Overview
The LC8920 is designed for synchronous, half-duplex, 9,600 bps CMOS single chip modem applications using public telephone networks. This LSI has built-in modulation-demodulation components meeting modem requirements, along with transmitter-receiver filters and V.24 interfacing. In addition, construction of Group 3 and Group 2 facsimile systems has been simplified.

Features
• CCITT recommendations
                  V.29 (9600 bps, 7200 bps and 4800 bps)
                  V.27ter (4800 bps and 2400 bps)
                  V.21ch2 (300 bps)
                  T.30, T.4 and T.3
• Supports high-speed (V.29 and V.27ter) and lowspeed (V.21ch2) simultaneous reception
• Half-duplex operation
• Capable of supporting Group 3 and Group 2 facsimiles
• Programmable signal tone generation and detection
• Programmable DTMF (Dual Tone Multi Frequency) generation and detection
• Built-in adaptive automatic equalizer
• Built-in amplitude equalizers (rink amplitude equalizer and cable amplitude equalizer)
• Built-in transmitter-receiver filter (digital filter)
• Supports transmit level adjustment (–0.5 dBm step intervals)
• Dynamic receiving range (–7 dBm to –43 dBm)
• Supports adjustment of transmit-receive sensitivity
• DTE (Data Terminal Equipment) interface Serial interface (conforming to CCITT recommended V.24) and parallel interface
• HDLC (High-level Data Link Control) framing function (during applications of CCITT recommended V.21 ch2)
• Programmable call progress tone detection
• Built-in eye-pattern generator
• Built-in diagnostic function
• Low consumption electric power (typ 250mW) and adopted CMOS (Complementary Metal Oxide Semiconductor)
• +5 V single power supply