MP7528

1

Rev. 2.00

FEATURES

• On-Chip Latches for Both DACs

• +5 V to +15 V Operation

• DACs Matched to 1%

• Four Quadrant Multiplication

• 15 V CMOS Compatible

• See MP7529A or MP7529B for Improved Performance

CMOS

Dual Buffered Multiplying 8-Bit

Digital-to-Analog Converter

APPLICATIONS

• Microprocessor Controlled Gain Circuits

• Microprocessor Controlled Attenuator Circuits

• Microprocessor Controlled Function Generation

• Precision AGC Circuits

• Bus Structured Instruments

GENERAL DESCRIPTION

The MP7528 is a dual 8-bit digital/analog converter designed

using EXAR’s proven decoded DAC architecture. It features ex-

cellent DAC-to-DAC matching and guaranteed monotonicity.

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

DACA/DACB determines which DAC is to be loaded.

The

MP7528’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 from a +5V to +15V power supply with

only 2 mA of current (maximum).

Both DACs offer excellent four quadrant multiplication char-

acteristics with a separate reference input and feedback resistor

for each DAC.

SIMPLIFIED BLOCK AND TIMING DIAGRAM

DGND

LATCH A

LATCH B

DAC A

DAC B

D

E

Q

D

E

Q

DB7-DB0

OUT

DB7-DB0

AGND

DACA/DACB

CS

WR

DACA/DACB

CS

WR