HI5731-EVS Intersil, HI5731-EVS Datasheet - Page 7

• Manufacturer Part Number: HI5731-EVS
• Description: EVALUATION PLATFORM SOIC HI5731
• Manufacturer: Intersil

Specifications of HI5731-EVS

• Number Of Dac's: 1
• Number Of Bits: 12
• Outputs And Type: 1, Differential
• Sampling Rate (per Second): 100M
• Data Interface: Parallel
• Settling Time: 20ns
• Dac Type: Current
• Voltage Supply Source: Analog and Digital, Dual ±
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: HI5731
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Using the HSP-EVAL Test Platform
The HSP-EVAL DDS platform allows quick testing of spectral
properties of a given DAC. The Numerically Controlled
Oscillator/Modulator (NCOM) generates digital sinewave
patterns that are loaded into the DAC. The analog output of
the DAC is the reconstructed sinewave pattern. The program
NCOMCTRL allows downloading of the desired center
frequency. The clock or sampling frequency is 25MHz. To
determine the center frequency codeword the following
formula is used:
PERSONAL COMPUTER
SOFTWARE
INCLUDED
CIRCUIT
CLOCK
FIGURE 16. INTERSIL HI5731/DDS EVALUATION SYSTEM SETUP BLOCK DIAGRAM
3-7
NCOM EVALUATION BOARD
HSP-EVAL/HPS45116
PC INTERFACE
NUMERICALLY
CONTROLLED
OSCILLATOR
HSP45116
Application Note 9602
Center Frequency
This 32-bit hexadecimal word will create the fundamental. In
order to ensure zero phase offset the cursor should be
moved to the LOAD select. Pressing the spacebar the value
should be toggled from 1 to 0 and back to 1 again. This will
ensure that any previous values in the phase register are
cleared and the sinewave pattern is started at zero phase.
The HSP-EVAL setup is powered from the DAC module
power-supply banana jacks. The output of the setup can be
observed on an oscilloscope or a spectrum analyzer.
+5V
DAC MODULE
SUPPLY
POWER
HI5731
HI5731
DAC
HEX
-
= (Desired Frequency/25MHz) x 2
5.2V
SPECTRUM ANALYZER
CABLE
50
SMA
32