MX867D2 데이터 시트보기 (PDF) - MX-COM Inc
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MX867D2 Datasheet PDF : 42 Pages
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Low Power V.22 Modem
5
CMX867 Advance Information
3 External Components
C1
XTAL
C2
X1
XTAL/CLOCK
RDRV
VSS
RD
Ring Detector
See Section 3.1
RT
VDD
VSS
RXAFB
Rx Line Interface
See Section 3.2
+
VDD
C5
C4
RXA
RXA
VSS
1
24
2
23
3
22
4
21
5
20
6 CMX867 19
7
18
8
17
9
16
10
15
11
14
12
13
VDD
VDD
R1
IRQ
REPLY DATA
VSS
SERIAL CLOCK
COMMAND DATA
CS
C-BUS
to/from
µC
VSS
VDD
TXA
TXA
VBIAS
C3
Tx Line Interface
See Section 3.2
Figure 2: Recommended External Components for Typical Applciation
R1
100kΩ
C5
10uF
C1, C2 22pF
X1
11.0592MHz or 12.288MHz
C3, C4 100nF
Resistors ±5%, capacitors ±20% unless otherwise stated.
Table 2: Recommended External Components for typical Application
Note:
1. This device is capable of detecting and decoding small amplitude signals. To achieve this VDD and VBIAS
should be decoupled and the receive path protected from extraneous in-band signals. It is recommended
that the printed circuit board be laid out with a VSS ground plane in the CMX867 area to provide a low
impedance connection between the VSS pins and the VDD and VBIAS decoupling capacitors. The VSS
connections to the Xtal oscillator capacitors C1 and C2 should also be low impedance and preferably be
part of the VSS ground plane to ensure reliable start up of the oscillator.
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.
2000 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480219.001
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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