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參數(shù)資料
| 型號(hào)： | TSH511CFT |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | HiFi stereo/mono infrared receiver Stereo sub-carrier demodulator |
| 中文描述： | 高保真立體聲/單聲道立體聲紅外線接收副載波解調(diào)器 |
| 文件頁(yè)數(shù)： | 14/18頁(yè) |
| 文件大?。?/td> | 1172K |
| 代理商： | TSH511CFT |
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TSH511
14/18
GENERAL DESCRIPTION
The TSH511 is a 0.4 to 11 MHz dual FM analogue
receiver. The incoming signal is amplified with a
22 dB Low Noise Amplifier (LNA section). The
good noise performance of the LNA allows the
photodiode for infrared applications to be connect-
ed directly to the TSH511 without any external
preamplifier. The access pins for each section and
the two standby configurations allow a high versa-
tility for many applications: HiFi stereo infrared re-
ceiver, mono/stereo subcarrier receiver, power
line carrier audio.
Figure 1 :
TSH511 block diagram
The LNA is common to both receivers but the out-
put is split in two: one for each receiver. Each LNA
output can be connected to a first optional filter for
bandpass or reject filtering.
The filtered signal is amplified with an intermedi-
ate Amplifier (AMP section) followed by a second
filter. The AMP sections have 20 dB typical gain.
Finally, the signal is amplified and limited in the
Limiter (LIM section). The 60 dB amplifier-limiter
LIM provides a constant amplitude signal to the
demodulator. It reduces AM parasitics demodula-
tion in the FM demodulator.
The FM demodulator is a classical quadrature de-
tector using an external tank.
The demodulated signal can be amplified by the
Audio Buffer section after de-emphasis. Each Au-
dio Buffer can drive a 16 ohms headphone with 20
mW power.
The two standby pins SBY1 & SBY2 allow the sec-
ond receiver RX2 to be put into standby for mono
operation. In mono, it is possible to use both Audio
Buffers or only one depending on the combination
on SBY1 & SBY2.
To avoid noise at the audio output, a Squelch sec-
tion mutes the Audio Buffers when no carrier is re-
ceived. The Squelch Section uses the demodulat-
ed signal of the first receiver (RX1). This signal is
highpass filtered, rectified and compared to a
threshold to produce the Mute signal (pin 25).
When no carrier is received on RX1, the wideband
’FM noise’ on the demodulator increases and the
Mute signal mutes the both Audio Buffers. When
the carrier is present, the wideband noise on the
demodulator output decreases, enabling the Au-
dio Buffers.
Figure 2 :
Infrared audio frequencies
LNA section: Low Noise Amplifier
The Low Noise Amplifier (LNA) has a typical gain
of 22 dB to amplify the incoming RF signal from
the photodiode. The LNA is common to both re-
ceivers sections RX1 and RX2.
Figure 3 :
LNA schematic
BUF-OUT2
BUF-OUT1
MUTE-OUT
MUTE-INT
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
TSH511
buffers
Standby
RX1
RX2
SQUELCH
GND
SBY1
SBY2
VCC
DEC-OUT
GND
MUTE-IN
GND
AMP-IN2
VCC
LNA-OUT2
VCC
LNA-IN
GND
LNA-OUT1
VCC
AMP-IN1
DEC-LNA
Vref
LNA
amp.
limiter
FM demodulator
limiter
amp.
FM demodulator
M
B
Audio
A
G
L
D
L
D
V
M
G
A
G
L
D
L
D
M
V
M
G
B
IR frequency
applications
1.6 MHz
AM mono
1.7 MHz
FM mono
2.3 MHz
FM right channel
2.8 MHz
FM left channel or mono
相關(guān)PDF資料 |
PDF描述 |
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| TSH512 | HiFi stereo/mono infrared transmitter Stereo sub-carrier generator |
| TSH512C | HiFi stereo/mono infrared transmitter Stereo sub-carrier generator |
| TSH512CF | HiFi stereo/mono infrared transmitter Stereo sub-carrier generator |
| TSH512CFT | HiFi stereo/mono infrared transmitter Stereo sub-carrier generator |
| TSH691ID | LOW COST 40MHz - 1GHz AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSH511CYFT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Hi-fi stereo/mono infrared receiver and stereo sub-carrier demodulator |
| TSH512 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Hi-fi stereo/mono infrared transmitter and stereo sub-carrier generator |
| TSH512_09 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Hi-fi stereo/mono infrared transmitter and stereo sub-carrier generator |
| TSH512C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HiFi stereo/mono infrared transmitter Stereo sub-carrier generator |
| TSH512CF | 功能描述:音頻 DSP Dual FM Transmitter RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
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