TEA1098TV View Datasheet(PDF) - Philips Electronics

Part Name

Description

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TEA1098TV

Speech and handsfree IC

Philips Electronics 

Philips Semiconductors

Speech and handsfree IC

Product specification

TEA1098A

As can be seen from Fig.3, the internal circuitry is supplied

by pin VBB, which is a strong supply point combined with

the line interface. The line current is flowing through the

RSLPE resistor and is sunk by the VBB voltage stabilizer,

thus becoming available for a loudspeaker amplifier or any

peripheral IC. Its voltage is equal to 3.0 V for line currents

lower than 18 mA. It than increases linearly with the line

current and reaches the value of 5.3 V for line currents

greater than 45 mA. It is temperature compensated.

The aim of the current switch TR1 and TR2 is to reduce

distortion of large AC line signals. Current ISLPE is supplied

to VBB via TR1 when the voltage on SLPE is greater than

VBB + 0.25 V. When the voltage on SLPE is lower than this

value, the current ISLPE is shunted to GND via TR2.

The reference voltage Vref can be increased by connecting

an external resistor between pins REG and SLPE.

For large line currents, this increase can slightly affect

some dynamic performances such as maximum signal

level on the line for 2% THD. The voltage on pin VBB is not

affected by this external resistor; see Fig.4 for the main DC

voltages.

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.4 Main DC voltages.

VDD SUPPLY FOR MICROCONTROLLER (PIN VDD)

The voltage on the VDD supply point follows the voltage on

VBB with a difference typically equal to 250 mV and is

internally limited to 3.35 V. This voltage is temperature

compensated. This supply point can provide a current up

to 3 mA typically. Its internal consumption stays low (a few

10 nA) as long as VDD does not exceed 1.5 V.

VDD can also be used as an input; in this case the voltage

will be stabilised to 3.35 V up to 75 mA input current.

VBB and VDD can supply external circuits in the limit of

currents provided from the line, taking into account the

internal current consumption.

2000 Aug 18

8

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