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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： | 14/31页 |
| 文件大小： | 1350K |
| 代理商： | TSH512CFT |
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TSH512
General description
Doc ID 8120 Rev 7
21/31
5.4
ALC section: automatic level control
Both transmitters of the TSH512 include an automatic level control (ALC). When the level of
the audio signal is too high, the ALC compresses the signal in order to avoid over-
modulation of the FM VCO. In this way, the ALC reduces the distortion and maintains a
reduced transmit spectrum with very high amplitude signals.
Figure 28.
Automatic level control schematics
The ALC features a 20 dB gain and an output signal 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 the capacitor value of CALC.
page 15).
The decay time is the response time the ALC requires to recover to full gain amplifying
mode after being in compression mode. The decay time depends mainly on the RALC
5.5
VOX description: voice operated transmit
The voice operated transmit (VOX) section reduces 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 the external
LED drivers if needed.
The audio signal of TX1 is amplified with a gain dependent on the values of Rsens and Csens.
Rsens and Csens are connected to pin 7. The high-pass filtering has the following cut-off
frequency:
f
HPF
1
2
π R
sens
C
sens
()
--------------------------------------------------
=
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相关代理商/技术参数 |
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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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