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AD9878
TABLE OF CONTENTS
Electrical Characteristics.................................................................4
Rev. A | Page 2 of 36
Absolute Maximum Ratings............................................................7
Explanation of Test Levels...........................................................7
Thermal Characteristics..............................................................7
ESD Caution..................................................................................7
Pin Configuration and Function Descriptions.............................8
Typical Performance Characteristics...........................................10
Terminology....................................................................................13
Register Bit Definitions..................................................................14
Register 0x00—Initialization ....................................................15
Register 0x01—Clock Configuration.......................................15
Register 0x02—Power-Down....................................................15
Register 0x03—Flag Control.....................................................15
Register 0x04—∑- Control Word...........................................15
Register 0x07—Video Input Configuration............................16
Register 0x08—ADC Clock Configuration............................16
Register 0x0C—Die Revision....................................................16
Register 0x0D—Tx Frequency Tuning Words LSBs..............16
Register 0x0E—DAC Gain Control.........................................16
Register 0x0F—Tx Path Configuration...................................16
Registers 0x10 Through 0x17—Burst Parameter...................17
Serial Interface for Register Control............................................18
General Operation of the Serial Interface...............................18
Instruction Byte..........................................................................18
Serial Interface Port Pin Descriptions.....................................18
MSB/LSB Transfers.....................................................................19
Notes on Serial Port Operation................................................19
Theory of Operation......................................................................20
Transmit Path..............................................................................21
Data Assembler...........................................................................21
Transmit Timing......................................................................... 21
Interpolation Filter..................................................................... 21
Half-Band Filters (HBFs).......................................................... 21
Cascade Integrator Comb (CIC) Filter.................................... 21
Combined Filter Response........................................................ 21
Digital Upconverter................................................................... 22
Tx Signal Level Considerations................................................ 22
Tx Throughput and Latency..................................................... 23
DAC.............................................................................................. 23
Programming the AD8321/AD8323 or
AD8322/AD8327/AD8238 Cable-Driver Amplifiers............ 23
OSCIN Clock Multiplier........................................................... 24
Clock and Oscillator Circuitry................................................. 24
Programmable Clock Output REFCLK .................................. 24
Power-Up Sequence................................................................... 26
Reset............................................................................................. 26
Transmit Power-Down.............................................................. 26
∑- Outputs ................................................................................ 27
Receive Path (Rx)....................................................................... 27
IF10 and IF12 ADC Operation ................................................ 27
ADC Voltage References........................................................... 29
Video Input ................................................................................. 29
PCB Design Considerations.......................................................... 30
Component Placement.............................................................. 30
Power Planes and Decoupling.................................................. 30
Ground Planes............................................................................ 30
Signal Routing............................................................................. 30
Outline Dimensions....................................................................... 36
Ordering Guide .......................................................................... 36