ADS1201U-1

Overview

The ADS1201U is a precision, single-channel second-order delta-sigma modulator designed for high-resolution analog-to-digital conversion. Operating from a single +5V supply, it delivers a dynamic range exceeding 130dB with no missing codes. The device features fully differential inputs suitable for direct transducer connection and includes an internal 2.5V reference and bias generator. It utilizes a two-wire serial interface (MCLK/MOUT) and supports on-chip offset and gain calibration to maintain effective resolution of 20 bits at 1kHz bandwidth.

Feature Summary

• 130dB dynamic range with 24-bit resolution capability
• Fully differential analog input stage
• Internal 2.5V reference and VBIAS output
• On-chip self-calibration for offset and gain errors

Applications

• Industrial process control systems
• High-precision weigh scales
• Smart transmitters
• Portable instrumentation
• Pressure transducers

Procurement Notes

Verify the specific ordering suffix when purchasing. The base part number ADS1201U is supplied in rails (40 units), while the /1K suffix indicates tape and reel packaging (1000 units). Confirm RoHS compliance status and moisture sensitivity level (MSL 2) requirements for the manufacturing process.

Selection Notes

Select this component for applications requiring high dynamic range and low noise without an integrated digital filter. Ensure the host processor can implement the necessary digital filtering algorithms. Verify that the MCLK frequency aligns with the desired signal bandwidth and resolution trade-offs defined in the specifications table.

Part Context

Originally manufactured by Burr-Brown Corporation, the ADS1201 was acquired by Texas Instruments. The datasheet retains historical branding but is currently supported under the TI portfolio. The device remains active for new designs in the SOIC-16 package.

Replacement Considerations

ADS1201U/1K: Identical electrical specifications with tape and reel packaging instead of rail packaging.

FAQ

How does the ADS1201 handle input signals outside the 0V to 5V range?

By utilizing the internal VBIAS output (approximately 3.3V) and external resistor networks, the device can accept bipolar input signals such as ±10V.

What is the function of the CAL and GAIN/OFFSET pins?

These pins control the on-chip self-calibration sequence. Setting them appropriately allows the device to internally measure and store offset and gain error corrections.

Can the internal reference be disabled?

Yes, the REF EN pin can be set to LOW to disable the internal 2.5V reference, allowing the use of an external low-noise reference source at the REFIN pin.