TSH512

6/19

MULTIMEDIA APPLICATION: HEADSET SIDE

The TSH512 is used in mono to transmit the signal of the Electret Condenser Microphone of the headset.

The circuit is supplied by batteries and the VOX function switches off the output stages to spare energy.

The usual working frequency is 1.7 MHz for infrared mono operation.

MULTIMEDIA APPLICATION: COMPUTER SIDE

In multimedia application, the TSH512 transmits the HiFi stereo from the PC to the headset.

TSH512

LNA + ALC

LNA + ALC

MIC. BIAS

MIC. BIAS

TX2

TX1

VOX

SBY

buffer1

buffer2

photodiode

Vcc

LED

Vcc

Audio

amp2

LNA

2.3 MHz

Band-pass

TSH511

HiFi stereo from the PC:

2x 20 mW /16

Ω

1.7 MHz

Band-pass

Voicetransmittedto thePC

Microphone Tx:

1.7 MHz

carrier

Stereo Rx:

2.3 & 2.8 MHz

filter

1.7 MHz

reject

1.7 MHz

reject

2.8 MHz

Band-pass

TSH511 & 512 supply:

2.3 to 5.5V, 25 mA

Audio

amp1

filter

filter

filter

filter

RX2

RX1

TSH512

LNA + ALC

LNA + ALC

MIC. BIAS

MIC. BIAS

TX2

TX1

VOX

SBY

buffer1

buffer2

photodiode

Vcc

LED

Vcc

Audio

amp2

LNA

2.3 MHz

Band-pass

TSH511

HiFi stereo from the PC:

2x 20 mW /16

Ω

1.7 MHz

Band-pass

Voicetransmittedto thePC

Microphone Tx:

1.7 MHz

carrier

Stereo Rx:

2.3 & 2.8 MHz

filter

1.7 MHz

reject

1.7 MHz

reject

2.8 MHz

Band-pass

TSH511 & 512 supply:

2.3 to 5.5V, 25 mA

Audio

amp1

filter

filter

filter

filter

RX2

RX1

LNA + ALC

LNA + ALC

SBY

buffer1

buffer2

LED

photodiode

TSH511 & 512 supply:

2.3 to 5.5V, 24 mA

TSH512

Audio

amp1

Audio

amp2

LNA

RX2

RX1

filter

TSH511

Vcc

1.7 MHz

Band-pass

HiFi stereo Tx:

2.3 & 2.8 MHz

mono Rx:

1.7 MHz

Voice from the headset microphone

HiFi stereo

VOX

TX2

TX1

LNA + ALC

LNA + ALC

SBY

buffer1

buffer2

LED

photodiode

TSH511 & 512 supply:

2.3 to 5.5V, 24 mA

TSH512

Audio

amp1

Audio

amp2

LNA

RX2

RX1

filter

TSH511

Vcc

1.7 MHz

Band-pass

HiFi stereo Tx:

2.3 & 2.8 MHz

mono Rx:

1.7 MHz

Voice from the headset microphone

HiFi stereo

VOX

TX2

TX1