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DESCRIPTION
The TDK 73M1903 Analog Front End (AFE) IC includes fully differential hybrid driver outputs, which connect to the telephone line interface through a transformer-based DAA. The receive pins are also fully differential for maximum flexibility and performance. This arrangement allows for the design of a high performance hybrid circuit to improve signal to noise performance under low receive level conditions, and compatibility with any standard transformer intended for PSTN communications applications.
The device incorporates a programmable sample rate circuit to support soft modem and DSP based implementations of all speeds up to V.92 (56Kbps). The sampling rates supported are from 7.2kHz to 14.4kHz by programming pre-scaler NCO and PLL NCO.
73M1903 Datasheet
