NEC D1703C-016

NEC D1703C-016 (often listed as uPD1703C-016) is a Phase-Locked Loop (PLL) frequency synthesizer and controller designed primarily for AM (MW/LW) and FM radio tuners. It belongs to a legacy series of NEC integrated circuits used in audio equipment for precise frequency management and digital tuning. 

Technical Details

• Manufacturer: NEC (Japan)
• Part Number: D1703C 016 (μPD1703C family)
• Package Type: 28-pin DIP (Dual In-line Package)
• Function: It belongs to a family of 4-bit CMOS microcontrollers designed for digital tuning systems (DTS) with a built-in PLL frequency synthesizer.
• Batch/ID: The code E1640K-124 is likely a production batch or date code specific to the manufacturing run.