ADS1254WDBQEP

Overview

The ADS1254WDBQEP is a 24-bit, low-power analog-to-digital converter (ADC) utilizing delta-sigma architecture. It features four differential inputs and supports data rates up to 20 kHz with an effective resolution of 19 bits. The device operates with separate analog (AVDD: 4.75 V to 5.25 V) and digital (DVDD: 1.8 V to 3.6 V) power supplies. Key electrical characteristics include a maximum integral non-linearity of ±0.0078% FSR over the extended temperature range and a common-mode rejection ratio of 64 dB at –55°C to 115°C. It employs a serial interface for communication and includes a power-down mode.

Feature Summary

• 24-bit resolution with no missing codes and 19-bit effective resolution up to 20 kHz
• Four fully differential analog input channels with external reference support (0.5 V to 5 V)
• Extended operating temperature range from –55°C to 115°C
• Low power consumption of 4.3 mW to 6.5 mW at 20 kHz

Applications

• Cardiac diagnostics
• Blood analysis systems
• Infrared pyrometers
• Liquid/gas chromatography
• Precision process control

Procurement Notes

Verify that the component matches the specific military/aerospace qualification requirements associated with the -EP suffix. Confirm the SSOP-20 package dimensions and pinout compatibility with the target PCB layout. Ensure supply chain traceability meets defense or aerospace standards as indicated by the product documentation.

Selection Notes

Select this component when high-resolution measurement is required in harsh environments due to its –55°C to 115°C operating range. The separate digital supply allows for flexible logic level interfacing. Designers must account for the 1920 system clock cycles required for the digital filter to fully settle after any significant analog input step change.

Part Context

This part belongs to the Texas Instruments ADS1254 family of precision ADCs. The 'W' indicates the wide temperature variant, 'DBQ' specifies the SSOP-20 package, and 'EP' denotes an enhanced product designed for defense, aerospace, and medical applications with controlled baseline manufacturing and extended lifecycle support.

Replacement Considerations

The ADS1254E/2K5 is a commercial-grade alternative within the same family but lacks the extended temperature range (-40°C to 85°C vs -55°C to 115°C) and the specific EP reliability controls.