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