Texas Instruments ADS1626IPAPT

Overview

ADS1626IPAPT from Texas Instruments is an 18-bit, 1.25MSPS delta-sigma analog-to-digital converter (ADC) with on-chip FIFO, ±0.0025dB passband ripple, 93dB SNR, and −101dB THD. It operates from +5V analog and +3V digital supplies, supports direct TMS320C6000 DSP interfacing, and targets high-fidelity data acquisition in vibration analysis and medical imaging systems.

For engineers reviewing the ADS1626IPAPT datasheet, ADS1626IPAPT pinout, ADS1626IPAPT application, or ADS1626IPAPT equivalent, key selection criteria include its 615kHz linear-phase bandwidth, adjustable power dissipation (150–515mW), FIFO_LEV[2:0] programmable output buffer, selectable internal/external reference, and TQFP-64 PowerPAD™ package compatibility with industrial temperature range (−40°C to +85°C).

Technical Context

The ADS1626IPAPT employs a stable 2-1-1 pipelined delta-sigma modulator sampling at 40MSPS (fCLK = 40MHz), decimated by a low-ripple linear-phase digital filter to deliver 1.25MSPS output with 615kHz −3dB bandwidth. Its differential input architecture measures (AINP − AINN) against (VREFP − VREFN), supporting full-scale input of ±1.467VREF.

It integrates configurable bias control via RBIAS resistor, out-of-range detection (OTR), asynchronous reset (RESET), and power-down (PD) functionality. The FIFO buffer-exclusive to ADS1626-is controlled by three dedicated input pins (FIFO_LEV[2:0]) and enables flexible data buffering for burst-mode acquisition without host timing constraints.

Key Specifications

Pinout & Package

The ADS1626IPAPT is housed in a thermally enhanced HTQFP-64 (PAP) package with PowerPAD™ exposed thermal pad, optimized for high-power ADC operation and PCB heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1625IPAPT, the ADS1626IPAPT adds FIFO-based data flow control at identical precision and power; versus AD7641ASTZ, it trades raw speed for superior noise performance, integrated filtering, and deterministic linear-phase response-making it optimal for spectral integrity-critical applications.

Availability

ADS1626IPAPT is available at Aetrix Electronics and suitable for scientific instrumentation, automated test equipment, and medical imaging systems requiring stable component supply, long-term production continuity, and guaranteed traceability.

Supply support for ADS1626IPAPT 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 leadership in precision data converters.

The ADS1626IPAPT belongs to TI's high-performance delta-sigma ADC family, designed specifically for demanding measurement applications where spectral purity, wide dynamic range, and linear-phase fidelity are non-negotiable.

FAQ

What is the maximum clock frequency supported by the ADS1626IPAPT?

The ADS1626IPAPT supports a clock input (CLK) frequency range of 1MHz to 50MHz, with typical operation at 40MHz. At fCLK = 40MHz, the device achieves its rated 1.25MSPS output data rate and specified dynamic performance (93dB SNR, −101dB THD). Exceeding 50MHz violates absolute maximum ratings and may cause functional failure.

Does the ADS1626IPAPT require an external reference voltage?

No-the ADS1626IPAPT includes a selectable on-chip 3.0V reference with 50ppm/°C drift, enabled by pulling REFEN low. Alternatively, an external 2.5–3.2V reference can be applied to VREFP/VREFN. The ADS1626IPAPT's flexibility eliminates mandatory external reference components unless higher accuracy or lower drift is required.

How does the FIFO function in the ADS1626IPAPT differ from standard buffer implementations?

The ADS1626IPAPT's FIFO is hardware-configured via FIFO_LEV[2:0] pins (not software-programmed), offering fixed depths of 1–8 words. Unlike ring buffers, it operates synchronously with DRDY and supports burst reads without host timing negotiation-enabling reliable capture of transient events even under variable processor load. This differs fundamentally from SRAM-based FIFOs requiring address management.

What is the purpose of the RBIAS pin on the ADS1626IPAPT?

The RBIAS pin on the ADS1626IPAPT connects to an external resistor that sets the analog bias current, directly controlling AVDD supply current and total power dissipation (150–515mW). A 37kΩ resistor yields typical 135mA IAVDD at 40MHz; increasing resistance reduces current and power-allowing thermal optimization for lower data rates without sacrificing ADC performance.

Can the ADS1626IPAPT interface directly with 5V logic systems?

Yes-the ADS1626IPAPT supports IOVDD from +2.7V to +5.25V, enabling direct connection to 5V TTL or CMOS logic without level-shifting circuitry. When IOVDD = 5V, VIH ≥ 3.5V and VOL ≤ 1.0V meet standard 5V logic thresholds. However, DVDD must remain at +3V, and all timing parameters (e.g., t7, t8) scale accordingly per the datasheet's IOVDD-dependent specifications.