TSH512C View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TSH512C' PDF : 32 Pages View PDF
TSH512
Hi-fi stereo/mono infrared transmitter
and stereo sub-carrier generator
Features
■ Supply voltage: 2.3 to 5.5 V
■ Carrier frequency range: 0.4 to 11 MHz
■ High versatility: I/O pins for each section
■ Two FM transmitters for stereo
■ Sinusoidal carriers for high spectral purity
■ Micro- or line-level preamplifiers with ALC
■ VOX function to save on battery power
■ Transmitter TX2 standby for mono operation
Applications
■ Infrared hi-fi stereo transmitters
■ Infrared headsets
■ Stereo sub-carriers for video transmitters
■ Voice-operated wireless webcams
■ FM IF transmit systems
Description
The TSH512 is a 0.4- to 11-MHz dual FM
transmitter. Access pins to each section give high
versatility and allow for several different
applications: stereo headphone, multimedia
headset, audio sub-carrier generator.
The TSH512 integrates in a single chip low-noise
audio preamplifiers with ALC (automatic level
control), frequency-modulated oscillators, and
linear output buffers to drive the external
transistors. The sinusoidal carriers facilitate the
filtering and allow high performance audio
transmission.
The VOX (voice operated transmit) circuitry
disables the output buffer when there is no audio
signal to save battery power. For MONO
applications, the STANDBY pin enables one
transmitter only, reducing the supply current.
F
TQFP44
10 x 10 mm
Pin connections (top view)
44 43 42 41 40 39 38 37 36 35 34
1
VCO
33
PEA
2
32
ALC
3
TX2 Output
31
LNA
buffer
4
TSH512
30
5
29
6
VOX
28
7
-
Monostable
27
+
8
26
LNA
9
+
Output
TX1 buffer
25
-
ALC
+
10
-
24
PEA
11
23
VCO
12 13 14 15 16 17 18 19 20 21 22
The TSH512 forms a chipset with the dual
receiver TSH511.
May 2009
Doc ID 8120 Rev 7
1/31
www.st.com
31
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