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ISL21007DFB812Z データシート(PDF) 11 Page - Intersil Corporation

部品番号 ISL21007DFB812Z
部品情報  Precision, Low Noise FGA??Voltage References
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メーカー  INTERSIL [Intersil Corporation]
ホームページ  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL21007DFB812Z データシート(HTML) 11 Page - Intersil Corporation

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11
FN6326.1
April 12, 2007
0.01µF value can be increased for better load transient
response with little sacrifice in output stability.
Turn-On Time
The ISL21007 devices have 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 120µs. This is shown in Figure 10. Circuit design
must take this into account when looking at power up delays
or sequencing.
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.
Output Voltage Adjustment
The output voltage can be adjusted up or down by 2.5% by
placing a potentiometer from Vout to ground, and connecting
the wiper to the TRIM pin. The TRIM input is high impedance,
so no series resistance is needed. The resistor in the
potentiometer should be a low tempco (<50ppm/°C) and the
resulting voltage divider should have very low tempco
<5ppm/°C. A digital potentiometer such as the ISL95810
provides a low tempco resistance and excellent resistor and
tempco matching for trim applications.
VIN = 3.0V
VIN
VO
GND
ISL21007
0.01µF
10µF
2k
Ω
0.1µF
10µF
FIGURE 28. HANDLING HIGH LOAD CAPACITANCE
ISL21007


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