TEA1098TV/C1 データシートの表示（PDF） - Philips Electronics

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TEA1098TV/C1

Speech and handsfree IC

Philips Electronics 

Philips Semiconductors

Speech and handsfree IC

Product specification

TEA1098

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

not only affects 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.

Figure 4 shows that the internal circuit is supplied by pin

VBB, which combined with the line interface is a strong

supply point.

The line current through resistor RSLPE is sunk by the VBB

voltage stabilizer, and is suitable for supplying a

loudspeaker amplifier or any peripheral IC. Voltage VBB is

3.0 V at line currents below 18 mA and rises linearly to

5.3 V when the line current rises above 45 mA. It is

temperature compensated.

The current switch TR1-TR2 is intended to reduce

distortion of large AC line signals. Current ISLPE is supplied

to VBB via TR1 when the voltage on pin SLPE is above

VBB + 0.25 V. When the voltage on pin SLPE is below this

value, ISLPE is shunted to GND via TR2.

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 at

2% Total Harmonic Distortion (THD). The external resistor

does not affect the voltage on pin VBB; see Fig.5 for the

main DC voltages.

handbook, full pagewidLthN

REG

GND

SLPE

CREG

TP1

4.7 µF

R3

RSLPE

20 Ω

TR2

TR1

E1

D1

J1

R1

TN2

R2

from

J2

preamp

TN1

GND

Fig.4 Line interface principle.

GND

VBB

E2

D1

MGM298

1999 Oct 14

8

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