MP7542 查看數據表（PDF） - Exar Corporation

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MP7542

5 V CMOS 4-Bit Input, 12-Bit Digital-to-Analog Converter

Exar Corporation 

FEATURES

• 12-Bit DAC with a 4-Bit Parallel Address for 4 & 8-Bit

Microprocessor or Microcontroller Interface

• Nonlinearity +1/2 LSB Tmin to Tmax

• Latch-Up Free

• Low Sensitivity to Output Amplifier VOS

• Low Output Capacitance

MP7542

5 V CMOS

4-Bit Input, 12-Bit

Digital-to-Analog Converter

• +5 V Supply Operation

• Low Power Consumption: 40mW Max.

• Low Cost

• Serial Version: MP7543

GENERAL DESCRIPTION

The MP7542 is a precision, 12-bit CMOS 4-quadrant multi-

plying Digital-to-Analog Converter designed for direct interface

to 4 and 8-bit microprocessors.

The MP7542 consists of three 4-bit registers, a 12-bit DAC

register, address decoding logic, and a 12-bit CMOS multiplying

DAC. Data is loaded into the data registers in three 4-bit nibbles

and subsequently transferred to the 12-bit DAC register. All data

loading or data transfer operations are identical to the WRITE

cycle of a static RAM. A CLEAR input allows the 12-bit DAC reg-

ister to be reset to all zeros.

The MP7542 is manufactured using advanced thin-film on

monolithic double metal CMOS fabrication process. A unique

decoding technique is utilized yielding excellent accuracy and

stability.

The MP7542 reduces the additional linearity errors due to

output amplifier offset to only 330µV per millivolt of offset versus

670 µV for the standard R-2R ladder CMOS DACs.

SIMPLIFIED BLOCK DIAGRAM

VREF

12-Bit Multiplying DAC

CLR

WR

CS

A0

A1

12-Bit DAC Register

Address

Decode

Logic

H-Byte

Data

Register

M-Byte

Data

Register

L-Byte

Data

Register

RFB

IOUT1

IOUT2

AGND

VDD

DGND

DB0 (LSB)

DB1

DB2

DB3 (MSB)

Rev. 2.00

1

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