2.

Individual pins and their operations

.

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

is obtained by the following formula:

t = 1.34

× C

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.

LA2000M

No.4158-5/7