TEA1098AH Просмотр технического описания (PDF) - Philips Electronics

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TEA1098AH

Speech and handsfree IC

Philips Electronics 

Philips Semiconductors

Speech and handsfree IC

Preliminary specification

TEA1098A

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

TEA1098AH

33 EARO

32 DTMF

31 MIC+

30 MIC−

29 GNDTX

28 TXI

27 GATX

26 TXO

25 IDT

24 SWT

23 n.c.

FCA142

Fig.3 Pin configuration (TEA1098AH).

FUNCTIONAL DESCRIPTION

All data given in this chapter are typical values, except

when otherwise specified.

Supplies

LINE INTERFACE AND INTERNAL SUPPLY (PINS LN, SLPE,

REG AND VBB)

The supply for the TEA1098A 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

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

current and reaches the value of 6.1 V for line currents

higher than 45 mA. For line currents below 9 mA, the

internal reference voltage generating Vref is automatically

adjusted to a lower value. This is the so-called low voltage

area and the TEA1098A has limited performances in this

area (see Section “Low voltage behaviour”). This

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 means of a capacitor 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 and 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

The preferred value for RSLPE is 20 Ω. Changing this value

will affect more than the DC characteristics; it also

influences the transmit gains to the line, the gain control

characteristic, the sidetone level and the maximum output

swing on the line.

2000 Mar 21

7

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