8-bit Analog-to-Digital Converter (ADC)

Key features

• Resolution: 8-bit (0–255)

• Channels: 8 analog inputs (IN0–IN7)

• Architecture: Successive Approximation (SAR)

• Input voltage range: 0 → Vref (typically 0–5 V)

• Package: DIP-28 (as in your image)

• Typical clock: 10 kHz – 1.28 MHz

What the markings mean

• ADC0808CCN →

  • ADC0808 = device

  • CCN = commercial temperature range, DIP package

• HJ940AB → batch / date / factory code (not functionally important)

Main pins (simplified)

• IN0–IN7 → Analog inputs

• A, B, C → Channel select (3-bit address)

• ALE → Address Latch Enable

• START → Start conversion

• EOC → End of Conversion

• OE → Output Enable

• D0–D7 → 8-bit digital output

• CLK → Clock input

• Vref+ / Vref- → Reference voltages

• Vcc / GND

Typical use cases

• Reading:

  • Potentiometers

  • Temperature sensors (LM35, NTC)

  • Light sensors (LDR)

  • Multiple analog sensors with one ADC

• Older Arduino / 8051 / Z80 based systems (before built-in ADCs were common)