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ISL21080CIH312Z-TK Datenblatt(PDF) 8 Page - Intersil Corporation

Teilenummer ISL21080CIH312Z-TK
Bauteilbeschribung  300nA NanoPower Voltage References
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Hersteller  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL21080CIH312Z-TK Datenblatt(HTML) 8 Page - Intersil Corporation

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FN6934.0
July 28, 2009
band increases due to instability of the very low power
amplifier with a 0.1µF capacitance load. For load
capacitances above 0.001µF, the noise reduction network
shown in Figure 20 is recommended. This network reduces
noise significantly over the full bandwidth. As shown in
Figure 19, noise is reduced to less than 40µVP-P from 1Hz
to 1MHz using this network with a 0.01µF capacitor and a
2k
Ω resistor in series with a 10µF capacitor.
Turn-On Time
The ISL21080 devices have ultra-low supply current and
thus, the time to bias-up internal circuitry to final values will
be longer than with higher power references. Normal turn-on
time is typically 7ms. This is shown in Figure 18. Since
devices can vary in supply current down to >300nA, turn-on
time can last up to about 12ms. Care should be taken in
system design to include this delay before measurements or
conversions are started.
Temperature Coefficient
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, (VHIGH – VLOW), and divide by the temperature
extremes of measurement (THIGH –TLOW). The result is
divided by the nominal reference voltage (at T = +25°C) and
multiplied by 106 to yield ppm/°C. This is the “Box” method for
specifying temperature coefficient.
CL = 0
CL = 0.001µF
CL = 0.1µF
CL = 0.01µF AND 10µF + 2k
Ω
400
350
300
250
200
150
100
50
0
1
10
100
1k
10k
100k
FIGURE 19. NOISE REDUCTION
VIN = 3.0V
VIN
VO
GND
ISL21080
0.01µF
10µF
2k
Ω
0.1µF
10µF
FIGURE 20. NOISE REDUCTION NETWORK
Typical Application Circuits
FIGURE 21. PRECISION 2.5V 50mA REFERENCE
VIN = 3.0V
2N2905
2.5V/50mA
0.001µF
VIN
VOUT
GND
ISL21080
R = 200
Ω
ISL21080


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