Datasheet

ADM8843
Rev. C | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
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 V
PWM
.................................... 12
LED Brightness Control
Using a DC Voltage Applied to V
BRIGHT
................................... 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
1/11—Rev. B to Rev. C
Changes to Figure 14........................................................................ 7
4/10—Rev. A to Rev. B
Removed CP-16-12 Package .............................................Universal
Change to Figure 2 ........................................................................... 5
Change to Figure 6 ........................................................................... 6
Changes to Figure 14........................................................................ 7
Changes to Figure 15........................................................................ 8
Updated Outline Dimensions....................................................... 16
Changes to Ordering Guide .......................................................... 16
12/06—Rev. 0 to Rev. A
Change to Thermal Characteristics Section ................................. 4
Changes to Outline Dimensions................................................... 16
Changes to Ordering Guide .......................................................... 16
10/04—Revision 0: Initial Version