CMX878 查看數據表（PDF） - CML Microsystems Plc
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CMX878 Datasheet PDF : 61 Pages
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Line Powered Modem plus DAA
CMX878
1.3 Signal List
CMX878
D1/D6/E1
packages
Pin No.
1
Signal
Description
Name
XTALN
Type
O/P The output of the on-chip Xtal oscillator inverter.
2
XTAL/CLOCK I/P The input to the oscillator inverter from the Xtal
circuit or external clock source.
3
DVSS
Power The negative supply rail for the digital on-chip
blocks.
4
WAKE
I/P A 0 to 1 transition on this pin can be used to
wake the device.
5
RD
I/P Schmitt trigger input to the Ring signal detector.
Connect to VSS if Ring Detector not used.
6
RT
BI Open drain output and Schmitt trigger input
forming part of the Ring signal detector.
Connect to SBYVDD if Ring Detector not used.
7
SBYVDD
Power The positive rail of the low current Standby
Supply. This supply will normally remain
present even when the regulated supply has
been de-powered.
8
VFB
O/P Forms part of the regulator feedback loop.
9
REGENAB O/P A logic output used to enable the regulator.
This pin is powered from the Standby Supply
and will take the level of SBYVDD when high.
10
AVDD
Power The positive rail of the regulated power supply.
11
MOD
O/P The modulation signals generated by the device
are output at this pin.
12
RXIN
I/P The inverting input to the Rx Input Amplifier.
13
RXFB
O/P The output of the Rx Input Amplifier.
14
AVss
Power The negative supply rail for the analogue on-
chip blocks.
15
VBIAS
I/P Internally generated bias voltage of
approximately AVDD/2. It will discharge to Vss
when in powersave mode or when the regulated
supply is de-powered.
16
ADCIN
I/P The input to the Analogue to Digital Converter.
Used in line voltage measurement and detection
of extensions going off-hook.
17
ICTRL
O/P The output of the programmable DAC. Used for
programming a current drawn from the line.
18
GYON
O/P A logic output used to enable the gyrator.
19
CLID Z EN O/P A logic output. Could be used in circuits with
Caller Line ID provision to switch in a line
matching impedance.
© 2002 Consumer Microcircuits Limited
6
D/878/2
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