数据搜索系统，热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

预览 PDF HTML

TSH512CF 数据表(PDF) 14 Page - STMicroelectronics

部件名 TSH512CF
功能描述  HiFi stereo/mono infrared transmitter Stereo sub-carrier generator
PDF  19 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TSH512CF 数据表(HTML) 14 Page - STMicroelectronics

Back Button TSH512CF Datasheet HTML 10Page - STMicroelectronics TSH512CF Datasheet HTML 11Page - STMicroelectronics TSH512CF Datasheet HTML 12Page - STMicroelectronics TSH512CF Datasheet HTML 13Page - STMicroelectronics TSH512CF Datasheet HTML 14Page - STMicroelectronics TSH512CF Datasheet HTML 15Page - STMicroelectronics TSH512CF Datasheet HTML 16Page - STMicroelectronics TSH512CF Datasheet HTML 17Page - STMicroelectronics TSH512CF Datasheet HTML 18Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 14 / 19 page
background image
TSH512
14/19
GENERAL DESCRIPTION
The TSH512 is a 0.4 to 11 MHz dual FM analog
transmitter. This circuit offers the functions need-
ed for an advanced infrared STEREO transmitter.
The access pins for each section allow a high ver-
satility and therefore a lot of applications: mono in-
frared transmitter, stereo transmitter, mono/stereo
sub-carrier generator for video transmissions (ie:
popular 2.4GHz video links).
Figure 1 : TSH512 bloc diagram
Each audio input is amplified with a Low Noise
Amplifier (LNA section) allowing connection to line
level sources or directly to a microphone. Built-in
voltage references ’MIC BIAS’ provide bias for
Electret Condenser Microphones (ECM) with a
high power supply rejection ratio.
Each audio path includes also an Automatic Level
Control (ALC) to limit the overmodulation and the
distorsion on very high signal amplitudes. The fol-
lowing operationnal amplifier (PEA) allows a
preamphasis transfer function before modulating
the varicap diode.
Built-in voltage references (VCO-BIAS) offers a
regulated voltage to bias the varicap diodes. The
Voltage Controlled Oscillator (VCO) is an integrat-
ed oscillator giving typically 600 mV peak to peak
at 2.8 MHz.
The Output Buffer section amplifies linearly the
FM carrier to provide a sinusoidal output. This si-
nusoidal signals reduce the intermodulation prod-
ucts beetween the carriers, specially in two-way or
in multicarrier systems (see the chapter ’ Applica-
tions’).
The Voice Operated Transmit (VOX) function au-
tomatically detects when an audio signal appear
over the background noise.
The stand-by of the second transmitter reduces
consumption in mono operation.
LNA section: Low Noise Amplifier
For each transmitter, the audio source is connect-
ed to the LNA. The LNA stage is a low noise oper-
ationnal amplifier typically usable with a gain from
0dB to 40dB.
Figure 2 : LNA schematic
The LNA gain is given by:
GLNA (dB) = 20.Log(1+RLNA2/RLNA1)
The High-pass cut-off frequency is:
fHPF = 1/(2.πRLNA1.CLNA1)
The Lowpass filter cut-off frequency is:
fLPF = 1/(2.πRLNA2.CLNA2)
If you connect an external circuit to the LNA out-
put, the impedance of this external circuit should
be higher than 10 M
Ω and the capacitance lower
than 50 pF in order to keep a good stability.
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
1
+
-
+
-
TSH512
Monostable
ALC
ALC
VCO
VCO
Output
buffer
Output
buffer
TX1
TX2
LNA
LNA
VOX
+
-
PEA
PEA
GND
BUF-IN2
BUF-OUT2
GND
VOX-TIMER
VOX-INTN
VOX-MUTE
VCC
BUF-OUT1
BUF-IN1
GND
DEC2
MIC-BIAS2
GND
VCC
SBY
VOX-INTS
VOX-SENS
VCC
GND
MIC-BIAS1
DEC1
Bias
Bias
Bias
Bias
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
1
+
-
+
-
TSH512
Monostable
ALC
ALC
VCO
VCO
Output
buffer
Output
buffer
TX1
TX2
LNA
LNA
VOX
+
-
PEA
PEA
GND
BUF-IN2
BUF-OUT2
GND
VOX-TIMER
VOX-INTN
VOX-MUTE
VCC
BUF-OUT1
BUF-IN1
GND
DEC2
MIC-BIAS2
GND
VCC
SBY
VOX-INTS
VOX-SENS
VCC
GND
MIC-BIAS1
DEC1
Bias
Bias
Bias
Bias
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
1
+
-
+
-
+
-
+
-
TSH512
Monostable
ALC
ALC
VCO
VCO
Output
buffer
Output
buffer
TX1
TX2
LNA
LNA
VOX
+
-
+
-
PEA
PEA
GND
BUF-IN2
BUF-OUT2
GND
VOX-TIMER
VOX-INTN
VOX-MUTE
VCC
BUF-OUT1
BUF-IN1
GND
DEC2
MIC-BIAS2
GND
VCC
SBY
VOX-INTS
VOX-SENS
VCC
GND
MIC-BIAS1
DEC1
Bias
Bias
Bias
Bias
Bias
Bias
Bias
Bias



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19


数据表 下载

Go To PDF Page


链接网址



ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   数据表链接    |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com