AD5744_15 Datasheet, PDF (1/32 Pages) Analog Devices – Dual Low Power CMOS Analog Front End with DSP Microcomputer

Preliminary Technical Data
Dual Low Power CMOS Analog Front End
with DSP Microcomputer
AD5744
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.
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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