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AD5821A Datasheet(PDF) 1 Page - Analog Devices |
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AD5821A Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page 120 mA, Current Sinking, 10-Bit, I2C DAC AD5821A Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2008 Analog Devices, Inc. All rights reserved. FEATURES Current sink: 120 mA Available in 3 × 3 array WLCSP package 2-wire, (I2C-compatible) 1.8 V serial interface 10-bit resolution Integrated current sense resistor Power supply range: 2.7 V to 5.5 V Guaranteed monotonic over all codes Power down to 0.5 μA typical Internal reference Ultralow noise preamplifier Power-down function Power-on reset APPLICATIONS Consumer Lens autofocus Image stabilization Optical zoom Shutters Iris/exposure Neutral density (ND) filters Lens covers Camera phones Digital still cameras Camera modules Digital video cameras/camcorders Camera-enabled devices Security cameras Web/PC cameras Industrial Heater controls Fan controls Cooler (Peltier) controls Solenoid controls Valve controls Linear actuator controls Light controls Current loop controls GENERAL DESCRIPTION The AD5821A is a single, 10-bit digital-to-analog converter (DAC) with output current sinking capability of 120 mA. It features an internal reference and operates from a single 2.7 V to 5.5 V supply. The DAC is controlled via a 2-wire, I2C®- compatible serial interface that operates at clock rates up to 400 kHz. The AD5821A incorporates a power-on reset circuit that ensures the DAC output powers up to 0 V and remains there until a valid write takes place. It has a power-down feature that reduces the current consumption of the device to 1 μA maximum. The AD5821A is designed for autofocus, image stabilization, and optical zoom applications in camera phones, digital still cameras, and camcorders. The AD5821A is also suitable for many industrial applications, such as controlling temperature, light, and movement without derating over temperatures ranging from −30°C to +85°C. The I2C 7-bit address for the AD5821A is 0xC. FUNCTIONAL BLOCK DIAGRAM RSENSE 3.3Ω R AD5821A D1 10-BIT CURRENT OUTPUT DAC SDA AGND XSHUTDOWN VDD DGND SCL ISINK DGND VDD I2C SERIAL INTERFACE REFERENCE POWER-ON RESET Figure 1. |
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