REV. A

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a

AD5310*

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

+2.7 V to +5.5 V, 140 A, Rail-to-Rail

Voltage Output 10-Bit DAC in a SOT-23

FUNCTIONAL BLOCK DIAGRAM

DAC

REGISTER

10-BIT

DAC

INPUT

CONTROL LOGIC

POWER-DOWN

CONTROL LOGIC

OUTPUT

BUFFER

POWER-ON

RESET

AD5310

REF (+) REF (–)

RESISTOR

NETWORK

SYNC

SCLK

DIN

FEATURES

Single 10-Bit DAC

6-Lead SOT-23 and 8-Lead

SOIC Packages

Micropower Operation: 140

A @ 5 V

Power-Down to 200 nA @ 5 V, 50 nA @ 3 V

+2.7 V to +5.5 V Power Supply

Guaranteed Monotonic by Design

Reference Derived from Power Supply

Power-On-Reset to Zero Volts

Three Power-Down Functions

Low Power Serial Interface with Schmitt-Triggered

Inputs

On-Chip Output Buffer Amplifier, Rail-to-Rail

Operation

SYNC Interrupt Facility

APPLICATIONS

Portable Battery Powered Instruments

Digital Gain and Offset Adjustment

Programmable Voltage and Current Sources

Programmable Attenuators

GENERAL DESCRIPTION

The AD5310 is a single, 10-bit buffered voltage out DAC that

operates from a single +2.7 V to +5.5 V supply consuming

115

µA at 3 V. Its on-chip precision output amplifier allows rail-

to-rail output swing to be achieved. The AD5310 utilizes a ver-

satile three-wire serial interface that operates at clock rates up

to 30 MHz and is compatible with standard SPI™, QSPI™,

MICROWIRE™ and DSP interface standards.

The reference for AD5310 is derived from the power supply

inputs and thus gives the widest dynamic output range. The part

incorporates a power-on-reset circuit that ensures that the DAC

output powers up to zero volts and remains there until a valid

write takes place to the device. The part contains a power-down

feature which reduces the current consumption of the device to

200 nA at 5 V and provides software selectable output loads

while in power-down mode. The part is put into power-down

mode over the serial interface.

The low power consumption of this part in normal operation

makes it ideally suited to portable battery operated equipment.

The power consumption is 0.7 mW at 5 V reducing to 1

µW in

power-down mode.

The AD5310 is one of a family of pin-compatible DACs. The

AD5300 is the 8-bit version and the AD5320 is the 12-bit ver-

sion. The AD5300/AD5310/AD5320 are available in 6-lead

SOT-23 packages and 8-lead

µSOIC packages.

PRODUCT HIGHLIGHTS

1. Available in 6-lead SOT-23 and 8-lead

µSOIC packages.

2. Low power, single supply operation. This part operates from

a single +2.7 V to +5.5 V supply and typically consumes

0.35 mW at 3 V and 0.7 mW at 5 V, making it ideal for

battery powered applications.

3. The on-chip output buffer amplifier allows the output of the

DAC to swing rail-to-rail with a slew rate of 1 V/

µs.

4. Reference derived from the power supply.

5. High speed serial interface with clock speeds up to 30 MHz.

Designed for very low power consumption. The interface

only powers up during a write cycle.

6. Power-down capability. When powered down, the DAC

typically consumes 50 nA at 3 V and 200 nA at 5 V.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corporation.

*Patent pending; protected by U.S. Patent No. 5684481.