ts34118 Taiwan Semiconductor Company, Ltd. (TSC), ts34118 Datasheet - Page 5

• Manufacturer Part Number: ts34118
• Description: Voice Switched Speakerphone Circuit
• Manufacturer: Taiwan Semiconductor Company, Ltd. (TSC)

TS34118
Pin Function Description
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
3
4
5
6
7
8
9
Name
HTO+
RLO2
RLO1
HTO-
TLO2
TLO1
MCO
MUT
RLI2
RXO
RLI1
CPR
GND
TXO
CPT
TLI2
TLI1
MCI
VLC
Vcc
HTI
TXI
RXI
CD
FO
C
V
FI
B
T
Filter output. Output impedance is less than 50 ohms.
Filter input. Input impedance is greater than 1.0Mohm.
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 90K .
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).
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.
Output of the first hybrid amplifier. The gain of the amp is set by external resistors.
Input and summing node for the first hybrid amplifier . DC level is§V
Output of the transmit attenuator. DC level is approximately V
Input to the transmit attenuator. Max. Signal level is 350m Vrms . Input impedance is 10K .
Output of the microphone amplifier. The gain of the amplifier is set by external resistors.
Input and summing node of the microphone amplifier. DC level is§ V
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
90K .
Volume control input. When VLC=V
receive mode. When VLC=0.3V
mode.
An RC at this pin sets the response time for the circuit to switch modes.
An output voltage§Vcc/2. This voltage is a system ac ground, and biases the volume control. A
filter cap is required
An RC at this pin sets the time constant for the transmit background monitor.
Input to the transmit level detector on the mike/speaker side.
Output of the transmit level detector on the mike/speaker side, and input to the transmit
background monitor.
Output of the receive level detector on the mike/speaker side.
Input to the receive level detector on the mike/speaker side.
Input to the receive attenuator and dial tone detector. Max input level is 350mV RMS. Input
impedance is §10K .
Output of the receive attenuator. DC level is approximately V
Input to the transmit level detector on the line side.
Output of the transmit level detector on the line side.
Output of the receive level detector on the line side, and input to the receive background
monitor.
Input to the receive level detector on the line side.
An RC at this pin sets the time constant for the receive background monitor.
Ground pin for the entire IC.
5-20
B
, the receive gain is down 35dB. Does not affect the transmit
B
, the receive attenuator is at maximum gain when in the
Description
B
B.
.
2004/09 rev. B
B.
B.