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PDF ( 数据手册 , 数据表 ) DAC715UB

零件编号 DAC715UB
描述 16-BIT DIGITAL-TO-ANALOG CONVERTER with 16-Bit Bus Interface
制造商 Burr-Brown Corporation
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DAC715UB 数据手册, 描述, 功能
®
FPODAC715
DAC715
DAC715
16-BIT DIGITAL-TO-ANALOG CONVERTER
with 16-Bit Bus Interface
FEATURES
q HIGH-SPEED 16-BIT PARALLEL DOUBLE-
BUFFERED INTERFACE
q VOLTAGE OUTPUT: 0 to +10V
q 13-, 14-, 15-BIT LINEARITY GRADES
q 16-BIT MONOTONIC OVER
TEMPERATURE (L GRADE)
q POWER DISSIPATION: 600mW max
q GAIN AND OFFSET ADJUST: Convenient
for Auto-Cal D/A Converters
q 28-LEAD DIP AND SOIC PACKAGES
DESCRIPTION
The DAC715 is a complete monolithic digital-to-
analog converter including a +10V temperature com-
pensated reference, current-to-voltage amplifier, 16-bit
parallel interface that is double buffered, and an asyn-
chronous clear function which immediately sets the
output voltage to one-half of full-scale.
The output voltage range is 0 to +10V while operating
from ±12V or ±15V supplies. The gain and bipolar
offset adjustments are designed so that they can be set
via external potentiometers or external D/A converters.
The output amplifier is protected against short circuit to
ground.
The 28-pin DAC715 is available in a 0.3" plastic DIP
and wide-body plastic SOIC package. The DAC715P,
U, PB, and UB are specified over the –40°C to +85°C
temperature range while the DAC715PK, UK, PL, and
UL are specified over the 0°C to +70°C range.
A1
A0
WR
CLR
Reference
Circuit
D0 D15
Input Latch
16
D/A Latch
16
16-Bit D/A Converter
VOUT
Gain Adjust
VREF OUT
+10V
Offset Adjust
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1995 Burr-Brown Corporation
PDS-1306D
Printed in U.S.A. July, 1997







DAC715UB pdf, 数据表
DAC715 CALIBRATION VALUES
1 LEAST SIGNIFICANT BIT = 152µV
DIGITAL INPUT CODE
BINARY TWO’S
COMPLEMENT, BTC
ANALOG
OUTPUT
(V)
DESCRIPTION
7FFFH
|
4000H
|
0001H
9.999847
7.5
5.000152
Full Scale –1LSB
3/4 Scale
Half Scale + 1LSB
0000H
5 Half Scale
FFFFH
|
C000H
|
8000H
4.999847
2.5
0
Half Scale – 1LSB
1/4 Scale
Zero
TABLE I. Digital Input and Analog Output Voltage Calibra-
tion Values.
+12V to +15V
–12V to –15V
+
0.01µF
0.01µF +
1 DCOM
2 ACOM
3 VOUT
4
5 VREF OUT
6
7 +VCC
8 –VCC
9
10
11
12
28
27
26
25
24
23
22
21
20
19
18
17
Gain Adjustment
Apply the digital input that gives the maximum positive
voltage output. Adjust the gain potentiometer or the gain
adjust D/A converter for this positive full scale voltage.
13
14
FIGURE 4. Power Supply Connections.
16
15
INSTALLATION
GENERAL CONSIDERATIONS
Due to the high-accuracy of the DAC715, system design
problems such as grounding and contact resistance become
very important. A 16-bit converter with a 10V full-scale
range has a 1LSB value of 152µV. With a load current of
5mA, series wiring and connector resistance of only 60m
will cause a voltage drop of 300µV. To understand what this
means in terms of a system layout, the resistivity of a typical
1 ounce copper-clad printed circuit board is 1/2 mper
square. For a 5mA load, a 10 milliinch wide printed circuit
conductor 60 milliinches long will result in a voltage drop of
150µV.
The analog output of DAC715 has an LSB size of 152µV
(–96dB). The noise floor of the D/A must remain below this
level in the frequency range of interest. The DAC715’s noise
spectral density (which includes the noise contributed by the
internal reference) is shown in the Typical Performance
Curves section.
well as at +VCC. The capacitors should be located close to the
package.
The DAC715 has separate ANALOG COMMON and DIGI-
TAL COMMON pins. The current through DCOM is mostly
switching transients and are up to 1mA peak in amplitude.
The current through ACOM is typically 5µA for all codes.
Use separate analog and digital ground planes with a single
interconnection point to minimize ground loops. The analog
pins are located adjacent to each other to help isolate analog
from digital signals. Analog signals should be routed as far
as possible from digital signals and should cross them at
right angles. A solid analog ground plane around the D/A
package, as well as under it in the vicinity of the analog and
power supply pins, will isolate the D/A from switching
currents. It is recommended that DCOM and ACOM be
connected directly to the ground planes under the package.
If several DAC715s are used or if DAC715 shares supplies
with other components, connecting the ACOM and DCOM
lines together once at the power supplies rather than at each
chip may give better results.
Wiring to high-resolution D/A converters should be routed
to provide optimum isolation from sources of RFI and EMI.
The key to elimination of RF radiation or pickup is small
loop area. Signal leads and their return conductors should be
kept close together such that they present a small capture
LOAD CONNECTIONS
Since the reference point for VOUT and VREF OUT is the ACOM
pin, it is important to connect the D/A converter load
directly to the ACOM pin. Refer to Figure 5.
cross-section for any external field. Wire-wrap construction
is not recommended.
Lead and contact resistances are represented by R1 through
R3. As long as the load resistance RL is constant, R1 simply
introduces a gain error and can be removed by gain adjust-
POWER SUPPLY AND
REFERENCE CONNECTIONS
ment of the D/A or system-wide gain calibration. R2 is part
of RL if the output voltage is sensed at ACOM.
Power supply decoupling capacitors should be added as
shown in Figure 4. Best performance occurs using a 1 to
10µF tantalum capacitor at –VCC. Applications with less
critical settling time may be able to use 0.01µF at –VCC as
In some applications it is impractical to return the load to the
ACOM pin of the D/A converter. Sensing the output voltage
at the SYSTEM GROUND point is reasonable, because
there is no change in DAC715 ACOM current, provided that
®
DAC715
8














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