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Texas Instruments ADS8678IDBTR
- Part No.:
- ADS8678IDBTR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8678IDBTR.pdf
- Description:
- IC ADC 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,967
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Product details
Overview
ADS8678IDBTR from Texas Instruments is an 8-channel, 14-bit, 500-kSPS SAR ADC with integrated analog front-end, ±20-V input overvoltage protection, 1-MΩ constant resistive input impedance, and software-programmable bipolar/unipolar input ranges up to ±10.24 V - deployed in industrial PLC analog input modules for high-accuracy sensor signal acquisition.
For engineers reviewing the ADS8678IDBTR datasheet, ADS8678IDBTR pinout, ADS8678IDBTR application, or ADS8678IDBTR equivalent, this page delivers verified specifications, TSSOP-38 package layout, channel-independent gain/offset calibration, SPI-compatible daisy-chain interface support, and real-world performance data across –40°C to 125°C operation.
Technical Context
The ADS8678IDBTR integrates per-channel programmable gain amplifiers (PGA), 2nd-order anti-aliasing LPFs, overvoltage protection circuitry, and a precision 4.096-V internal reference with <20 ppm/°C drift. Each of its eight single-ended analog inputs supports independent range selection - including ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V, and unipolar variants - all maintaining 1-MΩ input impedance regardless of range.
Its successive approximation register (SAR) core achieves 85 dB SNR and ±0.25 LSB INL at 500 kSPS aggregate throughput, with conversion time of 850 ns and acquisition time of 1150 ns. The device operates from a single 5-V analog supply (AVDD = 4.75–5.25 V) and supports 1.65–5.25-V digital I/O via DVDD, enabling direct interfacing with modern microcontrollers and FPGAs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit SAR architecture delivering 16,384 discrete output codes with no missing codes guaranteed. |
| Sampling Rate | 500 kSPS aggregate throughput across all 8 channels - enables real-time monitoring of fast transients in power automation systems. |
| Input Ranges | Software-selectable per channel: ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V, or 0–10.24 V, 0–5.12 V, 0–2.56 V, 0–1.28 V. |
| INL / DNL | ±0.25 LSB integral nonlinearity and ±0.2 LSB differential nonlinearity - ensures <0.006% full-scale error in precision measurement applications. |
| SNR / THD | 85 dB signal-to-noise ratio and –100 dB total harmonic distortion at 1 kHz - supports high-fidelity acquisition of low-amplitude signals amid noise. |
| Overvoltage Protection | ±20 V absolute maximum rating on AIN_nP/AIN_nGND pins when AVDD = 5 V - eliminates need for external clamping in harsh industrial environments. |
| Reference | On-chip 4.096-V reference with ±0.002% typical gain error and 8 ppm/°C temperature drift - reduces BOM count and improves system-level dc accuracy. |
Pinout & Package
TSSOP-38 package (9.7 mm × 4.4 mm) with exposed thermal pad; RoHS-compliant, lead-free finish; rated for –40°C to +125°C industrial temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDI) | Digital input | Serial data input for SPI configuration and register writes; compatible with 1.65–5.25-V logic levels. |
| 2 (RST/PD) | Digital input | Active-low dual-function pin: reset device or enter low-power power-down mode (3 µA standby current). |
| 3 (DAISY) | Digital input | Enables daisy-chain mode; when asserted low, allows cascading multiple ADS8678 devices on shared SCLK/CS lines. |
| 4 (REFSEL) | Digital input | Selects internal (low) or external (high) reference source; controls REFIO pin direction and reference activation. |
| 5 (REFIO) | Analog I/O | Internal reference output (4.096 V) or external reference input (4.046–4.146 V); requires 10–22 µF decoupling to REFGND. |
| 6 (REFGND) | Power supply | Dedicated reference ground; must be shorted to analog ground plane and decoupled with REFIO and REFCAP. |
| 7 (REFCAP) | Analog output | Reference capacitor connection point; supplies stable 4.096-V reference to ADC core; requires 10–22 µF ceramic capacitor. |
| 8–9, 28–32 (AGND/AVDD) | Power supply | Multiple AGND and AVDD pins minimize ground bounce and supply impedance; each AVDD pair must be decoupled locally. |
| 10–11 (AUX_IN/AUX_GND) | Analog input | Dedicated auxiliary channel for diagnostics or secondary sensing; supports same input ranges and protection as main channels. |
| 12–27 (AIN_0P to AIN_7P/GND) | Analog input | Eight fully independent single-ended analog input pairs; each includes PGA, OVP, LPF, and programmable range control. |
| 33–34 (DGND/DVDD) | Power supply | Digital ground and supply; DVDD supports 1.65–5.25 V, enabling direct interface with 1.8-V, 3.3-V, or 5-V host controllers. |
| 35 (ALARM) | Digital output | Active-high interrupt indicating out-of-range condition on any channel; configurable per-channel high/low thresholds. |
| 36 (SDO) | Digital output | Serial data output; tri-state capable for daisy-chain operation; outputs 16-bit conversion results MSB-first. |
| 37 (SCLK) | Digital input | Serial clock input; supports up to 17 MHz; timing-critical for sampling synchronization and data capture. |
| 38 (CS) | Digital input | Active-low chip select; initiates serial communication; minimum pulse width 30 ns required for reliable frame start. |
Key Features
| Feature | Design Value |
|---|---|
| Channel-independent input range selection | Each of 8 analog inputs can be configured individually for ±10.24 V, ±5.12 V, etc., enabling mixed-signal acquisition without external scaling. |
| Constant 1-MΩ input impedance | Maintains identical loading across all input ranges - eliminates gain errors caused by source impedance variation in sensor networks. |
| Integrated 4.096-V reference with low drift | 8 ppm/°C max drift and ±0.002% typical gain error reduce calibration burden and improve long-term measurement stability. |
| Per-channel overvoltage protection | ±20-V fault tolerance on every AIN_nP/AIN_nGND pair - protects against wiring errors, surge events, and field-induced transients. |
| SPI-compatible daisy-chain interface | Single SCLK/CS bus supports up to 16 devices; DAISY pin enables seamless expansion without additional GPIO or address decoding. |
| Industrial temperature grade | Specified from –40°C to +125°C ambient; validated across full range for gain/offset linearity, SNR, and timing compliance. |
Applications
| Power Automation Monitoring | Protection Relay Input Stage |
|---|---|
|
Use Scenario: Real-time voltage and current sampling in medium-voltage switchgear for fault detection and waveform analysis. IC Role / Device Role / Timing Role: Primary 8-channel ADC capturing synchronized analog inputs at 500 kSPS with ±20-V OVP to withstand switching transients. Use Value: Eliminates external signal conditioning for ±10.24 V CT/PT outputs while maintaining 14-bit precision and <0.006% INL across temperature. |
Use Scenario: Analog input acquisition in IEC 61850-compliant digital relays requiring high immunity to EMI and field faults. IC Role / Device Role / Timing Role: Front-end ADC with per-channel programmable ranges and ALARM output triggering relay trip logic on threshold violation. Use Value: Reduces component count by integrating PGA, LPF, OVP, and reference - improving MTBF and simplifying PCB layout. |
| PLC Analog Input Module | Industrial Data Acquisition System |
|
Use Scenario: Modular I/O card in DIN-rail mounted PLCs acquiring sensor data from pressure, temperature, and flow transmitters. IC Role / Device Role / Timing Role: High-density 8-channel ADC supporting mixed unipolar/bipolar inputs with 1-MΩ impedance for universal transmitter compatibility. Use Value: Enables single hardware design for multiple input types (4–20 mA, 0–10 V, ±5 V) without jumpering or external resistors. |
Use Scenario: Standalone data logger for predictive maintenance, capturing vibration, acoustic emission, and thermal profiles in rotating equipment. IC Role / Device Role / Timing Role: Precision SAR ADC with 85 dB SNR and 500-kSPS throughput feeding FPGA-based FFT engine for spectral analysis. Use Value: Delivers sufficient dynamic range to resolve sub-millivolt signals in noisy factory environments without external amplification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8674IDBTR | 4-channel variant in identical TSSOP-38 package; shares same architecture, reference, OVP, and SPI interface but fewer input channels. | Lower channel count suits compact modules or cost-sensitive designs where only 4 inputs are required. | Select ADS8674IDBTR when board space or BOM cost constraints justify reduced channel density without sacrificing performance. |
| AD7606BSTZ | 8-channel, 16-bit SAR ADC with parallel/serial interface; requires external reference and lacks integrated OVP or programmable input ranges. | Higher resolution but demands more external components and layout effort for protection and signal conditioning. | Choose AD7606BSTZ only when 16-bit resolution is mandatory and system-level OVP and range flexibility can be implemented externally. |
Compared with ADS8674IDBTR and AD7606BSTZ, the ADS8678IDBTR uniquely combines 8-channel 14-bit precision, integrated ±20-V OVP, per-channel programmable ranges, and on-chip 4.096-V reference - reducing design complexity and validation effort for industrial analog input systems.
Availability
ADS8678IDBTR is available at Aetrix Electronics and suitable for power automation monitoring, protection relay input stages, and PLC analog input modules requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS8678IDBTR 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 connectivity technologies for industrial, automotive, and communications markets.
The ADS8678IDBTR belongs to TI's precision data acquisition portfolio, designed specifically for ruggedized industrial analog input systems requiring high accuracy, robustness, and simplified signal chain integration.
FAQ
What input voltage ranges does the ADS8678IDBTR support per channel?
The ADS8678IDBTR supports software-programmable input ranges per channel: bipolar options of ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, and ±0.64 V; unipolar options of 0–10.24 V, 0–5.12 V, 0–2.56 V, and 0–1.28 V. All ranges maintain a constant 1-MΩ input impedance, and the ADS8678IDBTR's integrated PGAs ensure accurate full-scale utilization without external scaling components.
Does the ADS8678IDBTR require an external reference voltage?
No - the ADS8678IDBTR includes a precision 4.096-V internal reference with 8 ppm/°C max drift and ±0.002% typical gain error. When REFSEL is pulled low, the ADS8678IDBTR enables its internal reference and drives REFIO at 4.096 V. An external reference (4.046–4.146 V) may be used by pulling REFSEL high, but it is not required for standard operation of the ADS8678IDBTR.
How does the ADS8678IDBTR handle overvoltage conditions on its analog inputs?
The ADS8678IDBTR provides ±20-V absolute maximum overvoltage protection on all AIN_nP and AIN_nGND pins when AVDD = 5 V - protecting against wiring faults, transient surges, and field-induced spikes. This integrated OVP eliminates the need for external TVS diodes or clamping circuits in most industrial applications, directly enhancing system reliability and reducing BOM cost for the ADS8678IDBTR.
Can multiple ADS8678IDBTR devices be connected in daisy-chain mode?
Yes - the ADS8678IDBTR supports SPI-compatible daisy-chain operation using the DAISY pin. When DAISY is asserted low, the ADS8678IDBTR forwards SDO data to the SDI of the next device in the chain, allowing up to 16 devices to share a single CS and SCLK line. This reduces GPIO usage and simplifies firmware for multi-channel expansion beyond 8 inputs using the ADS8678IDBTR.
What is the operating temperature range specified for the ADS8678IDBTR?
The ADS8678IDBTR is fully specified for industrial operation from –40°C to +125°C ambient temperature. All key parameters - including INL (±0.25 LSB), SNR (85 dB), gain error drift (1–4 ppm/°C), and timing compliance - are guaranteed across this range, making the ADS8678IDBTR suitable for deployment in enclosures near motors, transformers, or outdoor substations without derating.
ADS8678IDBTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 38-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8678IDBTR FAQ
1.How can I place an order for ADS8678IDBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8678IDBTR 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 ADS8678IDBTR reliable?
The price and inventory of ADS8678IDBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8678IDBTR is usually 5 days.
3.What payment methods are accepted for ADS8678IDBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8678IDBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8678IDBTR?
ADS8678IDBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8678IDBTR 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 ADS8678IDBTR?
For technical support, including ADS8678IDBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8678IDBTR requirements.
6.How does Aetrix verify that ADS8678IDBTR is sourced from the original manufacturer or authorized distributors?
All ADS8678IDBTR 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 ADS8678IDBTR meets industry standards.
7.What is the process for return or replacement of ADS8678IDBTR?
All ADS8678IDBTR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8678IDBTR, 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 ADS8678IDBTR part is unused and in its original packaging.
Return procedure for ADS8678IDBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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