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TEA1099

Speech and handsfree IC with auxiliary inputs/outputs and analog multiplexer

Philips Electronics 

Philips Semiconductors

Speech and handsfree IC with auxiliary

inputs/outputs and analog multiplexer

Product specification

TEA1099H

108

handbook, full pagewidth

IDD

(pA)

107

106

105

104

103

102

10

1.0

FCA050

1.5

2.0

2.5

Fig.5 Current consumption on VDD.

3.0

VDD (V)

SUPPLY FOR MICROPHONE (PINS MICS AND GNDTX)

The MICS output can be used as a supply for electret

microphones. Its voltage is equal to 2.0 V; it can source

current up to 1 mA and has an output impedance equal to

200 Ω.

LOW 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 LSAO acts and discharges

the DLC capacitor. The loudspeaker is then automatically

disabled below this DC voltage.

When VBB becomes lower than 2.5 V, the TEA1099H is

forced into 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 typically equal to 300 µA.

POWER-DOWN MODE (PINS PD AND AUXC)

To reduce current consumption during dialling or register

recall (flash), the TEA1099H is provided with a

power-down input (PD). When the voltage on both pins PD

and AUXC is LOW, the current consumption from VBB and

VDD is reduced to 460 µA typically. Therefore a capacitor

of 470 µF on VBB is sufficient to power the TEA1099H

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 CREG is internally disconnected.

RINGER MODE (PINS ESI, VBB, AUXC AND PD)

The TEA1099H is designed to be activated during the

ringing phase. The loudspeaker amplifier can be used for

the ringing signal. The IC must be powered by an external

supply on ESI, while applying a HIGH level on the logic

input AUXC and a LOW level on PD input. Only the HFRX

input and the LSAO output are activated, in order to limit

the current consumption. Some dynamic limitation is

provided to prevent the LSAO output from saturation and

VBB from being discharged below 2.7 V.

1999 Apr 08

9

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