ADS7819P

Analog To Digital Converters (ADC) Overview

The ADS7819P is a 12-bit CMOS analog-to-digital converter (ADC) manufactured by Texas Instruments. It features an 800kHz sampling rate with a 1.25μs throughput time and ±2.5V standard input range. The device integrates a sample/hold circuit, internal reference, clock, and three-state parallel output latches. It operates on dual supplies of +5V and -5V, consuming approximately 275mW at full speed. Key accuracy specifications include ±0.75 LSB maximum integral nonlinearity (INL) and ±1 LSB maximum differential nonlinearity (DNL).

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with 800kHz sampling rate and 1.25μs throughput.
• Integrated sample/hold, internal 2.5V reference, and clock generation.
• Standard ±2.5V input range with inherent overvoltage protection up to ±25V.
• Parallel data output with three-state drivers and latch capability.

Analog To Digital Converters (ADC) Applications

• High-speed data acquisition systems requiring 12-bit precision.
• Industrial process control applications utilizing bipolar input signals.
• Test and measurement equipment needing fast conversion cycles.
• Audio processing systems leveraging the specified dynamic range performance.

Analog To Digital Converters (ADC) Procurement Notes

Verify component status as the ADS7819P is listed as obsolete in official documentation. Confirm availability through authorized distributors or secondary markets. Ensure compatibility with existing PCB layouts for the 28-pin PDIP package before procurement. Check for RoHS compliance requirements if applicable to the target assembly process.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS7819P when a high-speed 12-bit ADC with a wide bipolar input range is required. The integrated internal reference simplifies design compared to external reference solutions. Consider the ±5V supply requirement and power dissipation of 275mW during thermal analysis. Verify that the parallel interface timing meets the system's microprocessor or DSP bus constraints.

Analog To Digital Converters (ADC) Part Context

The ADS7819 belongs to the Burr-Brown family of high-speed CMOS ADCs. It utilizes a successive approximation register (SAR) architecture with capacitor-based conversion. The device is designed for applications demanding low latency and high throughput without sacrificing linearity accuracy. It serves as a complete sampling solution by integrating necessary support circuits on-chip.

Analog To Digital Converters (ADC) Replacement Considerations

The ADS7819P is marked as obsolete. Potential replacements within the same family include the ADS7819U (SOIC package) or other high-speed SAR ADCs from Texas Instruments. Verify pinout compatibility and electrical specifications when substituting with newer generations of ADCs.

Analog To Digital Converters (ADC) FAQ

What is the maximum overvoltage protection level?

The ADS7819 provides inherent overvoltage protection up to ±25V on the analog input pins due to its internal resistive divider network.

How is the internal reference configured?

The internal 2.5V reference is enabled by default. A 10μF tantalum capacitor must be connected to the CAP pin (Pin 4) for stability, and a 0.1μF ceramic capacitor should decouple the REF pin (Pin 3).

What is the data format of the output?

The ADS7819 outputs data in Binary Two’s Complement format, with D11 being the Most Significant Bit (MSB) and D0 being the Least Significant Bit (LSB).