Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- FUNCTIONAL BLOCK DIAGRAM
- PRODUCT OVERVIEW
- SPECIFICATIONS
- ABSOLUTE MAXIMUM RATINGS
- PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
- TYPICAL PERFORMANCE CHARACTERISTICS
- TYPICAL APPLICATION CIRCUITS
- THEORY OF OPERATION
- MODES OF OPERATION
- SERIAL PORT OPERATION
- REGISTER MAP AND DESCRIPTION
- OUTLINE DIMENSIONS
AD9540
Rev. A | Page 17 of 32
TYPICAL APPLICATION CIRCUITS
DAC
REFIN
CLK2
CP_OUT
DDS
÷N
÷M
÷R
LPF
VCO
CML
DRIVER
PHASE FREQUENCY
DETECTOR/CHARGE PUMP
25MHz
CRYSTAL
400MHz
CLOCK1
CLOCK1′
AD9540
04947-042
LPF
ADCMP563
Figure 32. Dual Clock Configuration
DAC
CHARGE
PUMP
REFIN
CLK2
DDS
÷N
÷M
÷R
LPF
VCO
CML
DRIVER
PHASE FREQUENCY
DETECTOR
EXTERNAL
REFERENCE
622MHz
CLOCK1
CLOCK2
AD9540
04947-043
ADCMP563
Figure 33. Optical Networking Clock
REFIN
CLK2
CP_OUT
DDS
÷R
VCO
AD9540
04947-044
LPF
LPF
DAC
Figure 34 Fractional-Divider Loop
CHARGE
PUMP
REFIN
CLK2
÷N
VCO
DDS
PHASE
FREQUENCY
DETECTOR
04947-045
LPF
LPF
DAC
AD9540
Figure 35. Direct Upconversion of DDS Output Spectrum