ad394td/883b Analog Devices, Inc., ad394td/883b Datasheet

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ad394td/883b

Manufacturer Part Number
ad394td/883b
Description
Dac 4-ch 12-bit 28-pin Cdip
Manufacturer
Analog Devices, Inc.
Datasheet

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Part Number:
AD394TD/883B
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ADI
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374
FEATURES
Four, complete, 12-bit CMOS DACs with buffer registers
Linearity error: ±1/2 LSB T
Factory-trimmed gain and offset
Precision output amplifiers for V
Full four-quadrant multiplication per DAC
Monoticity guaranteed over full temperature range
Fast settling: 15 µs maximum to ±1/2 LSB
Available in MIL-STD-883B
PRODUCT DESCRIPTION
The AD394 contains four 12-bit, high-speed, low power, voltage
output, multiplying digital-to-analog converters in a compact
28-pin hybrid package. The design is based on a proprietary,
latched, 12-bit, CMOS DAC chip, which reduces chip count and
provides high reliability. The AD394 is ideal for systems
requiring digital control of many analog voltages where board
space is at a premium and low power consumption is a neces-
sity. Such applications include automatic test equipment, process
controllers, and vector stroke displays.
The AD394 is laser-trimmed to ±1/2 LSB maximum differential
and integral linearity (AD394T) and full-scale accuracy of
±0.05 percent at 25°C. The high initial accuracy is possible
because of the use of precision, laser-trimmed, thin-film scaling
resistors.
The individual DAC registers are accessed by the CS1 through
CS4 control pins. These control signals allow any combination
of the DAC select matrix to occur (see Table 3). Once selected,
the DAC is loaded with a single 12-bit wide word. The 12-bit
parallel digital input interfaces to most 12- and 16-bit bus
systems.
The AD394 outputs (V
output range with positive-true offset binary input coding.
The AD394 is packaged in a 28-lead ceramic package and is
available for operation over a −55°C to +125°C temperature
range.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
REFIN
MIN
= 10 V) provide a ±10 V bipolar
, T
MAX
OUT
(AD394T)
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
6.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
The AD394 offers a dramatic reduction in printed circuit
board space in systems using multiple low power DACs.
Each DAC is independently addressable and provides
versatile control architecture for a simple interface to
microprocessors. All latch enable signals are level-
triggered.
The output voltage is trimmed to a full-scale accuracy of
±0.05%. Settling time to ±1/2 LSB is 15 µs maximum.
A maximum gain TC of 5 ppm/°C is achievable.
Two- or four-quadrant multiplication can be achieved
simply by applying the appropriate input voltage signal to
the selected DAC's reference (V
The AD394TD features guaranteed accuracy and linearity
over the −55°C to +125°C temperature range.
µP-Compatible Multiplying
Quad 12-Bit D/A Converter
Figure 1. Functional Block Diagram
© 2004 Analog Devices, Inc. All rights reserved.
REFIN
).
www.analog.com
AD394

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ad394td/883b Summary of contents

Page 1

... DAC's reference (V REFIN 6. The AD394TD features guaranteed accuracy and linearity over the −55°C to +125°C temperature range. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. AD394 ). www.analog.com ...

Page 2

AD394 TABLE OF CONTENTS Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Functional Block Diagram...................... 6 Theory of Operation ........................................................................ 7 Multiplying Mode......................................................................... 7 Data and Control Signal Format ................................................ 7 Timing............................................................................................ 8 REVISION HISTORY 9/04–Rev. ...

Page 3

... Digital-to-Analog Glitch Impulse Crosstalk 7 Digital Input (Static) 8 Reference POWER REQUIREMENTS 9 Supply Voltage Current (All Digital Inputs −V S Power Dissipation AD394TD and AD394TD/883B Min Typ 2.4 0 ±4 ±V REFIN 5 ±0.025 ±0.012 ±0.012 ±1/8 ±1/4 ±1/4 MONOTONICITY GUARANTEED ...

Page 4

... Reference crosstalk is defined as the change in any one output as a result of any other output being driven from V of varying the amplitude of the reference signal. 9 The AD394 can be used with supply voltages as low as ±11.4 V. See AD394TD and AD394TD/883B Min Typ 0.002 0.0025 −55 − ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating +V to DGND −0 + −V to DGND − +0 Digital Inputs (Pins 1-16) to DNGD −0 DGND ±25 ...

Page 6

AD394 PIN CONFIGURATION AND FUNCTIONAL BLOCK DIAGRAM Figure 3. Pin Configuration Figure 4. Functional Block Diagram (Bipolar) Rev Page ...

Page 7

THEORY OF OPERATION The AD394 quad DAC provides four-quadrant multiplication hybrid IC comprised of four, monolithic, 12-bit, CMOS, multiplying DACs and eight precision output amplifiers. Each of the four independent-buffered channels has an independent reference input capable ...

Page 8

AD394 TIMING The AD394 control signal timing is very straightforward. CS1 – CS4 must maintain a minimum pulse width of at least 400 ns for a desired operation to occur. When loading data from a bus into a 12-bit wide ...

Page 9

Figure 9. Use of Subtracter Amplifier to Preserve Accuracy OPERATION FROM ±12 V SUPPLIES The AD394 may be used with ±12 V ±5% power supplies if certain conditions are met. The most important limitation is the output swing available from ...

Page 10

AD394 8-Bit Processors The circuit of Figure 13 shows the general principles for connecting the AD394 to an 8-bit data bus. The 74LS244 buffers the data bus; its outputs are enabled when the DAC address appears on the address bus. ...

Page 11

OR’ed with LED indicators as shown. The test limits for each comparator are programmed by the AD394 V outputs. When the output of the device under testing is within the limits, both comparators are off and D1 lights. If the ...

Page 12

... Note: Squared Corner and Dot in Shaded Area Indicate Pin 1. ORDERING GUIDE Model Temperature Range AD394TD −55°C to +125°C AD394TD/883B −55°C to +125°C © 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 1.575 (40.01) MAX ...

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