2.5 V to 5.5 V, 230 μA, Dual Rail-to-Rail,

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

AD5302/AD5312/AD5322

Rev. D

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.

Trademarks and registered trademarks are the property of their respective owners.

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

Tel: 781.329.4700 www.analog.com

FEATURES

AD5302: Two 8-bit buffered DACs in 1 package

A version: ±1 LSB INL, B version: ±0.5 LSB INL

AD5312: Two 10-bit buffered DACs in 1 package

A version: ±4 LSB INL, B version: ±2 LSB INL

AD5322: Two 12-bit buffered DACs in 1 package

A version: ±16 LSB INL, B version: ±8 LSB INL

10-lead MSOP

Micropower operation: 300 μA @ 5 V (including

reference current)

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

2.5 V to 5.5 V power supply

Double-buffered input logic

Guaranteed monotonic by design over all codes

Buffered/Unbuffered reference input options

0 V to V

REF

output voltage

Power-on-reset to 0 V

Simultaneous update of DAC outputs via

LDAC

Low power serial interface with Schmitt-triggered inputs

On-chip rail-to-rail output buffer amplifiers

Qualified for automotive applications

APPLICATIONS

Portable battery-powered instruments

Digital gain and offset adjustment

Programmable voltage and current sources

Programmable attenuators

GENERAL DESCRIPTION

The AD5302/AD5312/AD5322 are dual 8-, 10-, and 12-bit

buffered voltage output DACs in a 10-lead MSOP that operate

from a single 2.5 V to 5.5 V supply, consuming 230 A at 3 V.

Their on-chip output amplifiers allow the outputs to swing rail-

to-rail with a slew rate of 0.7 V/s. The AD5302/AD5312/AD5322

utilize a versatile 3-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 references for the two DACs are derived from two reference

pins (one per DAC). The reference inputs can be configured as

buffered or unbuffered inputs. The outputs of both DACs can be

updated simultaneously using the asynchronous

LDAC

input.

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

that the DAC outputs power-up to 0 V and remain there until a

valid write takes place to the device. The parts contain a power-

down feature that reduces the current consumption of the

devices to 200 nA at 5 V (50 nA at 3 V) and provides software-

selectable output loads while in power-down mode.

The low power consumption of these parts in normal operation

makes them ideally suited for portable battery-operated

equipment. The power consumption is 1.5 mW at 5 V, 0.7 mW

at 3 V, reducing to 1 W in power-down mode.

FUNCTIONAL BLOCK DIAGRAM

DAC

RESISTOR

NETWORK

POWER-DOWN

LOGIC

RESISTOR

NETWORK

BUFFER

STRING

DAC

STRING

DAC

AD5302/AD5312/AD5322

INPUT

DAC

INTERFACE

LOGIC

SCLK

POWER-ON

RESET

REF

OUT

GNDV

REF

LDAC

DIN

00928-001

SYNC

BUFFER

Figure 1.

AD5302/AD5312/AD5322

Rev. D | Page 2 of 24

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

AC Specifications.......................................................................... 4

Timing Characteristics ................................................................ 5

Absolute Maximum Ratings............................................................ 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Terminology ...................................................................................... 9

Typical Performance Characteristics ........................................... 10

Functional Description .................................................................. 14

Digital-to-Analog Section ......................................................... 14

Resistor String............................................................................. 14

DAC Reference Inputs ............................................................... 14

Output Amplifier........................................................................ 14

Power-On Reset .......................................................................... 14

Serial Interface ................................................................................ 15

Input Shift Register..................................................................... 15

Low Power Serial Interface ....................................................... 15

Double-Buffered Interface ........................................................ 15

Power-Down Modes ...................................................................... 16

Microprocessor Interfacing........................................................... 17

AD5302/AD5312/AD5322 to ADSP-2101/ADSP-2103

Interface ....................................................................................... 17



AD5302/AD5312/AD5322 to 68HC11/68L11 Interface ...... 17

AD5302/AD5312/AD5322 to 80C51/80L51 Interface.......... 17

AD5302/AD5312/AD5322 to MICROWIRE Interface ........ 17

Applications Information.............................................................. 18

Typical Application Circuit....................................................... 18

Bipolar Operation Using the AD5302/AD5312/AD5322..... 18

Opto-Isolated Interface for Process Control Applications ... 19

Decoding Multiple AD5302/AD5312/AD5322s.................... 19

AD5302/AD5312/AD5322 as a Digitally Programmable

Window Detector....................................................................... 19



Coarse and Fine Adjustment Using the

AD5302/AD5312/AD5322 ....................................................... 20



Power Supply Bypassing and Grounding................................ 20

Outline Dimensions ....................................................................... 21

Ordering Guide .......................................................................... 22

REVISION HISTORY

5/11—Rev. C to Rev. D

Added Automotive Products Information ................. Throughout

Updated Outline Dimensions....................................................... 21

Changes to Ordering Guide .......................................................... 22

4/06—Rev. B to Rev. C

Updated Format..................................................................Universal

Updated Outline Dimensions....................................................... 21

Changes to Ordering Guide .......................................................... 21

12/05—Rev. A to Rev. B

Updated Format..................................................................Universal

Updated Outline Dimensions....................................................... 21

Changes to Ordering Guide.......................................................... 21

8/03—Rev. 0 to Rev. A

Changes to Features ..........................................................................1

Changes to Specifications.................................................................2

Changes to Absolute Maximum Ratings........................................4

Changes to Ordering Guide.............................................................4

Updated Outline Dimensions....................................................... 16

AD5302/AD5312/AD5322

Rev. D | Page 3 of 24

SPECIFICATIONS

= 2.5 V to 5.5 V, V

REF

= 2 V, R

= 2 kΩ to GND, C

= 200 pF to GND, all specifications T

MIN

to T

MAX

, unless otherwise noted.

Table 1.

A Version

B Version

Parameter

Min Typ Max Min Typ Max Unit Test Conditions/Comments

DC PERFORMANCE

3, 4

AD5302

Resolution 8 8 Bits

Relative Accuracy ±0.15 ±1 ±0.15 ±0.5 LSB

Differential Nonlinearity ±0.02 ±0.25 ±0.02 ±0.25 LSB Guaranteed monotonic by design over all codes

AD5312

Resolution 10 10 Bits

Relative Accuracy ±0.5 ±4 ±0.5 ±2 LSB

Differential Nonlinearity ±0.05 ±0.5 ±0.05 ±0.5 LSB Guaranteed monotonic by design over all codes

AD5322

Resolution 12 12 Bits

Relative Accuracy ±2 ±16 ±2 ±8 LSB

Differential Nonlinearity ±0.2 ±1 ±0.2 ±1 LSB Guaranteed monotonic by design over all codes

Offset Error ±0.4 ±3 ±0.4 ±3 % of FSR

See

Figure 3 and Figure 4

Gain Error ±0.15 ±1 ±0.15 ±1 % of FSR

See

Figure 3 and Figure 4

Lower Deadband 10 60 10 60 mV

See

Figure 3 and Figure 4

Offset Error Drift

−12 −12 ppm of

FSR/°C

Gain Error Drift

−5 −5 ppm of

FSR/°C

Power Supply Rejection

Ratio

−60 −60 dB V

= ±10%

DC Crosstalk

30 30 µV

DAC REFERENCE INPUTS

REF

Input Range 1 V

1 V

V Buffered reference mode

0 V

V Unbuffered reference mode

REF

Input Impedance >10 >10 MΩ Buffered reference mode

180 180 kΩ Unbuffered reference mode, input impedance = R

DAC

Reference Feedthrough −90 −90 dB Frequency = 10 kHz

Channel-to-Channel

Isolation

−80 −80 dB Frequency = 10 kHz

OUTPUT CHARACTERISTICS

Minimum Output Voltage

0.001 0.001 V min A measure of the minimum drive capability of

the output amplifier

Maximum Output Voltage

−

0.001

−

0.001

V max A measure of the maximum drive capability of

the output amplifier

DC Output Impedance 0.5 0.5 Ω

Short-Circuit Current 50 50 mA V

= 5 V

20 20 mA V

= 3 V

Power-Up Time 2.5 2.5 µs Coming out of power-down mode, V

= 5 V

5 5 µs Coming out of power-down mode, V

= 3 V

LOGIC INPUTS

Input Current ±1 ±1 µA

, Input Low Voltage 0.8 0.8 V V

= 5 V ± 10%

0.6 0.6 V V

= 3 V ± 10%

0.5 0.5 V V

= 2.5 V

, Input High Voltage 2.4 2.4 V V

= 5 V ± 10%

2.1 2.1 V V

= 3 V ± 10%

2.0 2.0 V V

= 2.5 V

Pin Capacitance 2 3.5 2 3.5 pF

Part #	AD5312BRMZ
Description	DAC 2CH RES-STRING 10-BIT 10MSOP - Rail/Tube
Category	IC
Availability	In Stock
Qty	1

AD5312BRMZ

Related Items

Technical Document