ADC0804 8-Bit Microprocessor Compatible A/D Converter
8-bit successive approximation analog-to-digital converter designed to interface directly with microprocessor buses via tri-state outputs and control strobes (~RD, ~WR).
Aliase:ADC0804LCN, 8-Bit ADC, Microprocessor ADC
DIP-20 Top View
20 Pins
Pinout Table20
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | ~CS | Digital | Chip Select (Active Low) |
| 2 | ~RD | Digital | Read Strobe (Active Low to enable data outputs) |
| 3 | ~WR | Digital | Write Strobe / Start Conversion (Active Low pulse) |
| 4 | CLKIN | Digital | External Clock Input / RC Oscillator Pin |
| 5 | ~INTR | Digital | Interrupt Output (Active Low on conversion complete) |
| 6 | VIN(+) | Analog | Analog Non-Inverting Input |
| 7 | VIN(-) | Analog | Analog Inverting Differential Input |
| 8 | AGND | Ground | Analog Ground (0V) |
| 9 | VREF/2 | Analog | Reference Voltage / 2 Input (Defaults to VCC/2 if open) |
| 10 | DGND | Ground | Digital Ground (0V) |
| 11 | DB7 | Digital | Data Bus Bit 7 (MSB, 3-State) |
| 12 | DB6 | Digital | Data Bus Bit 6 (3-State) |
| 13 | DB5 | Digital | Data Bus Bit 5 (3-State) |
| 14 | DB4 | Digital | Data Bus Bit 4 (3-State) |
| 15 | DB3 | Digital | Data Bus Bit 3 (3-State) |
| 16 | DB2 | Digital | Data Bus Bit 2 (3-State) |
| 17 | DB1 | Digital | Data Bus Bit 1 (3-State) |
| 18 | DB0 | Digital | Data Bus Bit 0 (LSB, 3-State) |
| 19 | CLKR | Analog | Internal Clock Generator Resistor Connection |
| 20 | VCC | Power | Positive Supply Voltage (+5V ±5%) |