Modem Analog Front-End

Use in Multiregional Applications with a Single Bill of Materials

Please check latest availability status for a specific part variant.


The 73M1903C 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 73M1903C device incorporates a digital host interface that is compatible with the serial ports found on most commercially available DSPs and processors and exchanges both payload and control information with the host. This interface can be configured as a single master/slave mode or as a daisy-chain mode that allows the user to connect up to eight 73M1903C devices to a single host for multiple AFE applications such as central server modems.

Key Features

  • Two Pairs of Software-Selectable Transmit Differential Outputs for Worldwide Impedance Driver Implementations
  • Up to 56kbps (V.92) Performance
  • Programmable Sample Rates (7.2kHz to 16.0kHz)
  • Reference Clock Range of 1MHz to 40MHz
  • Crystal Frequency Range of 4.9MHz to 27MHz
  • Master or Slave Mode Operation
  • Daisy-Chain Configurable Synchronous Serial Host Interface
  • Low Power Modes
  • Fully Differential Receiver and Transmitter
  • Drivers for Transformer Interface
  • 3.0V to 3.6V Operation
  • 5V Tolerant I/O
  • Industrial Temperature Range (-40°C to +85°C)
  • JATE-Compliant Transmit Spectrum


  • Automatic Teller Machines
  • Central Site Server Modems
  • Fax Machines
  • Game Consoles
  • Internet Appliances
  • Multifunction Peripherals (MFPs)
  • Personal Video Recorders (PVRs)
  • POS Terminals
  • Set-Top Boxes
Request Reliability Report for: 73M1903C 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >


Related Resources

Ultra-Wideband, Direct-Conversion, L-Band Satellite Tuner

  • 925MHz to 2175MHz Frequency Range
  • Monolithic VCO
  • High Dynamic Range: -75dBm to 0dBm

Type ID Title
Evaluation Board689473M1903C-EVM 73M1903C Evaluation Board