CMX605(1999) View Datasheet(PDF) - MX-COM Inc
Part Name
Description
Manufacturer
CMX605 Datasheet PDF : 22 Pages
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Digital Line to POTS Interface
8
CMX605 Preliminary Information
TX TONES Register Bits 4-7
D7
D6 D5 D4
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
Frequency
(Hz)
0 = OFF
540
660
780
900
1020
1140
-
1380
1500
1620
1740
1860
1980
-
-
TX TONES Register Bits 0-3
D3
D2
D1
D0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
Frequency
(Hz)
0 = OFF
540
660
780
900
1020
1140
-
1380
1500
1620
1740
1860
1980
-
-
Table 7: Tone Field 3, MODE Register bit 1 and bit 0 = ‘1’ and ‘1’ respectively
4.4 SPM Generator
This block operates independently and has its own output pin. It can transmit 12kHz or 16kHz and is
controlled by bit 4 of the SETUP Register. Bit 7 of the MODE Register is used to enable or disable this block.
The signal has a rise and fall time each of about 4.5ms. The SPM signal rises from the bias level to 0dBm in
16 steps of |2dB magnitude, and falls from 0dBm to bias level in 16 steps of |2dB magnitude.
4.5 Tx Signal Control
This block adjusts the amplitude of the FSK transmit signal output level, the level skew between DTMF tones,
and the signal routing to the output ports.
Output signal levels are proportional to VDD. The nominal output signal levels (at 0dB attenuation and
VDD = 5.0V) are:
Single Tone
Dual Tone (per tone)
DTMF High Frequency Tone
DTMF Low Frequency Tone
FSK Signal
0dBm
-3dBm
-3dBm
-5dBm
0dBm
The RING signal is digital: a square wave with amplitude of ≈ VDD peak to peak. When the RING signal is not
selected, the RING output pin is connected to VSS.
The level attenuator provides for level adjustment from 0dB to -14dB in -2dB steps. The typical level is
determined by bits 2 to 4 of the MODE Register as shown in Table 8.
©1999 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480195.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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