AD9776A Analog Devices, AD9776A Datasheet - Page 53

• Manufacturer Part Number: AD9776A
• Description: Dual 12-Bit, 1 GSPS, Digital-to-Analog Converter
• Manufacturer: Analog Devices

Specifications of AD9776A

• Resolution (bits): 12bit
• Dac Update Rate: 1GSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: Par

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 IN
Figure 101. AD9776A/AD9778A/AD9779A Evaluation Board Showing All Connections
GENERATOR
PATTERN
DIGITAL
P4 DIGITAL INPUT CONNECTOR
DATACLK OUT
ADAPTER
CABLES
S7 DCLKOUT
GENERATOR
DVDD18
CLOCK
Figure 100. Typical Test Setup
CLKIN
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AD9779A
EVALUATION
AD9776A/
AD9778A/
AD9779A
SPI PORT
DVDD33
BOARD
SPI PORT
J1 CLOCK IN
JP15
JP14
JP16
JP17
JP4
JP8
JP3
JP2
CVDD18
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.
S5 OUTPUT 1
S6 OUTPUT 2
AVDD33
ADL537x
1.8V POWER SUPPLY
3.3V POWER SUPPLY
MODULATOR
SPECTRUM
LOCAL OSC
ANALYZER
5V SUPPLY
ANALOG
AD9776A/
AD9778A/
OUTPUT
DEVICES
AD9779A
INPUT
J2
AD9776A/AD9778A/AD9779A
+5V
GND