TEA1098H/C2 Просмотр технического описания (PDF) - Philips Electronics

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TEA1098H/C2

Speech and handsfree IC

Philips Electronics 

Philips Semiconductors

Speech and handsfree IC

Product specification

TEA1098

108

handbook, full pagewidth

IDD

(pA)

107

FCA050

106

105

104

103

102

10

1.0

1.5

2.0

2.5

3.0

VDD (V)

Fig.6 Current consumption on VDD.

POWER-DOWN MODE (PIN PD)

To reduce consumption during dialling or register recall

(flash), the TEA1098 is provided with a power-down input

(PD). When the voltage on pin PD is LOW, the current

consumption from VBB and VDD is reduced to typically

460 µA. Therefore a capacitor of 470 µF on VBB is

sufficient to power the TEA1098 during pulse dialling or

flash. The PD input has a pull-up structure. In this mode,

the capacitor CREG is internally disconnected.

Transmit channels (pins MIC+, MIC−, DTMF,

HFTX and LN)

HANDSET MICROPHONE AMPLIFIER (PINS MIC+, MIC−

AND LN)

The TEA1098 has symmetrical microphone inputs.

The input impedance between pins MIC+ and MIC− is

typically 70 kΩ. The voltage gain between pins MIC+/MIC−

and LN is set to 44.3 dB. Without output limitation, the

microphone input stage can accept signals of up to

18 mV (RMS) at 2% THD (room temperature).

The microphone inputs are biased at a voltage of one

diode.

Automatic gain control is provided for line loss

compensation.

DTMF AMPLIFIER (PINS DTMF, LN AND RECO)

The TEA1098 has an asymmetrical DTMF input. The input

impedance between DTMF and GND is typically 20 kΩ.

The voltage gain between pins DTMF and LN is set to

25.35 dB. Without output limitation, the input stage can

accept signals of up to 180 mV (RMS) at 2% THD (room

temperature).

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 −16.5 dB. This input is

DC biased at 0 V.

The automatic gain control has no effect on these

channels.

1999 Oct 14

10

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