AD7528AQ Analog Devices Inc, AD7528AQ Datasheet

AD7528AQ

Manufacturer Part Number

AD7528AQ

Description

Digital-Analog Converter IC

Manufacturer

Analog Devices Inc

Datasheet

1.AD7528KNZ.pdf (8 pages)

Specifications of AD7528AQ

Rohs Status

RoHS non-compliant

Settling Time

400ns

Number Of Bits

Number Of Converters

Voltage Supply Source

Single Supply

Power Dissipation (max)

450mW

Operating Temperature

-40°C ~ 85°C

Mounting Type

Through Hole

Package / Case

20-CDIP (0.300", 7.62mm)

Data Interface

Lead Free Status / RoHS Status

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GENERAL DESCRIPTION

The AD7528 is a monolithic dual 8-bit digital/analog converter

featuring excellent DAC-to-DAC matching. It is available in

skinny 0.3" wide 20-lead DIPs and in 20-lead surface mount

packages.

Separate on-chip latches are provided for each DAC to allow

easy microprocessor interface.

Data is transferred into either of the two DAC data latches via a

common 8-bit TTL/CMOS compatible input port. Control

input DAC A/DAC B determines which DAC is to be loaded.

The AD7528’s load cycle is similar to the write cycle of a ran-

dom access memory and the device is bus compatible with most

8-bit microprocessors, including 6800, 8080, 8085, Z80.

The device operates from a +5 V to +15 V power supply, dis-

sipating only 20 mW of power.

Both DACs offer excellent four quadrant multiplication charac-

teristics with a separate reference input and feedback resistor for

each DAC.

PRODUCT HIGHLIGHTS

1. DAC-to-DAC matching: since both of the AD7528 DACs are

2. Small package size: combining the inputs to the on-chip DAC

REV. B

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

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

otherwise under any patent or patent rights of Analog Devices.

fabricated at the same time on the same chip, precise match-

ing and tracking between DAC A and DAC B is inherent.

The AD7528’s matched CMOS DACs make a whole new

range of applications circuits possible, particularly in the

audio, graphics and process control areas.

latches into a common data bus and adding a DAC A/DAC B

select line has allowed the AD7528 to be packaged in either a

small 20-lead DIP, SOIC or PLCC.

FEATURES

On-Chip Latches for Both DACs

+5 V to +15 V Operation

DACs Matched to 1%

Four Quadrant Multiplication

TTL/CMOS Compatible

Latch Free (Protection Schottkys not Required)

APPLICATIONS

Digital Control of:

Gain/Attenuation

Filter Parameters

Stereo Audio Circuits

X-Y Graphics

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

Tel: 781/329-4700

Fax: 781/326-8703

Model

AD7528JN

AD7528KN –40 C to +85 C

AD7528LN –40 C to +85 C

AD7528JP

AD7528KP

AD7528LP

AD7528JR

AD7528KR –40 C to +85 C

AD7528LR

AD7528AQ –40 C to +85 C

AD7528BQ –40 C to +85 C

AD7528CQ –40 C to +85 C

AD7528SQ

AD7528TQ –55 C to +125 C

AD7528UQ –55 C to +125 C

NOTES

INPUTS

Analog Devices reserves the right to ship side-brazed ceramic in lieu of cerdip. Parts

Processing to MIL-STD-883C, Class B is available. To order, add suffix “/883B” to

N = Plastic DIP; P = Plastic Leaded Chip Carrier; Q = Cerdip; R = SOIC.

DAC A/

will be marked with cerdip designator “Q.”

part number. For further information, see Analog Devices’ 1990 Military Products

Databook.

DAC B

DGND

DATA

DB7

DB0

FUNCTIONAL BLOCK DIAGRAM

Buffered Multiplying DAC

Temperature

Ranges

–40 C to +85 C

–55 C to +125 C

CONTROL

BUFFER

LOGIC

INPUT

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

ORDERING GUIDE

LATCH

CMOS Dual 8-Bit

Relative

Accuracy Error

1 LSB

1/2 LSB

1 LSB

1/2 LSB

1 LSB

1/2 LSB

1 LSB

1/2 LSB

1 LSB

1/2 LSB

AD7528

REF

DAC B

DAC A

AD7528

Gain

4 LSB N-20

2 LSB N-20

1 LSB N-20

4 LSB P-20A

2 LSB P-20A

1 LSB P-20A

4 LSB R-20

2 LSB R-20

1 LSB R-20

4 LSB Q-20

2 LSB Q-20

1 LSB Q-20

4 LSB Q-20

2 LSB Q-20

1 LSB Q-20

Package

Options

AGND

OUT A

OUT B

Related parts for AD7528AQ

AD7528AQ Summary of contents

Page 1

... AD7528LP – +85 C 1/2 LSB AD7528JR – + LSB AD7528KR – +85 C 1/2 LSB AD7528LR – +85 C 1/2 LSB AD7528AQ – + LSB AD7528BQ – +85 C 1/2 LSB AD7528CQ – +85 C 1/2 LSB AD7528SQ – +125 C 1 LSB AD7528TQ – +125 C 1/2 LSB AD7528UQ – ...

Page 2

AD7528–SPECIFICATIONS Parameter Version 2 STATIC PERFORMANCE Resolution All Relative Accuracy Differential Nonlinearity All Gain Error Gain Temperature Coefficient Gain/ Temperature All ...

Page 3

Parameter Version CHANNEL-TO-CHANNEL ISOLATION OUT B All REF OUT A REF DIGITAL CROSSTALK All HARMONIC DISTORTlON All NOTES 1 Temperature Ranges are Versions: – + ...

Page 4

AD7528 INTERFACE LOGIC INFORMATION DAC Selection: Both DAC latches share a common 8-bit input port. The con- trol input DAC A/DAC B selects which DAC can accept data from the input port. Mode Selection: Inputs CS and WR control the ...

Page 5

V DD DB0 DATA INPUT LATCH INPUTS BUFFER DB7 AD7528 DAC A/ DAC B CONTROL CS LOGIC WR LATCH DGND NOTES: 1 R1, R2 AND R3, R4 USED ONLY IF GAIN ADJUSTMENT IS REQUIRED. SEE TABLE III FOR RECOMMENDED VALUES. ...

Page 6

AD7528 APPLICATIONS INFORMATION Application Hints To ensure system performance consistent with AD7528 specifi- cations, careful attention must be given to the following points: 1. GENERAL GROUND MANAGEMENT transient voltages between the AD7528 AGND and DGND can cause noise ...

Page 7

MICROPROCESSOR INTERFACE A0–A15 ADDRESS BUS A** ADDRESS V DECODE MA LOGIC CPU A + 1** 6800 2 D0–D7 DATA BUS *ANALOG CIRCUITRY HAS BEEN OMITTED FOR CLARITY **A = DECODED 7528 ADDR DAC DECODED 7528 ...

Page 8

AD7528 DIGITALLY CONTROLLED DUAL TELEPHONE ATTENUATOR In this configuration the AD7528 functions as a 2-channel digi- tally controlled attenuator. Ideal for stereo audio and telephone signal level control applications. Table IV gives input codes vs. attenuation for ...

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