CMX605(1999) 데이터 시트보기 (PDF) - MX-COM Inc
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CMX605 Datasheet PDF : 22 Pages
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Digital Line to POTS Interface
5
CMX605 Preliminary Information
3 External Components
C2
XTAL 1
X1 XTAL/CLOCK 2
C1
SERIAL CLOCK 3
COMMAND DATA 4
REPLY DATA 5
VDD
CS 6
R1
IRQ 7
VSS 8
16 VDD
15 RING
VDD
C4
14 AMPOUT
13 IN-
CMX605 12 RXIN
11 VBIAS
C3
10 SPM
9 TONEFSK
C5
Figure 2: Recommended External Components
R1
100k:
X1 3.579545 MHz
C1, C2
C3
C4, C5
18pF
0.1µF
1.0µF
Table 2: Recommended External Components
Recommended External Component Notes:
1. Resistors ±5%, capacitors ±10% unless otherwise stated.
2. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at
least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To obtain
crystal oscillator design assistance, please consult your crystal manufacturer.
4 General Description
The CMX605 is a telecom tone generator and DTMF tone encoder/decoder. It has separate output ports for
the three different classes of signals encoded. These include Ringing signal, In-band tones or FSK data at
1200bps and High frequency metering pulses (SPM tones). It has a transmit level attenuator for In-band
tones or FSK data and an envelope control for SPM tones. It also has an uncommitted amplifier and uses the
industry standard 3.58MHz Xtal for its oscillator. These functions are controlled over a ‘C-BUS‘ serial µC
interface, which also carries the transmit FSK data and the DTMF decoded data.
The CMX605 should initially be reset by issuing a ‘C-BUS’ RESET command. Individual functions may be
disabled or enabled by the use of bits 5, 6 and 7 in the SETUP Register. See Section 4.9. Approximately
50ms should be allowed for the Tx dc level to settle at VBIAS before enabling the Tx functions (set bit 6 of the
MODE Register to ‘1’) after the CMX605 has been reset.
4.1 Xtal Osc and Clock Dividers
Frequency and timing accuracy of the CMX605 is determined by a 3.579545MHz clock present at the
XTAL/CLOCK pin. This may be generated by the on-chip oscillator inverter using the external components
C1, C2 and X1 of Figure 2, or may be supplied from an external source to the XTAL/CLOCK input. If the clock
is supplied from an external source, C1, C2 and X1 should not be fitted.
If the clock is provided by an external source which is not always running, then the CMX605 should be reset
when the clock is not available. Resetting the CMX605 will also turn off the on-chip oscillator. Failure to reset
the device may cause a rise in the supply current drawn by the CMX605.
4.2 Uncommitted Amplifier
This amplifier, with suitable external components, can be used either for adjusting the received signal to the
correct amplitude for the DTMF decoder or for adjusting the transmit signal level (for the line hybrid).
©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
All trademarks and service marks are held by their respective companies.
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