Texas Instruments ADS1278SKGDA

Overview

ADS1278SKGDA from Texas Instruments is a high-temperature, octal simultaneous-sampling 24-bit delta-sigma analog-to-digital converter (ADC) with up to 128-kSPS data rate, 111-dB SNR in high-resolution mode, ±0.0003% FSR INL, and operation over –55°C to 210°C. It serves as the core precision acquisition engine in down-hole drilling instrumentation where eight synchronized channels capture dynamic strain, pressure, and vibration signals under extreme thermal stress.

For engineers reviewing the ADS1278SKGDA datasheet, ADS1278SKGDA pinout, ADS1278SKGDA application, or ADS1278SKGDA equivalent, this bare-die variant enables custom high-reliability packaging for aerospace, oil & gas, and nuclear-grade embedded systems requiring extended temperature operation, low drift (0.8 µV/°C offset drift), and deterministic latency (78/fDATA settling time).

Technical Context

The ADS1278SKGDA integrates a chopper-stabilized high-order modulator and an on-chip linear-phase digital decimation filter delivering ≤0.005 dB passband ripple and usable bandwidth up to 90% of Nyquist. Its four pin-controlled operating modes-High-Speed (128 kSPS), High-Resolution (52 kSPS, 111 dB SNR), Low-Power (52 kSPS, 31 mW/ch), and Low-Speed (10 kSPS, 7 mW/ch)-eliminate register programming and support real-time trade-offs between throughput, noise, and power.

It supports both SPI and Frame-Sync serial interfaces with TDM/discrete output options, offers modulator output bypass for external filtering, and features independent per-channel power-down control (PWDN[8:1]) and synchronous sampling via SYNC input. Analog inputs accept ±VREF differential ranges with 14–140 kΩ configurable input impedance depending on mode.

Key Specifications

Pinout & Package

ADS1278SKGDA is supplied as a bare die in chiptray format, with 84 bond pads on a 15-mil-thick silicon substrate. Backside metallization is AlCu, grounded, and compatible with standard die-attach processes. Die dimensions and pad coordinates are defined in Table 4 of SBAS447E Rev E.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1278SKGDA, the ADS1278SHFQ provides standardized assembly but larger footprint and lower thermal conductivity, while ADS1278SHKP adds hermetic sealing and screening at higher cost-both retain identical electrical specs and pinout mapping but differ in mechanical integration path and qualification scope.

Availability

ADS1278SKGDA is available at Aetrix Electronics and suitable for down-hole drilling instrumentation, high-temperature pressure sensing, and acoustic emission monitoring requiring stable component supply across extended temperature lifecycles and controlled-baseline manufacturing.

Supply support for ADS1278SKGDA 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 high-reliability, high-temperature IC design for industrial and aerospace markets.

The ADS1278 product line was engineered specifically for extreme-environment data acquisition, combining industrial-grade DC precision with audio-class AC performance to serve oilfield, aviation, and nuclear instrumentation where conventional ADCs fail.

FAQ

What is the maximum operating temperature of the ADS1278SKGDA?

The ADS1278SKGDA is fully specified and production-tested over –55°C to 210°C. Its bare-die construction, AlCu metallization, and controlled-baseline process enable reliable operation at 210°C junction temperature in properly designed hermetic packages with validated thermal interface materials.

Does the ADS1278SKGDA require configuration registers to operate?

No. The ADS1278SKGDA uses pin-strapped mode selection (MODE[1:0]) and interface control (FORMAT[2:0]), eliminating register writes. All four operating modes-High-Speed, High-Resolution, Low-Power, and Low-Speed-are set at power-up via hardwired logic levels, ensuring deterministic behavior in safety-critical systems.

How many analog input channels does the ADS1278SKGDA support?

The ADS1278SKGDA supports eight fully differential analog input channels (AINP[8:1]/AINN[8:1]), each with independent power-down control (PWDN[8:1]). All channels sample simultaneously with sub-nanosecond aperture matching, enabling coherent multi-sensor acquisition without time-interleaving artifacts.

What reference voltage range is supported by the ADS1278SKGDA?

The ADS1278SKGDA accepts a reference voltage span (VREF = VREFP – VREFN) from 0.5 V to 3.1 V at 27 MHz clock, or up to 2.6 V at 32.768 MHz. Input impedance varies by mode (0.65–6.5 kΩ), allowing direct connection to precision external references like REF5025 without buffer amplifiers.

Can the ADS1278SKGDA be used with SPI or Frame-Sync interfaces?

Yes. The ADS1278SKGDA supports both protocols via FORMAT[2:0] pin configuration. In SPI mode, DRDY functions as data-ready output; in Frame-Sync mode, it serves as frame clock input. DOUT[8:1] provide discrete channel outputs, while TDM mode consolidates data onto a single serial line.