ADC0809CCV

Analog To Digital Converters (ADC) Overview

The ADC0809CCV is an 8-bit analog-to-digital converter (ADC) manufactured by Texas Instruments, housed in a 28-pin Plastic Leadless Chip Carrier (PLCC) package. It integrates an 8-channel single-ended analog multiplexer with address logic and latched TTL-compatible tri-state outputs. Utilizing successive approximation architecture, the device operates on a single 5 VDC supply with a typical conversion time of 100 μs at a 640 kHz clock frequency. The component supports ratiometric or fixed reference operation, eliminating the need for external zero or full-scale adjustments.

Analog To Digital Converters (ADC) Feature Summary

• 8-Bit Resolution: Converts analog signals into 256 discrete digital levels using a 256R resistor ladder network to ensure monotonicity without missing codes.
• Integrated Multiplexer: Features an 8-channel analog multiplexer with address decoding logic (ADDA, ADDB, ADDC) to select specific input channels.
• Microprocessor Compatibility: Includes latched address inputs and tri-state data outputs that interface directly with standard microprocessors like the 8080, 8085, and Z-80.
• Low Power Consumption: Designed for CMOS technology with a typical power dissipation of 15 mW during operation.

Analog To Digital Converters (ADC) Applications

• Industrial process control systems requiring multi-channel temperature or pressure monitoring.
• Machine control interfaces for reading sensor data from multiple points.
• Consumer electronics utilizing proportional relationship measurements such as potentiometer position sensing.
• Automotive applications involving analog signal acquisition from vehicle sensors.

Analog To Digital Converters (ADC) Procurement Notes

Verify the manufacturing status before procurement, as the ADC0808/09 series has been subject to lifecycle changes including lifetime buy periods. Confirm RoHS compliance requirements, noting that non-NOPB versions may not meet current environmental standards. Ensure the PLCC footprint matches the target PCB design, specifically checking the 11.51x11.51 mm dimensions and J-lead configuration.

Analog To Digital Converters (ADC) Selection Notes

Select the ADC0809CCV when an 8-channel multiplexed input is required for 8-bit resolution applications. Choose this part over the ADC0808 if the specific output bit ordering or internal switch characteristics align with the system design, although functional differences are minimal. Ensure the application can provide a stable 5V supply and a clock signal between 10 kHz and 1280 kHz. Verify that the analog input impedance and voltage range fit within the specified 0V to VCC limits.

Analog To Digital Converters (ADC) Part Context

The ADC0809 is part of the ADC0808/ADC0809 family of 8-bit microprocessor-compatible A/D converters. It is functionally similar to the MM74C949-1. While the ADC0808 and ADC0809 share identical core specifications, they differ slightly in internal pinout and output bit ordering. The ADC0809 is often preferred in simulation environments like Proteus where the ADC0808 model might be unavailable, though both serve the same data acquisition role.

Analog To Digital Converters (ADC) Replacement Considerations

The ADC0808 is a direct functional equivalent with minor pinout differences. For modern replacements, consider higher-resolution ADCs with I2C/SPI interfaces, but note that these will require significant software and hardware redesign due to the lack of native parallel bus compatibility found in the ADC0809.