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EVAL-AD5821EBZ1 Datasheet(PDF) 1 Page - Analog Devices |
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EVAL-AD5821EBZ1 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page 120 mA, Current Sinking, 10-Bit, I2C® DAC AD5821 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 ©2007 Analog Devices, Inc. All rights reserved. FEATURES 120 mA current sink Available in 3 × 3 array WLCSP package 2-wire (I2C-compatible) 1.8 V serial interface 10-bit resolution Integrated current sense resistor 2.7 V to 5.5 V power supply Guaranteed monotonic over all codes Power-down to 0.5 μA typical Internal reference Ultralow noise preamplifier Power-down function Power-on reset CONSUMER APPLICATIONS 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 APPLICATIONS Heater controls Fan controls Cooler (Peltier) controls Solenoid controls Valve controls Linear actuator controls Light controls Current loop controls GENERAL DESCRIPTION The AD5821 is a single 10-bit digital-to-analog converter with 120 mA output current sink capability. 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 AD5821 incorporates a power-on reset circuit that ensures that 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 AD5821 is designed for autofocus, image stabilization, and optical zoom applications in camera phones, digital still cameras, and camcorders. The AD5821 also has many industrial applications, such as controlling temperature, light, and movement, over the range of −40°C to +85°C without derating. The I2C address for the AD5821 is 0x18. FUNCTIONAL BLOCK DIAGRAM RSENSE 3.3Ω R AD5821 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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