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PDF TSH512CFT Data sheet ( Hoja de datos )
| Número de pieza | TSH512CFT | |
| Descripción | HiFi stereo/mono infrared transmitter Stereo sub-carrier generator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TSH512CFT (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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TSH512
HiFi stereo/mono infrared transmitter
Stereo sub-carrier generator
s Supply voltage: 2.3V to 5.5V
s Carriers frequency range: 0.4 to 11 MHz
s High versatility: I/O pins for each section
s Two FM transmitters for stereo
s Sinusoidal carriers for high spectral purity
s Micro or line level preamplifiers with ALC
s VOX function to save on battery power
s Transmitter 2 Standby for mono operation
DESCRIPTION
The TSH512 is a 0.4 to 11 MHz dual FM transmit-
ter. Access pins to each section give a high versa-
tility and allow several applications: stereo head-
phone, multimedia headset, audio sub-carrier
generator.
The TSH512 integrates in one chip:
Low-noise audio preamplifiers with ALC (Automat-
ic Level Control), frequency modulated oscillators,
and linear output buffers to drive external transis-
tors. The sinusoidal carriers facilitates the filtering
and allows high performance audio transmission.
The VOX (Voice Operated Transmit) circuitry dis-
ables the output buffer when there is no audio to
save battery power.
For MONO applications, the STAND-BY pin en-
ables one transmitter only, reducing the supply
current.
The TSH512 forms a chipset with the dual receiv-
er TSH511.
APPLICATIONS
s Infrared HiFi stereo transmitter
s Infrared Headsets
s Stereo sub-carrier for video transmitters
s Voice operated wireless webcams
s FM IF transmit systems
ORDER CODE
Part Number
Temperature
Range
TSH512CF
TSH512CFT
-40°C to
+85°C
-40°C to
+85°C
Package
TQFP44
TQFP44
Conditionning Marking
Tray TSH512C
Tape & reel TSH512C
PACKAGE
F
TQFP44
10 x 10 mm
PIN CONNECTION (top view)
44 43 42 41 40 39 38 37 36 35 34
1
2
3
LNA
4
5
PEA
VCO
ALC
TX2
TSH512
Output
buffer
33
32
31
30
29
6
VOX
28
7+
-
Monostable 27
8
LNA
9+
-
10
Output
TX1 buffer
ALC
+
-
PEA
26
25
24
11 23
VCO
12 13 14 15 16 17 18 19 20 21 22
December 2002
1/19
1 page  
TSH512
INFRARED STEREO TRANSMITTER APPLICATION (ie: stereo headphone)
The HiFi 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 bufferized to attack the LED final stage.
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
Hi2F.i3s&te2re.8o:MHz
carriers
2.3 MHz
filter
RX2
TSH511
Audio
amp2
20 mW / 16 Ω
RX1
Audio
amp1
20 mW / 16 Ω
filter
2.8 MHz
SUB-CARRIER GENERATOR APPLICATION: voice operated wireless camera
Thanks to the operating frequency the TSH512 offers the possibility to generate usual audio sub-carriers
for video applications. 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.
Miniature camera
Stand-By
Electret Condenser
Microphone
Video
Σ
Sub-carrier
TSH512
LNA + ALC
TX2
MIC. BIAS
MIC. BIAS
VOX
LNA + ALC
TX1
6 or 6.5 MHz
buffer2
Vcc
SBY
VOX-MUTE
buffer1
filter
6 or 6.5 MHz
Audio sub-carrier
FM 2.4 GHz
transmitter
Stand-By
5/19
5 Page 
PEA Output Voltage vs. Temperature
800
700
600
500
400
300
200
100
R =22KΩ
L-PEA
G = 0dB
LNA
G = 0dB
PEA
0
-40 -20
0
V = 2.7V
CC
V = 5V
CC
20 40 60 80
T (°C)
AMB
PEA Output Voltage vs. Resistor Load
TSH512
MIC-BIAS Voltage vs. MIC-BIAS Current
2.4
2.2
V = 2.3V
CC
2.0
1.8
1.6
01234
I (mA)
MIC-BIAS
LNA+ALC+PEA Distorsion vs. Input Voltage
600
V = 2.7V
CC
500
400
300
200
100
1k 10k 100k
RL-PEA(Ω)
1M
MIC-BIAS Output Voltage vs. Supply Voltage
4.5
I = 2.5mA
MIC-BIAS
4.0
3.5
3.0
2.5
2.0
1.5
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
V (V)
CC
10
V = 2.7V
CC
1 V = 2.3V
CC
R = 22KΩ
L-PEA
G = 0dB
LNA
G = 0dB
PEA
0.1
0.01
0.02
0.04
0.06
V (V )
IN pp
V = 5.5V
CC
0.08 0.10
MIC-BIAS Output Voltage vs. Temperature
2.4
V = 2.7V
CC
I = 2.5mA
MIC-BIAS
2.3
2.2
2.1
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80
T (°C)
AMB
11/19
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet TSH512CFT.PDF ] | |
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