SL34118 datasheet(8/12 Pages) SLS

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SL34118

System Logic

Semiconductor

SLS

Pin No

Designation

Description

MUT

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 90

Ω.

VLC

Volume control input. When VLC = VB, the receive attenuator is at maximum gain

when in the receive mode. When VLC = 0.3 VB, 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.

CPT

An RC at this pin sets the time constant for the transmit background monitor.

TLI2

Input to the transmit level detector on the mike speaker side.

TLO2

Output of the transmit level detector on the mike/speaker side, and input to the

transmit background monitor.

RLO2

Output of the receive level detector on the mike/speaker side.

RLI2

Input to the receive level detector on the mike/speaker side.

RXI

Input to the receive attenuator and dial tone detector. Max input level is 350 mV

RMS. Input impedance is

≈10 KΩ.

RXO

Output of the receive attenuator. DC level is approximately VB.

TLI1

Input to the transmit level detector on the line side.

TLO1

Output of the transmit level detector on the line side.

RLO1

Output of the receive level detector on the line side, and input to the receive

background monitor.

RLI1

Input the receive level detector on the line side.

CPR

An RC at this pin sets the time constant for the receive background monitor.

GND

Ground pin for the entire IC.

MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

VCC

Supply Voltage (Pin 14)

-1.0 to +7.0

VIN

Input Voltage at CD(Pin 3), MUT (Pin 12)

-1.0 toVCC +1.0 V

VIN

Input Voltage at VLC (Pin 13)

-1.0 toVCC +0.5 V

VIN

Input Voltage at TXI(Pin 9), RXI (Pin 21), FI (Pin 2)

-0.5 toVCC +0.5 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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