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ADM8845 Datasheet(PDF) 2 Page - Analog Devices |
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ADM8845 Datasheet(HTML) 2 Page - Analog Devices |
2 / 20 page ADM8845 Rev. 0 | Page 2 of 20 TABLE OF CONTENTS Specifications......................................................................................3 Absolute Maximum Ratings.............................................................4 Thermal Characteristics .............................................................. 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Description ...............................5 Typical Performance Characteristics ..............................................6 Theory of Operation ...................................................................... 10 Output Current Capability ........................................................ 11 Automatic Gain Control............................................................ 11 Current Matching ....................................................................... 11 Brightness Control with a Digital PWM Signal ..................... 11 LED Brightness Control Using a PWM Signal Applied to VPWM ............................................................................................. 13 LED Brightness Control Using a DC Voltage Applied to VBRIGHT .......................................................................................... 13 Applications......................................................................................14 Layout Considerations and Noise ............................................ 14 White LED Shorting .................................................................. 14 Driving Fewer than Six LEDs ................................................... 14 Driving Flash LEDs.................................................................... 15 Driving Camera Light, Main, and Sub LEDs.......................... 15 Driving Four Backlight White LEDs and Flash LEDs........... 16 Power Efficiency ......................................................................... 17 Outline Dimensions ........................................................................18 Ordering Guide .......................................................................... 18 REVISION HISTORY 10/04—Revision 0: Initial Version |
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