Philips TEA1113T-C1, TEA1113-C1 Datasheet

DATA SH EET

Product speciﬁcation Supersedes data of 1996 Feb 08 File under Integrated Circuits, IC03

1997 Mar 27

INTEGRATED CIRCUITS

TEA1113

Low voltage versatile telephone transmission circuit with dialler interface

1997 Mar 27 2

Philips Semiconductors Product speciﬁcation

Low voltage versatile telephone transmission circuit with dialler interface

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 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 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

line

= 15 mA; VEE=0V; R

SLPE

=20Ω; C

DLS

= 470 nF; AGC pin connected to VEE; Z

line

= 600 Ω; f = 1 kHz;

amb

=25°C; unless otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

line

line current operating range normal operation 11 − 140 mA

with reduced performance 1 − 11 mA

LED(max)

maximum supply current available I

line

=18 mA − 0.6 − mA

line

>76mA − 19.5 − mA

DC line voltage 3.7 4.0 4.3 V

LN(max)(p-p)

maximum output voltage swing (peak-to-peak value)

3.8 4.65 − V

internal current consumption VCC= 3.2 V − 1.3 1.6 mA

supply voltage for peripherals Ip= 0 mA 2.8 3.2 − V

vtrx

typical voltage gain range

microphone amplifier V

MIC

= 2 mV (RMS) 38.8 − 51.8 dB

receiving amplifier V

= 4 mV (RMS) 19.3 − 31.3 dB

∆G

vtrx

gain control range for microphone and receiving amplifiers with respect to I

line

=15mA

line

=85mA − 5.8 − dB

∆G

vtxm

microphone ampliﬁer gain reduction − 80 − dB

1997 Mar 27 3

Philips Semiconductors Product speciﬁcation

Low voltage versatile telephone transmission circuit with dialler interface

TEA1113

ORDERING INFORMATION

BLOCK DIAGRAM

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TEA1113 DIP16

plastic dual in-line package; 16 leads (300 mil)

SOT38-4

TEA1113T SO16

plastic small outline package; 16 leads; body width 3.9 mm

SOT109-1

Fig.1 Block diagram.

handbook, full pagewidth

ATT.

DTMF

V− I

DYNAMIC

LIMITER

AGC

CIRCUIT

CURRENT

REFERENCE

LOW VOLTAGE

CIRCUIT

LED

DRIVER

MIC+

MIC−

DLS/MMUTE

LED

AGC

SLPE

TEA1113

231013

15 14 8

GAS

GAR

REG

MUTE

V− I

MBG018

1997 Mar 27 4

Philips Semiconductors Product speciﬁcation

Low voltage versatile telephone transmission circuit with dialler interface

TEA1113

PINNING

SYMBOL PIN DESCRIPTION

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

LED

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 V

13 negative line terminal QR 14 receiving ampliﬁer output GAR 15 receive gain adjustment V

16 supply voltage for speech circuit

and peripherals

Fig.2 Pin configuration.

handbook, halfpage

TEA1113

MBG015

1 2 3 4 5 6 7 8

16 15 14 13 12 11 10

GAR QR V

MIC+ MIC− AGC IR

SLPE

LED

REG

GAS

DLS/MMUTE

DTMF MUTE

FUNCTIONAL DESCRIPTION

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

Supply (pins LN, SLPE, V

and REG)

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

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

REG

) 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 (R

SLPE

) to its AC value

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:

line

: line current

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

LED

: supply current for the LED component

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

refRSLPEISLPE

×+=

SLPEIlineICC

– Ip– I∗– I

LED

I+

1997 Mar 27 5

Philips Semiconductors Product speciﬁcation

Low voltage versatile telephone transmission circuit with dialler interface

TEA1113

The preferred value for R

SLPE

is 20 Ω. Changing R

SLPE

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.

Fig.3 Supply configuration.

handbook, full pagewidth

LED

DRIVER

SLPE

REG

SLPE

VCC

REG

SLPE

exch

LED

line

TEA1113

peripheral

circuits

100 µF

4.7 µF

20 Ω

619 Ω

MBG019

from preamp

Fig.4 Reference voltage adjustment by a RVA resistor.

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

handbook, halfpage

5.5

ref

(V)

2.5

3.5

4.5

RVA (Ω)

MGD188

(1)

(2)

(3)

1997 Mar 27 6

Philips Semiconductors Product speciﬁcation

Low voltage versatile telephone transmission circuit with dialler interface

TEA1113

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

VCC

. 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 (see also Figs 5 and 6). R

CCint

is the internal

impedance of the voltage supply point, and I

rec

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 (V

exch

), the feeding bridge

resistance (R

exch

), the DC resistance of the telephone line

line

) and the reference voltage (V

ref

). With line currents below 8 mA, the internal reference voltage (generating V

ref

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

CCORCCintIpIrec

–()×–=

CCO

VLNR

CCICC

×–=

handbook, halfpage

PERIPHERAL

CIRCUIT

rec

CCintVCC

CCO

MBE792

Fig.5 VCC voltage supply for peripherals.

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

LED

)

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

LED

and LN. In the low 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

LED

current increases proportionally to the line current (with a ratio of one third).The I

LED

current is internally limited to 19.5 mA

(see Fig.8). For 17 mA < I

line

< 77 mA:

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

LED

supply current will flow through the R

SLPE

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

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

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

GAS

connected between pins 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

GASint

is the internal

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

LED

line

17–

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