ADM8843

Rev. 0 | Page 2 of 16

TABLE OF CONTENTS

Specifications......................................................................................3

Absolute Maximum Ratings.............................................................4

Thermal Characteristics .............................................................. 4

ESD Caution.................................................................................. 4

Pin Configuration and Function Descriptions..............................5

Typical Performance Characteristics ..............................................6

Theory of Operation .........................................................................9

Automatic Gain Control............................................................ 10

Brightness Control with a Digital PWM Signal ..................... 10

LED Brightness Control Using a PWM Signal Applied to

VPWM ............................................................................................. 12

LED Brightness Control Using a DC Voltage Applied to

VBRIGHT .......................................................................................... 12

Applications......................................................................................13

Layout Considerations and Noise ............................................ 13

White LED Shorting .................................................................. 13

Driving Four LEDs in the Main Display Only ....................... 13

Driving Fewer than Four LEDs ................................................ 13

Using Smaller Capacitor Values ............................................... 14

Power Efficiency ......................................................................... 15

Outline Dimensions ........................................................................16

Ordering Guide .......................................................................... 16

REVISION HISTORY

10/04—Revision 0: Initial Version