ADC0808 IC: Datasheet, Pinout and Usage

ADC0808 Pinout

ADC0808 Symbol

ADC0808 Footprint

ADC0808 3D Model

The ADC0808 IC is a typical ADC module for projects that require an external ADC. It's a 28-pin 8-bit ADC module with eight channels. It can measure up to eight ADC values from 0 to 5V, with a precision of 19.53mV when the voltage reference (Vref –pin 9) is +5V. (Step size).

Texas Instruments ADC0808CCN technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments ADC0808CCN.

• Easy to interface with all Microprocessors or works Standalone.

• The eight-channel 8-bit ADC module

• Can measure up to 8 Analog values seamlessly

• On-chip Clock not available, external Oscillator is needed (Clock)

• The digital output varies from 0 to 255, Operating power is 15mW, conversion time 100us

• When Vref = 5V, for every 19.53mV of analogue value there will be the rise of one bit on the digital side (Step size)

• Available in 28-pin PDIP, SOIC packages

• Operates With Any 8-Bit (µP) Processors or as a Stand-Alone Device

• Can measure up to eight-channel hence can be used for complex projects

• Available in smaller packages for its performance, hence used in portable electronics.

• Widely used with Raspberry Pi, Beagle Bone and other MPU development platforms

• Interface to Temp Sensors, Voltage Sources, and Transducers

ADC0808 Block Diagram

The ADC0808 IC is a typical ADC module for projects that require an external ADC. It's a 28-pin 8-bit ADC module with eight channels. It can measure up to eight ADC values from 0 to 5V, with a precision of 19.53mV when the voltage reference (Vref –pin 9) is +5V. (Step size). That is, for every 19.53mV rise on the input side, the output side will increase by one bit.

This IC is ideal for usage with microprocessors such as the Raspberry Pi, Beaglebone, and other similar devices. Alternatively, it can be used as a stand-alone ADC module. Every ADC module needs a clock to work, and this IC needs an external clock pulse to function. 

Because the ADC0808 IC can measure up to eight analogue voltages and lacks an inbuilt clock, it requires somewhat more components to function than its predecessor, the ADC0804. +5V can be used to power the IC. To obtain the output, the Vref + and the Output enable should both be powered up to +5V. When the V ref + is powered with +5V, the IC will operate with a step size of 19.53mV. The external clock, which can be an oscillator circuit or a pulse generated by an MCU/MPU, should be linked to the clock pin.

Pins IN1 to IN7 can receive the correct analogue voltage, however, the IC can only read the voltage of one channel at a time. The pins ADD A, ADD B and ADD C can be used to select the channel. To access the relevant analogue channel, these three bits must be set as given in the table below. Once the channel has been established, it should be activated by briefly driving the Address latch enabled (ALE) pin high.

ADC0808-Analog Channel Selection

The analogue voltage should be connected to the V in(+) pin, and the digital output will be produced from pins 2-1 (OUT 1) to 2-8 (OUT 8) as illustrated in the diagram. For the ADC conversion to work, another end of the voltage source (sensor/module) must also be grounded to the circuit. Now, in order for the ADC conversion to begin, we must set the START pin to high as soon as the EOC pin is set to high. This can be accomplished either through programming or by connecting the EOC pin to the START pin as seen in the circuit below.

How to use ADC0808

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Download datasheets and manufacturer documentation for Texas Instruments ADC0808CCN.