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
2 Signal List
4
CMX605 Preliminary Information
CMX605
D4/P3
Pin No.
1
2
Signal
Name
XTAL
XTAL/CLOCK
3
SERIAL
CLOCK
4
COMMAND
DATA
5
REPLY DATA
6
CS
7
IRQ
8
VSS
9
TONEFSK
10
SPM
11
VBIAS
12
RXIN
13
IN-
14
AMPOUT
15
RING
16
VDD
Type
output
input
input
input
tri-state
input
output
power
output
output
input
input
output
output
power
Description
The output of the on-chip Xtal oscillator inverter.
The input to the oscillator inverter from the Xtal circuit or
external clock source.
The ‘C-BUS’ serial clock input from the host µC.
See Section 4.8
The ‘C-BUS’ serial data input from the host µC.
A 3-state ‘C-BUS’ serial data output to the host µC. This
output is high impedance when not sending data to the host
µC.
Chip Select. The ‘C-BUS’ transfer control input provided by
the host µC.
A ‘wire-ORable’ output for connection to a host µC Interrupt
Request input. This output is pulled down to VSS when active
and is high impedance when inactive. An external pull-up
resistor is required.
The negative supply rail (ground).
The sinewave output of the Tones and FSK signal
generators.
The sinewave output of the SPM signal generator.
An internally generated bias voltage of VDD/2, except when
the device has been reset, VBIAS will discharge to VSS. It
should be bypassed to VSS by a capacitor mounted close to
the device pins.
The input to the DTMF decoder, internally biased at VDD/2. It
should be AC coupled.
The inverting input to the uncommitted amplifier.
The output of the uncommitted amplifier.
The squarewave output of the Ringing Signal generator.
The positive supply rail. Levels and thresholds within the
device are proportional to this voltage. It should be bypassed
to VSS by a capacitor mounted close to the device pins.
This device is capable of detecting and decoding small amplitude signals. To achieve this, VDD and VBIAS
decoupling and protection of the receive path from extraneous in-band signals are very important. It is
recommended that the printed circuit board is laid out with a ground plane in the CMX605 area to provide a
low impedance connection between the VSS pin and the VDD and VBIAS bypass capacitors.
Table 1: Signal List
©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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