ADS1231IDR vs ADS1201UG4

The ADS1231IDR is a 24-bit delta-sigma analog-to-digital converter optimized for bridge sensor applications, integrating a low-noise PGA and internal oscillator in an 8-pin SOIC package. The ADS1201UG4 is a 24-bit delta-sigma modulator that outputs a 1-bit serial bitstream for isolated signal conditioning, housed in a 16-pin SOIC package. The ADS1231IDR provides a complete ADC solution with digital filter and serial interface, while the ADS1201UG4 requires an external digital filter and clock source.

No. The ADS1231IDR is supplied in an 8-pin SOIC (D) package, whereas the ADS1201UG4 is supplied in a 16-pin SOIC (DW) package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.

The ADS1231IDR operates from a single analog supply of 2.7 V to 5.3 V. The ADS1201UG4 operates from a 5 V analog supply (AVDD = 5 V) with a separate digital supply (DVDD) of 2.7 V to 5.5 V. While both can operate with a 5 V analog rail, the ADS1231IDR supports lower analog supply voltages down to 2.7 V, which the ADS1201UG4 does not.

The ADS1231IDR provides a two-wire serial interface (SCLK and DOUT/DRDY) that outputs fully filtered 24-bit conversion results directly. The ADS1201UG4 outputs a 1-bit delta-sigma modulated bitstream that must be processed by an external digital filter, such as an FPGA or DSP, to obtain a 24-bit result. This makes the ADS1231IDR suitable for standalone ADC designs, while the ADS1201UG4 is intended for isolated or high-speed modulator applications.

The ADS1231IDR includes an internal oscillator, eliminating the need for an external clock in most applications. The ADS1201UG4 requires an external clock input (CLKIN) to operate; it does not include an internal oscillator. This is a critical difference when considering system-level component count and design complexity.

The ADS1231IDR achieves 24-bit resolution with low noise performance optimized for bridge sensors, with datasheet RMS noise specifications typically in the range of tens of nanovolts to microvolts depending on gain and data rate settings. The ADS1201UG4 provides 24-bit resolution as a modulator, with its effective resolution determined by the external digital filter and clock frequency. Designers should consult the respective manufacturer datasheets for exact noise tables under specific operating conditions.

The ADS1201UG4 is specifically designed for isolated signal conditioning because its 1-bit modulator output can be transmitted across an isolation barrier using a digital isolator, with filtering performed on the isolated or non-isolated side. The ADS1231IDR, with its integrated digital filter and two-wire interface, is better suited for non-isolated bridge sensor applications where a complete ADC solution is desired.

No. Due to differences in package pinout, supply voltage requirements, clock architecture, and output interface, the two devices are not interchangeable without a complete redesign of the PCB, power supply, and digital interface. The ADS1231IDR provides a complete ADC with filtered output, while the ADS1201UG4 requires external clocking and digital filtering, so substitution requires validation against the specific system architecture.