Philips TEA1096T, TEA1096AT, TEA1096A, TEA1096 Datasheet

INTEGRATED CIRCUITS

DATA SHEET

TEA1096; TEA1096A

Speech and listening-in IC

Product Specification	November 1994
File under Integrated Circuits, IC03

Philips Semiconductors

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).

ORDERING INFORMATION

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 VBB, whereas the TEA1096A offers a fixed 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.

	TYPE NUMBER		PACKAGE
		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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Philips Semiconductors					Product Specification
Speech and listening-in IC			TEA1096; TEA1096A
QUICK REFERENCE DATA
SYMBOL	PARAMETER	CONDITIONS	MIN.	TYP.		MAX.	UNIT
Iline	line current	normal condition	15	−		140	mA
		with reduced performance	−	−		15	mA
IDD	current consumption from pin VDD	PD = LOW	−	2.4		2.9	mA
	during normal operation
IDD(PD)	current consumption from	PD = HIGH	−	100		150	μA
	capacitor CVDD during
	power-down
IBB(PD)	current consumption from	PD = HIGH	−	350		500	μA
	capacitor CVBB during
	power-down
VSLPE	stabilized voltage (line interface)		4.2	4.45		4.7	V
VDD	supply voltage for microcontroller	RDD = 390 Ω;	−	3.5		−	V
		IP = 0 mA
		RDD = 390 Ω;	−	3.1		−	V
		IP = 1 mA
VBB	stabilized supply voltage		3.4	3.6		3.8	V
Gvtx	voltage gain from pin MICP or	VMIC = 2 mV (RMS);	51	52		53	dB
	MICM to LN	RGAS = 90.9 kΩ;
		Iline = 20 mA
Gvtxr	voltage gain adjustment with		−19	−		0	dB
	RGAS
Gvrx	voltage gain from pin LN to QRP	Vline = 50 mV (RMS);	−3.5	−2.5		−1.5	dB
	or QRM	RGAR = 90.9 kΩ;
		Iline = 20 mA
Gvrxr	voltage gain adjustment with		−12	−		8	dB
	RGAR
Gtrx	line-loss compensation	RAGC = 100 kΩ	5	6		7	dB
Gvlx	voltage gain from pin LSI to QLS	VLSI = 10 mV (RMS)	34	35.5		37	dB
VLN(p-p)	maximum output voltage swing		−	3.65		4.3	V
	on pin LN (peak-to-peak value)
VQLS(p-p)	output voltage between pins QLS	VLSI = 18 mV; Iline = 20 mA	2.5	2.9		−	mA
	and VEE (peak-to-peak value)
Tamb	operating ambient temperature		−25	−		+75	°C

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Philips Semiconductors	Product Specification
Speech and listening-in IC	TEA1096; TEA1096A

BLOCK DIAGRAMS

Fig.1	Block diagram (TEA1096).
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Philips Semiconductors	Product Specification
Speech and listening-in IC	TEA1096; TEA1096A

Fig.2	Block diagram (TEA1096A).
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Philips Semiconductors						Product Specification
Speech and listening-in IC						TEA1096; TEA1096A
PINNING
SYMBOL				PINS		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
VEE			5		5	negative line terminal (ground reference)
SLPE			6		6	stabilized voltage, connection for slope resistor
VBB			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
Vref			11		11	reference voltage output
SIMP			12		12	set impedance input
VDD			13		13	supply voltage for speech circuitry/peripherals
			14		14	dynamic limiter for sending and microphone mute
DLS/MMUTE
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

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Philips Semiconductors	Product Specification

Speech and listening-in IC		TEA1096; TEA1096A
Fig.3 Pin configuration (TEA1096).	Fig.4	Pin configuration (TEA1096A).

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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, VEE, 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 VDD and VBB to power the transmission part and the loudspeaker amplifier respectively.

As can be seen from Fig.5, the line current (Iline) is split between the sending output stage (Iln), the circuitry

connected to SLPE (Isl), the transmission circuit (IDD), the

peripheral circuits (Ip) and the current switch (ISUP). It can be shown that:

ISUP = 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 ISUP ≈ Iline − 7.7 mA − IP.

The remaining current ISUP is available for the listening-in part. The current consumption IBB0 of the listening-in 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 = VSLPE + RSLPE × (Iline − Iln).

The supply voltage for the transmission part and

peripheral circuits (VDD) is generated from VSLPE and is equal to VDD = VSLPE − RDD × (IDD + Ip).

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 VBB 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 VSLPE is at least 0.4 V higher than VBB (VBB supply efficiency).

Fig.5 Supply arrangement.

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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 ISUP is supplied to

VBB via TR1, when VSLPE is higher than VBB + 0.4 V. When VSLPE is lower, this current is shunted to VEE via TR2. All 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 CVDD is 100 μA and from the VBB supply point 350 μA. The capacitors CVDD (100 μF) and CVBB (470 μF) are sufficient to power theTEA1096/TEA1096A

during pulse dialling/flash.

VBB voltage adjustment: pin VBA (TEA1096 only)

A resistor connected between pins VBA and VEE 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 VSLPE is at least 0.4 V 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 RGAS

and equals 52 dB with RGAS = 90.9 kΩ and Iline = 20 mA. A capacitor CGAS connected in parallel with RGAS 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 RGAS, 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.

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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:

∙	VLN	=	Z line	=	12	providing
	V-------------OSP		-----------------------------------------------------( Z line + ZSET ) × 24

ZSET = Z line

∙ 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 ZSET is 10 times lower than ZSIMP.

Fig.7 AC modulator equivalent model.

Fig.8 Set impedance.

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