EM92547DN Ver la hoja de datos (PDF) - ELAN Microelectronics

Número de pieza

componentes Descripción

Fabricante

EM92547DN

CALLER ID FSK DECODER

ELAN Microelectronics 

EM92547A/B/D

CALLER ID FSK DECODER

Pin Descriptions

Symbol

TIP

RING

RING DET1

RING DET2

SHORTDATA

/RING TIME

/PWR UP

VSS

OSCOUT

OSCIN

CLK SELECT

/RD

/CD

DATA OUT

VDD

NC

I/O Function

I This input is connected to the tip line of the twisted pair.

I This input is connected to the ring line of the twisted pair.

I This input is coupled to one end of the line through an attenuation

network. It is used to detect the occurrence of a valid ring signal.

I This input is coupled to the other end of the line through an

attenuation network.

O Data output pin without preamble message.

O A RC network should be connected to this pin. The RC time

constant is chosen to hold this pin voltage below 2.2V between

the peaks of the ringing signal.

I This active low input sets the chip into power up. When high, the

chip is put into a power down mode in the absence of a ring

signal. In this mode, only the ring detect circuitry is active.

Ground.

O This pin connects to the other side of the crystal oscillator.

I This pin connects to 3.58MHz crystal oscillator or 455kHz

resonator. It can also be used as an external clock input.

I A logic '1' on this pin to select 3.58MHz crystal oscillator, logic '0'

to select 455kHz resonator.

O (ring detector)(active low)This output detects the presence of a

valid ring signal.

O (carrier detect)(active low)This output indicates the presence of

in-band signals at the device input.

O The demodulated FSK data is output to this pin.

Power Supply Voltage.

Non Connected.

Function Descriptions

The EM92547 is a CMOS device designed to support the Caller Number Deliver

feature, which is offered by the Regional Bell Operating Companies. The EM92547 CLID

comprises two paths: the signal path and the ring indicator path. The signal path consists of

an input differential buffer; a band pass filter, an FSK demodulator and a data valid with

carrier detect circuit. The ring detector path includes a clock generator, a ring detect circuit

and a power-up logic circuit.

In a typical application, the ring detector maintains the line continuously while all

other functions of the chip are inhibited. If a ring signal is sent, the ring detector wakes up

the oscillator and the main bias generator. This in turn activates the rest of the IC. Once

activated, a valid signal RI (ring indicator) is sent.

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* This specification are subject to be changed without notice.

1998

~3~

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