120 mA, Current Sinking,
10-Bit, I
2
C DAC
AD5821A
FEATURES
Current sink: 120 mA
Available in 3 × 3 array WLCSP package
2-wire, (I
2
C-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
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, I
2
C®-
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 I
2
C 7-bit address for the AD5821A is 0xC.
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
FUNCTIONAL BLOCK DIAGRAM
XSHUTDOWN
REFERENCE
POWER-ON
RESET
SDA
SCL
I
2
C SERIAL
INTERFACE
10-BIT
CURRENT
OUTPUT DAC
V
DD
D1
I
SINK
V
DD
DGND
R
AD5821A
DGND
R
SENSE
3.3Ω
07796-001
AGND
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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©2008 Analog Devices, Inc. All rights reserved.
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