TSH512 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TSH512' PDF : 32 Pages View PDF
Application information
TSH512
4.2
Sub-carrier generator application: voice-operated wireless
camera
Thanks to its operating frequency, the TSH512 offers the possibility of generating usual
audio sub-carriers for video applications (Figure 23). 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.
Figure 23. Typical block diagram for audio sub-carrier generator
Miniature camera
Stand-By
Electret Condenser
Microphone
Video
S
Sub-carrier
TSH512
LNA + ALC
MIC. BIAS
TX2
VOX
buffer2
Vcc
SBY
VOX-MUTE
MIC. BIAS
LNA + ALC
TX1
buffer1
6 or 6.5 MHz filter
6 or 6.5 MHz
Audio sub-carrier
FM 2.4 GHz
transmitter
Stand-By
4.3
4.3.1
Multimedia application
Headset side
The TSH512 is used in mono mode to transmit the signal of the electret condenser
microphone of the headset. The circuit is supplied by batteries and the VOX function
switches off the output stages to save energy. The usual working frequency is 1.7 MHz for
infrared mono operation.
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Doc ID 8120 Rev 7
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