ADS1254E datasheet by Texas Instruments

ADS1254E Frequently Asked Questions (FAQs)

• What is the recommended layout and routing for the ADS1254E?
  The ADS1254E requires careful PCB layout and routing to minimize noise and ensure accurate conversions. TI recommends a 4-layer PCB with a solid ground plane, and to keep analog and digital traces separate. Additionally, use short, direct traces for the analog inputs and avoid crossing digital and analog traces.
• How do I optimize the ADS1254E's performance for low-noise applications?
  To optimize the ADS1254E for low-noise applications, use a low-noise voltage reference, such as the REF5025, and ensure a stable power supply. Additionally, use a low-pass filter on the analog inputs, and consider using a shielded enclosure to reduce electromagnetic interference (EMI).
• What is the maximum sampling rate for the ADS1254E?
  The ADS1254E can sample at up to 30,000 samples per second (SPS) for a single channel, and up to 15,000 SPS for multiple channels. However, the actual sampling rate may be limited by the system's clock frequency and the number of channels being sampled.
• How do I calibrate the ADS1254E for optimal performance?
  The ADS1254E has an internal calibration mechanism that can be initiated through the CAL pin. Additionally, users can perform external calibration by applying a known input voltage and adjusting the offset and gain registers accordingly. TI recommends recalibrating the device after power-up and after any changes to the system's operating conditions.
• What is the ADS1254E's analog input impedance, and how does it affect the system design?
  The ADS1254E's analog input impedance is approximately 10 kΩ. This relatively high impedance requires careful consideration of the input signal's source impedance and the use of a suitable input buffer amplifier if necessary, to ensure accurate conversions and prevent signal attenuation.