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PDF ( 数据手册 , 数据表 ) DAC80

零件编号 DAC80
描述 Monolithic 12-Bit DIGITAL-TO-ANALOG CONVERTERS
制造商 Burr-Brown Corporation
LOGO Burr-Brown Corporation LOGO 


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DAC80 数据手册, 描述, 功能
® DAC80
FPO
FPO 41%
DAC80P
Monolithic 12-Bit
DIGITAL-TO-ANALOG CONVERTERS
FEATURES
q INDUSTRY STANDARD PINOUT
q FULL ±10V SWING WITH VCC = ±12VDC
q DIGITAL INPUTS ARE TTL- AND
CMOS-COMPATIBLE
q GUARANTEED SPECIFICATIONS WITH
±12V AND ±15V SUPPLIES
q ±1/2LSB MAXIMUM NONLINEARITY:
0°C to +70°C
q SETTLING TIME: 4µs max to ±0.01% of
Full Scale
q GUARANTEED MONOTONICITY:
0°C to +70°C
q TWO PACKAGE OPTIONS: Hermetic side-
brazed ceramic and low-cost molded
plastic
resistors, as well as low integral and differential lin-
earity errors. Innovative circuit design enables the
DAC80 to operate at supply voltages as low as ±11.4V
with no loss in performance or accuracy over any
range of output voltage. The lower power dissipation
of this 118-mil by 121-mil chip results in higher
reliability and greater long term stability.
Burr-Brown has further enhanced the reliability of the
monolithic DAC80 by offering a hermetic, side-brazed,
ceramic package. In addition, ease of use has been
enhanced by eliminating the need for a +5V logic
power supply.
For applications requiring both reliability and low
cost, the DAC80P in a molded plastic package offers
the same electrical performance over temperature as
the ceramic model. The DAC80P is available with
voltage output only.
For designs that require a wider temperature range, see
Burr-Brown models DAC85H and DAC87H.
DESCRIPTION
This monolithic digital-to-analog converter is pin-for-
pin equivalent to the industry standard DAC80 first
introduced by Burr-Brown. Its single-chip design in-
cludes the output amplifier and provides a highly
stable reference capable of supplying up to 2.5mA to
an external load without degradation of D/A perfor-
mance.
This converter uses proven circuit techniques to pro-
vide accurate and reliable performance over tempera-
ture and power supply variations. The use of a buried
zener diode as the basis for the internal reference
contributes to the high stability and low noise of the
device. Advanced methods of laser trimming result in
precision output current and output amplifier feedback
12-Bit
Resistor
Ladder
Network
and
Current
Switches
Reference
Reference
Control
Circuit
Gain
Adjustment
Scaling
Network
Analog
Output
Offset
Adjustment
+ Supply
– Supply
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 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1986 Burr-Brown Corporation
PDS-643F
Printed in U.S.A. July, 1993







DAC80 pdf, 数据表
Output
Range
±10
±5
±2.5V
0 to +10V
0 to +5V
Digital
Connect Connect Connect Connect
Input Codes Pin 15 to Pin 17 to Pin 19 to Pin 16 to
COB or CTC
19
20
15
COB or CTC
18
20
NC
COB or CTC
18
20
20
CSB
18 21 NC
CSB
18 21 20
24
24
24
24
24
TABLE III. Output Voltage Range Connections for Voltage
Models.
19 20V Range
5k18
10V Range
5k
15
IOUT
0 to
2mA
6.6k
OPA604(1)
A
VOUT
CURRENT OUTPUT MODELS
The resistive scaling network and equivalent output circuit
of the current model differ from the voltage model and are
shown in Figures 7 and 8.
21
NOTE: (1) For fast settling.
FIGURE 9. External Op-Amp—Using Internal Feedback
Resistors.
Reference Input
16
18
15
To Reference Control Circuit
6.3k(1)
17
3k(1)
2k(1)
19
5k(1)
20
NOTE: (1) Resistor Tolerances: ±2% max.
FIGURE 7. Internal Scaling Resistors.
the current output model DAC80 provides output voltage
ranges the same as the voltage model DAC80. To obtain the
desired output voltage range when connecting an external op
amp, refer to Table IV.
Output
Range
±10V
±5V
±2.5V
0 to +10V
0 to +5V
Digital
Input Codes
COB or CTC
COB or CTC
COB or CTC
CSB
CSB
Connect Connect Connect
A to Pin 17 to Pin 19 to
19 15
A
18 15 NC
18 15
15
18 21 NC
18 21 15
Connect
Pin 16 to
24
24
24
24
24
TABLE IV. Voltage Range of Current Output.
+
0 to
2mA
To
Reference
Control
Circuit
6.3V
I
24 Reference Out
17 Bipolar Offset
6.3k
16 Reference Input
15 IOUT
RO
6.6k
21 Common
FIGURE 8. Current Output Model Equivalent Output Circuit.
Internal scaling resistors (Figure 7) are provided to scale an
external op amp or to configure load resistors for a voltage
output. These connections are described in the following
sections.
If the internal resistors are not used for voltage scaling,
external RL (or RF) resistors should have a TCR of
±25ppm/°C or less to minimize drift. This will typically add
±50ppm/°C plus the TCR of RL (or RF) to the total drift.
Driving An External Op Amp
The current output model DAC80 will drive the summing
junction of an op amp used as a current-to-voltage converter
to produce an output voltage. See Figure 9.
VOUT = IOUT x RF
where IOUT is the DAC80 output current and RF is the
feedback resistor. Using the internal feedback resistors of
®
DAC80/80P
Output Larger Than 20V Range
For output voltage ranges larger than ±10V, a high voltage
op amp may be employed with an external feedback resistor.
Use IOUT value of ±1mA for bipolar voltage ranges and
–2mA for unipolar voltage ranges. See Figure 10. Use
protection diodes when a high voltage op amp is used.
The feedback resistor, RF, should have a temperature coef-
ficient as low as possible. Using an external feedback
resistor, overall drift of the circuit increases due to the lack
of temperature tracking between RF and the internal scaling
resistor network. This will typically add 50ppm/°C plus RF
drift to total drift.
+
6.3k
24
17
6.3k
16
RF
I
0 to
2mA
6.6k
15
BB3582J(1)
VOUT
21
NOTE: (1) For output voltage swings up to 290V p-p.
FIGURE 10. External Op-Amp—Using External Feedback
Resistors.
8














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