UBA2050 データシートの表示（PDF） - Philips Electronics

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UBA2050

One-chip telephone ICs with speech, dialler and ringer functions

Philips Electronics 

Philips Semiconductors

One-chip telephone ICs with speech,

dialler and ringer functions

Product specification

UBA2050(A); UBA2051(A;C)

Internal supply (pin VCC)

The internal transmission part circuitry is supplied from

VCC. This supply voltage is derived from the voltage on

pin LN by means of resistor RCC and must be decoupled

by capacitor CVCC connected between pins VCC and GND.

This supply point may also be used to supply peripheral

circuits e.g. an electret microphone taking into account the

supply possibilities according to Fig.8.

The voltage VCC (see Fig.9) depends on the current

consumed by the transmission part and the peripheral

circuits:

VCC = VCC0 − RCC × (IP + IREC)

where:

VCC0 = VLN − ICC × RCC

IREC = the current consumed by the output stage of the

earpiece amplifier.

handbook, full pagewidth

Rexch

Vexch

Rline

Iline

RCC

LN

SUPPLY TRANSMISSION PART

from preamp

VCC

ISUP

ICC

CVCC

IP

100 µF

supply

electret

microphone

VDD

REGULATOR

VDD

IDD

DIALLER/

RINGER

REG

SLPE GND

UBA205xx

ringer-

interface/

peripherals

CREG 4.7 µF

ISLPE

RSLPE

20 Ω

220

CVDD µF

FCA129

Fig.7 Supply configuration.

2000 May 19

9

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