CMX624 Просмотр технического описания (PDF) - CML Microsystems Plc
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CMX624 Datasheet PDF : 26 Pages
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V23 / Bell 202 Modem
CMX624
CMX624
D2/D5/P4
Signal
Description
Pin No.
Name
Type
16
RXN
I/P The inverting input to the Rx input amplifier.
17
RXO
O/P The output of the Rx input amplifier.
18
RT
BI Open drain output and Schmitt trigger input
forming part of the Ring Signal detector.
19
RD
I/P Schmitt trigger input to the Ring Signal Detector.
20
-
NC No connection should be made to this pin.
21
-
NC No connection should be made to this pin.
22
-
NC No connection should be made to this pin if the
printed circuit board is to be used for CMX624
only. If the board is also to be used for
CMX644A, a capacitor should be connected as
shown in Figure 2.
23
-
I/P No connection should be made to this pin if the
printed circuit board is to be used for CMX624
only. If the board is also to be used for
CMX644A, a capacitor should be connected as
shown in Figure 2.
24
VDD
Power The positive supply rail. Levels and thresholds
within the device are proportional to this voltage.
Should be decoupled to VSS by a capacitor
mounted close to the device pins.
Notes:
I/P
= Input
O/P = Output
BI
= Bidirectional
T/S = 3-state Output
NC
= No Connection
This device is capable of detecting and decoding small amplitude signals. To achieve this VDD and VBIAS
decoupling and protecting 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 CMX624 area to provide
a low impedance connection between the VSS pin and the VDD and VBIAS decoupling capacitors.
2003 CML Microsystems Plc
5
D/624/7
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