LA2000M View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LA2000M

Audio Level Sensor

SANYO -> Panasonic 

2. Individual pins and their operations

LA2000M

Input signal level, VIN − dBm

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

t

E0 = − eτ

Accordingly,

E1

t = −τIn

E0

E0 : Initial voltage

E1 : Threshold voltage

τ : Time constant

E1/E0, within the IC, is 0.26. A desired time delay is obtained by an appropriate choice of τ (τ = C3R1). Therefore, the time delay

is obtained by the following formula:

t = 1.34 × C3R1 (sec)

We recommend 150 kΩ 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.

No.4158-5/7

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