SPX4040AS-2.5 データシートの表示（PDF） - Signal Processing Technologies
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SPX4040AS-2.5 Datasheet PDF : 9 Pages
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VIN
250Ω
fp = 100kHz
50Ω
TYPICAL PERFORMANCE CHARACTERISTICS
VOUT
IK
100
10
TA = 25 °C
IK =1 to 15mA
1.0
0.1
Figure 8. Test Circuit for Pulse Response
100
GND
0.01
1K
10K
100K
1M
10M
f Frequency (Hz)
Figure
9.
Dynamic
Output
Impedance
T
A
=
25°C,
IK = 1 to 15mA
10
VKA = 2.5V
1
0.1
0.01
-50
0
50
100
150
TA Ambient Temperature (°C)
Figure 10. Off State Leakage
APPLICATION INFORMATION
This device is designed for stable operation and
has no need of an external capacitor between
pins 4 and 8. The reference remains stable if a
bypass capacitor is used.
SOT-23
The SPX4040 in the SOT-23 package has a
parasitic Schottky diode between pin 3 and pin
1. Pin 1 of SOT-23 must float or be connected
to pin 3.
Conventional Shunt Regulator
In a conventional shunt regulator application
(see Figure 11), an external series resistor (R ) is
S
connected between the supply voltage and the
SPX4040. R determines the current that flows
S
through the load (IL) and the reference (IQ).
Since load current and supply voltage may vary,
R should be small enough to supply at least the
S
minimum acceptable I to the reference even
Q
when the supply voltage is at its minimum and
the load current is at its maximum value. When
the supply voltage is at its maximum and IL is at
its minimum, RS should be large enough so that
the current flowing through the SPX4040 is less
than 15mA.
RS is determined by the supply voltage (VS), the
load and operating current (IL and IQ), reference's
reverse breakdown voltage (VR).
RS = (VS-VR)/(IL+IQ)
Date: 1/19/05
SPX4040 Micropower 2.5V Shunt Voltage Reference
4
© Copyright 2005 Sipex Corporation
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