AD9878 datasheet(2/36 Pages) AD

2 / 36 page

AD9878

Rev. A | Page 2 of 36

TABLE OF CONTENTS

Electrical Characteristics ................................................................. 4

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

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

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