TSH512C View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TSH512C' PDF : 32 Pages View PDF
Application information
4
Application information
TSH512
This section gives application information for some typical applications.
4.1
Infrared stereo transmitter application (stereo headphones)
In this application, shown in Figure 21, the hi-fi 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
buffered to drive the LED.
Figure 21. Hi-fi stereo headphone block diagram
IR stereo HiFi transmitter
Headphone side
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
H2iF.3i s&te2re.8o:MHz carriers
2.3 MH z
f ilter
RX2
TSH511
Audio
amp2
20 mW / 16 Ω
RX1
Audio
amp1
20 mW / 16 Ω
f ilter
2.8 MH z
The audio signals are transmitted on the left and the right channels using 2.8- and 2.3-MHz
carriers. The VOX activates the TX1 transmitter when the audio signal is present
(Figure 22).
14/31
Doc ID 8120 Rev 7
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