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參數(shù)資料
| 型號： | TSH512CF |
| 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)： | 15/19頁 |
| 文件大?。?/td> | 1281K |
| 代理商： | TSH512CF |
TSH512
15/19
Electret Condenser Microphone source
When a Electret Condenser Microphone (ECM) is
used, a high gain LNA is recommanded, but low
frequencies have to be attenuated. The ECM has
to be biased with a stable and clean reference
voltage.The TSH512 offers you the LNA and the
MIC-BIAS sections to perform this functions. (see
MIC-BIAS chapter).
Figure 3 :
Electret Condenser Microphone source
The capacitor C in serie with the microphone
stops the DC coming from MIC-BIAS.
The resistor R provides the DC from MIC-BIAS to
supply the ECM.
Thanks to the ALC (Automatic Level control), the
great variations of amplitude will not overmodulate
the transmitter (refer to the chapter on ALC).
The self-adaptative VOX (Voice Operated Trans-
mit) offers an automatic transmitting with a good
discrimination of the background noise (see the
chapter on VOX).
MIC-BIAS section: microphone bias voltage
The MIC-BIAS bias voltages are dedicated to the
bias of Electret Condenser Microphones. These
bias voltages on pin 10 for TX1 and pin 2 for TX2,
exhibit a low voltage noise density of 22nV/
SQR(Hz). This allows more than 55 dB S/N con-
sidering a bandwith of 7 kHz. (see the figure in the
’Electret Condenser Microphone source’ chapter).
The MIC-BIAS voltage is related with VCC as fol-
low (with I
MIC-BIAS
= 2.5 mA):
V
MIC-BIAS
= 0.844.VCC-0.140 (Volts)
Moreover, the supply rejection ratio is guaranteed
better than 50 dB without any decoupling capaci-
tor. To address biasing of most of the micro-
phones, the current drive capability is 2.5 mA. The
MIC-BIAS voltage depend linearly on the supply
voltage Vcc (refer to the curve ’MIC-BIAS vs.
VCC’).
ALC section: Automatic Level Control
Both transmitters of the TSH512 are including Au-
tomatic Level Control (ALC). When the level of
the audio signal is too high, the ALC compress the
signal in order to avoid overmodulation of the FM
VCO. Therefore, the ALC reduces the distorsion
and keep a reduced transmit spectrum with very
high amplitude signals.
Figure 4 :
Automatic Level Control Schematic
The ALC features a 20dB gain and an output sig-
nal regulated to 700 mVpp in compression.
The attack time is the response time of the ALC to
go from the linear amplification to the compression
region. The attack time mainly depends on C
ALC
capacitor value. A typical value of C
ALC
is 1μF with
music as audio signal (refer to the ’application
schematic’).
The decay time is the response time of the ALC to
recover a full gain amplifying mode from a com-
pression mode. The decay time depends mainly
on the R
ALC
resistor value. A typical value of R
ALC
is 470k with music as audio signal (refer to the ’ap-
plication schematic’).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| TSH60CD | 功能描述:運(yùn)算放大器 - 運(yùn)放 Lo Pwr Oper Amp Wide Band RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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