ADS7841P

Analog To Digital Converters (ADC) Overview

The ADS7841P is a 12-bit, 4-channel serial output sampling Analog-to-Digital Converter (ADC) manufactured by Texas Instruments. It utilizes a Successive Approximation Register (SAR) architecture and operates on a single supply voltage ranging from 2.7V to 5.25V. The device features a throughput rate of up to 200kHz at 5V operation and includes an internal multiplexer supporting four single-ended or two differential input channels. It offers programmable resolution between 8 and 12 bits via the MODE pin or control byte. Key performance metrics include ±2 LSB maximum Integral Nonlinearity (INL) and Differential Nonlinearity (DNL), with no missing codes guaranteed over the specified range. Power dissipation is typically 4.5mW at full speed with a 5V supply, reducing to under 15µW in shutdown mode.

Analog To Digital Converters (ADC) Feature Summary

• Integrated four-channel analog multiplexer supporting both single-ended and differential input configurations for flexible signal acquisition.
• Synchronous serial interface compatible with standard SPI protocols, allowing direct connection to microcontrollers and digital signal processors.
• Low power consumption with multiple operational modes including auto power-down and hardware shutdown for battery-operated applications.
• External reference voltage input allows adjustable input ranges from 100mV to VCC, providing flexibility for various signal levels.

Analog To Digital Converters (ADC) Applications

• Data acquisition systems requiring multi-channel monitoring
• Portable test and measurement equipment
• Industrial process control units
• Personal digital assistants and handheld devices
• Battery-powered sensor interfaces

Analog To Digital Converters (ADC) Procurement Notes

Verify the package designation matches the required form factor, as the 'P' suffix specifically indicates the DIP-16 package. Confirm the temperature grade corresponds to the application environment; the standard ADS7841P is rated for –40°C to +85°C, while the ES variant supports up to +125°C. Ensure the ordering number aligns with the desired transport media, such as rails for tube packaging. Cross-reference the datasheet revision to confirm pinout consistency if replacing older inventory.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS7841P when a 12-bit resolution and 4-channel multiplexing capability are required within a low-power constraint. Consider this component for designs needing a wide supply voltage range from 2.7V to 5V. Evaluate the external reference requirement against available board space and cost. If higher temperature operation above 85°C is necessary, verify if the ES grade is required instead. Ensure the serial interface timing meets the host processor's capabilities for 16-clock cycle conversions.

Analog To Digital Converters (ADC) Part Context

The ADS7841 belongs to the broader ADS7841 family of 12-bit SAR ADCs from Texas Instruments. It serves as a lower-cost alternative to the MAX1247. The family includes variants like the ADS7841E (SSOP-16) and ADS7841ES (extended temperature SSOP-16). The ADS7841P specifically denotes the through-hole DIP-16 version, maintaining identical electrical specifications to the surface-mount equivalents but differing only in physical package and mounting style.

Analog To Digital Converters (ADC) Replacement Considerations

The datasheet explicitly lists the MAX1247 as an alternate source. Designers should verify pin compatibility and software register definitions when substituting these parts. Other members of the ADS7841 family, such as the ADS7841E or ADS7841EB, offer the same electrical performance but in SSOP-16 packages, requiring PCB layout adjustments for footprints.