Texas Instruments ADS1263IPWR

Overview

ADS1263IPWR from Texas Instruments is a 32-bit precision delta-sigma ADC with integrated PGA, dual 24-bit auxiliary ADC, 2.5-V internal reference, and dual sensor excitation current sources. 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 ADS1263IPWR datasheet, ADS1263IPWR pinout, ADS1263IPWR application, or ADS1263IPWR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts, and supply-ready availability details for industrial sensor signal chains.

Technical Context

The ADS1263IPWR integrates two independent ΔΣ modulators: a primary 32-bit ADC with programmable gain (1–32) and a secondary 24-bit auxiliary ADC for background monitoring. Its analog front-end includes dual 50–3000-μA excitation current sources with ±200-μA bias capability and a level-shift voltage generator referenced to (V_AVDD + V_AVSS)/2.

Digital filtering supports single-cycle settling at up to 38.4 kSPS, while internal fault monitors track over-range, reference loss, and PGA saturation. The device uses a 7.3728-MHz internal oscillator or external crystal/CLK input and communicates via SPI-compatible serial interface with DRDY/DOUT multiplexing.

Key Specifications

Pinout & Package

ADS1263IPWR is housed in a 28-pin TSSOP package (9.70 mm × 4.40 mm), specified from –40°C to +125°C, with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1262IPWR, the ADS1263IPWR adds concurrent auxiliary measurement capability without layout changes; versus AD7177-2BRUZ, it reduces bill-of-materials count by integrating PGA, reference, and excitation - simplifying Class III weighing and RTD designs.

Availability

ADS1263IPWR is available at Aetrix Electronics and suitable for factory automation modules, weigh scale OEM production, and industrial temperature controller designs requiring stable component supply and long-term lifecycle support.

Supply support for ADS1263IPWR 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 measurement applications - including weigh scales, strain gauges, thermocouples, and RTDs - where low drift, low noise, and integrated excitation are mandatory.

FAQ

What is the maximum achievable effective resolution of the ADS1263IPWR at 2.5 SPS?

The ADS1263IPWR achieves 7 nV_RMS noise at 2.5 SPS with PGA gain = 32, corresponding to 24.3 ENOB (effective number of bits). With its 32-bit output register and digital filtering, the ADS1263IPWR supports up to 25.5-bit effective resolution under optimal conditions - sufficient for 1:100,000+ dynamic range in precision weigh scale applications.

Does the ADS1263IPWR require an external crystal, or can it operate with its internal oscillator?

The ADS1263IPWR can operate using its internal 7.3728-MHz oscillator (±0.5% accuracy), eliminating the need for external crystals in cost-sensitive designs. XTAL1/CLKIN and XTAL2 pins are configured for internal oscillator mode by grounding XTAL1/CLKIN and leaving XTAL2 floating - verified in the ADS1263IPWR datasheet Section 6 and Table 7.5.

How does the auxiliary 24-bit ADC in the ADS1263IPWR function alongside the main ADC?

The auxiliary 24-bit ADC in the ADS1263IPWR operates independently of the main 32-bit ADC, sharing analog inputs but using separate modulators and filters. It is typically configured for background tasks - such as monitoring reference voltage drift, measuring on-die temperature, or scanning diagnostic channels - without interrupting primary conversion sequences in the ADS1263IPWR.

What is the purpose of the CAPP and CAPN pins on the ADS1263IPWR?

The CAPP and CAPN pins on the ADS1263IPWR provide the differential output of the integrated PGA. A 4.7-nF C0G capacitor must be placed between them to stabilize the PGA's internal feedback loop. This configuration enables high-impedance buffered analog output for external signal routing or secondary conditioning stages in the ADS1263IPWR signal chain.

Can the ADS1263IPWR drive a 4-wire RTD directly without external components?

Yes - the ADS1263IPWR integrates two matched excitation current sources (IDAC1/IDAC2) and eight GPIOs, enabling direct 4-wire RTD measurement. One IDAC excites the RTD, while the other sources current into a precision reference resistor for ratiometric conversion; AIN0–AIN3 configure differential sensing, and GPIOs control switching - all without external active components in the ADS1263IPWR.