TSH512 datasheet(23/31 Pages) STMICROELECTRONICS

Part #	TSH512

Description	Hi-fi stereo/mono infrared transmitter and stereo sub-carrier generator

PDF	31 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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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

CTRIG connected to pin 29.

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

μA

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

⎝⎠

⎛⎞

trig

⋅

time

VOX -MUTE

POWER SUPPLY

off

VOX Delay

(Ctrig)

high state if retriggered by audio

TSH512 Datasheet(PDF) 23 Page - STMicroelectronics