SL1062A

System Logic

Semiconductor

SLS

Low Voltage Transmission Circuit

with Dialler Interface

The SL1062A is an integrated circuit that perform all speech and line

interface functions required in fully electronic telephone sets. They

perform electronic switching between dialling and speech. The ICs

operate at line voltage down to 1.6 V DC (with reduced performance)

to facilitate the use of more telephone sets connected in parallel.

• Low DC line voltage: operates down to 1.6 V (excluding polarity

guard)

• Voltage regulator with adjustable static resistance

• Provides a supply for external circuits

• Symmertical high-impedance inputs (64 KΩ) for dynamic,

magnetic or piezo-electric microphones

• Asymmetrical high-impedance input (32 KΩ) for electret

microphones

• DTMF signal input with confidence tone

• Mute input for pulse or DTMF dialing:

active LOW (MUTE)

• Receiving amplifier for dynamic, magnetic or piezo-electric

earpieces

• Large gain setting ranges on microphone and earpiece amplifiers

• Line loss compensation (line current dependent) for microphone

and earpiece amplifiers

• Gain control curve adaptable to exchange supply

• DC line voltage adjustment facility

ORDERING INFORMATION

SL1062AN Plastic

° to 75° C

for package

PIN ASSIGNMENT

BLOCK DIAGRAM