參數(shù)資料
型號(hào)： EM78810
廠商： ELAN Microelctronics Corp .
英文描述： 8-Bit Micro-Controller for Telecom Product(工作電壓2.5V-6V的8位呼叫識(shí)別的RISC型微控制器)
中文描述： 8位微控制器的電信產(chǎn)品（工作電壓為2.5V到6V的8位呼叫識(shí)別的的RISC型微控制器）
文件頁(yè)數(shù)： 18/31頁(yè)
文件大?。?/td> 191K
代理商： EM78810
* This specification are subject to be changed without notice.
18
9.30.1997
EM78810
8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
FSK FUNCTION
Fig13. FSK Block Diagram
Function Descriptions
The CALLER ID IC is a CMOS device designed to support the Caller Number Deliver feature which is offered
by the Regional Bell Operating Companies.The FSK block comprises two paths: the signal path and the ring
indicator path. The signal path consist 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 /RD(ring detected) is sent.
A /FSKPWR input is provided to activate the block regardless of the presence of a power ring signal. If /FSKPWR
is sent low, the IC can still power itself up whenever it detects a valid ring signal, but will back to its normal power-
down mode after a time period.
The input buffer accepts a differential AC coupled input signal through the TIP and RING input and feeds this
signal to a band pass filter. Once the signal is filtered, the FSK demodulator decodes the information and sends
it to a post filter. The output data is then made available at DATA OUT pin. This data, as sent by the central office,
includes the header information (alternate “1” and “0”) and 150 ms of marking which precedes the date , time
and calling number. If no data is present, the DATA OUT pin is held in a high state. This is accomplished by an
carrier detect circuit which determines if the in-band energy is high enough. If the incoming signal is valid and
thus the demodulated data is transferred to DATA OUT pin . If it is not, then the FSK demodulator is blocked.
Ring
Det
Circuit
Ring det1
Ring det2
/Ring Time
Tip
Ring
Power
Up
Logic
FSK
demodul
Data Valid
Energy Det
Circuit
OSC in
OSC out
(1)
(1)
/RD
/FSKPWR
Band Pass
Filter
Power
/RD
/CD
DATA OUT
CLK gen
-
+
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