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LM1815 データシート(PDF) 9 Page - Texas Instruments

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部品番号 LM1815
部品情報  LM1815 Adaptive Variable Reluctance Sensor Amplifier
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ホームページ  http://www.ti.com
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LM1815
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SNOSBU8F – SEPTEMBER 2000 – REVISED MARCH 2013
MODE 1, PIN 5 OPEN
The adaptive mode is selected by leaving device pin 5 open circuit. For input signals of less than ±135mV (i.e.
270 mVp-p) and greater than typically ±75mV (i.e. 150mVp-p), the input arming threshold is typically at 45mV.
Under these conditions the input signal must first cross the 45mV threshold in the positive direction to arm the
zero crossing detector, and then cross zero in the negative direction to trigger it.
If the signal is less than 30mV peak (minimum rating in Electrical Characteristics), the one shot is ensured to not
trigger.
Input signals of greater than ±230mV (i.e. 460 mVp-p) will cause the arming threshold to track at 80% of the
peak input voltage. A peak detector capacitor at device pin 7 stores a value relative to the positive input peaks to
establish the arming threshold. Input signals must exceed this threshold in the positive direction to arm the zero
crossing detector, which can then be triggered by a negative-going zero crossing.
The peak detector tracks rapidly as the input signal amplitude increases, and decays by virtue of the resistor
connected externally at pin 7 track decreases in the input signal.
If the input signal amplitude falls faster than the voltage stored on the peak detector capacitor there may be a
loss of output signal until the capacitor voltage has decayed to an appropriate level.
Note that since the input voltage is clamped, the waveform observed at pin 3 is not identical to the waveform
observed at the variable reluctance sensor. Similarly, the voltage stored at pin 7 is not identical to the peak
voltage appearing at pin 3.
MODE 2, PIN 5 CONNECTED TO V+
The input arming threshold is fixed at 200mV minimum when device pin 5 is connected to the positive supply.
The chip has no output for signals of less than ±200 mV (i.e. 400mVp-p) and triggers on the next negative-going
zero crossing when the arming threshold is has been exceeded.
MODE 3, PIN 5 GROUNDED
With pin 5 grounded, the input arming threshold is set to 0V, ±25mV maximum. Positive-going zero crossings
arm the chip, and the next negative-going zero crossing triggers it. This is the very basic form of zero-crossing
detection.
ONE SHOT TIMING
The one shot timing is set by a resistor and capacitor connected to pin 14. The recommended maximum resistor
value is 150kohms. The capacitor value can be changed as needed, as long as the capacitor type does not
present any signfigant leakage that would adversely affect the RC time constant.
The output pulse width is:
pulse width = 0.673 x R x C
(1)
For a given One Shot pulse width, the recommended maximum input signal frequency is:
Fin(max) = 1/(1.346 x R x C)
(2)
In the application example shown in Figure 17 (R=150kohms, C=0.001µF) the recommended maximum input
frequency will typically be 5kHz. Operating with input frequencies above the recommended Fin (max) value may
result in unreliable performance of the One Shot circuitry. For those applications where the One Shot circuit is
not required, device pin 14 can be tied directly to Ground.
LOGIC INPUTS
In some systems it is necessary to externally generate pulses, such as during stall conditions when the variable
reluctance sensor has no output. External pulse inputs at pin 9 are gated through to pin 10 when Input Select
(pin 11) is pulled high. Pin 12 is a direct output for the one shot and is unaffected by the status of pin 11.
Input/output pins 9, 11, 10, and 12 are all CMOS logic compatible. In addition, pins 9, 11, and 12 are TTL
compatible. Pin 10 is not ensured to drive a TTL load.
Pins 1, 4, 6 and 13 have no internal connections and can be grounded.
Copyright © 2000–2013, Texas Instruments Incorporated
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