參數(shù)資料
型號(hào)： TSH512CYFT
廠商： STMICROELECTRONICS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： 10 X 10 MM, ROHS COMPLIANT, TQFP-44
文件頁數(shù)： 6/31頁
文件大?。?/td> 1350K
代理商： TSH512CYFT
Application information
TSH512
14/31
Doc ID 8120 Rev 7
4
Application information
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
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
Audio
amp1
Audio
amp2
SBY
1
SBY
2
SQ
U
EL
C
H
LNA
LNA + ALC
SBY
buffer1
buffer2
RX2
RX1
Line inputs
Right
channel
Left
channel
Vcc
LED
photodiode
filter
2.3 MH z
2.8 MH z
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
HiF
i s
ter
eo
:
2.3
&
2.
8 M
Hz
ca
rrie
rs
VOX
TX1
TX2
SQ
U
EL
C
H
SQ
U
E
L
C
H
RX2
RX1
LED
filter
20 mW / 16
Ω
20 mW / 16
Ω
:
VOX
TX1
TX2
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