Document
Preliminary Technical Data
Dual Low Power CMOS Analog Front End with DSP Microcomputer AD5744
FEATURES
GENERAL DESCRIPTION
Complete quad, 14-bit digital-to-analog
The AD5744 is a quad, 14-bit, serial input, bipolar voltage
converters (DACs)
output digital-to-analog converter that operates from supply
Programmable output range: ±10 V, ±10.2564 V, or ±10.5263 V
voltages of ±11.4 V up to ±16.5 V. Nominal full-scale output
±1 LSB max INL error, ±1 LSB max DNL error
range is ±10 V. The AD5744 provides integrated output
Low noise: 60 nV/√Hz
amplifiers, reference buffers and proprietary power-up/power-
Settling time: 10 μs max Integrated reference buffers Output control during power-up/brownout Programmable short-circuit protection Simultaneous updating via LDAC
E Asynchronous CLR to zero code
Digital gain adjust Logic output control pins
T DSP-/microcontroller-compatible serial interface
Temperature range: −40°C to +85°C iCMOS™ process technology1
E APPLICATIONS
Industrial automation Open-/closed-loop servo control
L Process control
Data acquisition systems Automatic test equipment Automotive test and measurement
OBSO High accuracy instrumentation
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 openloop 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. AD5744R AD5764
AD5764R
Description
AD5744 with Internal voltage reference
Complete Quad, 16-Bit, High Accuracy, Serial Input, Bipolar Voltage Output DACs
AD5764 with internal voltage reference
1 For analog systems designers within industrial/instrumentation equipment 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.
Rev. PrE
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AD5744
Preliminary Technical Data
TABLE OF CONTENTS
Features .............................................................................................. 1
Transfer Function....................................................................... 22
Applications....................................................................................... 1
Asynchronous Clear (CLR)....................................................... 22
General Description ......................................................................... 1
Function Register ....................................................................... 23
Revision History ............................................................................... 2
Data Register............................................................................... 24
Functional Block Diagram .............................................................. 3
Coarse Gain Register ................................................................. 24
Specifications..................................................................................... 4
Fine Gain Register ...................................................................... 24
AC Performance Characteristic...................................................... 6
Timing Characteristics..................................................................... 7
Absolute Maximum.