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INTEGRATED CIRCUITS
DATA SHEET
TEA1113
Low voltage versatile telephone
transmission circuit with dialler
interface
Product specification
Supersedes data of 1996 Feb 08
File under Integrated Circuits, IC03
1997 Mar 27

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Philips Semiconductors
Low voltage versatile telephone
transmission circuit with dialler interface
Product specification
TEA1113
FEATURES
Low DC line voltage; operates down to 1.6 V (excluding
polarity guard)
Voltage regulator with adjustable DC voltage
Provides a supply for external circuits
Symmetrical high impedance inputs (64 k) for
dynamic, magnetic or piezo-electric microphones
Asymmetrical high impedance input (32 k) for electret
microphones
DTMF input with confidence tone
MUTE input for pulse or DTMF dialling
Receiving amplifier for dynamic, magnetic or
piezo-electric earpieces
Dynamic limitation in the transmit direction to prevent
distortion of the transmit line and sidetone signals
AGC line loss compensation for microphone and
earpiece amplifiers
LED on-hook/off-hook status indication
Microphone mute function available with switch.
APPLICATION
Line powered telephone sets, cordless telephones, fax
machines and answering machines.
GENERAL DESCRIPTION
The TEA1113 is a bipolar integrated circuit that performs
all speech and line interface functions required in fully
electronic telephone sets. It performs electronic switching
between speech and dialling. The IC operates at a line
voltage down to 1.6 V DC (with reduced performance) to
facilitate the use of telephone sets connected in parallel.
A current (proportional to the line current and internally
limited to 19.5 mA) is available to drive an LED which
indicates the on-hook/off-hook status.
The transmit signal on the line is dynamically limited to
prevent distortion at high transmit levels for both the
sending line and sidetone signals. The microphone
amplifier can be disabled during speech condition by
means of a microphone mute function.
All statements and values refer to all versions unless
otherwise specified.
QUICK REFERENCE DATA
Iline = 15 mA; VEE = 0 V; RSLPE = 20 ; CDLS = 470 nF; AGC pin connected to VEE; Zline = 600 ; f = 1 kHz;
Tamb = 25 °C; unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Iline line current operating range
ILED(max)
maximum supply current available
VLN
VLN(max)(p-p)
DC line voltage
maximum output voltage swing
(peak-to-peak value)
normal operation
with reduced performance
Iline = 18 mA
Iline > 76 mA
11
1
3.7
3.8
140
11
0.6
19.5
4.0 4.3
4.65
mA
mA
mA
mA
V
V
ICC
VCC
Gvtrx
Gvtrx
Gvtxm
internal current consumption
supply voltage for peripherals
typical voltage gain range
microphone amplifier
receiving amplifier
gain control range for microphone and
receiving amplifiers with respect to
Iline = 15 mA
microphone amplifier gain reduction
VCC = 3.2 V
Ip = 0 mA
VMIC = 2 mV (RMS)
VIR = 4 mV (RMS)
Iline = 85 mA
1.3 1.6 mA
2.8 3.2
V
38.8
19.3
5.8
51.8 dB
31.3 dB
dB
80 dB
1997 Mar 27
2

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Philips Semiconductors
Low voltage versatile telephone
transmission circuit with dialler interface
Product specification
TEA1113
ORDERING INFORMATION
TYPE
NUMBER
TEA1113
TEA1113T
NAME
DIP16
SO16
PACKAGE
DESCRIPTION
plastic dual in-line package; 16 leads (300 mil)
plastic small outline package; 16 leads; body width 3.9 mm
VERSION
SOT38-4
SOT109-1
BLOCK DIAGRAM
handbook, full pagewidth
IR 9
VI
7
DTMF
MIC+
MIC
12
11
ATT.
VI
VI
VI
GAR
15
QR MUTE
14 8
CURRENT
REFERENCE
16 VCC
1
LN
5
GAS
4 REG
DLS/MMUTE 6
DYNAMIC
LIMITER
AGC
CIRCUIT
LOW VOLTAGE
CIRCUIT
LED
DRIVER
13
VEE
10
AGC
3
ILED
TEA1113
2
SLPE
MBG018
1997 Mar 27
Fig.1 Block diagram.
3

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Philips Semiconductors
Low voltage versatile telephone
transmission circuit with dialler interface
Product specification
TEA1113
PINNING
SYMBOL PIN
DESCRIPTION
LN 1 positive line terminal
SLPE
2 slope (DC resistance) adjustment
ILED 3 available output current to drive an
LED
REG
4 line voltage regulator decoupling
GAS
5 sending gain adjustment
DLS/
MMUTE
6 dynamic limiter timing adjustment
and microphone mute input
DTMF
7 dual-tone multi-frequency input
MUTE
8 mute input to select speech or
dialling mode (active LOW)
IR 9 receiving amplifier input
AGC
10 automatic gain control - line loss
compensation
MIC
11 inverting microphone amplifier
input
MIC+
12 non-inverting microphone amplifier
input
VEE 13 negative line terminal
QR 14 receiving amplifier output
GAR
15 receive gain adjustment
VCC 16 supply voltage for speech circuit
and peripherals
handbook, halfpage
LN 1
SLPE 2
16 VCC
15 GAR
ILED 3
REG 4
GAS 5
14 QR
13 VEE
TEA1113
12 MIC+
DLS/MMUTE 6
11 MIC
DTMF 7
10 AGC
MUTE 8
9 IR
MBG015
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
All data given in this chapter are typical values, except
when otherwise specified.
Supply (pins LN, SLPE, VCC and REG)
The supply for the TEA1113 and its peripherals is obtained
from the telephone line.
The ICs generate a stabilized reference voltage (Vref)
between pins LN and SLPE. This reference voltage is
equal to 3.7 V, is temperature compensated and can be
adjusted by means of an external resistor (RVA). It can be
increased by connecting the RVA resistor between
pins REG and SLPE, or decreased by connecting the RVA
resistor between pins REG and LN. The voltage at
pin REG is used by the internal regulator to generate the
stabilized reference voltage and is decoupled by a
capacitor (CREG) which is connected to VEE. This
capacitor, converted into an equivalent inductance (see
Section “Set impedance”), realizes the set impedance
conversion from its DC value (RSLPE) to its AC value
(RCC in the audio-frequency range). The voltage at pin
SLPE is proportional to the line current. Figure 3 illustrates
the supply configuration.
The IC regulates the line voltage at the pin LN, and it can
be calculated as follows:
VLN = Vref + RSLPE × ISLPE
ISLPE
=
Iline ICC Ip I
=
ILED
+
I
sh
Iline: line current
ICC: current consumption of the IC
Ip: supply current for peripheral circuits
I*: current consumed between LN and VEE
ILED: supply current for the LED component
Ish: the excess line current shunted to SLPE (and VEE)
via LN.
1997 Mar 27
4

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Philips Semiconductors
Low voltage versatile telephone
transmission circuit with dialler interface
Product specification
TEA1113
The preferred value for RSLPE is 20 . Changing RSLPE will affect more than the DC characteristics; it also influences the
microphone and DTMF gains, the LED supply current characteristic, the gain control characteristics, the sidetone level
and the maximum output swing on the line.
handbook, full pagewidthRline
Iline
ILED
LN
Rexch
Vexch
TEA1113
ILED
Ish
LED
DRIVER
ISLPE
SLPE
RSLPE
20
RCC
619
from preamp
I*
VCC
ICC
REG
CREG
4.7 µF
VEE
Fig.3 Supply configuration.
CVCC
100 µF
Ip
peripheral
circuits
MBG019
5.5
handbook, halfpage
Vref
(V)
4.5
(1)
(2)
3.5
(3)
MGD188
2.5
104 105 106 RVA () 107
(1) RVA between REG and SLPE.
(2) No RVA.
(3) RVA between REG and LN.
Fig.4 Reference voltage adjustment by a RVA resistor.
1997 Mar 27
5