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Analog Devices Semiconductor Electronic Components Datasheet

AD5823 Datasheet

10-Bit VCM Driver

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AD5823 pdf
ADI Confidential
10-Bit VCM Driver for Autofocus
AD5823/AD5823-1
FEATURES
10-bit VCM driver for autofocus
ARC and ESRC enabled for fast autofocus capture
Available in 2 × 3 array, 1.1 mm2 WLCSP
2-wire (I2C-compatible), 1.8 V serial interface
10-bit resolution DAC
100 mA output current sink
Integrated current sense resistor
2.3 V to 3.6 V power supply
Guaranteed monotonic over all codes
Power-down to 5 µA maximum
Internal reference
Ultralow noise preamplifier
Power-on reset
APPLICATIONS
Camera phones
Camera/image modules
Lens autofocus
Shutter/NDF/iris control
Camera enabled PDA
Web cameras
GENERAL DESCRIPTION
The AD58231 and AD5823-1 are single, 10-bit DACs with 100 mA
output current sink capability and integrated Actuator Response
Control™ (ARC™) technology. ARC is a revolutionary autofocus
capture time and image quality enhancing technology developed by
Analog Devices, Inc., and integrated into the AD5823/AD5823-1
VCM drivers.
ARC circuitry applies specialized, patented waveform and appli-
cation technology to underdamped voice coil motors (VCMs)
to reduce mechanical ringing. This technology enables the user
to achieve very fast mechanical settling times and, as a result,
greatly enhances autofocus capture times, image quality, and
user experience.
The AD5823/AD5823-1 feature an internal reference and
operate from a single 2.3 V to 3.6 V supply. The DAC is
controlled via a 2-wire (I2C-compatible) serial interface that
operates at clock rates up to 400 kHz. The 7-bit I2C address
for the AD5823/AD5823-1 is 0xC.
FUNCTIONAL BLOCK DIAGRAM
VDD
SDA
SCL
SHUTDOWN
REFERENCE
POR
10-BIT
DAC
ARC
MCLK
DIGITAL
INTERFACE
RSENSE
0.5
D1
ISINK
Figure 1.
GND
The AD5823/AD5823-1 also incorporate a power-on reset
circuit, which ensures that the DAC output powers up to 0 V
and remains at 0 V until a valid write takes place. To ensure that
minimal power is consumed in shutdown mode, the user can
select the power-down polarity: the AD5823 SHUTDOWN pin
is active low; the AD5823-1 SHUTDOWN pin is active high.
The AD5823/AD5823-1 were designed for autofocus applica-
tions in camera modules, camera phones, digital still cameras,
and camcorders.
The AD5823/AD5823-1 have many industrial applications, such
as controlling temperature, light, and movement over the
temperature range of −40°C to +85°C without derating.
1 Protected by U.S. Patent 5,969,657; other patents pending.
Rev. Sp0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesfor itsuse, norfor any infringementsof patentsorother
rightsofthirdpartiesthatmayresultfrom itsuse.Specificationssubjecttochange withoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks are the property of their respectiveowners.
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
©2010 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD5823 Datasheet

10-Bit VCM Driver

No Preview Available !

AD5823 pdf
AD5823/AD5823-1
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
AC Specifications.......................................................................... 4
I2C Serial Interface Specifications .............................................. 4
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
REVISION HISTORY
7/10—Revision Sp0: Initial Version
ADI Confidential
Theory of Operation .........................................................................9
Shutdown Options ........................................................................9
Autofocus Driver Stage and Pattern Generator ........................9
Actuator Response Control (ARC) Technology..................... 10
Moving Through the VCM Threshold.....................................11
I2C Interface .................................................................................... 13
Write Operation ......................................................................... 13
Read Operation .......................................................................... 14
Other Read/Write Operations.................................................. 15
Applications Information .............................................................. 16
Register Descriptions..................................................................... 17
Register Bit Descriptions........................................................... 18
Outline Dimensions....................................................................... 20
Ordering Guide .......................................................................... 20
Rev. Sp0 | Page 2 of 22


Part Number AD5823
Description 10-Bit VCM Driver
Maker Analog Devices
Total Page 22 Pages
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