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INTEGRATED CIRCUITS
DATA SHEET
TEA1114A
Low voltage telephone
transmission circuit with dialler
interface and regulated strong
supply
Product specification
Supersedes data of 1999 Sep 14
File under Integrated Circuits, IC03
2000 Mar 21

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Philips Semiconductors
Low voltage telephone transmission circuit with
dialler interface and regulated strong supply
Product specification
TEA1114A
FEATURES
Low DC line voltage; operates down to 1.45 V
(excluding voltage drop over external polarity guard)
Line voltage regulator with adjustable DC voltage
3.3 V regulated strong supply point for peripheral
circuits compatible with:
– Speech mode
– Ringer mode
– Trickle mode.
Transmit stage with:
– Microphone amplifier with symmetrical high
impedance inputs
– DTMF amplifier with confidence tone on receive
output.
Receive stage with:
– Receive amplifier with asymmetrical output
– Earpiece amplifier with adjustable gain (and gain
boost facility) for all types of earpieces.
MUTE input for pulse or DTMF dialling
AGC line loss compensation for microphone and receive
amplifiers.
APPLICATIONS
Line powered telephone sets with LCD module
Cordless telephones
Fax machines
Answering machines.
GENERAL DESCRIPTION
The TEA1114A 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 1.45 V DC (with reduced performance) to
facilitate the use of telephone sets connected in parallel.
When the line current is high enough, a fixed amount of
current is derived from the LN pin in order to create a
strong supply point at pin VDD. The voltage at pin VDD is
regulated to 3.3 V to supply peripherals such as dialler,
LCD module and microcontroller.
ORDERING INFORMATION
TYPE
NUMBER
TEA1114A
TEA1114AT
TEA1114AUH
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
bare die; on foil
VERSION
SOT38-4
SOT109-1
2000 Mar 21
2

No Preview Available !

Philips Semiconductors
Low voltage telephone transmission circuit with
dialler interface and regulated strong supply
Product specification
TEA1114A
QUICK REFERENCE DATA
Iline = 15 mA; VEE = 0 V; RSLPE = 20 ; AGC pin connected to VEE; Zline = 600 ; f = 1 kHz; measured according to test
circuits given in Figs 15, 16 and 17; Tamb = 25 °C for TEA1114A(T); Tj = 25 °C for TEA1114AUH; unless otherwise
specified.
SYMBOL
Iline
VLN
ICC
VCC
VDD
IDD
Gv(TX)
Gv(RX)
Gv(QR)
Gv(trx)
Gv(trx)(m)
PARAMETER
CONDITIONS
line current operating range
normal operation
with reduced performance
DC line voltage
internal current consumption
supply voltage for internal circuitry
(unregulated)
VCC = 3.6 V
IP = 0 mA
regulated supply voltage for peripherals
speech mode
ringer mode
available supply current for peripherals
IDD = 3 mA
IDD = 75 mA
typical voltage gain for microphone
amplifier
VMIC = 4 mV (RMS)
typical voltage gain for receiving amplifier
gain setting range for earpiece amplifier
gain control range for microphone and
receive amplifiers with respect to
Iline = 15 mA
gain reduction for microphone and receive
amplifiers
VIR = 4 mV (RMS)
RE1 = 100 k
Iline = 85 mA
MUTE = LOW
MIN.
11
1
4.05
3.0
3.0
43.2
32.4
14
TYP.
4.35
1.25
3.6
3.3
3.3
44.2
33.4
6.0
80
MAX. UNIT
140 mA
11 mA
4.65 V
1.5 mA
V
3.6 V
3.6 V
3 mA
45.2 dB
34.4 dB
+12 dB
dB
dB
2000 Mar 21
3