TCM3105NL Integrated Circuit

TCM3105NL Integrated Circuit

The TCM3105NL is a monolithic integrated circuit (IC) designed primarily as a single-chip FSK (Frequency Shift Keying) modem, commonly used for data transmission over telephone lines (Bell 202 or CCITT V.23 standards).

Here are the main technical specifications:

• Main function: 1200 baud FSK modem (half-duplex).
• Power supply ($V_{CC}$): Typically 4.5V to 5.5V (standard 5V TTL/CMOS).
• Operating frequencies (Bell 202 / V.23 standard):
  • Space: 2200 Hz
  • Mark: 1200 Hz
• Interface: Compatible with standard digital logic (TTL/CMOS) for Tx/Rx data.
• Integrated filters: Features internal band-pass filters for tone reception and generation, reducing the need for external components.
• Reference clock: Requires an external crystal or oscillator (usually 4.4336 MHz or 3.5795 MHz depending on the application standard).
• Package: Commonly available in DIP-16 (Plastic Dual In-line Package) or SOIC format.
• Operating temperature: Generally 0°C to +70°C (commercial version).