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which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

AD5301/AD5311/AD5321*

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1999

+2.5 V to +5.5 V, 120 A, 2-Wire Interface,

Voltage Output 8-/10-/12-Bit DACs

FUNCTIONAL BLOCK DIAGRAM

RESISTOR

NETWORK

BUFFER

DAC

REGISTER

POWER-DOWN

LOGIC

AD5301/AD5311/AD5321

SCL

A0

GND

A1*

REF

POWER-ON

RESET

PD*

SDA

*AVAILABLE ON 8-LEAD VERSION ONLY

8-/10-/12-BIT

DAC

INTERFACE

LOGIC

FEATURES

AD5301: Buffered Voltage Output 8-Bit DAC

AD5311: Buffered Voltage Output 10-Bit DAC

AD5321: Buffered Voltage Output 12-Bit DAC

6-Lead SOT-23 and 8-Lead

SOIC Packages

Micropower Operation: 120

A @ 3 V

Data Readback Capability

+2.5 V to +5.5 V Power Supply

Guaranteed Monotonic By Design Over All Codes

Power-Down to 50 nA @ 3 V

Reference Derived from Power Supply

Power-On-Reset to Zero Volts

On-Chip Rail-to-Rail Output Buffer Amplifier

Three Power-Down Functions

APPLICATIONS

Portable Battery Powered Instruments

Digital Gain and Offset Adjustment

Programmable Voltage and Current Sources

Programmable Attenuators

GENERAL DESCRIPTION

The AD5301/AD5311/AD5321 are single 8-, 10- and 12-bit

buffered voltage-output DACs that operate from a single +2.5 V

to +5.5 V supply consuming 120

µA at 3 V. The on-chip output

amplifier allows rail-to-rail output swing with a slew rate of

0.7 V/

operates at clock rates up to 400 kHz. Multiple devices can

share the same bus.

The reference for the DAC is derived from the power supply

inputs and thus gives the widest dynamic output range. These

parts incorporate a power-on-reset circuit, which ensures that

the DAC output powers-up to zero volts and remains there until

a valid write takes place. The parts contain a power-down feature

which reduces the current consumption of the device to 50 nA

at 3 V and provides software-selectable output loads while in

power-down mode.

The low power consumption in normal operation make these

DACs ideally suited to portable battery-operated equipment.

The power consumption is 0.75 mW at 5 V, 0.36 mW at 3 V

reducing to 1

µW in all power-down modes.

I

*Protected by U.S. Patent No. 5684481, other patent pending.