AD7237ABRZ Analog Devices Inc, AD7237ABRZ Datasheet

AD7237ABRZ

Manufacturer Part Number

AD7237ABRZ

Description

IC,D/A CONVERTER,DUAL,12-BIT,BICMOS,SOP,24PIN

Manufacturer

Analog Devices Inc

Series

DACPORT®r

Datasheet

1.AD7237JNZ.pdf (12 pages)

Specifications of AD7237ABRZ

Rohs Compliant

YES

Settling Time

8µs

Number Of Bits

Data Interface

Parallel

Number Of Converters

Voltage Supply Source

Dual ±

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

24-SOIC (7.5mm Width)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power Dissipation (max)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

AD7237ABRZ

Manufacturer:

ADI/亚德诺

Quantity:

20 000

Current page: 1 of 12
Download datasheet (393Kb)

REV. 0

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.

GENERAL DESCRIPTION

The AD7237A/AD7247A is an enhanced version of the industry

standard AD7237/AD7247. Improvements include operation

from 12 V to 15 V supplies, faster interface times and better

reference variations with V

settling times.

The AD7237A/AD7247A is a complete, dual, 12-bit, voltage

output digital-to-analog converter with output amplifiers and

Zener voltage reference on a monolithic CMOS chip. No exter-

nal user trims are required to achieve full specified performance.

Both parts are microprocessor compatible, with high speed data

latches and interface logic. The AD7247A accepts 12-bit paral-

lel data which is loaded into the respective DAC latch using the

WR input and a separate Chip Select input for each DAC. The

AD7237A has a double buffered interface structure and an 8-bit

wide data bus with data loaded to the respective input latch in

two write operations. An asynchronous LDAC signal on the

AD7237A updates the DAC latches and analog outputs.

A REF OUT/REF IN function is provided which allows either

the on-chip 5 V reference or an external reference to be used as

a reference voltage for the part. For single supply operation, two

output ranges of 0 V to +5 V and 0 V to +10 V are available,

while these two ranges plus an additional 5 V range are avail-

able with dual supplies. The output amplifiers are capable of de-

veloping +10 V across a 2 k load to GND.

The AD7237A/AD7247A is fabricated in Linear Compatible

CMOS (LC

that combines precision bipolar circuits with low power CMOS

logic. Both parts are available in a 24-pin, 0.3" wide plastic and

hermetic dual-in-line package (DIP) and are also packaged in a

24-lead small outline (SOIC) package.

FEATURES

Complete Dual 12-Bit DAC Comprising

Improved AD7237/AD7247:

Parallel Loading Structure: AD7247A

(8+4) Loading Structure: AD7237A

Single or Dual Supply Operation

Low Power—165 mW typ in Single Supply

Two 12-Bit CMOS DACs

On-Chip Voltage Reference

Output Amplifiers

Reference Buffer Amplifiers

12 V to 15 V Operation

Faster Interface –30 ns typ Data Setup Time

MOS), an advanced, mixed technology process

. Additional features include faster

PRODUCT HIGHLIGHTS

1. The AD7237A/AD7247A is a dual 12-bit DACPORT

2. The improved interface times of the parts allow easy, direct

3. The AD7237A/AD7247A features a wide power supply

DACPORT is a registered trademark of Analog Devices, Inc.

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

Tel: 617/329-4700

single chip. This single chip design and small package size

offer considerable space saving and increased reliability over

multichip designs.

interfacing to most modern microprocessors, whether they

have 8-bit or 16-bit data bus structures.

range allowing operation from 12 V supplies.

FUNCTIONAL BLOCK DIAGRAMS

Dual 12-Bit DACPORTs

AD7237A/AD7247A

Fax: 617/326-8703

MOS

on a

Related parts for AD7237ABRZ

AD7237ABRZ Summary of contents

Page 1

FEATURES Complete Dual 12-Bit DAC Comprising Two 12-Bit CMOS DACs On-Chip Voltage Reference Output Amplifiers Reference Buffer Amplifiers Improved AD7237/AD7247 Operation Faster Interface –30 ns typ Data Setup Time Parallel Loading Structure: AD7247A (8+4) ...

Page 2

AD7237A/AD7247A–SPECIFICATIONS 100 pF. All specifications Parameter A STATIC PERFORMANCE Resolution 12 3 Relative Accuracy 1 3 Differential Nonlinearity 0.9 3 Unipolar Offset Error 3 3 Bipolar Zero Error 6 ...

Page 3

TIMING CHARACTERISTICS Limit MIN Parameter (A, B Versions NOTES 1 ...

Page 4

AD7237A/AD7247A AD7237A PIN FUNCTION DESCRIPTION (DIP PIN NUMBERS) Pin Mnemonic Description 1 REF INA Voltage Reference Input for DAC A. The reference voltage for DAC A is applied to this pin internally buffered before being applied to the ...

Page 5

AD7247A PIN FUNCTION DESCRIPTION (DIP PIN NUMBERS) Pin Mnemonic Description 1 REF OUT Voltage Reference Output. The internal 5 V analog reference is provided at this pin. To operate the part with internal reference, REF OUT should be connected to ...

Page 6

AD7237A/AD7247A TERMINOLOGY RELATIVE ACCURACY (LINEARITY) Relative Accuracy, or endpoint linearity measure of the maximum deviation of the DAC transfer function from a straight line passing through the endpoints of the transfer func- tion measured after allowing ...

Page 7

Power Supply Current vs. Temperature Noise Spectral Density vs. Frequency Single Supply Sink Current vs. Output Voltage REV. 0 AD7237A/AD7247A DAC-to-DAC Linearity Matching Power Supply Rejection Ratio vs. Frequency Linearity vs. Power Supply Voltage –7– ...

Page 8

AD7237A/AD7247A CIRCUIT INFORMATION D/A Section The AD7237A/AD7247A contains two 12-bit voltage-mode D/A converters consisting of highly stable thin film resistors and high speed NMOS single-pole, double-throw switches. The output voltage from the converters has the same polarity as the refer- ...

Page 9

Table I. AD7247A Truth Table CSA CSB WR Function Data Transfer Data Transfer DAC A Latch Transparent DAC B Latch Transparent Both DAC ...

Page 10

AD7237A/AD7247A APPLYING THE AD7237A/AD7247A The internal scaling resistors provided on the AD7237A/ AD7247A allow several output voltage ranges. The part can produce unipolar output ranges +10 V and a bipolar ...

Page 11

MICROPROCESSOR INTERFACING—AD7247A Figures show interfaces between the AD7247A and the ADSP-2101 DSP processor and the 8086 and 68000 16-bit microprocessors. In all three interfaces, the AD7247A is memory-mapped with a separate memory address for each DAC. AD7247A—ADSP-2101 ...

Page 12

AD7237A/AD7247A Either high byte or low byte data can be written first to the in- put latch. A write to the AD7237A DAC Latch address transfers the data from the input latches to the respective DAC latches and updates both ...

Related keywords

AD7237ABRZ datasheet
AD7237ABRZ data sheet
AD7237ABRZ pdf datasheet
AD7237ABRZ component
AD7237ABRZ part
AD7237ABRZ distributor
AD7237ABRZ RoHS
AD7237ABRZ datasheet download