CMX860 查看數據表（PDF） - MX-COM Inc
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CMX860 Datasheet PDF : 36 Pages
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Telephone Signaling Transceiver
7
CMX860 Advance Information
3. External Components
C1 X1
DVDD DVDD
XTAL
C2
XTAL/CLOCK
DVSS
Ring
Detector
RDRV
DVSS
RD
RT
RESET
LINERXAMPOUT
Line
Interface
LINERX-
LINERX+
PHONERXAMPOUT
Phone
Interface
PHONERX-
PHONERX+
AVDD
DVDD
AVSS
1
28
2
27
3
26
4
25
5
24
6
23
7
22
CMX860
8 D6/D1 21
9
20
10
19
11
18
12
17
13
16
14
15
DVDD
R1
IRQ
REPLY DATA
SERIAL CLOCK
COMMAND DATA
'C-BUS'
to/from
µC
CS
HD
HT
AVDD
LINETX+
LINETX-
PHONETX+
PHONETX-
VBI AS
Hook
Detector
Line
Interface
Phone
Interface
C3
+
C6
C7
AVSS
AVSS
+
C5
C4
DVSS
DVSS
AVSS
AVSS
Figure 2: Recommended External Components for a Typical Application
R1
100kΩ
C1, C2
22pF
X1
11.0592MHz
C3, C4
100nF
or 12.288MHz
C5
10uF
Resistors ±5%, capacitors ±20% unless otherwise stated.
Table 2: Recommended External Components for a Typical Application
This device is capable of detecting and decoding small amplitude signals. To achieve this DVDD, AVDD, 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 both AVSS and DVSS ground planes in the
CMX860 area, as shown in Figure 3, with provision to make a link between them close to the CMX860. To
provide a low impedance connection to ground, the decoupling capacitors (C3-C7) must be mounted as close
to the CMX860 as possible and connected directly to their respective ground plane. This will be achieved
more easily by using surface mounted capacitors.
VBIAS is used as an internal reference for detecting and generating the various analog signals. It must be
carefully decoupled, to ensure its integrity. Apart from the decoupling capacitor shown (C3), no other loads
are allowed. If VBIAS needs to be used to set external analog levels, it must be buffered with a high input
impedance buffer. The DVSS connections to the Xtal oscillator capacitors C1 and C2 should also be of low
impedance and preferably be part of the DVSS ground plane to ensure reliable start up of the oscillator.
¤2000 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480222.001
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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