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NXP Semiconductors |
INTEGRATED CIRCUITS
DATA SHEET
TEA1064B
Low voltage versatile telephone
transmission circuit with dialler
interface and transmit level
dynamic limiting
Product specification
File under Integrated Circuits, IC03A
March 1994
Philips Semiconductors
Product specification
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
TEA1064B
FEATURES
• Low DC line voltage; operates down to 1.8 V (excluding
polarity guard)
• Voltage regulator with low voltage drop and adjustable
static resistance
• DC line voltage adjustment facility
• Provides a supply for external circuits
• Dynamic limiting (speech-controlled) in transmit
direction prevents distortion of line signal and sidetone
• Symmetrical high-impedance inputs (64 kΩ) for
dynamic, magnetic or piezo-electric microphones
• Asymmetrical high-impedance input (32 kΩ) for electret
microphones
• DTMF signal input
• Confidence tone in the earpiece during DTMF dialling
• Mute input for disabling speech during pulse or DTMF
dialling
• Power-down input for improved performance during
pulse dial or register recall (flash)
• Receiving amplifier for dynamic, magnetic or
piezo-electric earpieces
• Large amplification setting ranges on microphone and
earpiece amplifiers
• Line loss compensation (line current dependent) for
microphone and earpiece amplifiers (not used for DTMF
amplifier)
• Gain control curve adaptable to exchange supply
• Automatic disabling of the DTMF amplifier in
extremely-low voltage conditions
• Microphone MUTE function available with switch
• MUTE, POWER-DOWN and DTMF input reference (pin
VEE2) can be connected either to VEE1 or SLPE.
GENERAL DESCRIPTION
The TEA1064B is a bipolar integrated circuit that performs
all the speech and line interface functions required in fully
electronic telephone sets. It performs electronic switching
between dialling and speech. The IC operates at line
voltages down to 1.8 V DC (with reduced performance) to
facilitate the use of more telephone sets connected in
parallel. The transmit signal on the line is dynamically
limited (speech-controlled) to prevent distortion at high
transmit levels of both the sending signal and the sidetone.
ORDERING INFORMATION
EXTENDED TYPE
NUMBER
TEA1064B
TEA1064BT
PINS
20
20
Notes
1. SOT146-1; 1998 Jun 18.
2. SOT163-1; 1998 Jun 18.
PIN POSITION
DIL
mini-pack
PACKAGE
MATERIAL
plastic
plastic
CODE
SOT146(1)
SO20; SOT163A(2)
March 1994
2
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