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I NTEGRATED C IRCUITS D IVISION
Applications
Figure 1 is a schematic of the CPC2400E in a
typical host system application. The host system
communicates to the CPC2400E through a standard
V.24 serial interface. Refer to the Pinout and
Definitions section for functional descriptions of the
pins. The transmit and receive data is sent over the
TXD and RXD pins. The -DCD and -DTR pins are
used for handshaking. The audio output pin, A1 is
used for monitoring the analog data and can be
amplified to drive a speaker. The -MUTE can be used
to enable or disable the speaker.
+5V
VCC
CPC2400E
The ferrite beads FB1 and FB2 may be required to
reduce EMI emissions per FCC Part 15. Determining
the value for the ferrite beads depends solely on the
emissions generated by the end user product.
Figure 2 is a schematic of the CPC2400E in a
standalone RS232C configuration. This circuit uses
the Linear Technologies LT1181A RS232 line driver.
Note that the LT1181A line driver inverts the signals.
Both figures 1 and 2 are for reference purposes only.
Exact component values should be determined by the
user.
HOST
SYSTEM
TXD
RXD
-DCD
-DTR
CPC2410E
MODEM
TIP
FB1
-MUTE
A1
RING
FB2
TELEPHONE
LINE
GND
SPEAKER
AUDIO AMP
Figure 1. CPC2400E System Environment
+5V
17
+5V
VCC
14
15
16
17
18
19
20
21
22
23
24
25
1
2
3
4
5
6
7
8
9
10
11
12
13
TXD
RXD
8
9
15
14
3
7
LT1181A
11
10
13
12
2
4
5
6
18
TXD
RXD
CPC2400E
MODEM
GND
FB1
FB2
TIP
RING
TELEPHONE
LINE
16
DB25F
RS232 DRIVER
Figure 2. Stand Alone Modem with RS232C Interface
6
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