ADS1220IPW vs ADS1203IPWRG4

The ADS1220IPW is a 24-bit, 4-channel delta-sigma analog-to-digital converter (ADC) with an integrated programmable gain amplifier (PGA), internal voltage reference, and SPI interface, designed for precision sensor measurement. The ADS1203IPWRG4 is a 16-bit, single-channel delta-sigma modulator that outputs a 1-bit data stream for isolated or FPGA-based signal processing, without an integrated PGA or internal reference. They serve different signal-chain architectures and are not functionally equivalent.

No. The ADS1220IPW is supplied in a 16-pin TSSOP (PW) package, while the ADS1203IPWRG4 is supplied in a 16-pin TSSOP (PW) package as well, but the pin functions and internal architecture differ significantly. The ADS1220IPW provides SPI communication, analog inputs, reference pins, and PGA-related functions, whereas the ADS1203IPWRG4 provides modulator clock input, data output, and analog input pins. Pin-to-pin substitution is not supported without circuit redesign.

The ADS1220IPW provides 24-bit resolution with a digital SPI output in binary two's complement format, suitable for direct microcontroller interfacing. The ADS1203IPWRG4 is a 16-bit delta-sigma modulator that outputs a 1-bit serial data stream (bitstream) at a rate determined by the external modulator clock, requiring digital filtering (e.g., sinc filter) in an FPGA or DSP to reconstruct the 16-bit result. The output formats are fundamentally different and not directly interchangeable.

The ADS1220IPW operates from an analog supply (AVDD) of 2.3 V to 5.5 V and a digital supply (DVDD) of 2.3 V to 5.5 V. The ADS1203IPWRG4 operates from a single 5 V supply (4.5 V to 5.5 V) for both analog and digital sections. While both can operate at 5 V, the ADS1220IPW supports lower supply voltages down to 2.3 V, whereas the ADS1203IPWRG4 requires a nominal 5 V supply. Supply compatibility must be verified against the specific system rail.

The ADS1203IPWRG4 is specifically designed for isolated signal acquisition because its 1-bit modulator output can be transmitted across an isolation barrier (e.g., via a digital isolator) and reconstructed by a digital filter on the isolated or non-isolated side. The ADS1220IPW integrates the ADC and digital filter on a single die and outputs parallel SPI data, which would require isolating multiple SPI lines. For galvanically isolated measurement systems, the ADS1203IPWRG4 architecture is generally preferred.

No. The ADS1220IPW includes an integrated low-noise PGA with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128 V/V, allowing direct connection of low-level sensors such as thermocouples and RTDs. The ADS1203IPWRG4 does not include a PGA; it provides a fixed analog input range and requires external signal conditioning or amplification before the modulator input. This is a critical difference for sensor interface design.

The ADS1220IPW is typically used in precision sensor measurement applications such as temperature sensing (RTD, thermocouple, thermistor), pressure sensors, flow meters, and portable instrumentation where high resolution and integrated PGA are required. The ADS1203IPWRG4 is typically used in motor control current sensing, isolated shunt-based measurement, power monitoring, and applications requiring a modulator output for FPGA or DSP-based digital filtering. Application suitability depends on the signal chain architecture.

No. Despite both being 16-pin TSSOP devices, they differ in resolution (24-bit vs 16-bit modulator), output interface (SPI vs 1-bit bitstream), integrated PGA (present vs absent), internal reference (present vs absent), and supply requirements. A direct drop-in replacement is not possible; any substitution requires a complete review of the signal chain, digital interface, filtering, and PCB layout against the respective manufacturer datasheets.