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

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производитель

TEA1098H/C2

Speech and handsfree IC

Philips Electronics 

Philips Semiconductors

Speech and handsfree IC

Product specification

TEA1098

handbook, full pagewidth

HFRX 1

TNOI 2

TENV 3

TSEN 4

RNOI 5

RSEN 6

RENV 7

DLC 8

n.c. 9

VBB 10

GALS 11

TEA1098H

33 QR

32 DTMF

31 MIC+

30 MIC−

29 GNDTX

28 TXIN

27 GATX

26 TXOUT

25 IDT

24 SWT

23 VOL

FCA020

Fig.3 Pin configuration (TEA1098H).

FUNCTIONAL DESCRIPTION

All data values given in this chapter are typical, except

when otherwise specified.

Supplies

LINE INTERFACE AND INTERNAL SUPPLY (PINS LN, SLPE,

REG AND VBB)

The supply for the TEA1098 and its peripherals is obtained

from the line. The IC generates a stabilized reference

voltage (Vref) between pins SLPE and GND.

This reference voltage is equal to 3.7 V for line currents

below 18 mA. When the line current rises above 45 mA,

the reference voltage rises linearly to 6.1 V. For line

currents below 9 mA, Vref is automatically adjusted to a

lower value. The performance of the TEA1098 in this

so-called low voltage area is limited (see Section “Low

voltage behaviour”). The reference voltage is temperature

compensated.

The voltage between pins SLPE and REG is used by the

internal regulator to generate the stabilized reference

voltage and is decoupled by a capacitor connected

between pins LN and REG. This capacitor, converted into

an equivalent inductance realizes the set impedance

conversion from its DC value (RSLPE) to its AC value (done

by an external impedance).

The IC regulates the line voltage at pin LN which can be

calculated as follows:

VLN = Vref + RSLPE × ISLPE

ISLPE = Iline – Ix

where:

Iline = line current.

Ix = current consumed on pin LN (approximately a

few µA).

ISLPE = current flowing through the RSLPE resistor.

1999 Oct 14

7

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