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LA2000M 데이터시트(PDF) 5 Page - Sanyo Semicon Device

부품명 LA2000M
상세설명  Audio Level Sensor
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제조업체  SANYO [Sanyo Semicon Device]
홈페이지  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA2000M 데이터시트(HTML) 5 Page - Sanyo Semicon Device

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2.
Individual pins and their operations
As shown above, when input level is raised and the pin 2 voltage reaches the VTH-H level of the comparator, pins 5 and 7 turn
over. (VIN = −45 dBm).
.
pin 5 is for driving plungers. When it is on the ‘‘L’’ side, pin 5 turns on and can draw current up to 50 mA maximum.
.
Pin 6 is a diode that prevents reverse voltages induced when the plunger is turned off from on.
.
Pin 7 functions in phase with pin 5 and can drive external transistors (such as for MUTE).
3.
Time delays and obtaining CRs
When input signals that have been applied at a level not less than −45 dBm are removed, discharging occurs through the CR
connected at pin 2, lowering pin 2 potential. A time delay is provided before the hysteresis comparator turns over.
E1
E0
=−
t
e
τ
E0 : Initial voltage
E1 : Threshold voltage
τ : Time constant
Accordingly,
t=−
τIn
E1
E0
E1/E0, within the IC, is 0.26. A desired time delay is obtained by an appropriate choice of
τ (τ =C
3R1). Therefore, the time delay
is obtained by the following formula:
t = 1.34
× C
3R1 (sec)
We recommend 150 k
Ω to 500 kΩ for R when determining CR.
4.
IC usage notes
.
Maximum ratings
When maximum ratings are surpassed, destruction or deterioration may result.
.
Interpin short circuits and reverse insertions
These cause destruction or deterioration of the IC: be careful when mounting on circuit board.
.
Voltage applied to pin 7 should never exceed pin 8 voltage.
.
The current flowing into pin 7 is to be 0.5 mA maximum.
Input signal level, VIN − dBm
LA2000M
No.4158-5/7


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