IL34118 Datasheet, PDF (8/12 Pages) Integral Corp. – Voice Switched Speakerphone Circuit

IL34118
Pin No
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Designation
MUT
VLC
C_T
V_B
CPT
TLI2
TLO2
RLO2
RLI2
RXI
RXO
TLI1
TLO1
RLO1
RLI1
CPR
GND
Description
Mute input. A logic low (<0.8 V) sets normal operation. A logic high (>2.0 V)
mutes the microphone amplifier without affecting the rest of the circuit. Input
impedance is nominally 90Ω.
Volume control input. When VLC = V_B, the receive attenuator is at maximum gain
when in the receive mode. When VLC = 0.3 V_B, the receive gain is down 35 dB.
Does not affect the transmit mode.
An RC this pin sets the response time for the circuit to switch modes.
An output voltage ≈V_CC/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 350 mV
RMS. Input impedance is ≈10 KΩ.
Output of the receive attenuator. DC level is approximately V_B.
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 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.
MAXIMUM RATINGS^*
Symbol
Parameter
Value
Unit
V_CC Supply Voltage (Pin 14)
-1.0 to +7.0
V
V_IN Input Voltage at CD(Pin 3), MUT (Pin 12)
-1.0 toV_CC +1.0 V
V
V_IN Input Voltage at VLC (Pin 13)
-1.0 toV_CC +0.5 V
V
V_IN Input Voltage at TXI(Pin 9), RXI (Pin 21), FI (Pin 2)
-0.5 toV_CC +0.5 V
V
Tstg Storage Temperature Range
-65 to +150
°C
* _{Maximum Ratings are those values beyond which damage to the device may occur.}
Functional operation should be restricted to the Recommended Operating Conditions.
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