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ADCLK846 View Datasheet(PDF) - Analog Devices

Part Name
Description
Manufacturer
ADCLK846 Datasheet PDF : 3 Pages
1 2 3
Circuit Designs Using Analog Devices Products
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Circuit Note
CN-0121
Devices Connected/Referenced
AD9910
1 GSPS Direct Digital Synthesizer (DDS)
AD9520
Clock Generator and Distribution IC
ADCLK846 High Speed LVDS Clock Fanout Buffer
Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers
CIRCUIT FUNCTION AND BENEFITS
Synchronization of multiple DDS devices allows precise digital
tuning control of the phase and amplitude across multiple
frequency carriers. This type of control is useful in radar
applications and quadrature (I/Q) upconversion for side-band
suppression.
LVDS
LEVELS
ADCLK846
Q0
Q0
Q1
CLK1
Q1
Q2
CLK1
Q2
Q3
Q3
AD9520 PECL
LEVELS
Q0
Q1
Q2
Q3
Q4
CMOS
LEVEL
DG2020A CMOS
LEVELS
DATA
GENERATOR
CLOCK
The circuit in Figure 1 demonstrates how to synchronize four
AD9910 1 GSPS, DDS chips using the AD9520 clock generator
and the ADCLK846 clock fanout buffer. The result is precise
phase alignment between the clock and output signals of four
AD9910 devices.
LVDS
LEVELS
+ SYNC_IN
SYNC_CLK
– SYNC_IN
AOUT
AD9910
(MASTER)
REF CLK
+ SYNC_OUT
IO_UPDATE – SYNC_OUT
REF CLK
SYNC_CLK
IO_UPDATE
AD9910
(SLAVE)
AOUT
CH1
+ SYNC_IN
– SYNC_IN
CH2
REF CLK
SYNC_CLK
CH3
IO_UPDATE
AOUT
CH4
AD9910
(SLAVE)
+ SYNC_IN
– SYNC_IN
REF CLK
SYNC_CLK
IO_UPDATE
AD9910
(SLAVE)
AOUT
+ SYNC_IN
– SYNC_IN
Figure 1. Setup for Synchronization of Multiple AD9910’s (Simplified Schematic: Decoupling, Power, and All Connections Not Shown)
Rev. A
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engineers. Standard engineering practices have been employed in the design and construction of
each circuit, and their function and performance have been tested and verified in a lab environment
at room temperature. However, you are solely responsible for testing the circuit and determining its
suitability and applicability for your use and application. Accordingly, in no event shall Analog
Devices be liable for direct, indirect, special, incidental, consequential or punitive damages due to
anycausewhatsoeverconnectedtotheuseofany“CircuitfromtheLab”. (Continuedonlastpage)
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©2009 Analog Devices, Inc. All rights reserved.
 

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