Texas Instruments ADS1262IPW

Overview

ADS1262IPW from Texas Instruments is a 32-bit, delta-sigma analog-to-digital converter with integrated programmable gain amplifier (PGA), 2.5-V internal voltage reference, dual sensor excitation current sources, and 11 multifunction analog inputs. It delivers 7 nV_RMS noise at 2.5 SPS (gain = 32), 0.5 ppm/°C gain drift, and 130-dB 50/60-Hz rejection-enabling high-accuracy weigh scale and RTD-based temperature measurement systems.

For engineers reviewing the ADS1262IPW datasheet, ADS1262IPW pinout, ADS1262IPW application, or ADS1262IPW equivalent, key selection criteria include its single-cycle settled digital filter, on-chip fault monitoring, ±105% FSR over-range detection, and operation across –40°C to +125°C without external calibration components.

Technical Context

The ADS1262IPW integrates a low-noise CMOS PGA (gains 1–32), a ΔΣ modulator, and a programmable digital filter optimized for single-cycle settling at up to 38.4 kSPS. Its analog front-end includes two matched, programmable current sources (50–3000 μA) for direct 2-/3-/4-wire RTD excitation and biasing of bridge sensors.

It features an internal 7.3728-MHz oscillator, configurable serial interface (SPI-compatible), and eight GPIOs usable as digital I/O or auxiliary functions (e.g., TDAC outputs). The device supports both internal 2.5-V reference (2 ppm/°C drift) and external reference inputs, with dedicated REFP/N pins per channel group.

Key Specifications

Pinout & Package

The ADS1262IPW is housed in a 28-pin TSSOP package (9.70 mm × 4.40 mm), rated for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1263IPW, the ADS1262IPW removes redundant ADC hardware to reduce cost and power while retaining identical 32-bit precision, PGA, IDACs, and fault monitoring-making it optimal for cost-sensitive, single-path sensor systems. Versus AD7177-2BRUZ, ADS1262IPW integrates signal conditioning resources that eliminate four to six external components in RTD/strain-gauge designs.

Availability

ADS1262IPW is available at Aetrix Electronics and suitable for factory automation, process instrumentation, and industrial temperature control applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS1262IPW 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 acquisition and industrial signal chain solutions.

The ADS126x product line was designed specifically for high-accuracy, sensor-ready measurement systems-including weigh scales, strain gauges, thermocouples, and RTDs-where low drift, integrated excitation, and robust fault detection are mandatory.

FAQ

What is the maximum achievable effective resolution of the ADS1262IPW at 2.5 SPS?

The ADS1262IPW achieves 7 nV_RMS noise at 2.5 SPS with PGA gain = 32, corresponding to ~24.5 ENOB (effective number of bits). With full-scale input range of ±78 mV (per datasheet Figure D017), this yields sub-microvolt effective resolution-enabling 100,000+ count weigh scale systems without external amplification. This performance is confirmed in SBAS661C Figure D017 and Section 7.5.

Does the ADS1262IPW support 4-wire RTD measurement without external components?

Yes-the ADS1262IPW integrates two matched, programmable current sources (IDAC1/IDAC2) with 50–3000 μA range and ±0.7% absolute accuracy. When configured on AIN0–AIN7 pins, these IDACs directly excite 4-wire RTDs while using AINCOM as the sense return, eliminating external current sources, op-amps, or routing complexity. This capability is documented in Sections 1, 3, and 7.5 of SBAS661C.

Can the ADS1262IPW operate with an external reference instead of the internal 2.5-V reference?

Yes-the ADS1262IPW supports both internal and external reference configurations. External references can be applied differentially across REFP1/REFN1, REFP2/REFN2, or REFP3/REFN3 pins, with input current ≤150 nA and impedance ≥50 MΩ. The internal 2.5-V reference remains available as REFOUT for biasing external circuitry. Details are in Sections 7.3, 7.5, and Figure 9-10 of SBAS661C.

What fault conditions does the ADS1262IPW monitor internally?

The ADS1262IPW includes hardware-monitored fault detection for open/shorted sensor leads, reference voltage loss, PGA overrange (±105% FSR), AVDD/AVSS undervoltage, and temperature sensor anomalies. These are reported via ALARM pin and status registers-enabling autonomous system diagnostics without host MCU polling. Full fault mapping is defined in Sections 1, 9.3.13, and Table 9-2 of SBAS661C.

Is the ADS1262IPW pin-compatible with the ADS1263IPW?

Yes-the ADS1262IPW and ADS1263IPW share identical 28-pin TSSOP packaging, pin assignments, electrical characteristics, and register maps. The ADS1263IPW adds a second 24-bit ADC channel but maintains full functional and pin compatibility, allowing drop-in replacement where auxiliary measurement capability is later required. This is explicitly stated in Section 3 and Table 5 of SBAS661C.