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MX614P

Bell 202 Compatible Modem

MX-COM Inc  

Bell 202 Compatible Modem

8

MX614 PRELIMINARY INFORMATION

4.7 FSK Modulator and Transmit Filter

These blocks produce a tone according to the TXD, M0 and M1 inputs as shown in the table below, assuming

data retiming is not being used:

M1 M0 TXD = 0 TXD = 1

1

1

-

-

1

0

0Hz[1]

387Hz

0

0

487Hz

387Hz

0

1 2200Hz 1200Hz

Note: [1] TXOUT held at approx. VDD/2.

When modulated at the appropriate baud rates, the Transmit Filter and associated external components (see

section 5.1) limit the FSK out of band energy sent to the line in accordance with Figure 5 and Figure 6,

assuming that the signal on the line is at -6dBm or less.

0

dBm

-10

-20

-30

-40

-50

-60

-70

10

3400 Hz

250 Hz

1300 Hz

28 kHz

100

1000

10000 Frequency / Hz

Figure 5: Tx limits at 5bps and 150bps rate

100000

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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