Output Driver Window; Eeprom Control - Analog Devices UG-182 User Manual

Evaluation Board User Guide

OUTPUT DRIVER WINDOW

Figure 23. Output Driver Window
The output driver window shown in Figure 23 is accessed by
clicking any of the triangular output driver symbols on the right
side of the main window (see Figure 24).
Figure 24. Output Drivers
It is important to power down unused outputs on the evaluation
board because they can be a major source of unwanted spurs.
The outputs are ac-coupled with 100 Ω differential resistors on
each output. This termination scheme is ideal for LVPECL
drivers. However, this scheme degrades the CMOS driver
performance. Improved CMOS driver performance is achieved
by removing the 100 Ω resistors.

EEPROM CONTROL

The EEPROM Control window shown in Figure 25 is accessed
by clicking the EEPROM button near the lower left quadrant of
the main window.
To store the current register settings of the AD9523-1 to the
EEPROM, click the Program EEPROM button. Visually
confirm the EEPROM Status Registers section on the right
side of the window to verify that the operation is successful.
To load the values stored in the EEPROM,
1. Disconnect the 6 V power connector to power down the
AD9523-1.
2. Ensure that the EEPROM pin is pulled high by placing the
P4 EEPROM_SEL jumper of the evaluation board across
the center and left (high) pin (see Figure 3).
3. Reconnect the 6 V power supply. This automatically loads
the EEPROM settings into the AD9523-1. The programmed
settings can be observed at the outputs. In addition, a
window opens (see Figure 26). Click the second option to
read from the AD9523-1. This loads the control software
with the current register settings that were programmed by
the EEPROM.
Figure 26. SYNC Evaluation Software Window
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Figure 25. EEPROM Control Window
UG-182