MP7528
CMOS
Dual Buffered Multiplying 8-Bit
Digital-to-Analog Converter
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
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
V
DD
V
REFA
DB7-DB0
DACA/DACB
CS
WR
R
FBB
D
Q
LATCH B
E
DAC B
I
OUTB
AGND
OUT
R
FBA
DB7-DB0
DACA/DACB
D
Q
LATCH A
E
DAC A
I
OUTA
CS
WR
DGND
V
REFB
Rev. 2.00
1
EXAR [ EXAR CORPORATION ]
