In modern days Microcontroller come with an analog-to-digital converter but there are a few instances where these peripheral supports are not available. One classic example is the 8051 series microcontroller units. In such cases, ADC0809 could provide an 8-bit Analog digital interface that can be very useful. It is also used with the Raspberry Pi as well.
 
The ADC0809 data acquisition component is based on the monolithic CMOS with an 8-bit analog-to-digital converter, 8-channel multiplexer, and microprocessor-compatible control logic. These 0809 converters feature a high-impedance chopper stabilized comparator, a 256R voltage divider with an analog switch tree, and a successive approximation register. The 8-channel multiplexer can directly access any of the 8-single-ended analog signals.
Input ranges from 0V to the input Vcc, could run through a single supply with 5V, has very low power operations limited to 15mW and the conversion Time is as fast as 100us.
 
ADC0809 features, specification
 
Features: -
This is an 8-bit analog-to-digital converter.
It is very easy to Interface with All Microprocessors
No Zero or Full-Scale Adjust Required for the operation
It has 8-channel Multiplexer with the Address Logic
Supports 0V to VCC Input Range
Outputs meet TTL Voltage Level Specifications
ADC0809 Equivalent to MM74C949-1
 
Specification: -
Resolution (Bits)                       8
Sample rate (Max) (kSPS)       10
Number of input channels           8
Interface                                    Parallel
Operating temperature range ( C )     -40 to 85
Package Group                     PLCC | 28  
Power consumption (Typ) (mW)        15
Architecture                               SAR   
Input type                            Single-Ended
Multi-channel configuration     Multiplexed
Input range (Max) (V)                   6
Input range (Min) (V)                    0
Analog voltage AVDD (Min) (V)         4.5
Analog voltage AVDD (Max) (V)        6
Digital supply (Min) (V)                 4.5
Digital supply (Max) (V)                  6
INL (Max) (+/-LSB)                     1.25
 
ADC0809 Applications:
Can be used with any MCU for A/D conversion
Sensor integrations
Raspberry Pi A/D conversion
Can be used with 8051 MCU units
Parallel multiplexed conversion
 
Additional Resources:
ADC0809 Datasheet
 
Package Contains
1x ADC0809