Philips TEA1118, TEA1118A User Guide

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INTEGRATED CIRCUITS

DATA SH EET

TEA1118; TEA1118A

Versatile cordless transmisssion circuit

Product speciﬁcation Supersedes data of 1996 Nov 26 File under Integrated Circuits, IC03

1997 Jul 14

Philips Semiconductors Product speciﬁcation

Versatile cordless transmisssion circuit TEA1118; TEA1118A

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 transmit inputs (62.5 kΩ)

with large signals handling capabilities [up to 1 V (RMS value) with less than 2% THD]

• Receive amplifier for dynamic, magnetic or piezoelectric earpieces

• AGC line loss compensation for transmit and earpiece amplifiers

• DTMF input with confidence tone (TEA1118A only)

• MUTE input for pulse or DTMF dialling (TEA1118A only)

• Transmit mute function, also enabling the DTMF input

(TEA1118A only).

APPLICATIONS

• Cordless telephone base stations

• Fax machines

• Answering machines.

GENERAL DESCRIPTION

The TEA1118 and TEA1118A are bipolar integrated circuits that perform all speech and line interface functions required in cordless telephone base stations. The ICs operate at a line voltage down to 1.6 V DC (with reduced performance) to facilitate the use of telephone sets connected in parallel.

The TEA1118A offers in addition to the TEA1118 electronic switching between speech and dialling. Moreover the transmit amplifier can be disabled during speech condition by means of a transmit mute function.

All statements and values refer to all versions unless otherwise specified.

QUICK REFERENCE DATA

= 15 mA; VEE=0V; R

line

=20Ω; AGC pin connected to VEE; Z

SLPE

= 600 Ω; f = 1 kHz; T

line

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 V I

V G

∆G

vtrx

DC line voltage 3.35 3.65 3.95 V internal current consumption VCC= 2.9 V − 1.15 1.4 mA supply voltage for peripherals IP=0mA − 2.9 − V typical voltage gain range

transmit amplifier (TEA1118A only) V transmit amplifier (TEA1118 only) V receive amplifier V

gain control range for transmit and

= 200 mV (RMS) −−11.3 dB

= 200 mV (RMS) 5.3 − 11.3 dB

= 4 mV (RMS) 19 − 31 dB

=75mA − 5.8 − dB

line

receive ampliﬁers with respect to I

=15mA

line

1997 Jul 14 2

Philips Semiconductors Product speciﬁcation

Versatile cordless transmisssion circuit TEA1118; TEA1118A

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

TEA1118M SSOP16 TEA1118T SO14 TEA1118AM SSOP16 TEA1118AT SO14

BLOCK DIAGRAMS

handbook, full pagewidth

PACKAGE

plastic shrink small outline package; 16 leads; body width 4.4 mm plastic small outline package; 14 leads; body width 3.9 mm plastic shrink small outline package; 16 leads; body width 4.4 mm plastic small outline package; 14 leads; body width 3.9 mm

GAR

V−>I

CURRENT

REFERENCE

SOT369-1 SOT108-1 SOT369-1 SOT108-1

TX+

TX−

V−>I

AGC

CIRCUIT

AGC

TEA1118M

TEA1118T

LOW VOLTAGE

CIRCUIT

Fig.1 Block diagram (TEA1118).

GAT

REG

MBH273

SLPE

1997 Jul 14 3

Philips Semiconductors Product speciﬁcation

Versatile cordless transmisssion circuit TEA1118; TEA1118A

handbook, full pagewidth

DTMF

TMUTE

TX+

TX−

GAR

ATTENUATOR

TRANSMIT

MUTE

V−>I

CIRCUIT

AGC

CURRENT

REFERENCE

MUTE

REG

TEA1118AM

TEA1118AT

LOW VOLTAGE

CIRCUIT

AGC

Fig.2 Block diagram (TEA1118A).

1997 Jul 14 4

MBH272

SLPE

Philips Semiconductors Product speciﬁcation

Versatile cordless transmisssion circuit TEA1118; TEA1118A

PINNING

SYMBOL

LN 1111positive line terminal SLPE 2222slope (DC resistance) adjustment REG 3333line voltage regulator decoupling GAT 4 4 −−transmit gain adjustment TMUTE −−4 5 transmit mute input DTMF −−5 6 dual-tone multi-frequency input MUTE −−6 8 mute input to select speech or dialling mode IR 7979receive ampliﬁer input AGC 8 10 8 10 automatic gain control/line loss compensation TX− 9 11 9 11 inverting transmit ampliﬁer input TX+ 10 12 10 12 non-inverting transmit ampliﬁer input V

QR 12 14 12 14 receive ampliﬁer output GAR 13 15 13 15 receive gain adjustment V

n.c. 5 and 6 5 to 8 − 4 and 7 not connected

TEA1118 TEA1118A

DESCRIPTION

SO14 SSOP16 SO14 SSOP16

11 13 11 13 negative line terminal

14 16 14 16 supply voltage for speech circuit and peripherals

1997 Jul 14 5

Philips Semiconductors Product speciﬁcation

Versatile cordless transmisssion circuit TEA1118; TEA1118A

handbook, halfpage

Fig.3 Pin configuration (TEA1118T).

SLPE GAR

REG QR

GAT

n.c. TX+ n.c. TX−

TEA1118T

5 6 7

IR AGC

MBH269

13 12

9 8

handbook, halfpage

Fig.4 Pin configuration (TEA1118M).

SLPE GAR

REG QR

GAT

TEA1118M

n.c. TX+

n.c. TX−

n.c. AGC

n.c. IR

MBH268

15 14

12 11 10

handbook, halfpage

SLPE GAR

REG QR

TMUTE

TEA1118AT

DTMF TX+

MUTE TX−

IR AGC

MBH271

13 12

9 8

Fig.5 Pin configuration (TEA1118AT).

1997 Jul 14 6

handbook, halfpage

Fig.6 Pin configuration (TEA1118AM).

SLPE GAR

REG QR

n.c.

TEA1118AM

TMUTE TX+

5 6

DTMF TX−

n.c. AGC

MUTE IR

MBH270

15 14

12 11 10

Philips Semiconductors Product speciﬁcation

Versatile cordless transmisssion circuit TEA1118; TEA1118A

FUNCTIONAL DESCRIPTION

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

Supplies (pins LN, SLPE, V

and REG)

The supply for the TEA1118 and TEA1118A and their 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 3.35 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 (see Fig.11), 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 (C

) which is connected to VEE.

REG

This 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

(RCC in the audio-frequency range). The voltage at pin SLPE is proportional to the line current. Figure 7 illustrates the supply configuration.

The ICs regulate the line voltage at pin LN, and it can be calculated as follows:

VLN=V I

SLPE=Iline

ref+RSLPE

− ICC− IP− I* = I

× I

SLPE

where:

: line current

line

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

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

The preferred value for R

is 20 Ω. Changing R

SLPE

will affect more than the DC characteristics; it also influences the transmit gain and the DTMF gain (TEA1118A only), the gain control characteristics, the sidetone level and the maximum output swing on the line.

by the formula (see also Figs 8 and 9). R

CCint

is the internal equivalent resistance of the voltage supply point, and I

is the current consumed by the output stage of the

rec

earpiece amplifier. VCC=V V

CC0=VLN

CC0

− RCC× I

− R

CCint

× (IP− I

rec

)

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

), the feeding bridge

exch

). With line currents

ref

below 7.5 mA, the internal reference voltage (generating V

) is automatically adjusted to a lower value.

ref

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 transmit and receive levels. This is called the low voltage area.

Set impedance

In the audio frequency range, the dynamic impedance is mainly determined by the R

resistor. The equivalent

impedance of the circuits is illustrated in Fig.10.

Transmit ampliﬁer (pins TX+, TX− and GAT)

The TEA1118 and TEA1118A have symmetrical transmit inputs. The input impedance between pins TX+ and TX− is equal to 62.5 kΩ; the input impedance between pins TX+/TX− and V

is equal 36.5 kΩ. The voltage gain from

pins TX+/TX− to pin LN is set at 11.3 dB. Automatic gain control is provided on this amplifier for line

loss compensation. The gain of the TEA1118 can be decreased by connecting

an external resistor R The adjustment range is equal to 6 dB. A capacitor C

between pins GAT and REG.

GAT

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

is the internal resistor which sets the gain with a

GATint

GAT

×(R

GATint

// R

GAT

typical value of 27 kΩ.

Transmit mute (pin TMUTE; TEA1118A only)

The internal circuitry of the TEA1118 and TEA1118A 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

. It may also be used to

VCC

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

1997 Jul 14 7

The transmit amplifier can be disabled by activating the transmit mute function. When TMUTE is LOW, the normal speech mode is entered, depending on the level on MUTE. When TMUTE is HIGH, the transmit amplifier inputs are disabled while the DTMF input is enabled (no confidence tone is provided). The voltage gain between LN and TX+/TX− is attenuated; the gain reduction is 80 dB.

Philips Semiconductors Product speciﬁcation

Versatile cordless transmisssion circuit TEA1118; TEA1118A

Receive ampliﬁer (pins IR, GAR and QR)

The receive amplifier has one input (IR) and one output (QR). The input impedance between pins IR and VEE is 20 kΩ. The voltage gain from pin IR to pin QR is set at 31 dB. The gain can be decreased by connecting an external resistor R

between pins GAR and QR; the

GAR

adjustment range is 12 dB. Two external capacitors C (connected between GAR and QR) and C

GARS

(connected

between GAR and VEE) ensure stability.

line

exch

TEA1118

TEA1118A

SLPE

20 Ω

andbook, full pagewidth

GAR

The C

capacitor provides a first-order low-pass filter.

GAR

The cut-off frequency corresponds to the time constant C

GAR

× (R

GARint

// R

GAR

). R

is the internal resistor

GARint

which sets the gain with a typical value of 100 kΩ. The condition C

GARS

=10×C

must be fulfilled to ensure

GAR

stability. Automatic gain control is provided on this amplifier for line

loss compensation.

619 Ω

from preamp

REG C

REG

4.7 µF

VCC

100 µF

MBH274

peripheral

circuits

Fig.7 Supply configuration.

1997 Jul 14 8

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