120 mA, Current Sinking,
10-Bit, I
2
C DAC
AD5398A
Rev. 0
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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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Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2008 Analog Devices, Inc. All rights reserved.
FEATURES
Current sink: 120 mA
2-wire, (I
2
C-compatible) 1.8 V serial interface
10-bit resolution
Integrated current sense resistor
Power supply: 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
Available in 3 × 3 array WLCSP package
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 control
Fan control
Cooler (Peltier) control
Solenoid control
Valve control
Linear actuator control
Light control
Current loop control
GENERAL DESCRIPTION
The AD5398A is a single, 10-bit digital-to-analog converter
(DAC) with a current sink output capability of 120 mA. This
device 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 (1.8 V, I
2
C®-compatible) serial interface that operates
at clock rates up to 400 kHz.
The AD5398A incorporates a power-on reset circuit, which
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 0.5 µA
typically.
The AD5398A is designed for autofocus, image stabilization,
and optical zoom applications in camera phones, digital still
cameras, and camcorders. The AD5398A 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 address range for the
AD5398A is 0x18 to 0x1F inclusive.
FUNCTIONAL BLOCK DIAGRAM
07795-001
POWER-ON
RESET
D1
SDA
AGNDDGND
DD
SCL
PD
I
SINK
V
DD
R
SENSE
3.3Ω
I
2
C SERIAL
INTERFACE
10-BIT
CURRENT
OUTPUT DAC
REFERENCE
R
AD5398A
DGND
Figure 1.
