MP7636A

1

Rev. 2.00

FEATURES

• 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

15 V CMOS Microprocessor Compatible

Double-Buffered, Multiplying 16-Bit

Digital-to-Analog Converter

BENEFITS

• High Accuracy Performance at Low Cost

• Easy Interface with 8-Bit Microprocessors

• Simple Upgrade of MP1230A Family to High

Accuracy (Pin Compatible)

• Reduced Board Space

• 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

DGND

AGND

DB15 (MSB)

(DB7)

DB14

(DB6)

DB13

(DB5)

DB12

(DB4)

DB11

(DB3)

DB10

(DB2)

DB9

(DB1)

DB8

(DB0, LSB)

BYTE1/BYTE2

CS

WR1

XFER

WR2

8-Bit

Input

Latch

16-Bit

Register

16-Bit

MDAC

LE

LE

When LE = 1 latch outputs follow inputs

When LE = 0 Latch outputs are latched

8-Bit

Input

Latch