Datasheet

AD9148 Data Sheet
Rev. B | Page 2 of 72
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Typical Signal Chain ......................................................................... 1
Revision History ............................................................................... 3
Functional Block Diagram .............................................................. 4
Specifications ..................................................................................... 5
DC Specifications ......................................................................... 5
Input/Output Signal Specifications ............................................ 6
Digital Input Data Timing Specifications ................................. 7
AC Specifications .......................................................................... 8
Absolute Maximum Ratings ............................................................ 9
Thermal Resistance ...................................................................... 9
Maximum Safe Power Dissipation ............................................. 9
ESD Caution .................................................................................. 9
Pin Configurations and Function Descriptions ......................... 11
Typical Performance Characteristics ........................................... 15
Terminology .................................................................................... 21
Serial Peripheral Interface ............................................................. 22
General Operation of the Serial Interface ............................... 22
Data Format ................................................................................ 22
SPI Pin Descriptions .................................................................. 22
SPI Options ................................................................................. 23
SPI Register Map ............................................................................. 24
SPI Register Descriptions .......................................................... 26
Input Data Ports .............................................................................. 40
Dual-Port Mode .......................................................................... 40
Single-Port Mode ........................................................................ 40
Byte Mode .................................................................................... 41
Data Interface Options .............................................................. 41
Recommended Frame Input Bias Circuitry ............................ 41
FIFO Operation .............................................................................. 42
Synchronizing and Resetting the FIFO ................................... 43
Monitoring the FIFO Status ...................................................... 44
Device Synchronization ................................................................. 45
Synchronizing Multiple Devices .............................................. 45
Synchronization with Clock Multiplication ............................... 45
Synchronization with Direct Clocking .................................... 47
Additional Synchronization Features ...................................... 48
Interface Timing ............................................................................. 49
Digital Data Path ............................................................................ 50
Premodulation ............................................................................ 50
Programmable Inverse Sinc Filter ............................................ 50
Interpolation Filters ................................................................... 51
Fine Modulation ......................................................................... 54
Quadrature Phase Correction ................................................... 55
DC Offset Correction ................................................................ 55
Digital Gain Control .................................................................. 55
Clock Generation ........................................................................... 56
DAC Input Clock Configurations ............................................ 56
Driving the CLK_x and REFCLK_x Inputs ............................ 56
Direct Clocking .......................................................................... 56
Clock Multiplication .................................................................. 57
Analog Outputs............................................................................... 59
Transmit DAC Operation .......................................................... 59
Auxiliary DAC Operation ......................................................... 60
Interfacing to Modulators ......................................................... 61
Device Power Dissipation .............................................................. 63
Temperature Sensor ....................................................................... 65
Interrupt Request Operation ........................................................ 66
Interrupt Service Routine .......................................................... 66
Interface Timing Validation .......................................................... 67
SED Operation ............................................................................ 67
SED Example .............................................................................. 67
Example Start-Up Routine ............................................................ 68
Derived PLL Settings ................................................................. 68
Derived NCO Settings ............................................................... 68
Start-Up Sequence ...................................................................... 68
Device Verification Sequence ................................................... 68
Outline Dimensions ....................................................................... 69
Ordering Guide .......................................................................... 70