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参数资料
| 型号： | TS34118CD |
| 厂商： | Taiwan Semiconductor Co., Ltd. |
| 英文描述： | Voice Switched Speakerphone Circuit |
| 中文描述： | 语音开关扬声器电路 |
| 文件页数： | 12/20页 |
| 文件大小： | 328K |
| 代理商： | TS34118CD |
TS34118
12-20
2004/09 rev. B
Microphone Amplifier
Figure 7. Microphone Amplifier and Mute
Hybrid Amplifiers
The two hybrid amplifiers (at HTO+, HTO-, and HTI), in conjunction with an external transformer, provide the two-to four
wire converter for interfacing to the telephone line. The gain of the first amplifier (HTI to HTO-) is set by external resistors
(gain=-R
HF
/P
HI
in Figure 2), and its output drives the second amplifier, the gain of which is internally set at –1.0. Unlike
most op-amps, the amplifiers have all-NPN output stage, which maximizes phase margin and gain-bandwidth. This
feature ensures stability at gains less than unity, as well as with a wide range of reactive loads. The open loop gain of the
first amplifier is typically 80dB , and the gain bandwidth of each amplifier is
≈
1.0MHz (see Figure 16). The maximum p-p
output swing of each amplifier is typically 1.2 volts less than Vcc with an output impedance of <10
until current limiting is
reached (typically 8.0mA). The output current capability is guaranteed to be a minimum of 5.0mA. The bias current at HTI
is typically 30nA out of the pin.
The connections to the coupling transformer are shown in the Block Diagram (Figure 2). The block labeled Zbal is the
balancing network necessary to match the line impedance.
Filter
The operation of the filter circuit is determined by the external components. The circuit within the TS34118, from pins FI to
FO is a buffer with a high input impedance (>1.0M
), and a low output impedance (<50
). The configuration of the
external components determines whether the circuit is a high-pass filter (as shown in Figure 2), a low-pass filter, or a
band-pass filter.
As a high pass filter, with the components shown in Figure 8, the filter will keep out 60Hz (and 120Hz) hum which can be
picked up by the external telephone lines.
Figure 8. High Pass Filter
相关PDF资料 |
PDF描述 |
|---|---|
| TS34118CS | Voice Switched Speakerphone Circuit |
| TS34119 | Low Power Audio Amplifier |
| TS34119CD | Low Power Audio Amplifier |
| TS34119CS | Low Power Audio Amplifier |
| TS34119CA | COAXIAL T CNNCTRS NON-BH BNC AUTO T-CNNCTR F-M-F |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TS34118CD28C4 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:Voice Switched Speakerphone Circuit |
| TS34118CS | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:Voice Switched Speakerphone Circuit |
| TS34118CS28 | 功能描述:电信语音调制 IC Voice Switch Speaker phone Circuit RoHS:否 制造商:Epson Electronics America 产品: 应用:Voice Guidance product 封装 / 箱体:PQFP-52 电源电压-最大:3.6 V, 5.5 V 最大工作温度: 最小工作温度: 封装: |
| TS34118CS28 C8 | 制造商:SKMI/Taiwan 功能描述:Voice Switched Speakerphone Circuit 28-Pin SOP Tube |
| TS34118CS28C8 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:Voice Switched Speakerphone Circuit |
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