MP7628 查看數據表（PDF） - Exar Corporation

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MP7628

5 V CMOS Quad Multiplying 8-Bit Digital-to-Analog Converter

Exar Corporation 

MP7628

5 V CMOS

Quad Multiplying 8-Bit

Digital-to-Analog Converter

FEATURES

• Readback Capability for all DACs

• On-Chip Latches for All DACs

• Linearity Grades to +1/8 LSB

• Single Supply Voltage (5 Volt)

• DACs Matched to 1%

• Four Quadrant Multiplication

• Microprocessor TTL/CMOS Compatible

• Latch-Up Free

• Dual Version: MP7529B

APPLICATIONS

• Microprocessor Controlled Gain and Attenuation

Circuits

• Microprocessor Controlled/Programmable

Power Supplies

• Hardware Redundant Applications Requiring

Data Readback

GENERAL DESCRIPTION

The MP7628 is a quad 8-bit Digital-to-Analog Converter de-

signed using a decoded DAC architecture featuring excellent

DAC-to-DAC matching and guaranteed monotonicity.

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

easy microprocessor interface.

The readback function allows the user to poll or read the data

latches, eliminating the need for storing information in RAM. In

the event the microprocessor power supply is interrupted, it can

poll the DACs to establish the last known system state.

Data is transferred into any of the four DAC data latches via

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

DS1, DS2 and A/B determine which DAC is to be loaded. The

MP7628’s load cycle is similar to the write cycle of a random ac-

cess memory and the device is bus compatible with most 8-bit

microprocessors.

The device operates at +5 V power supply and dissipates

less than 5mW.

All DACs offer excellent four quadrant multiplication charac-

teristics with a separate reference input and feedback resistor

for each DAC.

SIMPLIFIED BLOCK DIAGRAM

DB0

(LSB)

DATA BUS

DB7

(MSB)

BI-

DIRECTIONAL

LINE

DRIVER

VDD

A/B

R/W

DS1

DS2

CONTROL

LOGIC

Rev. 2.00

GND

LATCH A

THREE-STATE

BUFFER

LATCH B

THREE-STATE

BUFFER

LATCH C

THREE-STATE

BUFFER

LATCH D

THREE-STATE

BUFFER

1

VREFB VREFA

RFB

DAC A

DAC B

RFB

RFB

DAC C

DAC D

RFB

VREFC VREFD

RFBA

IOUT1A

IOUT2A/

IOUT2B

IOUT1B

RFBB

RFBC

IOUT1C

IOUT2C/

IOUT2D

IOUT1D

RFBD

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