12-Bit Serial Input Multiplying CMOS

Digital-to-Analog Converter

DAC8043

Rev. E

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FEATURES

12-bit accuracy in an 8-lead PDIP and SOIC package

Fast serial data input

Double data buffers

Low ±½ LSB maximum INL and ±1 LSB maximum DNL

Maximum gain error: 2 LSB

Low ±5 ppm/°C maximum tempco

ESD resistant

Low cost

Available in die form

APPLICATIONS

Autocalibration systems

Process control and industrial automation

Programmable amplifiers and attenuators

Digitally controlled filters

FUNCTIONAL BLOCK DIAGRAM

12-BIT DAC

12-BIT

DAC REGISTER

12-BIT

SHIFT REGISTER

12

12

DAC8043

LD

CLK

SRI

GND

Figure 1.

GENERAL DESCRIPTION

The DAC8043 is a high accuracy 12-bit CMOS multiplying

DAC in a space-saving 8-lead PDIP package. Featuring serial

data input, double buffering, and excellent analog performance,

the DAC8043 is ideal for applications where PC board space is

at a premium. In addition, improved linearity and gain error

performance permit reduced parts count through the elimination

of trimming components. Separate input clock and load DAC

control lines allow full user control of data loading and analog

output.

The circuit consists of a 12-bit serial-in, parallel-out shift register,

a 12-bit DAC register, a 12-bit CMOS DAC, and control logic.

Serial data is clocked into the input register on the rising edge

of the CLK pulse. When the new data word has been clocked

in, it is loaded into the DAC register with the LD input pin.

Data in the DAC register is converted to an output current by

the digital-to-analog converter (DAC).

The fast interface timing of the DAC8043 may reduce timing

design considerations while minimizing microprocessor wait

states. For applications requiring an asynchronous clear function

or more versatile microprocessor interface logic, refer to the

AD5443.

Operating from a single 5 V power supply, the DAC8043 is the

ideal low power, small size, high performance solution to many

application problems. It is available in a PDIP package that is

compatible with auto-insertion equipment. There is also a

16-lead SOIC package available.