Part Number: ADC0804LCN

Manufacturer: Texas Instruments

Description: IC ADC 8BIT SAR 20DIP

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Technical Specifications of ADC0804LCN

Datasheet  ADC0804LCN datasheet
Category Integrated Circuits (ICs)
Family Data Acquisition – Analog to Digital Converters (ADC)
Manufacturer Texas Instruments
Packaging Tube
Part Status Active
Number of Bits 8
Sampling Rate (Per Second) 10k
Number of Inputs 1
Input Type Differential
Data Interface Parallel
Configuration ADC
Ratio – S/H:ADC
Number of A/D Converters 1
Architecture SAR
Reference Type External, Supply
Voltage – Supply, Analog 4.5 V ~ 6.3 V
Voltage – Supply, Digital 4.5 V ~ 6.3 V
Operating Temperature 0°C ~ 70°C
Package / Case 20-DIP (0.300″, 7.62mm)
Supplier Device Package 20-DIP

The ADC0804 is an 8-bit IC that can simultaneously take readings from up to 8 analog inputs. In other words, the range of the digital output is 0-255. A converter based on the differential potentiometric ladder is used to make successive approximations.

Every device cannot do every operation. Devices that can conduct one set of operations and transform them into a format usable by another group of devices are never in short supply. The primary challenge we confront is the translation of data between various devices.

Most innovations in electronics have resulted from the need for gadgets to communicate effectively with one another so that they can work with two or more distinct items or devices.

Why Is ADC Necessary?

The results of any number of past and future occurrences can be expressed mathematically. There is no discrete representation for these mathematical values. In other words, we can state that these numbers always have a beginning and an end but that there is an endless range of possible values.

In the temporal domain, these values are intuitive (real life). Most people aren’t good readers, including machines and other modern gadgets. They might be able to read the beginning or the conclusion, but they usually can’t. The frequency domain is the operational environment for all mechanical and electronic equipment. Typically, A/D Converters are employed to address such problems (ADC).

What Is ADC0804LCN

Several different ADCs are available for digitizing analog signals for microprocessors and controllers. Other “ADCs” have various advantages and features depending on the situation. The low voltage 8-bit analog to Digital Converter, or “ADC0804 IC,” will be discussed in this article.

The ADC0804 is an 8-bit IC designed to convert low-voltage analog signals into digital form. It accepts inputs between 0 and 5 Volts, has single Analog information, and 8 outputs. Even though the ADC0804 has its built-in clock, we can utilize the external clock to increase or decrease the frequency of the clock. Whether using an internal or external clock, we can’t exceed a conversion speed of 110us.

Pinout of ADC0804

Pinout of ADC0804

  1. CS:It stands for Chip select. The gadget is activated using the CS Pin. This pin is used to choose the appropriate device when employing several ADCs. It is functioning in a minimal state.
  2. RD:It represents reading. It’s a pin for input. When requesting the output value from the internal register, we use the RD pin. The surgery will be carried out with High to Low pulses.
  3. WR:The word means “write.” A high to low pulse is applied to the WR input pin to initiate the conversion.
  4. CLK IN:This input pin is used to represent the clock. This pin is used to apply the external clock.
  5. INTR: It serves as an interrupt pin to signal when conversion is finished. Once the conversion is complete, it drops.
  6. Vin (+): The non-inverting signal is input via an analog pin. We use this pin as an analogue input because most devices provide analogue signals in the non-inverting form.
  7. Vin (-): It is a pin for inverting signals on an analog input device. Because signals are typically non-inverting in nature, this pin connects to the ground.
  8. AGND: This pin serves as the device’s ground and is where the analogue input was received.
  9. View: It is a reference for the voltage for the present full-scale reading.
  10. DGND: The component’s ground where the digital output is connected to this pin.
  11. DB0 – DB7: These pins are utilized for 8-bit digital output.
  12. CLK R:This pin uses the internal clock for RC timing.
  13. VCC:It serves as the source of power for the entire IC. The voltage shouldn’t be more than +6.5 Volts. It uses mainly +5.0 Volts.

Internal Circuit

ADC0804, like many other electronic devices, has an internal circuit that is a little complex. The analog-to-digital converter ADC0804 employs a wide variety of logic components—including gates, flip-flops, decoders, shift registers tri-states, latches, clocks, ladders, etc.— to convert analog signals to digital. But the SAR Latch is the primary component of ADC0804 for signal conversion.

Binary searching across all available quantization/mapping levels allows SAR Latch to transform a continuous analog signal into a digital signal/discrete signal. The “ADC0804” also uses other parts to produce the correct output in response to the input. When waiting for a high-to-low pulse, data can be temporarily stored in a tri-state register. The result is serialized using an 8-bit shift register so that it can be read by other devices expecting a binary representation.

ADC0804 Features

  • All 5 V microcontrollers and CPUs will work fine with it.
  • Using only a 5 V supply, it could figure out any voltage between 0 and 5.
  • Adaptable to use with a variety of power sources. We recommend a minimum of 2.5 V.
  • Completely compatible with CMOS and TTL electronic circuitry.
  • 640 kilohertz is the frequency of the internal clock.
  • Zero-adjustment functionality is achieved.
  • The time to convert is at least 110us.
  • Includes the customary 0.3-inch wide, 20-pin DIP package
  • Feature analog voltage input with differential polarity.
  • The input voltage can be between 2.5 and 6.5 volts, while the digital out range is 0 to 255.
  • Function independently thanks to its built-in 8-bit Microprocessor.
  • One digital bit is added for every 19.53mV increase in comparable value when Vref = 5V.

Application and Use Cases ADC0804

Any time we get an analog value with a Potential Difference between 2.5 and 6.5, we can use an ADC0804. Some requirements must be met before we may use the ADC0804. The Vcc pin will be connected to a 5 V DC power source, and the GND pin will be grounded.

The device can be activated by connecting the ground to the CS pin. Applying ground to the RD and WR pins will make the device readable and writable for data. They connect a 10K resistor and 100pF capacitor to the clock pin, forming the RC circuit necessary for using the internal clock. These specifications are what allow the ADC0804 to function.


An ADC0804 integrated circuit (IC) performs the task of transforming analog voltage input into a digital representation of that value. It can convert analog signals to digital signals on its own. Although revolutionary at the time, modern analog-to-digital converters offer greater versatility, reduced power consumption, output in various formats, and smaller form factors, making the older technology obsolete.

For more details or purchase of ADC0804 integrated circuit (IC), contact us aT ICRFQ. We are the best distributors of IC and electronic components in China.

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