White-LED Flash Driver targets cell phone cameras.July 9, 2009 -
Integrating 2 MHz synchronous boost converter, 500 mA programmable current source, and I²C interface, Model ADP1655 maximizes limited current available in battery-operated digital cameras to increase flash brightness to over 200 lumens. In cell phone applications, transmit masking function allows camera flash to run at higher LED current while operating RF transceiver to monitor cellular base station for incoming signals. Device also includes LED grounding and current accuracy of 5%.
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
Original Press release
Analog Devices, Inc.
1 Technology Way, P.O. Box 9106
Norwood, MA, 02062-9106
USA
New Dual White-LED Flash Driver Maximizes Picture Quality in Cell Phone Cameras
- ADI's ADP1655 LED flash driver incorporates advances in transmit masking, current accuracy and LED grounding to ensure brighter flash, more reliable operation and smaller form factors.
NORWOOD, Mass -- Analog Devices, Inc. (ADI), a global leader in high-performance semiconductors for signal-processing applications, today introduced a dual white-LED (light-emitting diode) flash driver that maximizes the limited current available in battery-operated digital cameras to increase flash brightness to over 200 Lumens and improve picture quality. The ADP1655 inductor-based flash driver improves the reliability of high-resolution camera operation in cell phones, digital still cameras, camcorders, PDAs and other camera-equipped portable devices, particularly in dark environments. In a cell phone application, the new driver's proprietary transmit masking function allows the camera flash to run at a higher LED current while simultaneously operating the phone's RF transceiver to monitor the cellular base station for incoming signals.
The ADP1655 integrates a 2-MHz synchronous boost converter, a 500 mA (milli amp) programmable current source, and an I²C interface, which enables timers and currents to be easily programmed and data to be read back relative to system operation and safety controls. With 5 percent flash-current accuracy, the ADP1655 also improves flash brightness by allowing the camera to increase current to the LED without crossing safety thresholds that would trigger the phone to shut down.
The new driver additionally includes a high-side current source that allows the flash LED string to be connected to the camera's ground plane, eliminating the need to route the LEDs back to the IC. This allows designers to simplify printed-circuit board routing, which reduces circuit trace length and thermal dissipation and allows the camera to be designed using a more compact layout. For more information visit: http: www.analog.com/pr/ADP1655.
Availability and Pricing
Product Samples Availability Temperature Range Price Each Packaging
Per 1000
ADP1655 Now Now -40°C to +125°C $0.95 12-ball WLSCP
(0.5-mm pitch)
ADI in Power Management
Analog Devices brings world-class signal-processing prowess to a portfolio of innovative power-management ICs that complement high-performance signal-processing functions in a wide range of portable and fixed-power applications in consumer electronics, medical equipment, industrial and instrumentation, and communications infrastructure. By supporting signal-chain design requirements, such as dynamic range, transient performance, and reliability, ADI helps customers solve complex power challenges easily and quickly, differentiate their products, and get to market faster. Learn more about ADI's power-management ICs at http://www.analog.com/power.
About Analog Devices
Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Celebrating over 40 years as a leading global manufacturer of high-performance integrated circuits used in analog and digital signal processing applications, Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices' common stock is listed on the New York Stock Exchange under the ticker "ADI" and is included in the S&P 500 Index. http://www.analog.com
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Contacts
Analog Devices, Inc.
Howard Wisniowski, 781-937-1517
howard.wisniowski@analog.com
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