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TEA1097H

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

Philips Electronics 

Philips Semiconductors

Speech and loudspeaker amplifier IC with

auxiliary inputs/outputs and analog multiplexer

Product specification

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)

HANDSET 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.

AUXILIARY 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.

MICROPHONE 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)

RX 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.

1999 Apr 08

11

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