Evaluation Board Overview; Evaluation Board Operation - Analog Devices AD9776A Manual

EVALUATION BOARD OVERVIEW

EVALUATION BOARD OPERATION

The AD9776A/AD9778A/AD9779A evaluation board is provided
to help users quickly become familiar with the operation of the
device and to evaluate the device performance. To operate the
evaluation board, the user needs a PC, a 5 V power supply, a
clock source, and a digital data source. The user also needs a
spectrum analyzer or an oscilloscope to observe the DAC output.
CLOCK
GENERATOR
ADAPTER
CABLES
CLKIN
DIGITAL
PATTERN
GENERATOR
CLOCK IN
DATACLK OUT
Figure 100. Typical Test Setup
DVDD18
P4 DIGITAL INPUT CONNECTOR
S7 DCLKOUT
Figure 101. AD9776A/AD9778A/AD9779A Evaluation Board Showing All Connections
The typical evaluation setup is shown in Figure 100. A sine or
square wave clock can be used to source the DAC sample clock.
The spectral purity of the clock directly affects the device per-
formance. A low noise, low jitter clock source is required.
All necessary connections to the evaluation board are shown in
more detail in Figure 101.
SPI PORT
SPECTRUM
AD9776A/
ANALYZER
AD9778A/
AD9779A
EVALUATION
BOARD
1.8V POWER SUPPLY
3.3V POWER SUPPLY
DVDD33 CVDD18 AVDD33
5V SUPPLY
MODULATOR
J1 CLOCK IN
JP4
S5 OUTPUT 1
JP15
JP8
JP14
AD9779A ADL537x
JP3
JP16
JP2
S6 OUTPUT 2
JP17
LOCAL OSC
SPI PORT
Rev. B | Page 53 of 56
AD9776A/AD9778A/AD9779A
J2
OUTPUT
+5V
GND
INPUT
ANALOG
DEVICES
AD9776A/
AD9778A/
AD9779A