ADS1243SJD

Overview

The ADS1243SJD is a 24-bit analog-to-digital converter (ADC) from Texas Instruments, utilizing sigma-delta architecture. It features four differential input channels and supports SPI and 3-wire serial interfaces. The device operates on analog and digital supply voltages ranging from 2.7 V to 5.25 V. Key performance metrics include a maximum sampling rate of 15 S/s, integral nonlinearity of +/- 0.0015% FSR, and differential nonlinearity of +/- 1 LSB. It offers programmable gain amplifier functionality, GPIOs, and 50/60 Hz rejection capabilities. The component is housed in a CDIP-SB-20 package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• High-resolution 24-bit data conversion with low noise sigma-delta modulation
• Integrated programmable gain amplifier for flexible signal conditioning
• Built-in 50/60 Hz line frequency rejection filters
• General-purpose input/output pins for system control

Applications

• Industrial process control systems requiring high precision
• Weigh scales and load cell measurements
• Medical instrumentation such as ECG and blood pressure monitors
• Strain gauge and thermocouple signal acquisition

Procurement Notes

Verify the specific suffix 'SJD' against the official Texas Instruments datasheet to confirm the ceramic dual in-line package variant and commercial grade temperature rating. Ensure compatibility with existing board layouts for the CDIP-SB-20 footprint. Cross-reference pin assignments and electrical characteristics with the latest published documentation to avoid integration errors during procurement.

Selection Notes

Select this component when designing systems that require high accuracy with minimal external components. The integrated PGA reduces the need for discrete amplifiers. Consider the 24-bit resolution and low sampling rate suitability for static or slow-varying signals. Verify power supply constraints align with the 2.7 V to 5.25 V operating range and ensure thermal management meets the -40°C to +85°C specification.

Part Context

The ADS1243 belongs to the ADS124x family of precision ADCs designed for low-noise applications. It shares architectural similarities with the ADS1240 and ADS1242 but provides four differential channels. This series is widely used in industrial and medical fields where high channel count and precision are critical. The SJD suffix specifically denotes the ceramic DIP package option within this product line.

Replacement Considerations

Direct substitutes include the ADS1240, ADS1242, and ADS1244 from Texas Instruments, which share similar pinouts and functionalities. Other compatible options may include the LTC2485 or LTC2495 from Analog Devices, though interface and pin configurations should be verified. Always consult manufacturer cross-reference guides for definitive replacement validation.