Philips Semiconductors
Product specification
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
GENERAL DESCRIPTION
The TEA1064A 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 and has a powerful DC
supply for peripheral circuits. 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.
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 in two options:
unregulated supply, regulated line voltage;
stabilized supply, line voltage varies with supply
current
•
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 magnetic, dynamic 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
PACKAGE OUTLINES
TEA1064A
TEA1064A :20-lead DIL; plastic (SOT146).
(1)
TEA1064AT:20-lead mini-pack; plastic (SO20;
SOT163A).
(2)
Notes
1. SOT146-1; 1998 Jun 18.
2. SOT163-1; 1998 Jun 18.
March 1994
2
Philips Semiconductors
Product specification
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
QUICK REFERENCE DATA
PARAMETER
Operating ambient temperature
range
Line current operating range:
normal operation
with reduced performance
Internal supply current:
power-down input LOW
power-down input HIGH
Voltage gain range:
microphone amplifier
receiving amplifier
Line loss compensation:
gain control range
exchange supply voltage
range
exchange feeding bridge
resistance range
Maximum output voltage swing
on LN (peak-to-peak value)
R15
+
R16 = 448
Ω
l
line
= 15 mA
I
p
= 2 mA
I
p
= 4 mA
Regulated line voltage application
R15 = 0
Ω;
R16 = 392
Ω
Supply for peripherals
l
line
= 15 mA
I
p
= 1.4 mA
I
p
= 2.7 mA;
R
REG-SLPE
= 20 kΩ
DC line voltage
l
line
= 15 mA
without R
REG-SLPE
R
REG-SLPE
= 20 kΩ
V
LN
V
LN
−
−
3.57
4.57
V
p
2.9
−
V
p
2.5
−
V
LN(p-p)
V
LN(p-p)
3.7
3.0
3.95
3.25
R
exch
400
−
V
exch
36
−
G
v
5.7
6.1
G
v
G
v
44
20
−
−
V
CC1
= 2.8 V
V
CC1
= 2.8 V
I
CC1
I
CC1
−
−
1.3
60
l
line
l
line
11
2
−
−
T
amb
−25
−
CONDITIONS
SYMBOL
MIN.
TYP.
TEA1064A
MAX.
+
75
140
(1)
11
1.6
82
52
45
6.5
60
1000
UNIT
°C
mA
mA
mA
µA
dB
dB
dB
V
Ω
4.2
3.5
V
V
−
−
−
−
V
V
V
V
March 1994
4
Philips Semiconductors
Product specification
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
PARAMETER
Stabilized supply voltage application
R15 = 392
Ω;
R16 = 56
Ω
Supply for peripherals
DC line voltage
l
line
= 15 mA
I
p
= 0 to 4 mA
l
line
= 15 mA
I
p
= 2 mA
I
p
= 4 mA
Note
V
LN
V
LN
4.2
4.9
4.4
5.1
V
CC2-SLPE
3.05
3.3
CONDITIONS
SYMBOL
MIN.
TYP.
TEA1064A
MAX.
UNIT
3.55
4.8
5.5
V
V
V
1. For TEA1064AT the maximum line current depends on the heat dissipating qualities of the mounted device.
PINNING
1 LN
2 GAS1
handbook, halfpage
positive line terminal
gain adjustment; transmitting amplifier
gain adjustment; transmitting amplifier
inverting output, receiving amplifier
non-inverting output, receiving
amplifier
gain adjustment; receiving amplifier
decoupling for transmit amplifier
dynamic and microphone MUTE input
inverting microphone input
non-inverting microphone input
current stabilizer
negative line terminal
dual-tone multi-frequency input
receiving amplifier input
mute input
power-down input
internal supply decoupling
voltage regulator decoupling
automatic gain control input
reference voltage with respect to SLPE
slope adjustment for DC
curve/reference for peripheral circuits.
LN 1
GAS1 2
GAS2 3
QR− 4
QR+ 5
20 SLPE
19 VCC2
18 AGC
17 REG
16 VCC1
3 GAS2
4 QR−
5 QR+
6 GAR
7 DLS/
MMUTE
8 MIC−
9 MIC+
10 STAB
11 V
EE
12 DTMF
13 IR
14 MUTE
15 PD
16 V
CC1
17 REG
18 AGC
19 V
CC2
TEA1064A
GAR 6
DLS/MMUTE 7
MIC− 8
MIC+ 9
STAB 10
MGR057
15 PD
14 MUTE
13 IR
12 DTMF
11 VEE
Fig.2 Pinning diagram.
20 SLPE
March 1994
5