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TS34118CS28RD Arkusz danych(PDF) 5 Page - Taiwan Semiconductor Company, Ltd

Numer części TS34118CS28RD
Szczegółowy opis  Voice Switched Speakerphone Circuit Chip disable for active/standby operation
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Producent  TSC [Taiwan Semiconductor Company, Ltd]
Strona internetowa  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS34118CS28RD Arkusz danych(HTML) 5 Page - Taiwan Semiconductor Company, Ltd

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TS34118
Voice Switched Speakerphone Circuit
5/21
Version: A13
Pin Function Description
Pin
Name
Description
1
FO
Filter output. Output impedance is less than 50 ohms.
2
FI
Filter input. Input impedance is greater than 1.0Mohm.
3
CD
Chip Disable. A logic low(<0.8V) sets normal operation. A logic high (>2.0V) disables the IC
to conserve power. Input impedance is norminally 90KΩ.
4
Vcc
A supply voltage of +2.8 to +6.5 volts is required, at ≈5.0mA. As Vcc falls from 3.5 to
2.8volts, an AGC circuit reduces the receive attenuator gain by ≈25dB (when in the receive
mode).
5
HTO+
Output of the second hybrid amplifier. The gain is internally set at –1.0 to provide a
differential output, in conjunction with HTO-, to the hybrid transformer.
6
HTO-
Output of the first hybrid amplifier. The gain of the amp is set by external resistors.
7
HTI
Input and summing node for the first hybrid amplifier . DC level is≈VB.
8
TXO
Output of the transmit attenuator. DC level is approximately VB.
9
TXI
Input to the transmit attenuator. Max. Signal level is 350m Vrms . Input impedance is 10KΩ.
10
MCO
Output of the microphone amplifier. The gain of the amplifier is set by external resistors.
11
MCI
Input and summing node of the microphone amplifier. DC level is≈ VB.
12
MUT
Mute input. A logic low(<0.8V) sets normal operation. A logic high (>2.0V) mutes the
microphone amplifier without affecting the rest of the circuit. Input impedance is norminally
90KΩ.
13
VLC
Volume control input. When VLC=VB , the receive attenuator is at maximum gain when in the
receive mode. When VLC=0.3VB, the receive gain is down 35dB. Does not affect the
transmit mode.
14
CT
An RC at this pin sets the response time for the circuit to switch modes.
15
VB
An output voltage≈Vcc/2. This voltage is a system ac ground, and biases the volume control.
A filter cap is required
16
CPT
An RC at this pin sets the time constant for the transmit background monitor.
17
TLI2
Input to the transmit level detector on the mike/speaker side.
18
TLO2
Output of the transmit level detector on the mike/speaker side, and input to the transmit
background monitor.
19
RLO2
Output of the receive level detector on the mike/speaker side.
20
RLI2
Input to the receive level detector on the mike/speaker side.
21
RXI
Input to the receive attenuator and dial tone detector. Max input level is 350mV RMS. Input
impedance is ≈10KΩ.
22
RXO
Output of the receive attenuator. DC level is approximately VB.
23
TLI1
Input to the transmit level detector on the line side.
24
TLO1
Output of the transmit level detector on the line side.
25
RLO1
Output of the receive level detector on the line side, and input to the receive background
monitor.
26
RLI1
Input to the receive level detector on the line side.
27
CPR
An RC at this pin sets the time constant for the receive background monitor.
28
GND
Ground pin for the entire IC.


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