Philips TEA1097TV-C1, TEA1097H-C1 Datasheet

DATA SH EET

Product speciﬁcation Supersedes data of 1998 Jun 11 File under Integrated Circuits, IC03

1999 Apr 08

INTEGRATED CIRCUITS

TEA1097

Speech and loudspeaker amplifier IC with auxiliary inputs/outputs and analog multiplexer

1999 Apr 08 2

Philips Semiconductors Product speciﬁcation

Speech and loudspeaker ampliﬁer IC with auxiliary inputs/outputs and analog multiplexer

TEA1097

FEATURES Line interface

• Low DC line voltage

• Voltage regulator with adjustable DC voltage

• Symmetrical high-impedance inputs (70 kΩ) for

dynamic, magnetic or electric microphones

• Dual Tone Multi-Frequency (DTMF) input with confidence tone on earphone and/or loudspeaker

• Receive amplifier for dynamic, magnetic or piezo-electric earpieces (with externally adjustable gain)

• Automatic Gain Control (AGC) for true line loss compensation.

Supplies

• Provides a strong 3.35 V regulated supply for microcontroller or dialler

• Provides filtered power supply, optimized according to line current and compatible with external voltage or current sources

• Filtered 2 V power supply output for electret microphone

• Compatible with a ringer mode

• Power-Down (

PD) logic input for power-down.

Loudspeaker ampliﬁer

• Single-ended rail-to-rail output

• Externally adjustable gain

• Dynamic limiter to prevent distortion

• Logarithmic volume control via linear potentiometer.

Auxiliary interfaces

• Asymmetrical high-impedance input for electret microphone.

• General purpose auxiliary output for transmit and receive

• Auxiliary transmit input with high signal level capability dedicated to line transmission

• Auxiliary receive input with high signal level capability

• Integrated multiplexer for channels selection.

APPLICATIONS

• Telephone answering machines

• Telephones with digital handsfree

• Line powered telephone sets

• Cordless telephones

• Fax machines.

GENERAL DESCRIPTION

The TEA1097 is an analog bipolar circuit dedicated for telephone applications. It includes a line interface, handset microphone and earpiece amplifiers, base microphone and loudspeaker amplifiers, some specific auxiliary Inputs/Outputs (I/Os) and an analog multiplexer to enable the right transmit and/or receive channels. The multiplexer is controlled by a logic circuitry decoding four logic inputs provided by a microcontroller. Twelve different application modes have been defined and can be accessed by selecting the right logic inputs.

This IC can be supplied by the line and/or by the mains if available (in a cordless telephone or a telephone answering machine for example). It provides a 3.35 V supply for a microcontroller or dialler and a 2 V filtered voltage supply for electret microphones. The IC is designed to facilitate the use of the loudspeaker amplifier during ringing phase.

ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TEA1097TV VSO40 plastic very small outline package; 40 leads SOT158-1 TEA1097H QFP44 plastic quad ﬂat package; 44 leads (lead length 1.3 mm);

body 10 × 10 × 1.75 mm

SOT307-2

1999 Apr 08 3

Philips Semiconductors Product speciﬁcation

Speech and loudspeaker ampliﬁer IC with auxiliary inputs/outputs and analog multiplexer

TEA1097

QUICK REFERENCE DATA

line

= 15 mA; R

SLPE

=20Ω; Z

line

= 600 Ω; f = 1 kHz; T

amb

=25°C; AGC pin connected to LN;PD = HIGH; HFC = LOW;

AUXC = LOW;

MUTT = HIGH; MUTR = HIGH; measured according to test circuits; unless otherwise speciﬁed.

Note

1. When the channel is enabled according to Table 1.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

line

line current operating range normal operation

TEA1097H 11 − 140 mA TEA1097TV 11 − 130 mA

with reduced performance 1 − 11 mA

SLPE

stabilized voltage between SLPE and GND (V

ref

)

line

= 15 mA 3.4 3.7 4.0 V

line

= 70 mA 5.7 6.1 6.5 V

regulated supply voltage for internal circuitry

line

= 15 mA 2.75 3.0 3.25 V

line

= 70 mA 4.9 5.3 5.7 V

regulated supply voltage on pin V

VBB> 3.35 V + 0.25 V (typ.)

3.1 3.35 3.6 V

otherwise − V

− 0.25 − V

ESI(ext)

external voltage supply allowed on pin ESI

−− 6V

ESI(ext)

external current supply allowed on pin ESI

−− 140 mA

current available on pin V

speech mode − 11 − mA handsfree mode;

HFC = HIGH

− 9.5 − mA

BB(pd)

current consumption on VBB during power-down phase

PD = LOW − 460 −µA

v(MIC-LN)

voltage gain from pin MIC+/MIC− to LN

MIC

= 5 mV (RMS) 43.3 44.3 45.3 dB

v(IR-RECO)

voltage gain from pin IR (referenced to LN) to RECO

VIR= 15 mV (RMS) 28.7 29.7 30.7 dB

∆G

v(QR)

gain voltage range between pins RECO and QR

−3 − +15 dB

v(TXIN-TXOUT)

voltage gain from pin TXIN to TXOUT

TXIN

= 3 mV (RMS);

GATX

= 30.1 kΩ; note 1

13.15 14.85 16.55 dB

v(TXAUX-LN)

voltage gain from pin TXAUX to LN V

TXAUX

= 0.1 V (RMS);

note 1

11.5 12.5 13.5 dB

v(HFRX-LSAO)

voltage gain from pin HFRX to LSAO

HFRX

= 20 mV (RMS);

GALS

= 255 kΩ; note 1

25.5 28 30.5 dB

∆G

v(trx)

gain control range for transmit and receive ampliﬁers affected by the AGC; with respect to I

line

=15mA

line

= 70 mA; on

v(MIC-LN)

, G

v(IR-RECO)

and G

v(IR-AUXO)

5.45 6.45 7.45 dB

1999 Apr 08 4

Philips Semiconductors Product speciﬁcation

Speech and loudspeaker ampliﬁer IC with auxiliary inputs/outputs and analog multiplexer

TEA1097

BLOCK DIAGRAM

Fig.1 Block diagram.

The pin numbers given in parenthesis refer to the TEA1097H.

handbook, full pagewidth

MGL392

LINE CURRENT DETECTION LOW VOLTAGE BEHAVIOUR

TAIL

CURRENTS

SUPPLY

MANAGEMENT

SWITCH

STARTER

AGC

ATT.

GND

ESI V

(19) 23

MICS

(10) 13

(9) 12

(20) 24

(38) 40

AGC

17 (13)

22 (18)

19 (15)

REG SLPE 20

(16)18(14)

Tail currents for preamps

STAB 25 (21)

LSAO

16 (12)

DLC 11 (8)

GALS 14 (11)

TXAUX

5 (43)

MIC+

33 (31)

MIC−

32 (30)

DTMF

34 (32)

POWER-DOWN

CURRENT SOURCES

ANALOG

MULTIPLEXER

CONTROL

DYNAMIC

LIMITER

VOLUME

CONTROL

HFC(37) 39 MUTT(39) 1 MUTR(40) 2 AUXC(41) 3

GATX(27) 29

TXOUT

(26) 28

VOL(23) 27

HFRX

(1) 7

HFTX

(36) 38

(17) 21

RAUX

(42) 4

GNDTX(29) 31

TXIN

30 (28)

AUXO

6 (44)

RECO

37 (35)

35 (33)

GARX

36 (34)

TEA1097TV

1999 Apr 08 5

Philips Semiconductors Product speciﬁcation

Speech and loudspeaker ampliﬁer IC with auxiliary inputs/outputs and analog multiplexer

TEA1097

PINNING

SYMBOL

DESCRIPTION

VSO40 QFP44

MUTT 1 39 logic input (active LOW) MUTR 2 40 logic input (active LOW) AUXC 3 41 logic input RAUX 4 42 auxiliary receive ampliﬁer input TXAUX 5 43 auxiliary transmit ampliﬁer input AUXO 6 44 auxiliary ampliﬁer output HFRX 7 1 receive input for loudspeaker ampliﬁer n.c. 8 to 10,

15 and 26

2 to 7, 22, 24 and 25

not connected

DLC 11 8 dynamic limiter capacitor for the loudspeaker ampliﬁer ESI 12 9 external supply input V

13 10 stabilized supply for internal circuitry GALS 14 11 loudspeaker ampliﬁer gain adjustment LSAO 16 12 loudspeaker ampliﬁer output GND 17 13 ground reference SLPE 18 14 line current sense LN 19 15 positive line terminal REG 20 16 line voltage regulator decoupling IR 21 17 receive ampliﬁer input AGC 22 18 automatic gain control/line loss compensation V

23 19 3.35 V regulated voltage supply for microcontroller MICS 24 20 microphone supply output STAB 25 21 reference current adjustment VOL 27 23 loudspeaker volume adjustment TXOUT 28 26 base microphone ampliﬁer output GATX 29 27 base microphone ampliﬁer gain adjustment TXIN 30 28 base microphone ampliﬁer input GNDTX 31 29 ground reference for microphone ampliﬁers MIC− 32 30 negative handset microphone ampliﬁer input MIC+ 33 31 positive handset microphone ampliﬁer input DTMF 34 32 dual tone multi-frequency input QR 35 33 earpiece ampliﬁer output GARX 36 34 earpiece ampliﬁer gain adjustment RECO 37 35 receive ampliﬁer output HFTX 38 36 transmit input for auxiliary receive ampliﬁer HFC 39 37 logic input PD 40 38 power-down input (active LOW)

1999 Apr 08 6

Philips Semiconductors Product speciﬁcation

Speech and loudspeaker ampliﬁer IC with auxiliary inputs/outputs and analog multiplexer

TEA1097

Fig.2 Pin configuration (VSO40).

handbook, halfpage

TEA1097TV

MGL393

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20

MUTT MUTR AUXC RAUX

TXAUX

AUXO

HFRX

n.c. n.c. n.c.

DLC

ESI

GALS

n.c.

LSAO

GND

SLPE

REG

PD HFC HFTX RECO GARX QR DTMF MIC+ MIC− GNDTX TXIN GATX TXOUT VOL n.c. STAB MICS V

AGC IR

40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21

1999 Apr 08 7

Philips Semiconductors Product speciﬁcation

Speech and loudspeaker ampliﬁer IC with auxiliary inputs/outputs and analog multiplexer

TEA1097

Fig.3 Pin configuration (QFP44).

handbook, full pagewidth

1 2 3 4 5 6 7 8

9 10 11

33 32 31 30 29 28 27 26 25 24 23

TEA1097H

FCA019

QR DTMF MIC+ MIC−

TXIN GATX TXOUT n.c. n.c. VOL

HFRX

n.c. n.c.

n.c n.c n.c

DLC

ESI

GALS

GNDTX

TXAUX

RAUX

AUXC

MUTR

MUTT

HFTX

RECO

GARX

AUXO

HFC

GND

SLPE

REG

AGC

MICS

STAB

n.c

LSAO

n.c

FUNCTIONAL DESCRIPTION

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

Supplies

INE INTERFACE AND INTERNAL SUPPLY (PINS LN, SLPE,

REG

AND V

)

The supply for the TEA1097 and its peripherals is obtained from the line. The IC generates a stabilized reference voltage (V

ref

) between pins SLPE and GND. This reference voltage is equal to 3.7 V for line currents lower than 18 mA. It than increases linearly with the line current and reaches the value of 6.1 V for line currents higher than 45 mA. For line currents below 9 mA, the internal reference voltage generating V

ref

is automatically adjusted to a lower value. This is the so-called low voltage area and the TEA1097 has limited performances in this area (see Section “Low voltage behaviour”). This reference voltage is temperature compensated.

The voltage between pins SLPE and REG is used by the internal regulator to generate the stabilized reference voltage and is decoupled by means of a capacitor between pins LN and REG.

This capacitor converted into an equivalent inductance realizes the set impedance conversion from its DC value (R

SLPE

) to its AC value (done by an external impedance).

The IC regulates the line voltage at pin LN and it can be calculated as follows:

where:

line

= line current

Ix= current consumed on pin LN (approximately a few µA)

SLPE

= current flowing through the R

SLPE

resistor.

refRSLPE

I×+

SLPE

SLPEIline

Ix–=

1999 Apr 08 8

Philips Semiconductors Product speciﬁcation

Speech and loudspeaker ampliﬁer IC with auxiliary inputs/outputs and analog multiplexer

TEA1097

The preferred value for R

SLPE

is 20 Ω. Changing this value will affect more than the DC characteristics; it also influences the transmit gains to the line, the gain control characteristic, the sidetone level and the maximum output swing on the line.

As can be seen from Fig.4, the internal circuitry is supplied by pin VBB, which is a strong supply point combined with the line interface. The line current is flowing through the R

SLPE

resistor and is sunk by the VBB voltage stabilizer, becoming available for a loudspeaker amplifier or any peripheral IC. Its voltage is equal to 3.0 V for line currents lower than 18 mA. It than increases linearly with the line current and reaches the value of 5.3 V for line currents greater than 45 mA. It is temperature compensated.

The aim of the current switch TR1 and TR2 is to reduce distortion of large AC line signals. Current I

SLPE

is supplied to VBB via TR1 when the voltage on SLPE is greater than VBB+ 0.25 V. When the voltage on SLPE is lower than this value, the current I

SLPE

is shunted to GND via TR2.

The reference voltage V

ref

can be increased by connecting an external resistor between pins REG and SLPE. For large line currents, this increase can slightly affect some dynamic performances such as maximum signal level on the line for 2% THD. The voltage on pin VBB is not affected by this external resistor. See Fig.5 for the main DC voltages.

Fig.4 Line interface principle.

handbook, full pagewidth

MGM298

TN2

TR2

TR1

TN1

TP1

GND

from

preamp

GND

REG

SLPE

REG

4.7 µF

SLPE

20 Ω

1999 Apr 08 9

Philips Semiconductors Product speciﬁcation

Speech and loudspeaker ampliﬁer IC with auxiliary inputs/outputs and analog multiplexer

TEA1097

Fig.5 Main DC voltages as a function of line current.

handbook, full pagewidth

0.070.06

0 0.01

voltages

(V)

0.02 0.05

MICS

SLPE

line

(A)

0.040.03

FCA049

EXTERNAL SUPPLY (PINS ESI AND VBB) The TEA1097 can be supplied by the line as well as by

external power sources (voltage or current sources) that must be connected to pin ESI.

The IC will choose which supply to use according to the voltage it can provide. A voltage supply on ESI is efficient only if its value is greater than the working voltage of the internal V

voltage stabilizer. Otherwise the IC continues to be line powered. The current consumed on this source is at least equal to the internal consumption. It depends on the voltage difference between the value forced on ESI and the working voltage of the internal stabilizer. The current required increases with the voltage difference to manage. The excess current compared to the internal consumption becomes then available for other purposes such as supplying a loudspeaker amplifier. The voltage source should not exceed 6 V. If the value of the external voltage source can be lower than the working voltage of the internal stabilizer, an external diode is required to avoid reverse current flowing into the external power supply.

In case of current source, the voltage on VBB and ESI depends on the current available. It is internally limited to

6.6 V. The current source should not exceed 140 mA.

SUPPLY FOR MICROCONTROLLERS (PIN V

)

The voltage on V

supply point follows the voltage on V

with a difference equal to 250 mV (typ.) and is internally limited to 3.35 V. This voltage is temperature compensated. This supply point can provide a current up to 3 mA (typ.). Its internal consumption stays low (a few 10 nA) as long as VDD does not exceed 1.5 V (see Fig.6).

An external voltage can be connected on VDD with limited extra consumption on VDD (typically 100 µA). This voltage source should not be lower than 3.5 V and higher than 6 V.

VBB and VDD can supply external circuits in the limits of currents provided either from the line or from pin ESI, taking into account the internal current consumption.

1999 Apr 08 10

Philips Semiconductors Product speciﬁcation

Speech and loudspeaker ampliﬁer IC with auxiliary inputs/outputs and analog multiplexer

TEA1097

Fig.6 Current consumption on VDD.

handbook, full pagewidth

1.0

(pA)

1.5 2.5 3.0 VDD (V)

2.0

FCA050

SUPPLY FOR MICROPHONE (PINS MICS AND GNDTX) The MICS output can be used as a supply for an electret

microphone. Its voltage is equal to 2 V; it can source current up to 1 mA and has an output impedance equal to 200 Ω.

OW VOLTAGE BEHAVIOUR

For line currents below 9 mA, the reference voltage is automatically adjusted to a lower value; the VBB voltage follows the SLPE voltage with 250 mV difference. The excess current available for other purposes than DC biasing of the IC becomes small. In this low voltage area, the IC has limited performances.

When the VBB voltage reaches 2.7 V, the VBB detector of the receive dynamic limiter on pin LSAO acts continuously, discharging the capacitor at pin DLC. In the DC condition, the loudspeaker is automatically disabled below this voltage.

When V

becomes lower than 2.5 V, the TEA1097 is forced in a low voltage mode whatever the levels on the logic inputs are. It is a speech mode with reduced performances only enabling the microphone channel (between the MIC inputs and LN) and the earpiece amplifier. These two channels are able to deliver signals for line currents as small as 3 mA. The HFC input is tied to GND sinking a current equal to 300 µA (typ.).

OWER-DOWN MODE (PINS PD AND AUXC)

To reduce current consumption during dialling or register recall (flash), the TEA1097 is provided with a power-down input (

PD). When the voltage on pins PD and AUXC is LOW, the current consumption from VBB and VDD is reduced to 460 µA (typ.). Therefore a capacitor of 470 µF connected to pin VBB is sufficient to power the TEA1097 during pulse dialling or flash. The PD input has a pull-up structure, while AUXC has a pull-down structure. In this mode, the capacitor C

REG

is internally disconnected.

1999 Apr 08 11

Philips Semiconductors Product speciﬁcation

Speech and loudspeaker ampliﬁer IC with auxiliary inputs/outputs and analog multiplexer

TEA1097

RINGER MODE (PINS ESI, VBB, AUXC AND PD) The TEA1097 is designed to be activated during the

ringing phase. The loudspeaker amplifier can be used for the melody signal. The IC must be powered by an external supply on pin ESI, while applying a HIGH level on the logic input AUXC and a LOW level on the

PD input. Only the HFRX input and the LSAO output are activated, in order to limit the current consumption. Some dynamic limiting is provided to prevent VBB from being discharged below

2.7 V.

Transmit channels (pins MIC+, MIC−, DTMF, TXAUX and LN)

ANDSET MICROPHONE AMPLIFIER (PINS MIC+, MIC− AND

LN) The TEA1097 has symmetrical microphone inputs.

The input impedance between MIC+ and MIC− is 70 kΩ (typ.). The voltage gain between pins MIC+, MIC− and LN is set to 44.3 dB. Without limitation from the output, the microphone input stage can accommodate signals up to 18 mV (RMS) at room temperature for 2% of THD. The microphone inputs are biased at one diode voltage.

Automatic gain control is provided for line loss compensation.

DTMF

AMPLIFIER (PINS DTMF, LN AND RECO)

The TEA1097 has an asymmetrical DTMF input. The input impedance between pin DTMF and GND is 20 kΩ (typ.). The voltage gain between pins DTMF and LN is set to

25.35 dB. Without limitation from the output, the input stage can accommodate signals up to 180 mV (RMS) at room temperature for 2% of THD.

When the DTMF amplifier is enabled, dialling tones may be sent on the line. These tones can be heard in the earpiece or in the loudspeaker at a low level. This is called the confidence tone. The voltage attenuation between pins DTMF and RECO is typically equal to −16.5 dB.

The DC biasing of this input is 0 V. The automatic gain control has no effect on these

channels.

UXILIARY TRANSMIT AMPLIFIER (PINS TXAUX AND LN)

The TEA1097 has an asymmetrical auxiliary input TXAUX. The input impedance between pins TXAUX and GND is 20 kΩ (typ.). The voltage gain between pins TXAUX and LN is set to 12.5 dB. Without limitation from the output, the input stage can accommodate signals up to 1.2 V (RMS) at room temperature for 2% of THD. The TXAUX input is biased at two diodes voltage.

Automatic gain control is provided for line loss compensation.

ICROPHONE MONITORING ON TXOUT (PINS MIC+, MIC−

AND TXOUT)

The voltage gain between the microphone inputs MIC+, MIC− and the output TXOUT is set to 49.8 dB. This channel gives an image of the signal sent on the line while speaking in the handset microphone. Using external circuitry, this signal can be used for several purposes such as sending dynamic limiting or anti-howling in a listening-in application. The TXOUT output is biased at two diodes voltage.

The automatic gain control has no effect on these channels.

Receive channels (pins IR, RAUX, RECO, GARX and QR)

AMPLIFIER (PINS IR AND RECO)

The receive amplifier has one input IR which is referred to the line. The input impedance between pins IR and LN is 20 kΩ (typ.) and the DC biasing between these pins is equal to one diode voltage. The gain between pins IR (referenced to LN) and RECO is typically equal to 29.7 dB. Without limitation from the output, the input stage can accommodate signals up to 50 mV (RMS) at room temperature for 2% of THD.

This receive amplifier has a rail-to-rail output RECO, which is designed for use with high-ohmic (real) loads (larger than 5 kΩ). This output is biased at two diodes voltage.

Automatic gain control is provided for line loss compensation.

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