Texas Instruments ADS1259BIPWR

Overview

ADS1259BIPWR from Texas Instruments is a 24-bit, delta-sigma analog-to-digital converter with integrated 2.5V low-drift reference, programmable digital filter (sinc1/sinc2), 10SPS–14.4kSPS output data rates, ±0.4ppm INL, and 0.05μV/°C offset drift. It operates from ±2.5V analog supplies or +5V single supply and targets high-accuracy industrial process control signal chains.

For engineers reviewing the ADS1259BIPWR datasheet, ADS1259BIPWR pinout, ADS1259BIPWR application, or ADS1259BIPWR equivalent, key selection considerations include its single-cycle settling mode, simultaneous 50/60Hz rejection at 10SPS, out-of-range detection flagging, SPI-compatible interface with checksum validation, and internal oscillator supporting crystal or external clock inputs.

Technical Context

The ADS1259BIPWR employs a fourth-order, inherently stable ΔΣ modulator with 2+2 pipelined architecture, delivering 24-bit no-missing-codes resolution and 23.4 ENOB at 60SPS. Its digital filter comprises a fifth-order sinc stage followed by selectable sinc1 (single-cycle settling) or sinc2 (enhanced noise filtering) averaging.

It integrates a low-noise, low-drift 2.5V reference (2ppm/°C drift, ±0.4% accuracy at +25°C), an internal LDO powering the digital core from DVDD, and a fast out-of-range detector that flags conversions when AINP–AINN exceeds ±105% of FSR. Clocking supports internal oscillator (±0.2% accuracy), external crystal (0.1–8MHz), or external CLKIN.

Key Specifications

Pinout & Package

TSSOP-20 package (PW suffix), 4.4mm × 6.5mm body, 0.65mm pitch, exposed pad optional for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1256IPWR and AD7195BRUZ, the ADS1259BIPWR uniquely combines integrated 2.5V reference (2ppm/°C), single-cycle settling, and simultaneous 50/60Hz rejection-making it optimal for compact, self-contained, ultra-stable measurement nodes where board space and calibration overhead are critical constraints.

Availability

ADS1259BIPWR is available at Aetrix Electronics and suitable for industrial process control, scientific instrumentation, test and measurement equipment, and high-accuracy data loggers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ADS1259BIPWR 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, embedded processing, and high-reliability components for industrial, automotive, and communications markets.

The ADS1259BIPWR belongs to TI's precision delta-sigma ADC product line, engineered specifically for applications demanding ultra-low drift, high linearity, and integrated reference stability in harsh industrial environments.

FAQ

What is the maximum sample rate supported by the ADS1259BIPWR?

The ADS1259BIPWR supports output data rates from 10 samples per second (SPS) up to 14,400 SPS. At the maximum rate of 14.4kSPS, the device achieves 19.6 effective number of bits (ENOB) and 6.2μVRMS noise in sinc1 mode. The data rate is fully programmable via SPI register configuration and applies identically whether using the internal oscillator, external crystal, or external clock source.

Does the ADS1259BIPWR require an external reference voltage?

No, the ADS1259BIPWR does not require an external reference voltage because it integrates a precision 2.5V low-drift reference with 2ppm/°C temperature coefficient and ±0.4% initial accuracy. However, it supports external reference operation via VREFP/VREFN pins if system-level calibration or alternative reference voltages (e.g., 3.0V or 4.096V) are required. When using the internal reference, REFOUT provides a buffered 2.5V output capable of sourcing/sinking ±10mA.

How does the out-of-range detection feature work on the ADS1259BIPWR?

The ADS1259BIPWR features a dedicated out-of-range detector that flags conversions when the differential input (AINP – AINN) exceeds ±105% of full-scale range (FSR). The result is latched and reported either as the LSB of the conversion data word or as bit 7 of the checksum byte. The latch resets automatically upon reading the conversion data or initiating a new conversion. This real-time fault indication enables immediate system response to sensor overvoltage or wiring faults without requiring host-side computation.

Can the ADS1259BIPWR operate from a single +5V analog supply?

Yes, the ADS1259BIPWR supports single-supply analog operation with AVDD = +5V and AVSS = DGND (0V), enabling unipolar input ranges from 0V to +5V (or offset-bipolar configurations). It also supports true bipolar operation with AVDD = +2.5V and AVSS = –2.5V for ±2.5V differential input ranges. The digital supply DVDD operates independently from 2.7V to 5.25V, allowing mixed-voltage system integration. All specifications-including INL, noise, and drift-are guaranteed across both configurations.

What clock sources are supported by the ADS1259BIPWR?

The ADS1259BIPWR supports three clock sources: (1) internal oscillator (7.3728MHz nominal, ±0.2% accuracy), (2) external crystal (0.1–8MHz, requires 18pF load capacitors on XTAL1/XTAL2), and (3) external CMOS clock applied to XTAL1/CLKIN pin (0.1–8MHz, 40–60% duty cycle). The SYNCOUT pin provides a divided-by-8 clock (fCLK/8) useful for synchronizing external devices like the PGA280. Startup time is 20ms for crystal mode and instantaneous for internal/external clock modes.