ADS1201U-1/1K

Overview

The ADS1201U-1/1K is a single-channel, second-order delta-sigma modulator manufactured by Texas Instruments. It operates from a single +5V supply and features fully differential analog inputs suitable for direct transducer connection. The device provides a dynamic range exceeding 130dB and supports effective resolution of 20 bits at a 1kHz bandwidth with a 320kHz modulator rate. It includes an internal 2.5V reference and a bias generator, housed in a 16-lead SOIC package.

Feature Summary

• 130dB dynamic range with 24-bit no missing codes capability
• Fully differential input stage ideal for low-level signals
• Internal 2.5V reference and VBIAS output generator
• On-chip offset and gain calibration functions

Applications

• Industrial process control
• Weigh scales
• Smart transmitters
• Pressure transducers

Procurement Notes

Verify the '/1K' suffix indicates tape and reel packaging containing 1000 devices per reel. Confirm RoHS compliance status and moisture sensitivity level (MSL Level-2) prior to procurement. Ensure the active status is current as the component may have lifecycle changes.

Selection Notes

Select this modulator when high resolution is required with external digital filtering. Ensure DVDD does not exceed AVDD to prevent damage. Verify that the external processor can implement the necessary sinc filter to achieve the specified 20-bit effective resolution at 1kHz bandwidth.

Part Context

This part belongs to the ADS1201 family of precision delta-sigma modulators. The 'U' designation indicates the SOIC-16 package variant, while '/1K' specifies the tape and reel shipping quantity. It is designed for applications requiring high accuracy without integrated digital filtering.

Replacement Considerations

ADS1201U/1KG4 is a verified lead-free replacement within the same package and electrical specifications.

FAQ

What is the maximum current allowed into or out of the VBIAS pin?

The maximum current into or out of the VBIAS pin should not exceed 10mA.

How is the internal reference disabled?

The internal reference is disabled by setting the REFEN pin to LOW, which reduces the analog supply current by approximately 1.6mA.

What is the relationship between VBIAS and the reference voltage?

The VBIAS output voltage is approximately 1.33 times the reference input voltage (VREF).