AD9549
TABLE OF CONTENTS
Features .............................................................................................. 1
Power-Up......................................................................................... 42
Power-On Reset.......................................................................... 42
Programming Sequence ............................................................ 42
Power Supply Partitioning............................................................. 43
3.3 V Supplies.............................................................................. 43
1.8 V Supplies.............................................................................. 43
Serial Control Port ......................................................................... 44
Serial Control Port Pin Descriptions....................................... 44
Operation of Serial Control Port.............................................. 44
The Instruction Word (16 Bits)................................................ 45
MSB/LSB First Transfers ........................................................... 45
I/O Register Map ............................................................................ 48
I/O Register Descriptions.............................................................. 53
Applications....................................................................................... 1
General Description ......................................................................... 1
Basic Block Diagram ........................................................................ 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
DC Specifications ......................................................................... 4
AC Specifications.......................................................................... 6
Absolute Maximum Ratings............................................................ 9
Thermal Resistance ...................................................................... 9
ESD Caution.................................................................................. 9
Pin Configuration and Function Descriptions........................... 10
Typical Performance Characteristics ........................................... 13
Input/Output Termination Recommendations.......................... 16
Theory of Operation ...................................................................... 17
Overview...................................................................................... 17
Digital PLL Core (DPLLC)........................................................ 17
Phase Detector............................................................................ 21
Digital Loop Filter Coefficients ................................................ 22
Closed-Loop Phase Offset......................................................... 24
Lock Detection............................................................................ 24
Reference Monitors .................................................................... 26
Reference Switchover ................................................................. 27
Holdover ...................................................................................... 29
Output Frequency Range Control............................................ 32
Reconstruction Filter ................................................................. 32
FDBK_IN Inputs ........................................................................ 33
Reference Inputs ......................................................................... 33
SYSCLK Inputs ........................................................................... 33
Harmonic Spur Reduction ........................................................ 35
Output Clock Drivers and 2× Frequency Multiplier............. 36
Frequency Slew Limiter............................................................. 37
Frequency Estimator .................................................................. 37
Status and Warnings................................................................... 39
Thermal Performance.................................................................... 41
Serial Port Configuration (Register 0x0000 to Register
0x0005) ........................................................................................ 53
Power-Down and Reset (Register 0x0010 to Register 0x0013)
....................................................................................................... 53
System Clock (Register 0x0020 to Register 0x0023) ............. 54
Digital PLL Control and Dividers (Register 0x0100 to
Register 0x0130) ......................................................................... 55
Free-Run (Single-Tone) Mode (Register 0x01A0 to Register
0x01AD) ...................................................................................... 61
Reference Selector/Holdover (Register 0x01C0 to Register
0x01C3)........................................................................................ 62
Doubler and Output Drivers (Register 0x0200 to Register
0x0201) ........................................................................................ 63
Monitor (Register 0x0300 to Register 0x0335)....................... 64
Calibration (User-Accessible Trim) (Register 0x0400 to
Register 0x0410) ......................................................................... 70
Harmonic Spur Reduction (Register 0x0500 to Register
0x0509) ........................................................................................ 71
Applications Information .............................................................. 73
Sample Applications Circuit ..................................................... 73
Outline Dimensions....................................................................... 74
Ordering Guide .......................................................................... 74
Rev. D | Page 2 of 76
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