TSH512

5/19

INFRARED STEREO TRANSMITTER APPLICATION (ie: stereo headphone)

The HiFi stereo audio is amplified and level regulated by ALC. The carrier of each transmitter TX1 or TX2

of the TSH512 is modulated in FM and bufferized to attack the LED final stage.

SUB-CARRIER GENERATOR APPLICATION: voice operated wireless camera

Thanks to the operating frequency the TSH512 offers the possibility to generate usual audio sub-carriers

for video applications. The camera can be voice activated using the VOX-MUTE output of the TSH512.

The TSH512 also provides bias, amplification, ALC for the electret microphone.

Audio

amp1

Audio

amp2

LNA

LNA + ALC

LNA + ALC

TX2

TX1

VOX

SBY

buffer1

buffer2

RX2

RX1

Line inputs

Right

channel

Left

channel

Vcc

LED

photodiode

filter

filter

2.3 MHz

2.8 MHz

Vcc: 2.3 to 5.5V

Current < 15 mA

TSH512

TSH511

20 mW / 16

Ω

20 mW / 16

Ω

Power supply:

2.3 to 5.5V

Icc < 20 mA stereo

IR stereo HiFi transmitter

Headphone side

Hi

Fi

ste

re

o:

2.3

&

2.8

MH

z c

ar

rie

rs

Audio

amp1

Audio

amp2

LNA

LNA + ALC

LNA + ALC

TX2

TX1

VOX

SBY

buffer1

buffer2

RX2

RX1

Line inputs

Right

channel

Left

channel

Vcc

LED

photodiode

filter

filter

2.3 MHz

2.8 MHz

Vcc: 2.3 to 5.5V

Current < 15 mA

TSH512

TSH511

20 mW / 16

Ω

20 mW / 16

Ω

Power supply:

2.3 to 5.5V

Icc < 20 mA stereo

IR stereo HiFi transmitter

Headphone side

Hi

Fi

ste

re

o:

2.3

&

2.8

MH

z c

ar

rie

rs

TSH512

LNA + ALC

LNA + ALC

MIC. BIAS

MIC. BIAS

TX2

TX1

VOX

SBY

buffer1

buffer2

Vcc

6 or 6.5 MHz

filter

Electret Condenser

Microphone

Miniature camera

FM 2.4 GHz

transmitter

6 or 6.5 MHz

Audio sub-carrier

Video

VOX-MUTE

Stand-By

Σ

Sub-carrier

Stand-By

TSH512

LNA + ALC

LNA + ALC

MIC. BIAS

MIC. BIAS

TX2

TX1

VOX

SBY

buffer1

buffer2

Vcc

6 or 6.5 MHz

filter

Electret Condenser

Microphone

Miniature camera

FM 2.4 GHz

transmitter

6 or 6.5 MHz

Audio sub-carrier

Video

VOX-MUTE

Stand-By

ΣΣ

Sub-carrier

Stand-By