Philips TEA1113T Datasheet

INTEGRATED CIRCUITS

DATA SH EET

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

Philips Semiconductors Product specification

Low voltage versatile telephone
transmission circuit with dialler interface

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 kΩ) for

dynamic, magnetic or piezo-electric microphones

• Asymmetrical high impedance input (32 kΩ) 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

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.

TEA1113

machines and answering machines.

QUICK REFERENCE DATA

I

= 15 mA; VEE=0V; R

line

T

=25°C; unless otherwise specified.

amb

SLPE

=20Ω; C

= 470 nF; AGC pin connected to VEE; Z

DLS

= 600 Ω; f = 1 kHz;

line

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

I

line

line current operating range normal operation 11 − 140 mA

with reduced performance 1 − 11 mA

I

LED(max)

V

LN

V

LN(max)(p-p)

maximum supply current available I

=18 mA − 0.6 − mA

line

>76mA − 19.5 − mA

I

line

DC line voltage 3.7 4.0 4.3 V
maximum output voltage swing

3.8 4.65 − V

(peak-to-peak value)

I

CC

V
G

∆G

CC

vtrx

vtrx

internal current consumption VCC= 3.2 V − 1.3 1.6 mA
supply voltage for peripherals Ip= 0 mA 2.8 3.2 − V
typical voltage gain range

microphone amplifier V
receiving amplifier V

gain control range for microphone and

= 2 mV (RMS) 38.8 − 51.8 dB

MIC

= 4 mV (RMS) 19.3 − 31.3 dB

IR

I

=85mA − 5.8 − dB

line

receiving amplifiers with respect to
I

=15mA

line

∆G

vtxm

microphone amplifier gain reduction − 80 − dB

1997 Mar 27 2

Philips Semiconductors Product specification

Low voltage versatile telephone
transmission circuit with dialler interface

ORDERING INFORMATION

TYPE

NUMBER

TEA1113 DIP16
TEA1113T SO16

BLOCK DIAGRAM

handbook, full pagewidth

NAME DESCRIPTION VERSION

plastic dual in-line package; 16 leads (300 mil)
plastic small outline package; 16 leads; body width 3.9 mm

9

IR

V− I

PACKAGE

GAR

QR

15 14 8

MUTE

TEA1113

SOT38-4

SOT109-1

V

CC

16

DTMF

MIC+

MIC−

DLS/MMUTE

V− I

7

12

11

6

ATT.

DYNAMIC

LIMITER

V− I

V− I

AGC

CIRCUIT

REFERENCE

LOW VOLTAGE

CIRCUIT

CURRENT

1

LN

5

GAS

4

REG

TEA1113

LED

DRIVER

231013

V

EE

AGC

I

LED

MBG018

SLPE

Fig.1 Block diagram.

1997 Mar 27 3

Philips Semiconductors Product specification

Low voltage versatile telephone
transmission circuit with dialler interface

PINNING

SYMBOL PIN DESCRIPTION

LN 1 positive line terminal
SLPE 2 slope (DC resistance) adjustment
I

LED

REG 4 line voltage regulator decoupling
GAS 5 sending gain adjustment
DLS/

MMUTE
DTMF 7 dual-tone multi-frequency input
MUTE 8 mute input to select speech or

IR 9 receiving amplifier input
AGC 10 automatic gain control - line loss

MIC− 11 inverting microphone amplifier

MIC+ 12 non-inverting microphone amplifier

V

EE

QR 14 receiving amplifier output
GAR 15 receive gain adjustment
V

CC

3 available output current to drive an

LED

6 dynamic limiter timing adjustment

and microphone mute input

dialling mode (active LOW)

compensation

input

input

13 negative line terminal

16 supply voltage for speech circuit

and peripherals

handbook, halfpage

DLS/MMUTE

LN

1
2

SLPE

3

I

LED

4

REG

GAS

DTMF
MUTE

5
6
7
8

TEA1113

MBG015

Fig.2 Pin configuration.

V

16

CC

15

GAR

14

QR

13

V

EE

12

MIC+

11

MIC−

10

AGC

9

IR

TEA1113

FUNCTIONAL DESCRIPTION

All data given in this chapter are typical values, except
when otherwise specified.

Supply (pins LN, SLPE, V

and REG)

CC

The supply for the TEA1113 and its peripherals is obtained
from the telephone line.

The ICs generate a stabilized reference voltage (V

ref

)
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 R

VA

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 (C

) which is connected to VEE. This

REG

capacitor, converted into an equivalent inductance (see
Section “Set impedance”), realizes the set impedance
conversion from its DC value (R

) to its AC value

SLPE

1997 Mar 27 4

in the audio-frequency range). The voltage at pin

(R

CC

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:

V
I

I

V

LN

SLPEIlineICC

line

refRSLPEISLPE

– Ip– I∗– I

==

: line current

×+=

I+

LED

sh

ICC: current consumption of the IC
Ip: supply current for peripheral circuits
I*: current consumed between LN and V
I

: supply current for the LED component

LED

EE

Ish: the excess line current shunted to SLPE (and VEE)
via LN.

Philips Semiconductors Product specification

Low voltage versatile telephone

TEA1113

transmission circuit with dialler interface

The preferred value for R
microphone and DTMF gains, the LED supply current characteristic, the gain control characteristics, the sidetone level
and the maximum output swing on the line.

R

R

line

I

line

exch

V

exch

handbook, full pagewidth

is 20 Ω. Changing R

SLPE

I

LED

TEA1113

I

LED

DRIVER

LED

I

SLPE

will affect more than the DC characteristics; it also influences the

SLPE

R

CC

619 Ω

LN

from preamp

I

sh

SLPE

R

SLPE

20 Ω

REG

C

REG

4.7 µF

V

CC

I

CC

*

I

V

EE

C

VCC

100 µF

MBG019

peripheral

circuits

I

p

(1) RVA between REG and SLPE.
(2) No RVA.
(3) RVA between REG and LN.

5.5

handbook, halfpage

V

ref

(V)

4.5

3.5

2.5

4

10

Fig.3 Supply configuration.

(1)

(2)

(3)

5

10

6

10

RVA (Ω)

MGD188

7

10

Fig.4 Reference voltage adjustment by a RVA resistor.

1997 Mar 27 5

Philips Semiconductors Product specification

Low voltage versatile telephone
transmission circuit with dialler interface

The internal circuitry of the TEA1113 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 C
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 (see also Figs 5 and 6). R
impedance of the voltage supply point, and I
current consumed by the output stage of the earpiece
amplifier.

V

V

CC

CCO

V

CCORCCintIpIrec

VLNR

×–=

CCICC

The DC line current flowing into the set is determined by
the exchange supply voltage (V
resistance (R
(R

) and the reference voltage (V

line

), the DC resistance of the telephone line

exch

below 8 mA, the internal reference voltage (generating
V

) is automatically adjusted to a lower value. This means

ref

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 8 mA, the
circuit has limited sending and receiving levels. This is
called the low voltage area.

. It may also be used to

VCC

is the internal

CCint

rec

–()×–=

), the feeding bridge

exch

). With line currents

ref

is the

TEA1113

Set impedance

In the audio frequency range, the dynamic impedance is
mainly determined by the RCC resistor. The equivalent
impedance of the circuits is illustrated in Fig.7.

LED supply (pin I

The TEA1113 gives an on-hook/off-hook status indication.
This is achieved by a current made available to drive an
LED connected between pins I
voltage area, which corresponds to low line current
conditions, no current is available for this LED. For line
currents higher than a threshold current, the I
increases proportionally to the line current (with a ratio of
one third).The I
(see Fig.8).

For 17 mA < I

I

=

LED

line

I

17–

line

---------------------­3

This LED driver is referenced to SLPE. Consequently, all
the I

supply current will flow through the R

LED

The AGC characteristics are not disturbed (see Fig.3 for
the supply configuration).

Microphone amplifier (pins MIC+, MIC− and GAS)

)

LED

and LN. In the low

LED

LED

current is internally limited to 19.5 mA

LED

< 77 mA:

SLPE

current

resistor.

handbook, halfpage

V

R

CCO

Fig.5 VCC voltage supply for peripherals.

CCintVCC

V

EE

I

rec

PERIPHERAL

CIRCUIT

I

P

MBE792

The TEA1113 has symmetrical microphone inputs.
The input impedance between pins MIC+ and MIC− is
64 kΩ (2 × 32 kΩ). The voltage gain from pins MIC+/MIC−
to pin LN is set to 51.8 dB (typ). The gain can be
decreased by connecting an external resistor R

GAS

between pins GAS and REG. The adjustment range is
13 dB. A capacitor C

connected between pins GAS

GAS

and REG can be used to provide a first-order low-pass
filter. The cut-off frequency corresponds to the time
constant C

GAS

× (R

GASint

// R

GAS

). R

is the internal

GASint

resistor which sets the gain with a typical value of 69 kΩ.
Automatic gain control is provided on this amplifier for line

loss compensation.

Dynamic limiter and microphone mute
(pin DLS/

MMUTE)

The dynamic limiter only acts on the microphone channel,
this is to prevent clipping of the line signal. To prevent
distortion, the microphone gain is rapidly reduced when
peaks on the line signal exceed an internally determined
threshold level or when the current in the transmit output
stage is insufficient. The time in which the gain reduction
is realized is very short (attack time). The microphone
channel stays in the reduced gain condition until the peaks

1997 Mar 27 6