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AD581
APPLYING THE AD581
The AD581 is easy to use in virtually all precision reference
V+
applications. The three pins are simply: primary supply, ground,
R40
R41
and output, with the case grounded. No external components
are required even for high precision applications; the degree of
desired absolute accuracy is achieved simply by selecting the
Q10
C51
C52
Q12
Q11
Q20
Q8
Q15
Q7
R42
required device grade. The AD581 requires less than 1 mA quies-
Q6
Q14
R34
10V
cent current from an operating supply range of 13 V to 30 V.
13V TO 30V
Q16
Q13
R37
Q5
+V S
C50
R33
R32
R35
AD581
V OUT
10V
Q3
Q4
GND
Q2
Q1
Figure 2. Pin Configuration (Bottom View)
R39
R30
R31
R36
V–
An external fine trim may be desired to set the output level to
exactly 10.000 V within less than a millivolt (calibrated to a
main system reference). System calibration may also require a
reference slightly different from 10.00 V. In either case, the
optional trim circuit shown in Figure 3 can offset the output by
up to ±30 mV (with the 22 Ω resistor), if needed, with minimal
effect on other device characteristics.
+15V
Figure 4. Simplified Schematic
VOLTAGE VARIATION vs. TEMPERATURE
Some confusion exists in the area of defining and specifying
reference voltage error over temperature. Historically, references
have been characterized using a maximum deviation per degree
Celsius; that is, 10 ppm/°C. However, because of nonlinearities
in temperature characteristics, which originated in standard
R
22 ?
12 ?
3.9 ?
TRIM
RANGE
±30mV
±10mV
±5mV
MAX
Δ TCR
3.5ppm/°C
2.0ppm/°C
0.6ppm/°C
+V S
AD581
V OUT
+10V
Zener references (such as S-type characteristics) manufacturers
opt for the maximum limit error band approach to specify devices.
This technique involves measurement of the output at three,
five, or more different temperatures to guarantee that the output
voltage falls within the given error band. The temperature charac-
–15V
6.8k ?
10k ?
4.3k ?
GND
R
teristic of the AD581 consistently follows the S-curve shown in
the error band over the specified temperature range.
10.005
Figure 3. Optional Fine Trim Configuration
10.000
9.995
–55 –50 –40 –30 –20 –10 0
10 20 30 40 50 60 70 80 90 100 110 120 125
TEMPERATURE (°C)
Figure 5. Typical Temperature Characteristic
Rev. C | Page 6 of 12
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