73K324BL
CCITT V.22bis,V.23,V.22,V.21, Bell 212A
Single-Chip Modem w/ Integrated Hybrid
DATA SHEET
PIN DESCRIPTION (continued)
ANALOG INTERFACE AND OSCILLATOR
NAME
PIN
TYPE
DESCRIPTION
RXA
32
I
Received modulated analog signal input from the telephone
line interface.
TXA1 / TXA 2
18 / 17
O
(differential) Transmit Analog. These pins provide the analog
output signals to be transmitted to the telephone line. The
drivers will differentially drive the impedance of the line
transformer and the line matching resistor. An external hybrid
can also be built using TXA1 as a single ended transmit
signal.
XTL1 / XTL2
3 / 4
27
I
These pins are for the internal crystal oscillator requiring a
11.0592 MHz parallel mode crystal. Load capacitors should
be connected from XTL1 and XTL2 to ground. XTL2 can also
be driven from an external clock.
OH
O
OFF-HOOK RELAY DRIVER: This signal is an open drain
output capable of sinking 40 mA and is used for controlling a
relay. The output is the complement of the OH register bit in
the ID Register.
.
Page: 8 of 34
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 6.1
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