Rainbow-electronics MX7847 User Manual download pdf

_______________General Description

The MX7837/MX7847 are dual, 12-bit, multiplying, volt-

age-output digital-to-analog converters (DACs). Each

DAC has an output amplifier and a feedback resistor.

The output amplifier is capable of developing ±10V

across a 2kΩ load. The amplifier feedback resistor is

internally connected to V

OUT

on the MX7847. No exter-

nal trims are required to achieve full 12-bit performance

over the entire operating temperature range.

The MX7847 has a 12-bit parallel data input, whereas

the MX7837 operates with a double-buffered 8-bit-bus

interface that loads data in two write operations. All

logic signals are level triggered and are TTL and CMOS

compatible. Fast timing specifications make these

DACs compatible with most microprocessors.

________________________Applications

Small Component-Count Analog Systems

Digital Offset/Gain Adjustments

Industrial Process Control

Function Generators

Automatic Test Equipment

Automatic Calibration

Machine and Motion Control Systems

Waveform Reconstruction

Synchro Applications

____________________________Features

♦ Two 12-Bit Multiplying DACs with Buffered

Voltage Output

♦ Specified with ±12V or ±15V Supplies

♦ No External Adjustments Required

♦ Fast Timing Specifications

♦ 24-Pin DIP and SO Packages

♦ 12-Bit Parallel Interface (MX7847)

8-Bit + 4-Bit Interface (MX7837)

______________Ordering Information

Ordering Information continued on last page.

* Contact factory for availability and processing to MIL-STD-883.

MX7837/MX7847

Complete, Dual, 12-Bit

Multiplying DACs

________________________________________________________________

Maxim Integrated Products

DB0/DB8

DB1/DB9

DB2/DB10

DB3/DB11

DB4

DB5

DB6

DB7

LDAC

FBB

DGND

REFB

OUTB

AGNDB

AGNDA

OUTA

REFA

FBA

DIP/SO

TOP VIEW

MX7837

MX7847 on last page.

_________________Pin Configurations

DAC LATCH A

MSB

INPUT

LATCH

LSB

INPUT

LATCH

DAC A



DAC LATCH B

MSB

INPUT

LATCH

LSB

INPUT

LATCH

DAC B

CONTROL

LOGIC

LDAC

DB7

DB0

REFB

REFA

FBA

OUTA

AGNDA

FBB

OUTB

AGNDB

DGND V

MX7837

MX7847 on last page.

_________Typical Operating Circuits

Call toll free 1-800-998-8800 for free samples or literature.

19-0158; Rev 0; 7/93

PART TEMP. RANGE PIN-PACKAGE

MX7837JN

0°C to +70°C 24 Narrow Plastic DIP

MX7837KN 0°C to +70°C 24 Narrow Plastic DIP

MX7837JR 0°C to +70°C 24 Wide SO

MX7837KR 0°C to +70°C 24 Wide SO

MX7837C/D 0°C to +70°C Dice*

ERROR

(LSB)

±1

±1/2

±1

±1/2

±1

1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - Multiplying DACs

_______________General DescriptionThe MX7837/MX7847 are dual, 12-bit, multiplying, volt-age-output digital-to-analog converters (DACs). EachDAC has a

Page 2

MX7837/MX7847Complete, Dual, 12-Bit Multiplying DACs10 ______________________________________________________________________________________DB3/DB11

Page 3

MX7837/MX7847Complete, Dual, 12-Bit Multiplying DACs______________________________________________________________________________________ 11CAA2E1DEe

Page 4

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

Page 5

MX7837/MX7847Complete, Dual, 12-Bit Multiplying DACs2 _______________________________________________________________________________________ABSOLUTE

Page 6

MX7837/MX7847Complete, Dual, 12-Bit Multiplying DACs_______________________________________________________________________________________ 3PARAMETER

Page 7

MX7837/MX7847Complete, Dual, 12-Bit Multiplying DACs4 ________________________________________________________________________________________________

Page 8

MX7837/MX7847Complete, Dual, 12-Bit Multiplying DACs_______________________________________________________________________________________ 5AAGNDAA =

Page 9

MX7837/MX7847_______________Detailed DescriptionD/A SectionFigure 1 shows a simplified circuit diagram for one ofthe DACs and the output amplifier. U

Page 10

CS, WR, A0, and A1 control data loading to the inputlatches. The eight data inputs accept right-justifieddata, which can be loaded to the input latch

Page 11

MX7837/MX7847Bipolar Operation (4-QuadrantMultiplication)Figure 7 shows the MX7837/MX7847 connected forbinary operation. The offset-binary coding is

Page 12

MX7837/MX7847Complete, Dual, 12-Bit Multiplying DACs_______________________________________________________________________________________ 9242322212

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Rainbow-electronics MX7847 User Manual

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