AD5255
TABLE OF CONTENTS
Electrical Characteristics ................................................................. 3
Electrical Characteristics ................................................................. 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Interface Descriptions .................................................................... 10
I2C Interface ................................................................................ 10
EEPROM Interface..................................................................... 11
RDAC I2C Interface.................................................................... 12
Theory of Operation ...................................................................... 15
Linear Increment and Decrement Commands ...................... 15
Logarithmic Taper Mode Adjustment (±6 dB/step) .............. 15
Using Additional Internal Nonvolatile EEPROM .................. 16
REVISION HISTORY
7/04—Revision 0: Initial Version
Digital Input/Output Configuration........................................ 16
Multiple Devices on One Bus ................................................... 16
Level Shift for Bidirectional Communication ........................ 16
Terminal Voltage Operation Range ......................................... 16
Power-Up Sequence ................................................................... 17
Layout and Power Supply Biasing ............................................ 17
RDAC Structure.......................................................................... 17
Calculating the Programmable Resistance ............................. 17
Programming the Potentiometer Divider............................... 18
Applications..................................................................................... 19
Laser Diode Driver (LDD) Calibration................................... 19
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 20
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