TSH511

5/18

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

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.

Audio

buffer1

Audio

buffer2

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

(Television)

IR stereo HiFi receiver

(Headphones)

Hi

Fi

ste

re

o:

2.3

&

2.8

MH

z c

arr

ier

s

Audio

buffer1

Audio

buffer2

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

(Television)

IR stereo HiFi receiver

(Headphones)

Hi

Fi

ste

re

o:

2.3

&

2.8

MH

z c

arr

ier

s