AD9857

Rev. C | Page 2 of 40

TABLE OF CONTENTS

Revision History ............................................................................... 3

General Description ......................................................................... 4

Specifications..................................................................................... 5

Absolute Maximum Ratings............................................................ 8

Explanation of Test Levels........................................................... 8

ESD Caution.................................................................................. 8

Pin Configuration and Function Descriptions............................. 9

Typical Performance Characteristics ........................................... 11

Modulated Output Spectral Plots............................................. 11

Single-Tone Output Spectral Plots ........................................... 12

Narrow-band SFDR Spectral Plots........................................... 13

Output Constellations................................................................ 14

Modes Of Operation ...................................................................... 15

Quadrature Modulation Mode ................................................. 15

Single-Tone Mode ...................................................................... 16

Interpolating DAC Mode .......................................................... 17

Signal Processing Path ................................................................... 18

Input Data Assembler ................................................................ 18

Inverse CIC Filter ....................................................................... 19

Programmable (2× to 63×) CIC Interpolating Filter............. 21

Quadrature Modulator .............................................................. 21

DDS Core..................................................................................... 21

Inverse SINC Filter ..................................................................... 22

Output Scale Multiplier ............................................................. 22

14-Bit D/A Converter ................................................................ 22

Reference Clock Multiplier ....................................................... 23

Input Data Programming .............................................................. 24

Control Interface—Serial I/O ................................................... 24

General Operation of the Serial Interface............................... 24

Instruction Byte .......................................................................... 26

Serial Interface Port Pin Descriptions ..................................... 26

Control Register Descriptions .................................................. 27

Profile #0...................................................................................... 27

Profile #1...................................................................................... 28

Profile #2...................................................................................... 28

Profile #3...................................................................................... 28

Latency......................................................................................... 30

Ease of Use Features....................................................................... 32

Profile Select................................................................................ 32

Setting the Phase of the DDS.................................................... 32

Reference Clock Multiplier ....................................................... 32

PLL Lock...................................................................................... 32

Single or Differential Clock ...................................................... 33

CIC Overflow Pin....................................................................... 33

Clearing the CIC Filter .............................................................. 33

Digital Power-Down .................................................................. 33

Hardware-Controlled Digital Power-Down ........................... 34

Software-Controlled Digital Power-Down ............................. 34

Full Sleep Mode .......................................................................... 34

Power Management Considerations........................................ 34

Support ........................................................................................ 35

Outline Dimensions ....................................................................... 38

Ordering Guide .......................................................................... 39