AD7228ABQ AD [Analog Devices], AD7228ABQ Datasheet

AD7228ABQ

Manufacturer Part Number

AD7228ABQ

Description

LC2MOS Octal 8-Bit DAC

Manufacturer

AD [Analog Devices]

Datasheet

1.AD7228ABQ.pdf (8 pages)

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GENERAL DESCRIPTION

The AD7228A contains eight 8-bit voltage-mode digital-to-

analog converters, with output buffer amplifiers and interface

logic on a single monolithic chip. No external trims are required

to achieve full specified performance for the part.

Separate on-chip latches are provided for each of the eight D/A

converters. Data is transferred into the data latches through a

common 8-bit TTL/CMOS (5 V) compatible input port. Ad-

dress inputs A0, A1 and A2 determine which latch is loaded

when WR goes low. The control logic is speed compatible with

most 8-bit microprocessors.

Specified performance is guaranteed for input reference voltages

from +2 to +10 V when using dual supplies. The part is also

specified for single supply +15 V operation using a reference of

+10 V and single supply +5 V operation using a reference of

+1.23 V. Each output buffer amplifier is capable of developing

+10 V across a 2 k load.

The AD7228A is fabricated on an all ion-implanted, high-

speed, Linear Compatible CMOS (LC

been specifically developed to integrate high-speed digital logic

circuits and precision analog circuits on the same chip.

REV. A

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.

FEATURES

Eight 8-Bit DACs with Output Amplifiers

Operates with Single +5 V, +12 V or +15 V

No User Trims Required

Skinny 24-Pin DlPs, SOIC, and 28-Terminal Surface

P Compatible (95 ns WR Pulse)

or Dual Supplies

Mount Packages

MOS) process which has

PRODUCT HIGHLIGHTS

1. Eight DACs and Amplifiers in Small Package

2. Single or Dual Supply Operation

3. Microprocessor Compatibility

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

Tel: 617/329-4700

The single-chip design of eight 8-bit DACs and amplifiers al-

lows a dramatic reduction in board space requirements and

offers increased reliability in systems using multiple convert-

ers. Its pinout is aimed at optimizing board layout with all

analog inputs and outputs at one side of the package and all

digital inputs at the other.

The voltage-mode configuration of the DACs allows single

supply operation of the AD7228A. The part can also be oper-

ated with dual supplies giving enhanced performance for

some parameters.

The AD7228A has a common 8-bit data bus with individual

DAC latches, providing a versatile control architecture for

simple interface to microprocessors. All latch enable signals

are level triggered and speed compatible with most high per-

formance 8-bit microprocessors.

FUNCTIONAL BLOCK DIAGRAM

Octal 8-Bit DAC

AD7228A

Fax: 617/326-8703

MOS

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AD7228ABQ Summary of contents

Page 1

FEATURES Eight 8-Bit DACs with Output Amplifiers Operates with Single + Dual Supplies P Compatible ( Pulse) No User Trims Required Skinny 24-Pin DlPs, SOIC, and 28-Terminal Surface Mount Packages ...

AD7228A–SPECIFICATIONS ( DUAL SUPPLY noted.) All specifications Parameter Version STATIC PERFORMANCE Resolution 8 3 Total Unadjusted Error 2 Relative Accuracy 1 Differential Nonlinearity 1 4 Full-Scale Error 1 Zero ...

Page 3

V SUPPLY OPERATION B Parameter Version STATIC PERFORMANCE Resolution 8 Relative Accuracy 2 Differential Nonlinearity 1 Full-Scale Error 4 Zero Code Error @ MIN MAX REFERENCE INPUT Reference Input Range 1.2 1.3 ...

Page 4

... C to +85 C AD7228ACN – +85 C AD7228ABP – +85 C AD7228ACP – +85 C AD7228ABR – +85 C AD7228ACR – +85 C AD7228ABQ – +85 C AD7228ACQ – + AD7228ATQ – +125 C 3 AD7228AUQ – +125 C NOTES 1 To order MIL-STD-883, Class B processed parts, add /883B to part number ...

Page 5

OP AMP SECTION Each voltage-mode D/A converter output is buffered by a unity gain noninverting CMOS amplifier. This buffer amplifier is tested with and 100 pF load but will typically drive and 500 pF ...

Page 6

AD7228A Table II. Unipolar Code Table DAC Latch Contents MSB LSB Analog Output REF REF ...

Page 7

DACs for correct timing relationships during the calibration cycle of the instrument. Figure 10b. AD7228A Timing Deskew Circuit COARSE/FINE ADJUST The DACs on the AD7228A can be paired together to form a coarse/fine adjust function as indicated in Figure 11. ...

Page 8

AD7228A Figure 16. AD7228A to 68008 Interface Plastic DIP (N-24) SOIC (R-24) Figure 17. AD7228A to MCS-51 Interface OUTLINE DIMENSIONS Dimensions shown in inches and (mm). –8– Cerdip (Q-24) PLCC (P-28A) REV. A ...

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