Philips Semiconductors
Versatile telephone transmission circuit
with dialler interface
Product specification
TEA1066T
FEATURES
• Voltage regulator with adjustable static resistance
• Provides supply for external circuitry
• Symmetrical low-impedance inputs for dynamic and
magnetic microphones
• Symmetrical high-impedance inputs for piezoelectric
microphone
• Asymmetrical high-impedance input for electret
microphone
• Dual-tone multi-frequency (DTMF) signal input with
confidence tone
• Mute input for pulse or DTMF dialling
• Power down input for pulse dial or register recall
• Receiving amplifier for magnetic, dynamic or
piezoelectric earpieces
• Large gain setting range on microphone and earpiece
amplifiers
• Line loss compensation facility, line current dependent
(microphone and earpiece amplifiers)
• Gain control adaptable to exchange supply
• DC line voltage adjustment facility.
GENERAL DESCRIPTION
The TEA1066T is a bipolar integrated circuit that performs
all speech and line interface functions required in fully
electronic telephone sets. The circuit performs electronic
switching between dialling and speech.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
VLN
line voltage
Iline
line current
ICC
internal supply current
Iline = 15 mA
normal operation
power down input LOW
power down input HIGH
VCC
supply voltage for peripherals
Iline = 15 mA; MUTE
input HIGH; Ip = 1.2 mA
Iline = 15 mA; MUTE
input HIGH; Ip = 1.7 mA
Gv
voltage gain range for microphone amplifier
low impedance inputs (pins 7 and 9)
high impedance inputs (pins 8 and 10)
receiving amplifier
Tamb
operating ambient temperature
Line loss compensation
∆Gv
Vexch
Rexch
gain control
exchange supply voltage
exchange feeding bridge resistance
MIN.
4.25
10
−
−
2.8
TYP.
4.45
−
0.96
55
3.05
MAX. UNIT
4.65 V
140 mA
1.3 mA
82 µA
−
V
2.5 −
−
V
44 −
30 −
17 −
−25 −
60 dB
46 dB
39 dB
+75 °C
5.5 5.9
24 −
400 −
6.3 dB
60 V
1000 Ω
ORDERING INFORMATION
TYPE
NUMBER
TEA1066T
NAME
SO20
PACKAGE
DESCRIPTION
plastic small outline package; 20 leads; body width 7.5 mm
VERSION
SOT163-1
1996 Apr 04
2