Dual Low Power CMOS Analog Front End

with DSP Microcomputer

Preliminary Technical Data

AD5744

Rev. PrE

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FEATURES

Complete quad, 14-bit digital-to-analog

converters (DACs)

Programmable output range: ±10 V, ±10.2564 V,

or ±10.5263 V

±1 LSB max INL error, ±1 LSB max DNL error

Low noise: 60 nV/√Hz

Settling time: 10 μs max

Integrated reference buffers

Output control during power-up/brownout

Programmable short-circuit protection

Simultaneous updating via LDAC

Asynchronous CLR to zero code

Digital gain adjust

Logic output control pins

DSP-/microcontroller-compatible serial interface

Temperature range: −40°C to +85°C

iCMOS™ process technology1

APPLICATIONS

Industrial automation

Open-/closed-loop servo control

Process control

Data acquisition systems

Automatic test equipment

Automotive test and measurement

High accuracy instrumentation

GENERAL DESCRIPTION

The AD5744 is a quad, 14-bit, serial input, bipolar voltage

output digital-to-analog converter that operates from supply

voltages of ±11.4 V up to ±16.5 V. Nominal full-scale output

range is ±10 V. The AD5744 provides integrated output

amplifiers, reference buffers and proprietary power-up/power-

down control circuitry. The part also features a digital I/O port,

which is programmed via the serial interface. The AD5744

incorporates digital gain adjust registers per channel.

The AD5744 is a high performance converter that offers

guaranteed monotonicity, integral nonlinearity (INL) of ±1 LSB,

low noise, and 10 μs settling time. During power-up (when the

supply voltages are changing), VOUT is clamped to 0 V via a

low impedance path.

The AD5744 uses a serial interface that operates at clock rates of

up to 30 MHz and is compatible with DSP and microcontroller

interface standards. Double buffering allows the simultaneous

updating of all DACs. The input coding is programmable to

either twos complement or offset binary formats. The

asynchronous clear function clears all DAC registers to either

bipolar zero or zero scale depending on the coding used. The

AD5744 is ideal for both closed-loop servo control and open-

loop control applications. The AD5744 is available in a 32-lead

TQFP, and offers guaranteed specifications over the −40°C to

+85°C industrial temperature range. See Figure 1, the functional

block diagram.

Table 1. Related Devices

Part No.

Description

AD5744R

AD5744 with Internal voltage

reference

AD5764

Complete Quad, 16-Bit, High

Accuracy, Serial Input, Bipolar

Voltage Output DACs

AD5764R

AD5764 with internal voltage

reference

OEMs who need high performance ICs at higher voltage levels, iCMOS is a

technology platform that enables the development of analog ICs capable of

30 V and operating at ±15 V supplies while allowing dramatic reductions in

power consumption and package size, and increased AC and DC

performance.