GENERAL DESCRIPTION

The BL1062A1 is integrated circuits that perform all speech and line interface functions required in fully electronic telephone sets. It performs 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. BL1062A1 improves the EMC performance in-circuit that can enhance the telephone sets’ EMC.

FEATURES

● 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

● Symmetrical high-impedance inputs (64 Κ Ω ) for dynamic, magnetic or piezoelectric microphones

● Asymmetrical high-impedance input (32 ΚΩ ) for electret microphones

● DTMF signal input with confidence tone

● Mute input for pulse or DTMF dialling, active LOW (MUTE)

● Receiving amplifier for dynamic, magnetic or piezoelectric 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

● Enhanced EMC performanc