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MC34118-S28-R PDF预览

MC34118-S28-R

更新时间: 2024-01-04 14:00:13
品牌 Logo 应用领域
友顺 - UTC 电信集成电路电信电路电话电路光电二极管
页数 文件大小 规格书
12页 297K
描述
VOICE SWITCHED SPEAKER-PHONE CIRCUIT

MC34118-S28-R 技术参数

是否Rohs认证: 不符合生命周期:Active
零件包装代码:SOIC包装说明:SOP-28
针数:28Reach Compliance Code:compliant
HTS代码:8542.39.00.01风险等级:5.65
Is Samacsys:NJESD-30 代码:R-PDSO-G28
JESD-609代码:e0长度:17.7 mm
功能数量:1端子数量:28
最高工作温度:60 °C最低工作温度:-20 °C
封装主体材料:PLASTIC/EPOXY封装代码:SOP
封装等效代码:SOP28,.4封装形状:RECTANGULAR
封装形式:SMALL OUTLINE电源:3.5/6.5 V
认证状态:Not Qualified座面最大高度:2.8 mm
子类别:Telephone Circuits最大压摆率:0.008 mA
标称供电电压:5 V表面贴装:YES
技术:BIPOLAR电信集成电路类型:SPEAKER PHONE CIRCUIT
温度等级:OTHER端子面层:TIN LEAD
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL宽度:7.65 mm
Base Number Matches:1

MC34118-S28-R 数据手册

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MC34118  
LINEAR INTEGRATED CIRCUIT  
„
FUNCTIONAL DESCRIPTION  
INTRODUCTION  
Between operation of a speakerphone and a handset, the fundamental difference is that of half-duplex versus  
full-duplex. The UTC MC34118 includes the necessary level detectors, attenuators, and switching control for a  
properly operating speakerphone. The detection sensitivity and timing can be externally controlled. The UTC  
MC34118 also provides background noise monitors to make the circuit insensitive to room and line noise, hybrid  
amplifier to interface to Tip and Ring, the microphone amplifier, and other associated functions.  
ATTENUATORS  
The transmit and receive attenuators are complementary in function, and they are never both fully on or both  
fully off. For example, when one is at maximum gain: +6dB, the other is at maximum attenuation: -46dB, and vice  
versa. But sum of their gains remains constant at -40dB typically. To control the transmit and receive paths to  
provide the half-duplex operation required in speakerphone is the attenuators’ purpose. The attenuators are  
non-inverting, have a -3dB (from max gain) frequency of ~100kHz, their input impedance of each one is nominally  
10k, and to prevent distortion, their input signal should be limited to 350 mVrms(same as 990mvp-p). After the  
output current limit (typically 2.5mA) is reached, the output impedance is<10.  
VB  
10kꢀ  
TXI/RXI  
To Attenuator Input  
4.0kꢀ  
96Kꢀ  
These attenuators can be controlled by the Control Block’s output signal. When the CT pin which measures the  
signal is at +240mV with respect to VB, the circuit is in the receive mode and so receive attenuator is at +6dB. When  
the CT voltage is equal to VB, the circuit is in an idle mode, and it also causing the attenuators’ gains to be halfway  
between their fully on and fully off positions (typical -20 dB each). The most direct method to monitor the circuit’s  
mode is monitoring the CT voltage (with respect to VB).  
LEVEL DETECTORS  
There are two level detectors on the receive side and two level detectors on the transmit side. The terms in  
parentheses form one system, and the other terms form the second system. All the four level detectors are high  
amplifiers which have back-to-back diodes in the feedback path, and then it is resulting in non-linear gain, which  
permits operation over a wide dynamic range of speech levels. TLI1, TLI2, RLI1, and RLI2, the external resistor and  
capacitor determine the sensitivity of each level detector. Through a diode each output charges an external capacitor  
and limiting resistor, thus providing a DC representation of the input AC signal level. The capacitor and an internal  
350resistor provide the outputs’ quick rise time. And an internal current source and the capacitor set a slow decay  
time. On the receive side, RLI1 is at the receive input receiving the same signal as at Tip and Ring, and RLI2 is at  
the output of the speaker amplifier. On the transmit side, TLI2 is at the microphone amplifier, while TLI1 is at the  
hybrid output.  
UNISONIC TECHNOLOGIES CO., LTD  
7 of 12  
www.unisonic.com.tw  
QW-R108-007,D  

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