TSH511C(2002) 데이터 시트보기 (PDF) - STMicroelectronics

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TSH511C
(Rev.:2002)

HiFi stereo/mono infrared receiver Stereo sub-carrier demodulator

STMicroelectronics 

TSH511

INFRARED STEREO HEADPHONE APPLICATION

The right side of the figure shows the block-diagram of an infrared stereo receiver using the TSH511. The

sensitive LNA directly connected to the photodiode does not require an external pre-amplifier. After filter-

ing, the amplified signals are limited and demodulated with quadrature demodulators. The two integrated

audio buffers directly drive the stereo headphones. The audio power reaches 2x20mW in two 16Ω loads.

The built-in squelch function fades-out the audio when the incoming infrared signal is low. The standby in-

puts SBY1 and SBY2 enable only one receiver for the mono applications.

IR stereo HiFi transmitter

(Television)

IR stereo HiFi receiver

(Headphones)

Vcc: 2.3 to 5.5V

Current < 15 mA

Right

channel

LNA + ALC

Line inputs

Left

channel

LNA + ALC

TSH512

TX2

VOX

buffer2

SBY

TX1

buffer1

Power supply:

2.3 to 5.5V

Icc < 20 mA stereo

photodiode

Vcc

LNA

LED

Hi2F.i3s&te2re.8o:MHz

carriers

2.3 MHz

filter

RX2

TSH511

Audio

buffer2

20 mW / 16 Ω

RX1

filter

2.8 MHz

Audio

buffer1

20 mW / 16 Ω

5/18

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