Philips TEA1096T, TEA1096AT, TEA1096A, TEA1096 Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TEA1096; TEA1096A

Speech and listening-in IC

Product Speciﬁcation File under Integrated Circuits, IC03

Philips Semiconductors

November 1994

Philips Semiconductors Product Speciﬁcation

Speech and listening-in IC TEA1096; TEA1096A

FEATURES

• Line Interface with: – active set impedance (adjustable) – voltage regulator with adjustable DC voltage – low voltage circuit for parallel operation

• Interface to peripheral circuits with: – supply VDD for microcontroller – stabilized supply voltage (VBB) which is:

available for peripheral circuits

adjustable (TEA1096 only) – Dual-Tone MultiFrequency (DTMF) signal input – power-down function for pulse dialling/flash – mute function to disable speech during dialling

• Microphone amplifier with: – symmetrical high impedance inputs – externally adjustable gain – AGC; line-loss compensation – dynamic limiter – microphone mute function

• Receiving amplifier with: – externally adjustable gain – confidence tone during dialling – double anti-sidetone circuit for long and short lines – AGC; line-loss compensation – earpiece protection by soft clipping.

• Listening-in circuit with: – loudspeaker amplifier – dynamic limiter to prevent distortion at any supply

condition – volume control via a potentiometer – fixed gain of 35.5 dB – disable function – gain control input (TEA1096A only).

APPLICATIONS

• Line-powered telephone sets with listening-in/line monitoring function.

DIFFERENCES BETWEEN TEA1096 AND TEA1096A

The TEA1096 offers via input VBA an adjustable stabilized supply voltage V stabilized voltage VBB.

The TEA1096A offers a DC gain control input VCI to set the loudspeaker volume, whereas the TEA1096 offers volume control via a potentiometer.

GENERAL DESCRIPTION

The TEA1096 and TEA1096A are bipolar ICs intended for use in line powered telephone sets. They offer a speech/transmission function, listening-in and line monitoring facilities of the received line signal via the loudspeaker.

The devices incorporate a line interface block, a microphone and DTMF amplifier, a receiving amplifier, a supply function, a loudspeaker amplifier, and a dynamic limiter in the transmission channel and the listening-in channel.

, whereas the TEA1096A offers a fixed

ORDERING INFORMATION

TYPE NUMBER

NAME DESCRIPTION VERSION

TEA1096 DIP28 plastic dual in-line package; 28 leads (600 mil) SOT117-1 TEA1096A DIP28 plastic dual in-line package; 28 leads (600 mil) SOT117-1 TEA1096T SO28 plastic small outline package; 28 leads; body width 7.5 mm SOT136-1

TEA1096AT SO28 plastic small outline package; 28 leads; body width 7.5 mm SOT136-1

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PACKAGE

Philips Semiconductors Product Speciﬁcation

Speech and listening-in IC TEA1096; TEA1096A

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

line

DD(PD)

BB(PD)

SLPE

vtx

∆G

vtxr

vrx

∆G

vrxr

∆G

trx

vlx

LN(p-p)

QLS(p-p)

amb

line current normal condition 15 − 140 mA

with reduced performance −−15 mA

current consumption from pin V

PD = LOW − 2.4 2.9 mA

during normal operation current consumption from

capacitor C

VDD

during

PD = HIGH − 100 150 µA

power-down current consumption from

capacitor C

VBB

during

PD = HIGH − 350 500 µA

power-down stabilized voltage (line interface) 4.2 4.45 4.7 V supply voltage for microcontroller RDD= 390 Ω;

− 3.5 − V

IP=0mA R

= 390 Ω;

− 3.1 − V

IP=1mA stabilized supply voltage 3.4 3.6 3.8 V voltage gain from pin MICP or

MICM to LN

voltage gain adjustment with R

GAS

voltage gain from pin LN to QRP or QRM

voltage gain adjustment with R

GAR

line-loss compensation R voltage gain from pin LSI to QLS V maximum output voltage swing

= 2 mV (RMS);

MIC

= 90.9 kΩ;

GAS

=20mA

line

51 52 53 dB

−19 − 0dB

= 50 mV (RMS);

line

= 90.9 kΩ;

GAR

= 20 mA

line

−3.5 −2.5 −1.5 dB

−12 − 8dB

= 100 kΩ 567dB

AGC

= 10 mV (RMS) 34 35.5 37 dB

LSI

− 3.65 4.3 V

on pin LN (peak-to-peak value) output voltage between pins QLS

LSI

=18mV; I

= 20 mA 2.5 2.9 − mA

line

and VEE (peak-to-peak value) operating ambient temperature −25 − +75 °C

November 1994 3

Philips Semiconductors Product Speciﬁcation

Speech and listening-in IC TEA1096; TEA1096A

BLOCK DIAGRAMS

Fig.1 Block diagram (TEA1096).

November 1994 4

Philips Semiconductors Product Speciﬁcation

Speech and listening-in IC TEA1096; TEA1096A

Fig.2 Block diagram (TEA1096A).

November 1994 5

Philips Semiconductors Product Speciﬁcation

Speech and listening-in IC TEA1096; TEA1096A

PINNING

SYMBOL

DESCRIPTION

TEA1096 TEA1096A

DLL/DIL 1 1 dynamic limiter and disable input for loudspeaker ampliﬁer VBA 2 − VBB voltage adjustment VCI − 2 volume control input for loudspeaker ampliﬁer QLS 3 3 loudspeaker ampliﬁer output REG 4 4 decoupling line voltage stabilizer

PINS

5 5 negative line terminal (ground reference) SLPE 6 6 stabilized voltage, connection for slope resistor V

7 7 stabilized supply voltage for listening-in circuitry AGC 8 8 automatic gain control ILS 9 9 input line signal LN 10 10 positive line terminal V

ref

11 11 reference voltage output SIMP 12 12 set impedance input V

DLS/

MMUTE 14 14 dynamic limiter for sending and microphone mute

13 13 supply voltage for speech circuitry/peripherals

STAB 15 15 reference current adjustment OSP 16 16 sending preampliﬁer output GAS 17 17 sending gain adjustment MUTE 18 18 mute input to select speech or DTMF dialling DTMF 19 19 dual-tone multi-frequency (DTMF) input PD 20 20 power-down input MICM 21 21 inverting microphone ampliﬁer input MICP 22 22 non-inverting microphone ampliﬁer input BAL1 23 23 connection for balance network 1 BAL2 24 24 connection for balance network 2 QRP 25 25 non-inverting receiving ampliﬁer output GAR 26 26 receiving gain adjustment QRM 27 27 inverting receiving ampliﬁer output LSI 28 28 loudspeaker ampliﬁer input

November 1994 6

Philips Semiconductors Product Speciﬁcation

Speech and listening-in IC TEA1096; TEA1096A

Fig.3 Pin configuration (TEA1096).

November 1994 7

Fig.4 Pin configuration (TEA1096A).

Philips Semiconductors Product Speciﬁcation

Speech and listening-in IC TEA1096; TEA1096A

FUNCTIONAL DESCRIPTION Remark: all data given in this chapter are typical values

except when otherwise specified.

Supply pins SLPE, LN, V

, VBB, VDD, REG and PD

The supply for the TEA1096/TEA1096A and its peripherals is obtained from the telephone line. The circuits regulate the line voltage and generate their own supply voltages V

and VBB to power the transmission

part and the loudspeaker amplifier respectively. As can be seen from Fig.5, the line current (I

) is split

line

between the sending output stage (Iln), the circuitry connected to SLPE (Isl), the transmission circuit (IDD), the peripheral circuits (Ip) and the current switch (I

SUP

). It can

be shown that:

SUP=Iline

− (Iln+Isl+IDD+IP)

With nominal conditions where:

Iln= 5 mA, Isl= 0.3 mA and IDD= 2.4 mA it therefore follows that I

SUP

≈ I

− 7.7 mA − IP.

line

The remaining current I part. The current consumption I

is available for the listening-in

SUP

of the listening-in

BB0

circuitry is 2.5 mA. To power the loudspeaker, the line current has to be more than 10 mA.

The voltage at SLPE is stabilized at 4.45 V nominal. The DC line voltage is regulated at: VLN=V

SLPE+RSLPE

× (I

line

− Iln).

The supply voltage for the transmission part and peripheral circuits (VDD) is generated from V equal to VDD=V

− RDD× (IDD+Ip).

SLPE

and is

VBB supplies the listening-in circuitry and is stabilized at

3.6 V nominal. A resistor connected between pin REG and VEE can be

used to decrease the SLPE voltage while maintaining V

at its nominal value, whereas a resistor connected between pin REG and pin SLPE will increase the SLPE voltage while maintaining VBB at its nominal value. When adjusting the SLPE voltage to a lower value, care should be taken that the V

is at least 0.4 V higher than V

SLPE

(VBB supply efficiency).

Fig.5 Supply arrangement.

November 1994 8

Philips Semiconductors Product Speciﬁcation

Speech and listening-in IC TEA1096; TEA1096A

The function of the current switch TR1-TR2 is to reduce distortion of large line signals. Current I VBB via TR1, when V V

is lower, this current is shunted to VEE via TR2. All

SLPE

is higher than VBB+ 0.4 V. When

SLPE

is supplied to

SUP

excess line current, not used for internal supply is consumed in the VBB stabilizer or directly shunted to VEE.

To reduce the current consumption during pulse dialling, the TEA1096/TEA1096A are provided with a power-down (PD) input. The PD input has a pull-down structure. When the voltage on PD is HIGH, the current consumption from VDD capacitor C point 350 µA. The capacitors C

is 100 µA and from the VBB supply

VDD

(100 µF) and C

VDD

VBB

(470 µF) are sufficient to power theTEA1096/TEA1096A during pulse dialling/flash.

voltage adjustment: pin VBA (TEA1096 only)

A resistor connected between pins VBA and V

can be

used to increase the VBB voltage, whereas a resistor connected between pins VBA and VBB will decrease the VBB voltage. When adjusting the VBB voltage to a higher value, care should be taken that V

is at least 0.4 V

SLPE

higher than VBB (VBB supply efficiency).

Sending channel: pins MICP, MICM, DTMF, GAS, OSP, LN, MUTE, DLS and AGC

The TEA1096/TEA1096A has symmetrical microphone inputs MICP, MICM with an input resistance of 64 kΩ between MICP and MICM (2 × 32 kΩ). In the speech mode (MUTE = LOW), the overall gain from MICP-MICM to LN can be adjusted from 33 dB to 52 dB to suit specific requirements. The gain is proportional to the value of R and equals 52 dB with R capacitor C

connected in parallel with R

GAS

= 90.9 kΩ and I

GAS

= 20 mA. A

line

GAS

can be

used to provide a first-order low-pass filter. Automatic gain control (AGC) is provided for line-loss

compensation as well as dynamic limitation for reduction of the distortion of the transmitted signal on the line. The microphone amplifier can be disabled by short-circuiting pin DLS to VEE (secret function) and can be muted into DTMF mode by applying a HIGH level on pin MUTE.

The TEA1096/TEA1096A has an asymmetrical DTMF input with an input resistance of 20 kΩ. In the DTMF mode, the overall gain from DTMF to LN is proportional to R

GAS

and is 26.5 dB less than the microphone amplifier gain. Switch-over from one mode to the other is click-free.

Fig.6 Sending channel.

November 1994 9

Philips Semiconductors Product Speciﬁcation

Speech and listening-in IC TEA1096; TEA1096A

It can be calculated from Fig.7 that the AC modulator gain can be written:

• providing

-------------V

OSP

SET=Zline

-----------------------------------------------------( Z

line

SET

) 24×+

12==

• Gv (LN to OSP) = 21.6 dB. The frequency response for audio frequencies of the

sending channel is flat in this case for a complex line termination.

Set impedance: pins ILS, SIMP and LN

The TEA1096/TEA1096A provides an active set impedance in both the receiving and sending conditions, thus allowing a flat frequency response for a complex line impedance, without the need for any extra compensation network.

As can be derived from Fig.8 the set impedance Z 10 times lower than Z

SIMP

SET

Fig.7 AC modulator equivalent model.

Fig.8 Set impedance.

November 1994 10

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