AD9857
TABLE OF CONTENTS
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
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
Rev. C | Page 2 of 40
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