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INTEGRATED CIRCUITS
DATA SHEET
TEA1110A
Low voltage versatile telephone
transmission circuit with dialler
interface
Product specification
Supersedes data of 1996 Nov 26
File under Integrated Circuits, IC03
1997 Apr 22

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Philips Semiconductors
Low voltage versatile telephone
transmission circuit with dialler interface
Product specification
TEA1110A
FEATURES
Low DC line voltage; operates down to 1.6 V (excluding
voltage drop over external 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
AGC line loss compensation for microphone and
earpiece amplifiers.
APPLICATION
Line powered telephone sets, cordless telephones, fax
machines, answering machines.
GENERAL DESCRIPTION
The TEA1110A 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.
All statements and values refer to all versions unless
otherwise specified.
QUICK REFERENCE DATA
Iline = 15 mA; VEE = 0 V; RSLPE = 20 ; AGC pin connected to VEE; Zline = 600 ; f = 1 kHz; Tamb = 25 °C;
unless otherwise specified.
SYMBOL
Iline
VLN
ICC
VCC
Gvtrx
Gvtrx
Gvtrxm
PARAMETER
line current operating range
DC line voltage
internal current consumption
supply voltage for peripherals
typical voltage gain
microphone amplifier (not adjustable)
receiving amplifier range
gain control range for microphone and
receiving amplifiers with respect to
Iline = 15 mA
gain reduction for microphone and
receiving amplifiers
CONDITIONS
MIN.
normal operation
11
with reduced performance 1
3.35
VCC = 2.9 V
IP = 0 mA
VMIC = 4 mV (RMS)
VIR = 4 mV (RMS)
Iline = 85 mA
19
MUTE = LOW
TYP.
3.65
1.1
2.9
43.7
5.9
80
MAX. UNIT
140 mA
11 mA
3.95 V
1.4 mA
V
dB
33 dB
dB
dB
ORDERING INFORMATION
TYPE
NUMBER
TEA1110A
TEA1110AT
NAME
DIP14
SO14
PACKAGE
DESCRIPTION
plastic dual in-line package; 14 leads (300 mil)
plastic small outline package; 14 leads; body width 3.9 mm
VERSION
SOT27-1
SOT108-1
1997 Apr 22
2

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Philips Semiconductors
Low voltage versatile telephone
transmission circuit with dialler interface
BLOCK DIAGRAM
Product specification
TEA1110A
handbook, full pagewidth
IR 7
VI
DTMF
VI
5
ATT.
VI
MIC+ 10
9
MIC
VI
GAR
13
QR MUTE
12 6
CURRENT
REFERENCE
14 VCC
1 LN
3 REG
11
VEE
AGC
CIRCUIT
LOW VOLTAGE
CIRCUIT
TEA1110A(T)
8
AGC
2
SLPE
MGG736
1997 Apr 22
Fig.1 Block diagram.
3

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Philips Semiconductors
Low voltage versatile telephone
transmission circuit with dialler interface
Product specification
TEA1110A
PINNING
SYMBOL PIN
DESCRIPTION
LN 1 positive line terminal
SLPE
2 slope (DC resistance) adjustment
REG
3 line voltage regulator decoupling
n.c. 4 not connected
DTMF
5 dual-tone multi-frequency input
MUTE
6 mute input to select speech or
dialling mode (active LOW)
IR 7 receiving amplifier input
AGC
8 automatic gain control/
line loss compensation
MIC
MIC+
9 inverting microphone amplifier input
10 non-inverting microphone amplifier
input
VEE 11 negative line terminal
QR 12 receiving amplifier output
GAR
13 receive gain adjustment
VCC 14 supply voltage for speech circuit and
peripherals
handbook, halfpage
LN 1
SLPE 2
14 VCC
13 GAR
REG 3
12 QR
n.c. 4 TEA1110A(T) 11 VEE
DTMF 5
10 MIC+
MUTE 6
9 MIC
IR 7
8 AGC
MGG735
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 TEA1110A and its peripherals is
obtained from the telephone line. See Fig.3.
The IC generates a stabilized reference voltage (Vref)
between pins LN and SLPE. Vref is temperature
compensated and can be adjusted by means of an
external resistor (RVA). Vref equals 3.35 V and can be
increased by connecting RVA between pins REG
and SLPE (see Fig.4), or decreased by connecting RVA
between pins REG and LN. The voltage at pin REG is
used by the internal regulator to generate Vref and is
decoupled by 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.
The voltage at pin LN is:
VLN = Vref + RSLPE × ISLPE
ISLPE = Iline ICC IP I
Where:
Iline = line current
ICC = current consumption of the IC
IP = supply current for peripheral circuits
I* = current consumed between LN and VEE.
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 gain control
characteristics, the sidetone level and the maximum
output swing on the line.
1997 Apr 22
4

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Philips Semiconductors
Low voltage versatile telephone
transmission circuit with dialler interface
Product specification
TEA1110A
handbook, full pagewidth
Rline
Iline
LN
1
Rexch
Ish
Vexch
Vd
ISLPE
2
SLPE
RSLPE
20
RCC
619
from pre amp
I*
VCC
14
ICC
TEA1110A
3
REG
CREG
4.7 µF
11
VEE
Fig.3 Supply configuration.
IP
CVCC peripheral
100 µF circuits
MGG737
The internal circuitry of the TEA1110A is supplied from
pin VCC. This voltage supply is derived from the line
voltage by means of a resistor (RCC) and must be
decoupled by a capacitor CVCC. It may also be used to
supply peripheral circuits such as dialling or control
circuits. The VCC voltage depends on the current
consumed by the IC and the peripheral circuits as shown
by the formula:
VCC = VCC0 RCCint × (IP Irec)
VCC0 = VLN RCC × ICC (see also Figs 5 and 6).
RCCint is the internal equivalent resistance of the voltage
supply, and Irec is the current consumed by the output
stage of the earpiece amplifier.
The DC line current flowing into the set is determined by
the exchange supply voltage (Vexch), the feeding bridge
resistance (Rexch), the DC resistance of the telephone line
(Rline) and the reference voltage (Vref). With line currents
below 7.5 mA, the internal reference voltage (generating
Vref) is automatically adjusted to a lower value. This means
that more sets can operate in parallel with DC line voltages
(excluding the polarity guard) down to an absolute
minimum voltage of 1.6 V. At currents below 7.5 mA, the
circuit has limited sending and receiving levels. This is
called the low voltage area.
handbook6, .h0alfpage
Vref
(V)
5.0
MGD176
4.0
3.0
104
(1)
(2)
105
106 107
RVA ()
(1) Influence of RVA on Vref.
(2) Vref without influence of RVA.
Fig.4 Reference voltage adjustment by RVA.
1997 Apr 22
5