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| 型号： | TSH512CFT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封装： | 10 X 10 MM, ROHS COMPLIANT, TQFP-44 |
| 文件页数： | 18/31页 |
| 文件大小： | 1350K |
| 代理商： | TSH512CFT |
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TSH512
General description
Doc ID 8120 Rev 7
25/31
5.7
VCO section: voltage-controlled oscillator
Each TSH512 transmitter has its own oscillator to generate the carrier. The audio signal is
applied to the varicap diode to perform the frequency modulation. Thanks to the VCO-BIAS
voltage reference, the DC bias of the varicap is stabilized. The high power supply rejection
ratio (PSRR) of the VCO-BIAS ensures good immunity with the noise of the power supply.
Figure 33.
VCO schematics
The generated frequency can be set from 400 kHz to 11 MHz by external components.
Refer to Table 1 for the usual frequencies in infrared audio.
The working frequency is:
where Ct is the total capacity of CL, Cp, Cs and Cv:
Ct = 1/(1/Cc+1/CL) with Cc = Cp+1/(1/Cv+1/Cs)
It is possible to use varicap diodes SMV1212 (Alpha Ind.) or ZC833 (Zetex).
The output level of the VCO can be reduced by adding the resistor RVCO between pin 19
and pin 20 or between pin 36 and pin 37 for TX1 and TX2 respectively.
Table 5.
Usual infrared frequencies
IR frequency in MHz
Applications
1.6
AM mono
1.7
FM mono
2.3
FM right channel
2.8
FM left channel or mono
f
VCO
1
2
π LCt
()
---------------------------------
=
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| TSH512CYFT | 功能描述:IC IR TRANSMITTER HIFI 44LQFP RoHS:是 类别:RF/IF 和 RFID >> RF 发射器 系列:- 标准包装:4,000 系列:- 频率:310MHz ~ 440MHz 应用:- 调制或协议:UHF，ASK 数据传输率 - 最大:20 kBaud 功率 - 输出:1dBm ~ 5dBm 电流 - 传输:10mA 数据接口:PCB，表面贴装 天线连接器:PCB，表面贴装 存储容量:- 特点:- 电源电压:2.2 V ~ 4 V 工作温度:-40°C ~ 85°C 封装/外壳:16-LSSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| TSH60 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Wide-Band, Low-Power Operational Amplifiers with Standby |
| TSH60C | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Wide-Band, Low-Power Operational Amplifiers with Standby |
| TSH60CD | 功能描述:运算放大器 - 运放 Lo Pwr Oper Amp Wide Band RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TSH60CDT | 功能描述:运算放大器 - 运放 Wide band low power operational RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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