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Texas Instruments ADS1278HPAP
- Part No.:
- ADS1278HPAP
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-PowerTQFP
- Datasheet:
-
ADS1278HPAP.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 64HTQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,954
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Product details
Overview
ADS1278HPAP from Texas Instruments is an 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 +175°C. It supports eight differential analog inputs, linear-phase digital filtering, and SPI/frame-sync serial interface - designed for high-precision, high-temperature down-hole drilling and vibration analysis systems.
For engineers reviewing the ADS1278HPAP datasheet, ADS1278HPAP pinout, ADS1278HPAP application, or ADS1278HPAP equivalent, key selection considerations include its simultaneous eight-channel sampling capability, ultra-low 0.8-μV/°C offset drift, selectable operating modes (high-speed/high-resolution/low-power/low-speed), and HTQFP-64 PowerPAD™ package rated for extreme temperature environments.
Technical Context
The ADS1278HPAP employs a high-order chopper-stabilized modulator achieving low in-band noise and minimal drift, paired with an onboard decimation filter that delivers ≤0.005 dB passband ripple and usable bandwidth up to 90% of Nyquist. Its digital filter architecture supports linear-phase response and configurable stopband attenuation (≥95 dB).
All four 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) - are controlled directly by MODE[1:0] pins; no register programming is required. The device offers modulator output bypass and TDM/discrete data output options via FORMAT[2:0].
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full dynamic range utilization in precision measurement. |
| Data Rate | Up to 128 kSPS (High-Speed mode) - enables real-time capture of fast transients across all eight channels simultaneously. |
| SNR | 111 dB (High-Resolution mode, 52 kSPS) - supports >20-bit effective resolution for low-noise sensor interfaces like strain gauges. |
| Offset Drift | 0.8 μV/°C - ensures stable DC accuracy over wide temperature excursions without recalibration. |
| Gain Drift | 1.3 ppm/°C - maintains gain stability critical for multi-decade dynamic range applications such as pressure sensing. |
| Input Impedance | 14 kΩ (High-Speed/High-Resolution modes) - simplifies anti-aliasing filter design and reduces loading on signal sources. |
| Operating Temp | –55°C to +175°C - validated for extended industrial and down-hole environments where standard ADCs fail. |
Pinout & Package
The ADS1278HPAP is housed in a 64-pin HTQFP PowerPAD™ package (PAP) with exposed thermal pad for enhanced heat dissipation in high-temperature PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP1–AINP8 / AINN1–AINN8 | Differential analog inputs (8 channels) | Accept true differential signals with common-mode voltage fixed at AVDD/2; enable rejection of noise common to both conductors. |
| VREFP / VREFN | Reference voltage inputs | Define full-scale range (±VREF); support external reference up to 3.1 V with 0.65-kΩ input impedance in high-speed mode. |
| MODE0 / MODE1 | Operating mode select | Hardware-configurable pin control (no registers) for instant switching between high-speed, high-resolution, low-power, or low-speed modes. |
| DOUT1–DOUT8 | Channel data outputs | Provide simultaneous TDM or discrete parallel outputs - eliminates inter-channel timing skew in synchronized acquisition. |
| DRDY/FSYNC | Data-ready / frame-sync input | Configurable dual-function pin: asserts DRDY after conversion completion (SPI) or accepts external sync clock (frame-sync protocol). |
| PWDN1–PWDN8 | Per-channel power-down control | Individually disable unused channels to reduce system power without affecting active channel performance or timing. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 8-channel sampling | Eliminates phase mismatch between channels - essential for coherent modal analysis and multi-sensor vibration monitoring. |
| Selectably optimized operating modes | Four hardware-selectable modes allow trade-off tuning of speed, resolution, and power per application need - no firmware overhead. |
| Linear-phase digital filter | Preserves time-domain integrity of transient signals; group delay is constant (38–39/fDATA seconds), enabling accurate time-of-flight measurements. |
| Modulator output option | Bypasses digital filter to access raw modulator bitstream - supports custom decimation or real-time spectral analysis in FPGA-based systems. |
| Low sampling aperture error | Minimizes timing uncertainty during sample-and-hold - critical for high-frequency AC performance up to 62-kHz bandwidth. |
Applications
| Down-Hole Drilling Monitoring | Vibration/Modal Analysis |
|---|---|
Use Scenario: Real-time acquisition of pressure, temperature, and directional sensor data inside oil/gas wellbores at >150°C ambient. IC Role / Device Role / Timing Role: Simultaneous-sampling ADC capturing eight geophysical sensor channels with sub-microvolt drift stability over thermal cycling. Use Value: Enables reliable formation evaluation without recalibration during extended down-hole deployments. | Use Scenario: Multi-point structural vibration measurement on turbine blades, aircraft fuselages, or rotating machinery. IC Role / Device Role / Timing Role: Precision digitizer providing phase-coherent samples across all channels for FFT-based frequency domain analysis. Use Value: Delivers 111-dB SNR and <0.005 dB passband ripple to resolve closely spaced resonant modes with high fidelity. |
| Multi-Channel Data Acquisition | Acoustics/Dynamic Strain Gauges |
Use Scenario: Compact, high-channel-count DAQ systems for test benches, environmental chambers, and field-deployable instrumentation. IC Role / Device Role / Timing Role: Core ADC engine supporting eight independent differential inputs with programmable data rates and SPI/frame-sync interface flexibility. Use Value: Reduces component count versus multiple single-channel ADCs while guaranteeing inter-channel synchronization and matched gain/offset specs. | Use Scenario: High-fidelity capture of acoustic emissions or dynamic strain responses in materials testing and non-destructive evaluation. IC Role / Device Role / Timing Role: Low-noise, high-linearity converter interfacing piezoelectric sensors and Wheatstone bridge configurations. Use Value: Achieves 5.5-μVrms noise floor in high-resolution mode - resolves micro-strain-level signals without amplification-induced distortion. |
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 |
|---|---|---|---|
| ADS1278SHFQ | 84-pin HFQ package rated for –55°C to +210°C; higher thermal performance (θJA = 21.8°C/W vs. 33.1°C/W). | Suitable for ultra-high-temperature environments beyond 175°C, e.g., jet engine monitoring. | Select when junction temperature exceeds 175°C or board-level thermal management is constrained. |
| ADS131M08IPBS | 24-bit, 8-channel, 64-kSPS delta-sigma ADC; lower max data rate, integrated PGA, and –40°C to +125°C rating. | Targeted at cost-sensitive industrial DAQ where extreme temperature operation is not required. | Choose for standard-temperature applications needing on-chip programmable gain and lower power consumption. |
Compared with ADS1278SHFQ and ADS131M08IPBS, the ADS1278HPAP uniquely balances extreme-temperature operation (–55°C to +175°C), 128-kSPS simultaneous sampling, and ultra-low drift - making it irreplaceable in down-hole and aerospace-grade systems where thermal robustness and timing coherence are non-negotiable.
Availability
ADS1278HPAP is available at Aetrix Electronics and suitable for down-hole drilling monitoring, vibration/modal analysis, and multi-channel data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS1278HPAP 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 company specializing in analog and embedded processing technologies, with leadership in high-reliability, high-performance data converters and industrial-grade ICs.
The ADS1278HPAP belongs to TI's high-temperature precision ADC product line, engineered specifically for demanding applications in oil & gas, aerospace, and industrial automation where conventional converters fail under thermal stress.
FAQ
What is the maximum operating temperature specification for the ADS1278HPAP?
The ADS1278HPAP is fully specified over –55°C to +175°C ambient temperature and packaged in an HTQFP-64 PowerPAD™ (PAP) variant optimized for thermal reliability in down-hole and engine-mounted applications. Its internal junction temperature is rated up to 217°C, but the PAP package limits operational ambient to +175°C per datasheet Section 6.1.
Does the ADS1278HPAP require configuration registers to select operating modes?
No, the ADS1278HPAP uses hardware pin control - MODE0 and MODE1 pins directly set High-Speed, High-Resolution, Low-Power, or Low-Speed mode without any register writes or SPI initialization sequence. This eliminates firmware dependencies and ensures deterministic startup behavior in safety-critical systems.
Can the ADS1278HPAP interface with an FPGA using frame-sync protocol instead of SPI?
Yes, the ADS1278HPAP supports both SPI and frame-sync protocols via FORMAT[2:0] pins. In frame-sync mode, DRDY/FSYNC functions as a frame clock input, and DOUT1–DOUT8 deliver synchronized parallel data - ideal for FPGA-based real-time processing with deterministic latency and no protocol overhead.
What is the significance of the VCOM pin on the ADS1278HPAP?
The VCOM pin provides an unbuffered AVDD/2 voltage output used as a common-mode reference for differential analog input drivers. It enables single-supply front-end designs with rail-to-rail input capability and reduces layout sensitivity to ground bounce in high-noise environments.
How does the ADS1278HPAP achieve simultaneous sampling across all eight channels?
The ADS1278HPAP integrates eight matched delta-sigma modulators and a shared decimation filter architecture with synchronized clock distribution. All channels sample at the exact same instant upon SYNC pulse assertion - eliminating inter-channel skew and preserving phase relationships critical for coherent signal analysis.
ADS1278HPAP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-PowerTQFP
- 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 ~ 175°C
- Supplier Device Package:
- 64-HTQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1278HPAP FAQ
1.How can I place an order for ADS1278HPAP through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1278HPAP 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 ADS1278HPAP reliable?
The price and inventory of ADS1278HPAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1278HPAP is usually 5 days.
3.What payment methods are accepted for ADS1278HPAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1278HPAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1278HPAP?
ADS1278HPAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1278HPAP 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 ADS1278HPAP?
For technical support, including ADS1278HPAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1278HPAP requirements.
6.How does Aetrix verify that ADS1278HPAP is sourced from the original manufacturer or authorized distributors?
All ADS1278HPAP 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 ADS1278HPAP meets industry standards.
7.What is the process for return or replacement of ADS1278HPAP?
All ADS1278HPAP units undergo pre-shipment inspection (PSI). If there is an issue with ADS1278HPAP, 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 ADS1278HPAP part is unused and in its original packaging.
Return procedure for ADS1278HPAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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