MP7636A
15 V CMOS Microprocessor Compatible
Double-Buffered, Multiplying 16-Bit
Digital-to-Analog Converter
FEATURES
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Four Quadrant Multiplication
16-Bit Monotonicity
Lower Data Bus Feedthrough @ CS = 1
Low Feedthrough Error
Low Power Consumption
TTL/5 V CMOS Compatible
Double Buffered
Decoded DAC Approach
Latch-Up Free
BENEFITS
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High Accuracy Performance at Low Cost
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Easy Interface with 8-Bit Microprocessors
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Simple Upgrade of MP1230A Family to High
Accuracy (Pin Compatible)
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Reduced Board Space
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16-Bit Bus Version: MP7626
GENERAL DESCRIPTION
The MP7636A is manufactured using advanced thin film
resistors on a double metal CMOS process. The MP7636A
incorporates a unique bit decoding technique yielding lower
glitch, higher speed and excellent accuracy over temperature
and time. 16-bit differential non-linearity is achieved with
minimal laser trim.
The MP7636A is packaged in a 20-pin 300 mil wide DIP and is
a direct 16-bit replacement for the 12-bit DAC1230 series. Full
pin-for-pin compatibility allows existing systems to be upgraded
to 16 bits without hardware modification.
The MP7636A provides 16-bit data loading through 8 input
data lines for direct interface to 8-bit data buses. All data loading
and data transfer operations are identical to the WRITE cycle of
a static RAM.
The MP7636A uses a unique circuit which significantly
reduces transients in the supplies during DATA bus transitions
at CS = 1.
SIMPLIFIED BLOCK DIAGRAM
DB15 (MSB)
(DB7)
DB14
(DB6)
DB13
(DB5)
DB12
(DB4)
DB11
(DB3)
DB10
(DB2)
DB9
(DB1)
DB8
(DB0, LSB)
8-Bit
Input
Latch
16-Bit
Register
16-Bit
MDAC
R
FB
I
OUT1
I
OUT2
8-Bit
Input
Latch
LE
When LE = 1 latch outputs follow inputs
When LE = 0 Latch outputs are latched
BYTE1/BYTE2
CS
WR1
XFER
WR2
LE
V
DD
V
REF
DGND
AGND
Rev. 2.00
1
EXAR [ EXAR CORPORATION ]
