TEA1098AH 데이터 시트보기 (PDF) - Philips Electronics

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TEA1098AH

Speech and handsfree IC

Philips Electronics 

Philips Semiconductors

Speech and handsfree IC

Preliminary specification

TEA1098A

100.0u

handbook, full pagewidth

IDD (A)

10.0u

MGL438

1.0u

100.0n

10.0n

1.0n

100.0p

10.0p

1.0

1.5

2.0

2.5

3.0

VDD (V)

Fig.6 Current consumption on VDD.

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 2.0 V; it can source a

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 becomes lower than 2.7 V, the VBB

detector of the receive dynamic limiter on pin LSAO acts

continuously, discharging the capacitor connected to

pin DLC. In the DC condition, the loudspeaker is then

automatically disabled below this voltage.

When VBB goes below 2.5 V, the TEA1098A 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 (PIN PD)

To reduce consumption during dialling or register recall

(flash), the TEA1098A 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 460 µA

typically. Therefore a capacitor of 470 µF on VBB is

sufficient to power the TEA1098A during pulse dialling or

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

the capacitor CREG is internally disconnected.

2000 Mar 21

10

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