- 您现在的位置：买卖IC网 > PDF目录373702 > TS34118CS (Taiwan Semiconductor Co., Ltd.) Voice Switched Speakerphone Circuit PDF资料下载
参数资料
| 型号： | TS34118CS |
| 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： | 8/20页 |
| 文件大小： | 328K |
| 代理商： | TS34118CS |
TS34118
8-20
2004/09 rev. B
Attenuators
The attenuators are controlled by the single output of the Control Block, which is measurable at the C
T
pin (pin 14).
When the C
T
pin is at +240 millivolts with respect to V
B
, the circuit is in the receive mode (receive attenuator is at
+6.0dB). When the C
T
voltage is at +240 millivolts with respect to V
B
, the circuit is in the transmit mode (transmit
attenuator is at +6.0dB). The circuit is in an idle mode when the C
T
voltage is equal to V
B
. Causing the attenuators gain
to be halfway between their fully on and fully off positions (-20dB each). Monitoring the C
T
voltage (with respect to V
B
) is
the most direct method of monitoring the circuit’s mode.
The inputs to the Control Block are seven, 2 from the comparators operated by the level detectors, 2 from the
background noise monitors, the volume control, the dial-tone detector, and the AGC circuit. These seven inputs are
described below.
Level Detectors
There are four level detectors-two on the receive side and two on the transmit side. Refer to Figure 4. The terms in
parentheses from one system, and the other terms from one system. Each level detector is a high gain amplifier with
back-to-bank diodes in the feedback path, resulting in non-linear gain, which permits operation over a wide dynamic
range of speech levels. The sensitivity of each level detector is determined by the external resistor and capacitor at
each input (TLI1, TLI2, RLI1 and RLI2). Each output charge an external capacitor through a diode and limiting resistor,
thus providing a do representation of the input as signal level. The outputs have a quick rise time (determined by the
capacitor and an internal 350
resistor), and a slow decay time set by an internal current source and the capacitor. The
capacitors on the four outputs should have the same value (±10%) to prevent timing problems. Referring to Figure 2, on
the receives side, one level detector (RLI1) is at the receive input receiving thus same signal as at Tip and Ring, and
the other (PLI2) is at the output of the speaker amplifier. On the transmit side, one level detector (TLI2) is at the output
of the microphone amplifier, while the other (TLI1) is at the hybrid output. Outputs RLO1 and TLO1 feed a comparator,
the output of which goes to the Attenuator Control Block. Likewise, outputs RLO2 and TLO2 feed a second comparator
which also goes to the Attenuator Control Block. The touch table for the effects of the level detectors on the Control
Block is given in the section describing the Control Block.
Figure 4. Level Detectors
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| TS3431AILT | 1.24V programmable shunt voltage reference |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| TS34119 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:Low Power Audio Amplifier |
| TS34119_07 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:Low Power Audio Amplifier |
发布紧急采购，3分钟左右您将得到回复。