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MC34118 bảng dữ liệu(PDF) 3 Page - Unisonic Technologies

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Giải thích chi tiết về linh kiện  VOICE SWITCHED SPEAKER-PHONE CIRCUIT
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UNISONIC TECHNOLOGIES CO., LTD
MC34118
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
3 of 15
www.unisonic.com.tw
QW-R108-007.F
PIN DESCRIPTION
PIN NO
PIN NAME
DESCRIPTION
1
FO
Output of filter. The output impedance is less than 50Ω.
2
FI
Input of filter. The input impedance is less than 1MΩ.
3
CD
Chip Disable input .A logic low (voltage lower than 0.8V) sets normal operation. A logic
high (voltage higher than 2V) disable the IC. This pin’s input impedance is 90 KΩ
nominally.
4
VCC
This pin requires a supply voltage of +2.8V ~ +6.5V at 5mA. After VCC falls from 3.5V ~
2.8V, when in the receive mode, an AGC circuit reduces the receive attenuator gain by
25dB.
5
HTO+
The output of the second hybrid amplifier. This amplifier’s gain is internally set at -1.
6
HTO-
Output of the first hybrid amplifier. This amplifier’s gain of the amplifier is set by
external resistors.
7
HTI
The first hybrid amplifier’s input and summing node. DC level is about equal to VB.
8
TXO
The transmit attenuator’s output. DC level is about VB.
9
TXI
The transmit attenuator’s input. It’s maximum signal level is 350 mVrms. The input
impedance is 10KΩ.
10
MCO
The microphone amplifier’s output. This amplifier’s gain is set by external resistors.
11
MCI
The summing node of the microphone’s input. DC lever is VB.
12
MUT
Input of mute. A logic low (voltage lower than 0.8V) sets the circuit normal operation. A
logic high (voltage higher than 2V) mutes the microphone amplifier, but it doesn’t affect
the rest of the circuit. The input impedance is 90 K ohms.
13
VLC
The input of Volume control. In the receive mode, when VLC=VB, the receive
attenuator is at maximum gain. The receive gain is down 35dB when VLC=0.3dB, and
it does not effect the transmit modes.
14
CT
At this pin, to switch modes, the RC sets the response time for the circuit.
15
VB
In this pin, there’s an output voltage=Vcc/2 which is a system AC ground and biases
the volume control. What required is a filter capacitor.
16
CPT
The time constant for the transmit background side can be set by the RC at this pin .
17
TLI2
The input to the transmit level detector which is on the microphone/ speaker side.
18
TLO2
The output to the transmit level detector which is on the microphone/ speaker side.
Also the input to the transmit background monitor.
19
RLO2
The Output of the receive level detector which is on the microphone/ speaker side
20
RLI2
The input to the receive level detector which is on the microphone/ speaker side
21
RXI
The input to the receive attenuator and dial tone detector. In this pin, the maximum
input level is 350mVrms,and the input impedance is 10KΩ.
22
RXO
The output of the receive attenuator. This pin’s DC level is VB.
23
TLI1
The input to the transmit level detector which is on the line side.
24
TLO1
The output to the transmit level detector which is on the line side, and also the input to
the transmit background monitor.
25
RLO1
The output of the receive level detector which is on the line side.
26
RLI1
The input to the receive level detector which is on the line side.
27
CPR
The time constant for the receive background monitor can be set by the RC at this pin.
28
GND
Ground.


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