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參數(shù)資料
| 型號(hào)： | TSH512C |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | HiFi stereo/mono infrared transmitter Stereo sub-carrier generator |
| 中文描述： | 高保真立體聲/單聲道立體聲紅外線發(fā)射器副載波發(fā)生器 |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 1281K |
| 代理商： | TSH512C |
TSH512
16/19
VOX description: Voice Operated Transmit
The Voice Operated Transmit section (VOX) re-
duces consumption when there is no audio signal
to transmit. When the VOX detects that no audio
signal is present, it mutes the Output Buffers of
TX1 and TX2 and provides the logic signal
VOX-MUTE to switch-off external LED drivers if
needed.
The audio signal of TX1 is amplified with a gain
depending on Rsens and Csens. Rsens and Cs-
ens are connected to pin 7. The high-pass filtering
has the following cut-off frequency:
f
HPF
= 1/(2.
π
R
sens
.C
sens
)
Figure 5 :
Vox delay and sensitivity schematic
On pin 6, Rpeak and Cpeak integrate the rectified
audio signal with a short time constant. This fil-
tered signal follows the audio amplitude.
Figure 6 :
Vox integrator and monostable
schematic
The self-adaptative VOX threshold consist in the
constatation that the ambient background noise
variation is slow compared to the voice or the mu-
sic. On the pin 28, R
COMP
and C
COMP
integrates
the amplitude to follow the background amplitude.
Therefore, the comparator switches when an au-
dio signal appears over the background noise.
Refering to the ’application schematic’, C
COMP
will
be typically a 100nF capacitor and R
COMP
will be
determined depending on the audio signal.
As soon as an audio is detected, the output of the
monostable switches to ’high’ state and enables
both output buffers. The output of the monostable
is the pin 27 and is called ’VOX-MUTE’.
The monostable holds the TSH512 in transmit
mode during a delay fixed by the value of C
TRIG
connected to pin 29
Please note that the VOX function is activated with
the audio coming into the first transmitter TX1.
When the application needs a permanent trans-
mission, it is possible to inhibit the VOX function.
Just remove CTRIG capacitor and connect pin 29
to ground.
As soon as the TSH512 is powered-on, the inter-
nal reset circuitry sets the VOX-MUTE to high
state to enable transmission. The transmission re-
mains during the monostable timing and continue
if an audio signal triggs the monostable
Figure 7 :
VOX state at power-on
VOX
DELAY
V
5
μ
A
-----------
Ctrig
=
time
VOX-MUTE
POWER SUPPLY
on
off
(Ctrig)
0
1
highstate if retriggered by audio
VOX Delay
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參數(shù)描述 |
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| 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 |
| TSH512CFT | 功能描述:音頻發(fā)送器、接收器、收發(fā)器 Hi Fi stereo mono infrared transmitter RoHS:否 制造商:Cirrus Logic 工作電源電壓:3.3 V, 5 V 電源電流:11.8 mA 通道數(shù)量:1 最大工作溫度:+ 70 C 接口類型:I2C, SPI 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-28 封裝: |
| TSH512CYFT | 功能描述:IC IR TRANSMITTER HIFI 44LQFP RoHS:是 類別:RF/IF 和 RFID >> RF 發(fā)射器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- 頻率:310MHz ~ 440MHz 應(yīng)用:- 調(diào)制或協(xié)議:UHF，ASK 數(shù)據(jù)傳輸率 - 最大:20 kBaud 功率 - 輸出:1dBm ~ 5dBm 電流 - 傳輸:10mA 數(shù)據(jù)接口:PCB，表面貼裝 天線連接器:PCB，表面貼裝 存儲(chǔ)容量:- 特點(diǎn):- 電源電壓:2.2 V ~ 4 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-LSSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| TSH60 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Wide-Band, Low-Power Operational Amplifiers with Standby |
| TSH60C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Wide-Band, Low-Power Operational Amplifiers with Standby |
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