BL1062A1
Low voltage transmission circuits with dialer interface
1.
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.
2.
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
3.
BLOCK DIAGRAM
Fig. 1 Block Diagram
http://www.belling.com.cn
-1-
8/25/2006
Wrote by 2006
Total
7 Pages
BELLING [ SHANGHAI BELLING CO., LTD. ]
