TSH512CFT(2001) データシートの表示（PDF） - STMicroelectronics

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TSH512CFT
(Rev.:2001)

HiFi stereo/mono infrared transmitter Stereo sub-carrier generator

STMicroelectronics 

TSH512

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.

IR stereo HiFi transmitter

Headphone side

Vcc: 2.3 to 5.5V

Current < 15 mA

Right

LNA + ALC

channel

Line inputs

Left

channel

LNA + ALC

TSH512

TX2

VOX

buffer2

S BY

TX1

buffer1

Power supply:

2.3 to 5.5V

Icc < 20 mA stereo

photodiode

Vcc

LNA

LED

H2iF.3i s&te2re.8o:MHz

carriers

2.3 MHz

filter

RX2

TSH511

Audio

amp2

20 mW / 16 Ω

RX1

Audio

amp1

20 mW / 16 Ω

filter

2.8 MHz

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.

Miniature camera

Stand-By

Electret Condenser

Microphone

Video

Σ

Sub-carrier

TSH512

LNA + ALC

TX2

MIC. BIAS

MIC. BIAS

VOX

LNA + ALC

TX1

6 or 6.5 MHz

buffer2

Vcc

SBY

VOX-MUTE

buffer1

filter

6 or 6.5 MHz

Audio sub-carrier

FM 2.4 GHz

transmitter

Stand-By

5/19

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