MX614P 查看數據表（PDF） - MX-COM Inc
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MX614P Datasheet PDF : 19 Pages
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Bell 202 Compatible Modem
0.025
7
MX614 PRELIMINARY INFORMATION
0
-0.025
-0.05
-0.075
-0.1
-0.125
-0.15
500
1000
1500 Frequency/Hz 2000
2500
Figure 3: Rx Equalizer Group Delay (RXEQ = '1') wrt 1700Hz
4.5 Energy Detector
This block operates by measuring the level of the signal at the output of the Receive Filter, and comparing it
against a preset threshold.
The DET output will be set high when the level has exceeded the threshold for a sufficient period of time.
Amplitude and time hysteresis are used to reduce chattering of the DET output in marginal conditions.
Note that this circuit may also respond to non-FSK signals such as speech.
Line Signal
DET
M0, M1
TeON
FSK signal
TeOFF
FSK Receive mode
See section 6.1 for definitions of TeON and TeOFF
Figure 4: FSK Level Detector Operation
4.6 FSK Demodulator
This block converts the 1200bps FSK input signal to a logic level received data signal which is output via the
RXD pin as long as the Data Retiming function is not enabled (see section 4.8). This output does not depend
on the state of the DET output.
When the Rx 1200bps mode is 'Off' or in 'ZP' the DET and RXD pins are held low.
Note that in the absence of a valid FSK signal, the demodulator may falsely interpret speech or other
extraneous signals as data. For this reason it is advised that the RXD pin is read only when data is expected.
2000 MX-COM, INC.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480162.004
4800 Bethania Station Road, Winston-Salem, NC 27105 USA
All Trademarks and Service Marks are held by their respective companies.
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