DESCRIPTION

The 73K224L is a highly integrated single-chip modem IC which provides the functions needed to construct a V.22bis compatible modem, capable of 2400 bit/s full-duplex operation over dial-up lines. The 73K224L offers excellent performance and a high level of functional integration in a single 28-pin DIP package.

FEATURES

• One-chip multi-mode V.22bis/V.22/V.21 and Bell 212A/103 compatible modem data pump

• FSK (300 bit/s), DPSK (600, 1200 bit/s), or QAM (2400 bit/s) encoding

• Pin and software compatible with other TERIDIAN Semiconductor Corporation K-Series 1-chip modems

• Interfaces directly with standard microcontrollers (80C51 typical)

• Parallel microcontroller busfor modem control and status monitoring functions

• Selectable asynch/synch with internal buffer/debuffer and scrambler/descrambler functions

• All synchronous and asynchronous operating modes (internal, external, slave)

• Adaptive equalization for optimum performance over all lines

• Programmable transmit attenuation (16 dB, 1 dB steps), selectable receive boost (+18 dB)

• Call progress, carrier, answer tone, unscrambled mark, S1, and signal quality monitors

• DTMF, answer and guard tone generators

• Test modes available: ALB, DL, RDL, Mark, Space, Alternating bit, S1 pattern

• CMOS technology for low power consumption (typically 100 mW @ 5V) with power-down mode (15 mW @ 5V)

• TTL and CMOS compatible inputs and outputs