MP7543

1

Rev. 2.00

5 V CMOS

Serial Input 12-Bit

Digital-to-Analog Converter

FEATURES

• 12-Bit DAC with Serial Digital Input Interface

• Nonlinearity +1/2 LSB from Tmin to Tmax

• Low Output Capacitance

• Full 4-Quadrant Multiplication

• Latch-Up Free

• Asynchronous CLEAR Input

• Serial Load On Positive or Negative Strobes

• +5 V Supply Operation

• 3 V Version: MP75L43

• 4-Bit Parallel Version: MP7542

BENEFITS

• Compatible with Serial Addressing Systems

GENERAL DESCRIPTION

The MP7543 is a precision, 12-bit CMOS 4-quadrant multi-

plying Digital-to-Analog Converter designed for serial interface

applications.

The MP7543 consists of two 12-bit registers, control logic and

a 12-bit multiplying D/A converter. The input register (register A)

is a 12-bit serial-in parallel-out shift register. Serial data at the

SR1 pin is clocked into Register A on the leading or trailing edge

(user selected) of the strobe input, with the MSB loaded first.

Register B is a 12-bit parallel-in parallel-out register that follows

register A. The contents of register A are loaded into register B

under control of the Load inputs.

A CLEAR input is provided for the asynchronous resetting of

register B to all 0’s.

The MP7543 is manufactured using an advanced thin film

monolithic CMOS fabrication process. A unique decoding tech-

nique is utilized yielding excellent accuracy and stability. 12-bit

linearity is achieved without laser trimming.

The MP7543 reduces the additional linearity errors due to

output amplifier offset to only 330

the value of a standard R-2R CMOS DAC design approach.

SIMPLIFIED BLOCK DIAGRAM

12-Bit D/A Converter

DAC Register B

Register A

12-Bit Shift Register

Load

STB1

STB4

STB2

AGND

SRI

DGND

CLR

LD1

LD2

STB3