AD9578
Data Sheet
TABLE OF CONTENTS
Features .....................................................................................1
Overview .............................................................................25
Crystal Oscillator Gain ........................................................25
Crystal Load Capacitors.......................................................25
PLLs ........................................................................................26
Overview .............................................................................26
PLL Modes of Operation .....................................................26
VCO ....................................................................................27
Charge Pump.......................................................................27
Output Dividers...................................................................27
Loss of Lock Indicator .........................................................27
Resets...................................................................................27
Example Values for 49.152 MHz crystal ..............................28
SPI Programming....................................................................29
Overview .............................................................................29
SPI Description....................................................................29
OTP Programming..............................................................30
Register Map ...........................................................................32
Register Map Bit Descriptions.................................................34
Chip and Manufacturer ID (Register 0, Address 0x00)........34
Applications...............................................................................1
General Description ..................................................................1
Simplified Functional Block Diagram........................................1
Revision History ........................................................................3
Specifications.............................................................................4
Supply Voltage and Current (2.5 V Operation)......................4
Supply Voltage and Current (3.3 V Operation)......................4
Power Dissipation ..................................................................4
Logic Inputs ( , , OEREF, OE1, OE2, OE3, OE4).........5
CS PD1
Reference Inputs (XO1, XO2, XO3, XO4)..............................5
Distribution Clock Outputs (Including REFOUT/ ) 6
REFOUT
Serial Port ..............................................................................9
Digital PLL...........................................................................10
Digital Functions Timing.....................................................10
JitterGeneration Using 49.152 MHz Crystal........................10
Jitter Generation Using 25 MHz Square wave......................11
Absolute Maximum Ratings....................................................12
ESD Caution........................................................................12
Pin Configuration and Function Descriptions.........................13
Typical Performance Characteristics .......................................15
Test Setup and Configuration Circuits.....................................18
Input/Output Termination Recommendations........................19
Getting Started.........................................................................20
Chip Power Monitor and Startup.........................................20
Device Register Programming Using a Register Setup File..20
OTP Programming ..............................................................20
Theory of Operation................................................................21
Overview..............................................................................21
PLL and Output Driver Control..............................................22
Overview..............................................................................22
PLL Enable/Disable..............................................................22
Output Driver Format..........................................................23
Output Configuration Example...........................................23
Reference Input........................................................................24
Overview..............................................................................24
Reference Input....................................................................24
Crystal Oscillator Amplifier Enable.....................................24
Product ID, Chip ID, and User Programing Space (Register 1,
Address 0x01)......................................................................34
External Pin Readback and Override (Register 2, Address
0x02)....................................................................................34
REFOUT/OUTPUT Divider Enable (Register 3, Address
0x03)....................................................................................36
XTAL1 and Output Buffer Configuration (Register 4,
Address 0x04)......................................................................37
Output Driver Configuration (Register 5, Address 0x05)....38
PLL1 Configuration (Register 6, Address 0x06) ..................38
PLL1 Configuration (Register 7, Address 0x07) ..................39
PLL2 Configuration (Register 8, Address 0x08) ..................40
PLL2 Configuration (Register 9, Address 0x09) ..................40
XTAL2 Configuration (Register 10, Address 0x0A).............42
Reserved (Register 11, Address 0x0B)..................................42
PLL1 KVCO Ban d (Register 12, Address 0x0C)......................42
Reserved (Register 13, Address 0x0D).................................42
PLL2 KVCO Ban d (Register 14, Address 0x0E)......................43
PLL Lock Detect (Register 15, Address 0x0F)......................43
Outline Dimensions................................................................44
Ordering Guide ...................................................................44
REFOUT/
Source Selection...................................24
REFOUT
Crystal Oscillator Inputs..........................................................25
Rev. B | Page 2 of 44
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