TSH512

General description

Doc ID 8120 Rev 7

23/31

The monostable holds the TSH512 in transmit mode during a delay fixed by the value of

Note that the VOX function is activated when the audio signal enters the first transmitter

TX1.

When the application needs a permanent transmission, it is possible to inhibit the VOX

function, by removing the Ctrig capacitor and connecting pin 29 to ground.

As soon as the TSH512 is powered-on, the internal reset circuitry sets the VOX-MUTE to

high state to enable transmission. The transmission remains during the monostable timing

and continues if an audio signal triggers the monostable.

Figure 31.

VOX state at power-on

VOX

DELAY

1.4V

5

μA

------------

⎝⎠

⎛⎞

C

trig

⋅

=

time

VOX -MUTE

POWER SUPPLY

on

off

VOX Delay

(Ctrig)

0

1

high state if retriggered by audio