IC ADC 8BIT SAR 20DIP The ADC0804 is CMOS 8-bit successive Interfacing Logic Needed – Access Time 135 ns approximation converter (ADC). This post will unlock more details about ADC0804. Furthermore, huge range of Semiconductors, Capacitors, Resistors and ICs in stock. Welcome RFQ.
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Sep 18, 2021
Maggie Judson
How To Make Analog to Digital VOLTAGE Converter through ADC 0804 IC || ADC Voltage Converter || Easy
IC ADC 8BIT SAR 20DIP
The ADC0804 is CMOS 8-bit successive Interfacing Logic Needed – Access Time 135 ns approximation converter (ADC). This post will unlock more details about ADC0804. Furthermore, huge range of Semiconductors, Capacitors, Resistors and ICs in stock. Welcome RFQ.
ADC0804LCN
ADC0804 Pinout
| Pin Number | Pin Name | Description |
| 1 | Chip Select (CS) | Chip select is used if more than 1 ADC module is used. By default grounded |
| 2 | Read (RD) | Read pin must be grounded to read the Analog value |
| 3 | Write (WR) | Write pin should be pulsed high to start data conversion |
| 4 | CLK IN | An external clock can be connected here, else RC can be used for accessing the internal clock |
| 5 | Interrupt (INTR) | Goes high for interrupt request. |
| 6 | Vin (+) | Differential Analog input +. Connect to ADC input |
| 7 | Vin (-) | Differential Analog input -. Connect to ground |
| 8 | Ground | Analog Ground pin connected to the ground of the circuit |
| 9 | Vref/2 | Reference voltage for ADC conversion. |
| 10 | Ground | Digital Ground pin connected to the ground of the circuit |
| 11 to 18 | Data bit 0 to bit 7 | Seven output Data bit pins from which output is obtained |
| 19 | CLK R | RC timing resistor input pin for internal clock gen |
| 20 | Vcc | Powers the ADC module, use +5V |
Pin Description
The ADC0804 is a CMOS 8-Bit, successive approximation A/D converter that uses a modified potentiometric ladder and is designed to operate with the 8080A control bus via three-state outputs. These converters appear to the processor as memory locations or I/O ports, and hence no interfacing logic is required.
ADC0804 Symbol
ADC0804 Footprint
ADC0804 3D Model
Texas Instruments ADC0804LCN technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments ADC0804LCN.
Texas Instruments ADC0804LCN technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments ADC0804LCN.
| Product Attribute | Attribute Value | |
|---|---|---|
| Mount | Through Hole | |
| Mounting Type | Through Hole | |
| Package / Case | 20-DIP (0.300, 7.62mm) | |
| Number of Pins | 20Pins | |
| Operating Temperature | 0°C~70°C | |
| Packaging | Tube | |
| JESD-609 Code | e0 | |
| Part Status | Obsolete | |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | |
| Number of Terminations | 20Terminations | |
| ECCN Code | EAR99 | |
| Terminal Finish | Tin/Lead (Sn/Pb) | |
| Max Power Dissipation | 875mW | |
| Terminal Position | DUAL | |
| Number of Functions | 1Function | |
| Supply Voltage | 5V | |
| Terminal Pitch | 2.54mm |
| Product Attribute | Attribute Value | |
|---|---|---|
| Base Part Number | ADC0804 | |
| Pin Count | 20 | |
| Operating Supply Voltage | 5V | |
| Polarity | Unipolar | |
| Power Supplies | 5V | |
| Configuration | ADC | |
| Number of Channels | 1Channel | |
| Max Supply Voltage | 6.3V | |
| Min Supply Voltage | 4.5V | |
| Power Dissipation | 875mW | |
| Number of Bits | 8Bits | |
| Input Type | Differential | |
| Architecture | SAR | |
| Supply Type | Single | |
| Reference Type | External, Supply | |
| Data Interface | Parallel | |
| Resolution | 1 B |
| Product Attribute | Attribute Value | |
|---|---|---|
| Sampling Rate | 10 ksps | |
| Voltage - Supply, Analog | 4.5V~6.3V | |
| Voltage - Supply, Digital | 4.5V~6.3V | |
| Number of Analog In Channels | 1Analog In Channel | |
| Sampling Rate (Per Second) | 10k | |
| Output Bit Code | BINARY | |
| Power Consumption | 5.5mW | |
| Linearity Error-Max (EL) | 0.3906% | |
| Conversion Rate | 10 ksps | |
| Height | 3.3mm | |
| Length | 26.42mm | |
| Width | 6.6mm | |
| REACH SVHC | No SVHC | |
| Radiation Hardening | No | |
| RoHS Status | Non-RoHS Compliant | |
| Lead Free | Contains Lead |
Easy to interface with all Microprocessors or works Stand-alone.
The single-channel 8-bit ADC module
On-chip Clock available, no need for external Oscillator(Clock)
Digital output various from 0 to 255
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 20-pin PDIP, SOIC packages
ADC0804 Functional Block Diagram
• Operates With Any 8-Bit µP Processors or as a Stand-Alone Device
• Interface to Temp Sensors, Voltage Sources, and Transducers
The equivalents for ADC0804: ADC0808, ADC modules.
The ADC0804 is a commonly used ADC module, for projects where an external ADC is required. It is a 20-pin Single channel 8-bit ADC module. Meaning it can measure one ADC value from 0V to 5V and the precision when voltage reference (Vref –pin 9) is +5V is 19.53mV (Step size). That is for every increase of 19.53mV on the input side there will be an increase of 1 bit on the output side.
This IC is very Ideal to use with Microprocessors like Raspberry Pi, Beagle bone etc.. Or even to use as a standalone ADC module.
Since the IC comes with an internal clock we do not need many components to make it work. However to make the internal clockwork we have to use an RC circuit. The IC should be powered by +5V and both ground pins should be tied to circuit ground. To design the RC circuit simply use a resistor of value 10k and a capacitor of 100pf (approx) and connect them to CLK R and CLK IN pins as shown in the circuit below. The chip select (CS) and Read (R) pin should also be grounded. The Vref pin is left free because by default without any connection it will be connected to +5V.
The digital output will be obtained from the pins DB0 to DB7 and the analogue voltage should be connected to V in(+) pin as shown in the circuit. Also, note that another end of the voltage source (sensor/module) should also be grounded to the circuit for the ADC conversion to work. Now, for the ADC Conversion to start, we have o make the Write(WR) pin go high momentary this can be done by connecting the pin to the I/O of MPU and toggling it high before every ADC read. Only if this is done the ADC value on the output side will be updated.
How to use ADC0804
In the above circuit, I have used a potentiometer to feed in a variable voltage of 0V to 5V to the Vin pin and the present Voltage is read using a voltmeter. As you can see in the image the voltage value is 1.55V and the resulting binary value is 01001111. Let us see how this binary value can be converted to an Analog value since we will need it while programming/designing.
Binary Value = 01001111
Converting to Decimal = (0*128)+(1*64)+(0*32)+(0*16)+(1*8)+(1*4)+(1*2)+(1*1)
= 79
Analog Voltage = Decimal Value * Step size
= 79 * 19.53mV
= 1.54V
The obtained value is 1.54V and the measured voltage is 1.55V which are very much close. So this is how you use an ADC0804 IC.
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Download datasheets and manufacturer documentation for Texas Instruments ADC0804LCN.
Download datasheets and manufacturer documentation for ADC0804LCN
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