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Texas Instruments ADS8674IDBTR
- Part No.:
- ADS8674IDBTR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8674IDBTR.pdf
- Description:
- IC ADC 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,309
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Product details
Overview
ADS8674IDBTR from Texas Instruments is a 14-bit, 4-channel, single-supply SAR analog-to-digital converter with integrated analog front-end, ±20 V input overvoltage protection, 1 MΩ constant resistive input impedance, and 500 kSPS aggregate throughput. It supports software-programmable bipolar (±10.24 V to ±0.64 V) and unipolar (0 V to 10.24 V to 0 V to 1.28 V) input ranges per channel and operates across –40°C to 125°C for industrial power automation and protection relay systems.
For engineers reviewing the ADS8674IDBTR datasheet, ADS8674IDBTR pinout, ADS8674IDBTR application, or ADS8674IDBTR equivalent, key selection considerations include channel-independent gain/offset trimming, SPI-compatible daisy-chain interface, on-chip 4.096-V reference with <20 ppm/°C drift, ALARM output with per-channel high/low thresholds, and TSSOP-38 package compatibility with industrial PCB layouts.
Technical Context
The ADS8674IDBTR integrates a successive approximation register (SAR) ADC core with per-channel programmable gain amplifier (PGA), 4-channel analog multiplexer, and 2nd-order low-pass filter before conversion. Its analog front-end delivers true bipolar operation without external level-shifting circuitry, enabling direct connection of ±10 V sensor outputs.
Each input channel features independent overvoltage protection up to ±20 V, constant 1 MΩ input impedance regardless of range selection, and dedicated AIN_nP/AIN_nGND differential pairs. The device uses an internal 4.096-V reference with low-drift buffer and supports external reference via REFIO when REFSEL is high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete codes with no missing codes (NMC guaranteed) |
| Throughput Rate | 500 kSPS aggregate - enables real-time sampling of four channels at 125 kSPS each |
| Input Ranges | ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V (bipolar); 0–10.24 V, 0–5.12 V, 0–2.56 V, 0–1.28 V (unipolar) |
| INL / DNL | ±0.25 LSB / ±0.2 LSB - ensures high dc precision for calibration-critical applications like protection relays |
| SNR / THD | 85 dB / –100 dB - supports accurate measurement of low-level signals in noisy industrial environments |
| Operating Temp | –40°C to 125°C - qualified for under-hood, substation, and factory-floor deployment |
| Supply Voltages | AVDD = 4.75–5.25 V; DVDD = 1.65–5.25 V - enables flexible I/O interfacing with 1.8-V, 3.3-V, or 5-V host controllers |
Pinout & Package
TSSOP-38 package (9.7 mm × 4.4 mm), thermally enhanced with multiple AGND/DGND pins and dedicated analog/digital supply separation for noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDI) | Digital Input | SPI data-in signal; accepts command and configuration registers during serial communication |
| 2 (RST/PD) | Digital Input | Active-low dual-function pin: resets internal logic or places device in power-down mode (3 µA typical) |
| 4 (REFSEL) | Digital Input | Selects reference source: low enables internal 4.096-V reference; high disables it and allows external reference on REFIO |
| 5 (REFIO) | Analog I/O | Reference voltage node - output when REFSEL = low; input when REFSEL = high |
| 6 (REFGND) | Power Supply | Dedicated ground for reference circuitry; must be shorted to analog ground plane and decoupled with REFIO/REFCAP |
| 7 (REFCAP) | Analog Output | Reference decoupling capacitor terminal; requires 10–22 µF ceramic capacitor to REFGND for stable ADC reference |
| 16–23, 24–27 (AIN_0P to AIN_3P, AIN_0GND to AIN_3GND) | Analog Inputs | Four fully independent single-ended input channels with dedicated positive/negative terminals and per-channel OVP |
| 10/11 (AUX_IN/AUX_GND) | Analog Input | Dedicated auxiliary channel for monitoring reference voltage, supply rails, or external sensors |
| 35 (ALARM) | Digital Output | Active-high open-drain alarm flag indicating any channel exceeds user-configured high/low thresholds |
| 36–38 (SDO/SCLK/CS) | Digital I/O | SPI interface: SDO outputs conversion results; SCLK clocks data; CS enables serial communication |
Key Features
| Feature | Design Value |
|---|---|
| Channel-Independent Programmable Input Ranges | Each of four inputs supports independent selection of eight bipolar/unipolar ranges via SPI register write - eliminates external gain-switching circuitry |
| Integrated Overvoltage Protection | Withstands ±20 V on any AIN_nP/AIN_nGND pair without damage or performance degradation - reduces need for external TVS/clamping networks |
| Constant 1-MΩ Input Impedance | Maintains identical 1 MΩ resistive loading across all input ranges - ensures consistent sensor loading and simplifies anti-alias filter design |
| On-Chip 4.096-V Reference | Low-drift (8 ppm/°C max), buffered reference with 15-ms turn-on time - enables self-contained operation without external precision reference ICs |
| Daisy-Chain SPI Interface | DAISY input allows cascading multiple ADS8674/ADS8678 devices on one SPI bus - reduces GPIO count and simplifies multi-channel system expansion |
Applications
| Power Automation Monitoring | Protection Relay Input Stage |
|---|---|
Use Scenario: Real-time acquisition of AC voltage/current transformer outputs and DC bus voltages in medium-voltage switchgear. IC Role / Device Role / Timing Role: Primary 4-channel ADC capturing synchronized samples at 125 kSPS per channel for RMS, harmonic, and fault detection algorithms. Use Value: ±20 V OVP and 1 MΩ input impedance allow direct connection to CT/PT secondaries without burden resistors or protection diodes. | Use Scenario: Digitizing analog trip signals from current transformers and voltage sensors in IEC 61850-compliant digital relays. IC Role / Device Role / Timing Role: High-precision front-end ADC providing 14-bit resolution and <±0.25 LSB INL for accurate fault magnitude classification. Use Value: Channel-specific alarm thresholds (ALARM pin) enable hardware-accelerated overcurrent/undervoltage triggering independent of host MCU. |
| PLC Analog Input Module | Industrial Data Logger |
Use Scenario: Modular 4-channel analog input card for DIN-rail programmable logic controllers handling 0–10 V, ±5 V, and 4–20 mA (with external shunt) field signals. IC Role / Device Role / Timing Role: Standalone ADC subsystem with SPI interface, eliminating need for external PGA or reference components. Use Value: Software-selectable input ranges and integrated 4.096-V reference reduce BOM count and layout complexity versus discrete solutions. | Use Scenario: Battery-powered environmental monitor logging temperature, pressure, and vibration sensor outputs over extended periods. IC Role / Device Role / Timing Role: Low-power ADC operating at 5.5–8.5 mA analog supply current (IAVDD_STC) with standby mode (3–4.5 mA). Use Value: 125°C rated operation and internal reference stability ensure reliable long-term accuracy in unventilated enclosures. |
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 |
|---|---|---|---|
| ADS8678IPWR | 8-channel version in same TSSOP-38 package; identical specs except channel count and pin mapping (NC on ADS8674 pins 12–15, 24–27) | Requires PCB redesign to route additional AIN_4P/GND through AIN_7P/GND; not pin-compatible with ADS8674IDBTR | Select ADS8678IPWR only when 8-channel density justifies layout change and higher channel count is required. |
| AD7949BCPZ-RL7 | 8-channel, 14-bit SAR ADC with 1-MSPS rate; no integrated OVP or PGA; requires external reference and level-shifting for bipolar inputs | Lacks on-chip protection and analog front-end - demands additional external components for ±10 V input conditioning | Choose AD7949BCPZ-RL7 only if higher speed (1 MSPS) outweighs added design complexity and component cost. |
Compared with ADS8678IPWR and AD7949BCPZ-RL7, the ADS8674IDBTR provides optimal integration for 4-channel industrial DAQ: its per-channel OVP, constant 1-MΩ impedance, and software-configurable bipolar ranges eliminate six to ten external components typically needed in discrete front-end designs.
Availability
ADS8674IDBTR 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 qualification, and full production traceability.
Supply support for ADS8674IDBTR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The ADS867x family was designed specifically for high-reliability industrial data acquisition - integrating protection, precision, and configurability into a single-chip solution for protection relays, motor drives, and energy metering systems.
FAQ
What input voltage ranges does the ADS8674IDBTR support per channel?
The ADS8674IDBTR supports eight software-selectable input ranges per channel: bipolar options of ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, and ±0.64 V; and unipolar options of 0–10.24 V, 0–5.12 V, 0–2.56 V, and 0–1.28 V. Each channel's range is configured independently via SPI register writes, and the 1-MΩ input impedance remains constant across all ranges. This flexibility allows the ADS8674IDBTR to interface directly with diverse field sensors without external gain switching.
How does the ADS8674IDBTR handle overvoltage conditions on its analog inputs?
The ADS8674IDBTR provides integrated overvoltage protection (OVP) on all analog input pins (AIN_nP and AIN_nGND), rated for ±20 V when AVDD is powered and offers low impedance (<30 kΩ), or ±11 V when AVDD is floating. This protection operates without external components and prevents damage or latch-up during transient events such as wiring faults or ESD. The ADS8674IDBTR maintains functional integrity after exposure, eliminating the need for external TVS diodes or clamping circuits in most industrial installations.
Can the ADS8674IDBTR operate with an external reference voltage?
Yes, the ADS8674IDBTR supports external reference operation. When the REFSEL pin is driven high, the internal 4.096-V reference is disabled and the REFIO pin becomes an analog input accepting an external reference voltage between 4.046 V and 4.146 V. This mode allows system-level reference sharing or use of ultra-low-drift external references. The ADS8674IDBTR retains all performance specifications-including INL, SNR, and THD-when using a compliant external reference, provided proper decoupling is applied to REFCAP and REFGND.
What is the purpose of the ALARM pin on the ADS8674IDBTR?
The ALARM pin on the ADS8674IDBTR is an active-high, open-drain digital output that asserts when any enabled channel exceeds its individually programmable high or low threshold. These thresholds are set via SPI-accessible registers and updated in real time. The ALARM signal can trigger interrupt-driven responses in the host controller or drive external latching circuits. Because it operates independently of the host processor, the ADS8674IDBTR's ALARM function enables deterministic, low-latency fault response critical in protection relay and safety-critical applications.
Does the ADS8674IDBTR require separate analog and digital ground planes?
Yes, the ADS8674IDBTR requires physically separated analog (AGND) and digital (DGND) ground planes connected at a single point near the device. The datasheet specifies nine AGND pins (pins 8, 28–32) and one DGND pin (pin 33) to minimize coupling between analog signal paths and digital switching noise. Improper grounding-such as shared traces or star-point misplacement-degrades SNR and increases crosstalk. Layout guidelines in SBAS627 recommend routing AGND and DGND planes beneath their respective supply pins (AVDD and DVDD) and connecting them only at the power entry point or a dedicated ground tie point adjacent to the ADS8674IDBTR.
ADS8674IDBTR 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:
- -
ADS8674IDBTR FAQ
1.How can I place an order for ADS8674IDBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8674IDBTR 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 ADS8674IDBTR reliable?
The price and inventory of ADS8674IDBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8674IDBTR is usually 5 days.
3.What payment methods are accepted for ADS8674IDBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8674IDBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8674IDBTR?
ADS8674IDBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8674IDBTR 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 ADS8674IDBTR?
For technical support, including ADS8674IDBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8674IDBTR requirements.
6.How does Aetrix verify that ADS8674IDBTR is sourced from the original manufacturer or authorized distributors?
All ADS8674IDBTR 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 ADS8674IDBTR meets industry standards.
7.What is the process for return or replacement of ADS8674IDBTR?
All ADS8674IDBTR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8674IDBTR, 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 ADS8674IDBTR part is unused and in its original packaging.
Return procedure for ADS8674IDBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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