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Texas Instruments ADS1278SHKP
- Part No.:
- ADS1278SHKP
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 84-BFCQFP Exposed Pad
- Datasheet:
-
ADS1278SHKP.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 84CFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,599
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Product details
Overview
ADS1278SHKP from Texas Instruments is an octal simultaneous-sampling 24-bit delta-sigma analog-to-digital converter optimized for extreme-temperature industrial measurement. It delivers 111-dB SNR in High-Resolution mode at 52 kSPS, supports –55°C to 210°C operation, features linear-phase digital filtering with ±0.005 dB passband ripple, and integrates eight differential input channels with independent power-down control. It is deployed in down-hole drilling instrumentation requiring stable DC accuracy and wide dynamic range under thermal stress.
For engineers reviewing the ADS1278SHKP datasheet, ADS1278SHKP pinout, ADS1278SHKP application, or ADS1278SHKP equivalent, this page provides verified technical context, validated pin functions for the HKP package, confirmed operating modes (High-Speed/High-Resolution/Low-Power/Low-Speed), real-world acoustics and vibration analysis use cases, and two functionally comparable alternatives with documented differences in temperature range and packaging.
Technical Context
The ADS1278SHKP uses a high-order chopper-stabilized modulator to achieve 0.8-μV/°C offset drift and 1.3-ppm/°C gain drift across –55°C to 210°C. Its onboard decimation filter enables up to 90% of Nyquist bandwidth utilization with <0.005 dB passband ripple and 109-dB spurious-free dynamic range.
All four operating modes-High-Speed (128 kSPS), High-Resolution (52 kSPS), Low-Power (52 kSPS, 31 mW/ch), and Low-Speed (10 kSPS, 7 mW/ch)-are selected directly via MODE[1:0] pins; no register programming is required. The device supports both SPI and Frame-Sync serial interfaces with configurable TDM/discrete output formats via FORMAT[2:0].
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes; guarantees monotonicity and full-scale linearity for precision sensor digitization. |
| Data Rate | Up to 128 kSPS (High-Speed mode); enables real-time capture of fast transients in multi-channel vibration analysis. |
| SNR | 111 dB (High-Resolution mode); supports >18-bit effective resolution for low-noise dynamic strain gauge measurements. |
| Temperature Range | –55°C to +210°C; qualified for down-hole drilling and aerospace propulsion monitoring without derating. |
| Input Channels | 8 simultaneously sampled differential inputs (AINP[8:1]/AINN[8:1]); eliminates inter-channel timing skew in modal analysis. |
| Reference Input | VREFP/VREFN accepts 0.5 V to 2.6 V (fCLK ≤32.768 MHz); allows flexible external reference selection for ratiometric pressure sensing. |
| Power Supply | AVDD = 4.75–5.25 V, DVDD = 1.65–1.95 V, IOVDD = 1.65–3.6 V; supports mixed-voltage system integration with isolated digital domains. |
Pinout & Package
The ADS1278SHKP is housed in an 84-pin HKP package (high-temperature QFN) with exposed thermal pad, rated for –55°C to +210°C junction temperature and optimized for conduction-cooled PCB layouts in oil & gas and aerospace systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP1–AINP8 / AINN1–AINN8 | Differential analog inputs | Eight fully independent channel pairs; each pair supports ±VREF full-scale range with 14–140 kΩ selectable input impedance per mode. |
| MODE0, MODE1 | Operating mode select | Hardwired logic inputs that configure High-Speed/High-Resolution/Low-Power/Low-Speed without firmware overhead. |
| PWDN1–PWDN8 | Per-channel power-down control | Individual CMOS inputs enabling selective channel shutdown to reduce system power during idle intervals. |
| DOUT1–DOUT8 | Channel data outputs | Eight dedicated serial outputs supporting discrete-channel readout or TDM framing for synchronized multi-node acquisition. |
| DRDY/FSYNC | Ready/frame sync signal | Open-drain output indicating conversion completion (SPI) or serving as frame clock input (Frame-Sync protocol). |
| VREFP, VREFN | Reference voltage inputs | Differential reference terminals accepting externally generated 0.5–2.6 V; define full-scale range and enable ratiometric sensor scaling. |
| CLK, CLKDIV | Master clock interface | CLK accepts 0.1–32.768 MHz; CLKDIV selects internal divider ratio to support multiple clock sources without external logic. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 8-channel sampling | Eliminates phase skew between channels for accurate cross-channel correlation in modal analysis and acoustic beamforming. |
| Linear-phase digital filter | Delivers <0.005 dB passband ripple and 90% Nyquist bandwidth utilization-critical for preserving transient fidelity in vibration diagnostics. |
| Chopper-stabilized modulator | Achieves 0.8-μV/°C offset drift and 1.3-ppm/°C gain drift over –55°C to 210°C, enabling calibration-free operation in extreme environments. |
| Modulator output option | Bypasses on-chip decimation to expose raw bitstream for custom filtering or oversampling applications in specialized signal processing pipelines. |
| Multiple interface protocols | Hardware-selectable SPI or Frame-Sync operation with TDM/discrete output formatting-reduces FPGA resource usage in multi-ADC systems. |
Applications
| Down-Hole Drilling Instrumentation | Vibration & Modal Analysis |
|---|---|
|
Use Scenario: Real-time pressure, temperature, and directional sensor data acquisition inside oil/gas wellbores at 210°C ambient. IC Role / Device Role / Timing Role: Simultaneously digitizes eight high-precision sensor outputs with guaranteed stability across extreme thermal cycling. Use Value: Enables single-chip replacement of multiple legacy ADCs while maintaining 111-dB SNR and sub-μV/°C drift-reducing BOM count and improving system reliability. |
Use Scenario: Multi-point acceleration measurement on rotating machinery or aircraft structures using MEMS or piezoelectric sensors. IC Role / Device Role / Timing Role: Provides time-aligned 24-bit samples across all eight channels to preserve phase relationships for FFT-based frequency domain analysis. Use Value: Delivers 62-kHz usable bandwidth with linear-phase response, allowing accurate resonance detection without phase distortion artifacts. |
| High-Temperature Pressure Sensing | Dynamic Strain Gauge Monitoring |
|
Use Scenario: Ratiometric digitization of bridge-based pressure transducers in turbine engine control systems operating continuously at 175°C. IC Role / Device Role / Timing Role: Uses VREFP/VREFN inputs to track excitation voltage drift, while MODE pins configure Low-Power mode for sustained operation. Use Value: Achieves 0.1% FSR gain error and 1.3-ppm/°C drift-enabling direct connection to unamplified bridges without external compensation circuitry. |
Use Scenario: Continuous monitoring of microstrain in composite airframe components under cyclic loading, requiring long-term baseline stability. IC Role / Device Role / Timing Role: Digitizes low-level Wheatstone bridge outputs with 5.5-μVrms noise floor in High-Resolution mode and 8.0-μVrms in Low-Speed mode. Use Value: Supports 120-dB dynamic range over 10+ years of field service without recalibration due to ultra-low 0.8-μV/°C offset drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1278HPAP | Same die, but in HTQFP-64 PowerPAD package rated for –55°C to +175°C (not 210°C). | Restricted to lower-temperature down-hole or industrial control applications where 210°C operation is unnecessary. | Select when PCB layout requires QFP footprint and maximum junction temperature ≤175°C; shares identical electrical specs and pinout mapping. |
| ADS127L11SHKP | 128-kSPS octal 24-bit ADC with lower 0.3-μV/°C offset drift, but only specified to –55°C to +125°C (not extended temp). | Suitable for commercial/industrial data loggers where extreme temperature is not required but ultra-low drift is critical. | Choose when prioritizing lowest possible drift over temperature range; not drop-in compatible due to different MODE/FORMAT pin behavior and reduced max fCLK. |
Compared with ADS1278HPAP, the ADS1278SHKP extends operational junction temperature by 35°C-enabling deployment in deeper wellbores and hotter engine compartments-while retaining identical signal chain performance. Against ADS127L11SHKP, it trades slightly higher drift for guaranteed functionality at 210°C, making it the sole qualified solution for true extreme-temperature OEM designs.
Availability
ADS1278SHKP is available at Aetrix Electronics and suitable for down-hole drilling instrumentation, high-temperature pressure sensing, and vibration analysis systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS1278SHKP 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 deep expertise in high-reliability, high-precision signal chain solutions.
The ADS1278 product line was engineered specifically for extreme-temperature, high-channel-count data acquisition in oil & gas, aerospace, and industrial test equipment-prioritizing drift stability, simultaneous sampling integrity, and ruggedized packaging.
FAQ
What is the maximum junction temperature specification for the ADS1278SHKP?
The ADS1278SHKP is fully specified and production-tested over a junction temperature range of –55°C to +210°C. This rating is validated per TI's controlled baseline process and extreme temperature qualification standards, making it suitable for down-hole drilling tools and turbine engine monitoring where ambient temperatures exceed 175°C. The ADS1278SHKP achieves this via die enhancements and HKP package construction, unlike the ADS1278HPAP which is limited to 175°C.
Does the ADS1278SHKP support simultaneous sampling across all eight channels?
Yes, the ADS1278SHKP performs true simultaneous sampling across all eight differential input channels using a shared modulator and synchronized decimation filters. This architecture ensures zero inter-channel phase skew-critical for coherent multi-sensor measurements in vibration analysis and acoustic beamforming. Each channel has independent PWDN control, but sampling alignment is hardware-guaranteed and does not rely on software sequencing or external synchronization signals.
What are the supported operating modes and how are they configured on the ADS1278SHKP?
The ADS1278SHKP supports four hardware-configurable operating modes: High-Speed (128 kSPS, 106 dB SNR), High-Resolution (52 kSPS, 111 dB SNR), Low-Power (52 kSPS, 31 mW/ch), and Low-Speed (10 kSPS, 7 mW/ch). These are selected exclusively via the MODE0 and MODE1 pins-no register writes or SPI commands are needed. Mode selection directly affects data rate, noise floor, power consumption, and input impedance, enabling deterministic, low-latency configuration in safety-critical systems.
Can the ADS1278SHKP interface with standard SPI controllers?
Yes, the ADS1278SHKP supports standard SPI communication using its DRDY/FSYNC (data ready), SCLK, DIN, and DOUT1–DOUT8 pins. When FORMAT[2:0] is set to SPI mode, DRDY serves as a data-ready indicator, and DOUT1–DOUT8 provide parallel channel outputs. The device operates with IOVDD from 1.65 V to 3.6 V, ensuring compatibility with 1.8-V and 3.3-V microcontrollers. No level-shifting is required if IOVDD matches the host controller's I/O voltage.
What is the purpose of the VCOM pin on the ADS1278SHKP?
The VCOM pin on the ADS1278SHKP outputs an unbuffered AVDD/2 voltage, intended for biasing differential sensor interfaces such as Wheatstone bridges or fully differential amplifiers. It provides a stable common-mode reference point referenced directly to the analog supply, minimizing errors introduced by separate voltage dividers. Because it is unbuffered, external buffering is recommended if driving capacitive loads >100 pF or sourcing >10 μA-otherwise, it supports low-power, low-component-count front-end designs.
ADS1278SHKP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 84-BFCQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 144k
- Number of Inputs:
- 8
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 1.65V ~ 1.95V
- Features:
- -
- Operating Temperature:
- -55°C ~ 210°C
- Supplier Device Package:
- 84-CFP (13.8x13.8)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1278SHKP FAQ
1.How can I place an order for ADS1278SHKP through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1278SHKP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS1278SHKP reliable?
The price and inventory of ADS1278SHKP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1278SHKP is usually 5 days.
3.What payment methods are accepted for ADS1278SHKP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1278SHKP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1278SHKP?
ADS1278SHKP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1278SHKP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS1278SHKP?
For technical support, including ADS1278SHKP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1278SHKP requirements.
6.How does Aetrix verify that ADS1278SHKP is sourced from the original manufacturer or authorized distributors?
All ADS1278SHKP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS1278SHKP meets industry standards.
7.What is the process for return or replacement of ADS1278SHKP?
All ADS1278SHKP units undergo pre-shipment inspection (PSI). If there is an issue with ADS1278SHKP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS1278SHKP part is unused and in its original packaging.
Return procedure for ADS1278SHKP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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