120 mA, Current Sinking,

AD5821

Rev. 0

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FEATURES

120 mA current sink

Available in 3 × 3 array WLCSP package

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.

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.

FUNCTIONAL BLOCK DIAGRAM

3.3Ω

R

AD5821

D1

10-BIT

CURRENT

OUTPUT DAC

SDA

AGND

XSHUTDOWN

DGND

SCL

DGND

INTERFACE

REFERENCE

POWER-ON

RESET

Figure 1.