUT , 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.
HI5828 EVALUATION BOARD
UP TO
14 BITS
1/2 HI5828
DUAL DAC
CLOCK
1/2 HI5828
DUAL DAC
CLK
CLK
UP TO
14 BITS
+5V TO +3V
POWER
50 ?
SMA
CABLE
SUPPLY
HEWLETT PACKARD HP80000
PATTERN GENERATOR
SPECTRUM ANALYZER
FIGURE 2. INTERSIL HI5828 EVALUATION SYSTEM SETUP BLOCK DIAGRAM
3-3
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