TSC73M223 Datasheet, PDF (1/6 Pages) TDK Electronics – 1200 Baud FSK Modem

DESCRIPTION
The 73M223 modem device receives and transmits
serial and binary data over existing telephone
networks using Frequency Shift Keying (FSK). It
provides the filtering, modulation, and demodulation
to implement a serial, asynchronous data
communication channel. The 73M223 employs the
CCITT V.23 signaling frequencies of 1302 and 2097
Hz, operating at 1200 baud, and is intended for half
duplex operation over a two-line system.
The 73M223 provides a cost-effective alternative to
existing modem solutions. It is ideally suited for R.F.
data links, credit verification systems, point-of-sale
terminals, and remote process control.
CMOS technology ensures small size, low-power
consumption and enhanced reliability.
73M223
1200 Baud FSK Modem
FEATURES
February 1998
• Low cost FSK Modem
• 1200 baud operation
• CMOS switched capacitor technology
• Built-in self-test feature
• On-chip filtering, and
Modulation/Demodulation
• Uses CCITT V.23 frequencies
• On chip crystal oscillator
• Low power/High reliability
• Does not require a microprocessor
• 10 mW @ 5 V supply
• 16-pin plastic packages
BLOCK DIAGRAM
OSC1 13 14 OSC2
TXD
12
7(67
OSC
PROGRAMMABLE
DIGITAL
DIVIDER
DIGITAL
TIMING
SIGNALS
RXA 2
FIL 5
7(67
TEST
SLICER
DIGITAL
DEMODULATOR
RXF 4
SWITCHED CAP
BANDPASS
FILTER
7;
7
TEST
PHASE
COHERENT
WAVE
SYNTHESIZER
SYNC
PHASE LOCKED
LOOP
DIGITAL
LP
FILTER
DELAY
RANDOM
SEQUENCE
GENERATOR
7(67
TEST
3 CAP
1
VDD
8
VSS
16 TXA
15 CLK
9 SYNC
15 6<1
11 RXD
6 TEST