AD394 Datasheet PDF - Analog Devices

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AD394
Analog Devices

Part Number AD394
Description uP-Compatible Multiplying Quad 12-Bit D/A Converter
Page 12 Pages


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µP-Compatible Multiplying
Quad 12-Bit D/A Converter
AD394
FEATURES
Four, complete, 12-bit CMOS DACs with buffer registers
Linearity error: ±1/2 LSB TMIN, TMAX (AD394T)
Factory-trimmed gain and offset
Precision output amplifiers for VOUT
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
Ooutput, multiplying digital-to-analog converters in a compact
B28-pin hybrid package. The design is based on a proprietary,
latched, 12-bit, CMOS DAC chip, which reduces chip count and
Sprovides high reliability. The AD394 is ideal for systems
Orequiring digital control of many analog voltages where board
space is at a premium and low power consumption is a neces-
Lsity. Such applications include automatic test equipment, process
Econtrollers, and vector stroke displays.
TEThe 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.
Figure 1. Functional Block Diagram
PRODUCT HIGHLIGHTS
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.
1. The AD394 offers a dramatic reduction in printed circuit
board space in systems using multiple low power DACs.
2. Each DAC is independently addressable and provides
versatile control architecture for a simple interface to
microprocessors. All latch enable signals are level-
triggered.
The AD394 outputs (VREFIN = 10 V) provide a ±10 V bipolar
output range with positive-true offset binary input coding.
3. The output voltage is trimmed to a full-scale accuracy of
±0.05%. Settling time to ±1/2 LSB is 15 µs maximum.
The AD394 is packaged in a 28-lead ceramic package and is
available for operation over a −55°C to +125°C temperature
range.
4. A maximum gain TC of 5 ppm/°C is achievable.
5. Two- or four-quadrant multiplication can be achieved
simply by applying the appropriate input voltage signal to
the selected DAC's reference (VREFIN).
6. The AD394TD features guaranteed accuracy and linearity
over the −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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.



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AD394
TABLE OF CONTENTS
Specifications..................................................................................... 3
Analog Circuit Details ..................................................................8
Absolute Maximum Ratings............................................................ 5
Operation From ±12 V Supplies..................................................9
ESD Caution.................................................................................. 5
Power Supply Decoupling ............................................................9
Pin Configuration and Functional Block Diagram...................... 6
Improving Full-Scale Stability .....................................................9
Theory of Operation ........................................................................ 7
Applications ...................................................................................9
Multiplying Mode......................................................................... 7
Applications ................................................................................ 10
Data and Control Signal Format ................................................ 7
Timing............................................................................................ 8
Package Outline .............................................................................. 12
Ordering Guide .......................................................................... 12
OREVISION HISTORY
B9/04–Rev. 0 Changed to Rev. A
SUpdated format....................................................................... Universal
ODeleted AD395 part................................................................ Universal
Change to Product Description...........................................................1
LChanges to Specifications table............................................................3
EDelete Figure 3 .......................................................................................4
Delete Figure 6 .......................................................................................5
TEChange to Theory of Operation section.............................................7
7/85–Initial Version: Revision 0
Rev. A | Page 2 of 12



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AD394
SPECIFICATIONS
Table 1. TA = 25°C, VREFIN = 10 V, VS = ±15 V, unless otherwise specified
AD394TD and AD394TD/883B1
Model
Min Typ
Max Units
DATA INPUTS (Pins 1-16)2
TTL or 5 V CMOS-Compatible
Input Voltage
Bit ON (Logic 1)
2.4
5.5 V
Bit OFF (Logic 0)
0
0.8 V
Input Current
±4 ±40 µA
RESOLUTION
12 Bits
OUTPUT
Voltage Range3
Current
STATIC ACCURACY
Gain Error
OOffset
Bipolar Zero
BIntegral Linearity Error5
SDifferential Linearity Error
TEMPERATURE PERFORMANCE
OGain Drift
LOffset Drift
EIntegrated Linearity Error5
TMIN to TMAX
TEDifferential Linearity Error
±VREFIN
5
V
mA
±0.025
±0.012
±0.012
±1/8
±1/4
±0.05
±0.025
±1/2
±1/2
% of FSR4
% of FSR
% of FSR
LSB
LSB
±5 ppm FSR/°C
±5 ppm FSR/°C
±1/4 ±1/2
MONOTONICITY GUARANTEED
LSB
OVER FULL TEMPERATURE RANGE
REFERENCE INPUTS
Input Resistance
5
25 kΩ
Voltage Range
−11
+11 V
DYNAMIC PERFORMACE
Setting Time (to ±1/2 LSB)
VPREFIN = 10 V, Change All Digital Inputs from 5.0 V
to 0 V
10 15 µs
VREFIN = 0 V to 5 V Step, All Digital Inputs = 0 V
Reference Feedthrough Error
Digital-to-Analog Glitch Impulse6
10
See Figure 2
250
15 µs
nV-s
Crosstalk
Digital Input (Static)7
Reference8
0.1 LSB
2.0 mV p-p
POWER REQUIREMENTS
Supply Voltage9
±13.5
±16.5
V
Current (All Digital Inputs 0 V or 5 V)
+VS
−VS
Power Dissipation
40 48 mA
18 28 mA
570 750 mW
Rev. A | Page 3 of 12



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AD394
Model
POWER SUPPLY GAIN SENSITIVITY
+VS
−VS
TEMPERATURE RANGE
Operating (Full Specifications)
T
Storage
AD394TD and AD394TD/883B1
Min Typ
Max Units
0.002
0.0025
%FS/%
%FS/%
−55 125 °C
−65 150 °C
1 The AD394 T grade is available to MIL-STD-883, Method 5008, Class B. See Analog Devices Military Catalog (1985) for proper part number and detail specification.
2 Timing specifications appear in Table 5 and Figure 6.
3 See the Theory of Operation section for code tables and graphs.
4 FSR means full-scale range and is equal to 20 V for a ±10 V bipolar range and 10 V for a 0 V to 10 V unipolar range.
5 Integral nonlinearity is a measure of the maximum deviation from a straight line passing through the endpoints of the DAC transfer function.
6 This is a measure of the amount of charge injected from the digital inputs to the analog outputs when the inputs change state. It is usually specified as the area of the
glitch in nVs and is measured with VREFIN = AGND.
7 Digital crosstalk is defined as the change in any one output’s steady state value as a result of any other output being driven from VOUTMIN to VOUTMAX into a 2kΩ load by
means of varying the digital input code.
O8 Reference crosstalk is defined as the change in any one output as a result of any other output being driven from VOUTMIN to VOUTMAX @10 kHz into a 2 kΩ load by means
of varying the amplitude of the reference signal.
BSOLETE9 The AD394 can be used with supply voltages as low as ±11.4 V. See Figure 10.
Rev. A | Page 4 of 12



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