The ADC0804 is a monolithic integrated analog-to-digital converter that utilizes a CMOS process. It is packaged in a 20-pin IC with an 8-bit resolution, a conversion time of 100μs, and an input voltage range from 0 to 5V. The chip features a three-state output data latch, allowing it to be directly connected to a microcontroller's data bus for seamless integration.
As shown in the figure, the ADC0804 is a single-chip A/D converter designed for easy use in various applications:
Below are the functions of each pin:
- **VIN(+), VIN(-)**: These are the analog input terminals that can handle unipolar, bipolar, or differential signals.
- **DB7–DB0**: These are the 8-bit digital output lines with three-state functionality, allowing them to interface directly with a microprocessor.
- **AGND**: Analog ground reference for the input signals.
- **DGND**: Digital ground reference for the internal circuitry.
- **CLK**: Clock signal input used to synchronize the conversion process.
- **CLKR**: External resistor used with the CLK pin to set the internal clock frequency, which is calculated as 1/(1.1RC).
- **CS#**: Chip select signal, active low, which enables the ADC0804 to start operation.
- **WR#**: Write signal, active low, which initiates the A/D conversion.
- **RD#**: Read signal, active low, which allows the microcontroller to read the converted digital data.
- **INTR#**: Interrupt signal, active low, indicating that the conversion has completed.
- **VREF/2**: Reference voltage input that defines the quantization step size.
- **VCC**: Power supply input, typically 5V.
By referring to the ADC0804 datasheet, you can find typical connection diagrams for proper implementation:
You can also simulate the ADC0804’s operation using electronic design software to better understand its timing and behavior:
In summary, the ADC0804 is a versatile and widely used A/D converter that simplifies the integration of analog signals into digital systems. Its straightforward pinout, ease of configuration, and compatibility with microcontrollers make it a popular choice in many embedded applications. Whether you're designing a sensor interface, a control system, or a data acquisition module, the ADC0804 offers reliable performance at an affordable cost.
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