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ISL60002
3.5
Temperature Coefficient
3.0
2.5
2.0
1.5
1.0
0.5
V IN
UNIT 3
UNIT 1
UNIT 2
The limits stated for temperature coefficient (tempco) are
governed by the method of measurement. The overwhelming
standard for specifying the temperature drift of a reference is to
measure the reference voltage at two temperatures, take the
total variation, (V HIGH – V LOW ), and divide by the temperature
extremes of measurement (T HIGH – T LOW ). The result is divided
by the nominal reference voltage (at T = +25°C) and multiplied
by 10 6 to yield ppm/°C. This is the “Box” method for specifying
temperature coefficient.
0
-1
1
3
5
7
9
11
TIME (ms)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
UNIT 3
V IN
UNIT 1
UNIT 2
0
-1
1
3
5
7
9
11
TIME (ms)
FIGURE 120. TURN-ON TIME
Typical Application Circuits
V IN = 3.0V
R = 200 Ω
2N2905
V IN
ISL60002 V OUT
V OUT = 2.50V
GND
0.001μF
2.5V/50mA
FIGURE 121. PRECISION 2.5V 50mA REFERENCE
36
FN8082.19
January 16, 2014
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