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AD580
The consistent voltage versus temperature performance of a
typical AD580 is shown in Figure 7. Note that the characteristic
is quasi-parabolic, not the possible S type characteristics of
classical Zener references. This parabolic characteristic permits
a maximum output deviation specification over the device’s full
operating temperature range, rather than just at 3 to 5 discrete
temperatures.
2.51
2.50
1mV
100 μ V
10 μ V
2.49
MAXIMUM
VOLTAGE CHANGE
FROM 0 ° C TO 70 ° C
0
100
1k
10k
FREQUENCY (Hz)
100k
1M
Figure 9. Peak-to-Peak Output Noise vs. Frequency
2.48
2.47
2.46
–55
–30
0
25 50
75
100
125
TEMPERATURE ( ° C)
Figure 7. Typical AD580K Output Voltage vs. Temperature
The AD580M guarantees a maximum deviation of 1.75 mV
over the 0°C to 70°C temperature range. This can be shown to
be equivalent to 10 ppm/°C average maximum; i.e.,
× = 10 ppm / ° C max average
1 . 75 mV max
70 ° C
1
2 . 5 V
500 μ A
5V
Figure 10. Input Current vs. Input Voltage (Integral Loads)
The AD580 typically exhibits a variation of 1.5 mV over the
power supply range of 7 V to 30 V. Figure 8 is a plot of AD580
line rejection versus frequency.
NOISE PERFORMANCE
1 Hz (3 dB point) to a 3 dB high end shown on the horizontal
axis. Peak-to-peak noise from 1 Hz to 1 MHz is approximately
600 μV.
140
THE AD580 AS A CURRENT LIMITER
The AD580 represents an excellent alternative to current limiter
diodes that require factory selection to achieve a desired
current. This approach often results in temperature coefficients
of 1%/C. The AD580 approach is not limited to a specially
selected factory set current limit; it can be programmed from
1 mA to 10 mA with the insertion of a single external resistor.
The approximate temperature coefficient of current limit for the
AD580 used in this mode is 0.13%/°C for I LIM = 1 mA and
130
120
110
100
e = 23V p-p
E = 18.5V
AD580
k e OUT p-p
0.01%/°C for I LIM = 13 mA (see Figure 11). Figure 10 displays
the high output impedance of the AD580 used as a current
limiter for I LIM = 1, 2, 3, 4, and 5 mA.
90
80
70
60
50
40
E IN COMPOSITE (17V ≤ V IN ≤ 30V)
V+
AD580
OUTPUT
30
20
10
V–
2.5V
R
LOAD
i ?
2.5V
R
+ 1mA
0
10
100
1k
10k
100k
BOTTOM VIEW OF
2.5V PRECISION
LINE FREQUENCY (Hz)
Figure 8. AD580 Line Rejection Plot
Rev. B | Page 6 of 8
REFERENCE CIRCUIT
IN TO-52 CASE
Figure 11. A Two-Component Precision Current Limiter
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