Improved Industry Standard Serial 12-Bit Multiplying DACs

The LTC7543/LTC8143 are serial-input 12-bit multiplying digital-to-analog converters (DACs). They are superior pin compatible replacements for the AD7543 and DAC-8143. Improvements include better accuracy, better stability over temperature and supply variations, lower sensitivity to output amplifier offset, tighter timing specifications and lower output capacitance.

An easy-to-use serial interface includes an asynchronous CLEAR input for systems requiring initialization to a known state. The LTC8143 has a serial data out put to allow daisy-chaining multiple DACs on a 3-wire interface bus.

These DACs are extremely versatile. They can be used for 2-quadrant and 4-quadrant multiplying, programmable gain and single supply applications, such as noninverting voltage output and biased or offset ground mode.

Parts are available in 16-pin PDIP and SO packages and are specified over the extended industrial temperature range, −40°C to 85°C.

Applications

* Process Control and Industrial Automation

* Remote Microprocessor-Controlled Systems

* Digitally Controlled Filters and Power Supplies

* Programmable Gain Amplifiers

* Automatic Test Equipment

* Improved Direct Replacement for AD7543 and DAC-8143

* Low Cost

* DNL and INL Over Temperature: ±0.5LSB

* Easy, Fast and Flexible Serial Interface

* Daisy-Chain 3-Wire Interface for Multiple DAC Systems (LTC8143)

* 1LSB Maximum Gain Error Over Temperature Eliminates Adjustment

* Asynchronous Clear Input for Initialization

* Four-Quadrant Multiplication

* Low Power Consumption

* 16-Pin PDIP and SO Packages