Texas Instruments ADS1220IPWR

Overview

ADS1220IPWR from Texas Instruments is a 24-bit, low-power, delta-sigma analog-to-digital converter with integrated PGA (gain 1–128), dual programmable current sources (10 µA–1.5 mA), internal 2.048 V reference (5 ppm/°C drift), and SPI interface. It supports up to 2 kSPS, 20-bit effective resolution, and simultaneous 50/60 Hz rejection at 20 SPS - optimized for precision sensor signal acquisition in industrial field transmitters and PLC analog input modules.

For engineers reviewing the ADS1220IPWR datasheet, ADS1220IPWR pinout, ADS1220IPWR application, or ADS1220IPWR equivalent, this page delivers verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options - all grounded in TI's SBAS501D production data sheet (May 2026 revision).

Technical Context

The ADS1220IPWR implements a 24-bit delta-sigma modulator with single-cycle settling digital filter, enabling true 2 kSPS throughput without latency penalties. Its flexible MUX supports two differential or four single-ended inputs, and the low-noise PGA can be bypassed to retain high input impedance while supporting gains of 1–4 for single-ended configurations.

Integrated features include dual matched IDACs for RTD excitation, an on-chip temperature sensor (±0.5°C accuracy), internal oscillator (±1% accuracy), and low-side power switch (RON = 5.5 Ω). All operate across –40°C to +125°C with AVDD/DVDD supply range of 2.3 V to 5.5 V.

Key Specifications

Pinout & Package

The ADS1220IPWR is supplied in a leadless VQFN-16 (RVA) package, 3.5 mm × 3.5 mm, with exposed thermal pad (to be connected to AVSS or left floating per TI guidelines).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision delta-sigma ADC applications.

Compared with ADS122U04IPWR and ADS1219IPWR, the ADS1220IPWR uniquely combines SPI timing control, integrated signal conditioning (PGA + IDACs), and simultaneous 50/60 Hz rejection - making it the only option among the three capable of standalone, high-fidelity sensor front-end implementation in industrial and medical systems.

Availability

ADS1220IPWR is available at Aetrix Electronics and suitable for field transmitters, PLC analog input modules, and patient monitoring systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS1220IPWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data conversion and industrial signal chain solutions.

The ADS1220 product line targets high-accuracy, low-power sensor interface applications - specifically engineered to replace multi-component discrete front ends in temperature, pressure, and strain measurement systems.

FAQ

What is the maximum achievable effective resolution of the ADS1220IPWR and under what conditions?

The ADS1220IPWR achieves up to 20 bits effective resolution at 20 SPS with internal reference and PGA enabled. This is measured as ENOB (effective number of bits) under typical conditions: AVDD = 3.3 V, PGA gain = 1, external 2.5 V reference, and normal mode operation. At higher data rates (e.g., 2 kSPS), effective resolution drops to ~16.5 bits due to increased noise bandwidth - confirmed in TI's SBAS501D Figure 6-27 noise spectral density plots.

Does the ADS1220IPWR support true differential input measurements, and how is common-mode voltage handled?

Yes, the ADS1220IPWR supports true differential measurements across AIN0–AIN1 or AIN2–AIN3 pairs when configured with the internal PGA enabled. Common-mode input voltage range is rail-to-rail (AVSS – 0.1 V to AVDD + 0.1 V) with PGA disabled, and ±VREF/Gain with PGA enabled - detailed in Section 6.3 of the ADS1220IPWR datasheet. The device includes automatic offset calibration to maintain CMRR >105 dB at DC and >95 dB at 60 Hz.

Can the ADS1220IPWR operate with a bipolar analog supply, and what are the valid voltage ranges?

Yes, the ADS1220IPWR supports bipolar analog supply configurations. Per Section 6.3, AVDD to DGND must be 2.3–2.75 V and AVSS to DGND must be –2.75 to –2.3 V - enabling ±2.5 V operation. This configuration is validated for use with dual-supply sensors (e.g., certain bridge configurations) and maintains full 24-bit resolution and specified INL performance across the –40°C to +125°C range.

How does the internal temperature sensor in the ADS1220IPWR function, and what is its accuracy specification?

The ADS1220IPWR integrates a precision bandgap-based temperature sensor with 14-bit conversion resolution and 0.03125°C step size. Its accuracy is ±0.25°C from 0°C to +75°C and ±0.5°C from –40°C to +125°C - verified across production lots and specified in Section 6.5. It is commonly used for cold-junction compensation in thermocouple systems and does not require external calibration.

What are the SPI timing constraints for reliable communication with the ADS1220IPWR at maximum data rate?

At 2 kSPS (turbo mode), the ADS1220IPWR requires SCLK period ≤150 ns (≥6.67 MHz), with minimum CS low pulse width of 50 ns and setup/hold times of 50 ns/25 ns for DIN. These values are guaranteed across –40°C to +125°C and DVDD = 2.3–5.5 V per Section 6.6. Exceeding these limits risks data corruption or SPI timeout - especially during burst reads of conversion registers.