LOW VOLTAGE TELEPHONE
TRANSMISSION CIRCUIT WITH
The UTC TEA1062/1062A is a bipolar integrated
circuit performing all speech and line interface
function, required in the fully electronic
telephone sets. It performs electronic switching
between dialing speech. The circuit is able to
operate down to D.C. line voltage of 1.6V (with
reduced performance) to facilitate the use of more
telephone sets in parallel.
* Low d.c. line voltage; operates down to 1.6V
(excluding polarity guard).
*Voltage regulator with adjustment static resistance.
*Provides supply with limited current for external
*Symmetrical high-impedance inputs (64kΩ)for
dynamic, magnetic or piezoelectric microphones.
*Asymmetrical high-impedance inputs (32kΩ)for
*DTMF signal input with confidence tone.
*Mute input for pulse or DTMF dialing.
*Receivering amplifier for several types of earphones.
*Large amplification setting range on microphone
and earpiece amplifiers.
*Line loss compensation facility , line current
depedant (microphone and earpiece amplifiers).
*Gain control adaptable to exchange supply.
*Possibility to adjust the d.c. line voltage.
QUICK REFERENCE DATA
Line voltage at Iline=15mA
Line current operating range[pin1]
with reduced performance
Internal supply current
Supply current for peripherials
at Iline=15 mA MUTE input LOW(1062 is HIGH)
Voltage amplification range
Line loss compansation
Amplification control range
Exchange supply voltage range
Exchange feeding bridge resistance range
Operating ambient temperature range
typ. 3.8 V
11 to 140 mA
1 to 11 mA
44 to 52 dB
20 to 39 dB
typ. 6 dB
36 to 60V
400 to 1000¦ ¸
-25 to +75°C
UTC UNISONIC TECHNOLOGIES CO., LTD. 1