TEA1098 データシートの表示（PDF） - Philips Electronics

部品番号

コンポーネント説明

メーカー

TEA1098

Speech and handsfree IC

Philips Electronics 

Philips Semiconductors

Speech and handsfree IC

Product specification

TEA1098

8

handbook, full pagewidth

voltages

(V)

6

4

2

FCA049

LN

SLPE

VBB

VDD

MICS

0

0

0.01

0.02

0.03

0.04

0.05

0.06 Iline (A) 0.07

Fig.5 Main DC voltages.

VDD SUPPLY FOR MICROCONTROLLERS (PIN VDD)

The voltage on the VDD supply point follows the voltage on

VBB with a difference typically of 250 mV, internally limited

to 3.35 V. This voltage is temperature compensated.

This supply point can provide a current of up to typically

3 mA. 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 to VDD with limited

extra consumption on VDD (typically 100 µA). This voltage

source should not be below 3.5 V or above 6 V.

VBB and VDD can supply current to external circuits within

the line limits, taking into account the internal current

consumption.

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 of 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 a difference of 250 mV.

Any excess current available, other than for the purposes

of DC biasing the IC, will be small. At low reference

voltage, the IC has limited performance.

When voltage VBB falls below 2.7 V, it is detected by the

receive dynamic limiter circuit connected to pin LSAO and

is continuously activated, discharging the capacitor

connected to pin DLC. In the DC condition, the

loudspeaker is then automatically disabled below this

voltage.

When VBB falls below 2.5 V, the TEA1098 is forced into a

low voltage mode irrespective of the logic input levels. This

is a speech mode with reduced performance which only

enables the microphone channel (between the MIC inputs

and pin 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 of typically 300 µA.

1999 Oct 14

9

Share Link: