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Texas Instruments ADS8674IDBT
- Part No.:
- ADS8674IDBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8674IDBT.pdf
- Description:
- IC ADC 14BIT SAR 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:326
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Product details
Overview
ADS8674IDBT 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, 500-kSPS aggregate throughput, and software-programmable bipolar/unipolar input ranges (e.g., ±10.24 V, 0–5.12 V). It serves as the core data acquisition IC in industrial PLC analog input modules.
For engineers reviewing the ADS8674IDBT datasheet, ADS8674IDBT pinout, ADS8674IDBT application, or ADS8674IDBT equivalent, this page delivers verified specifications, TSSOP-38 package mapping, channel-independent PGA configuration, SPI-compatible daisy-chain interface details, and real-world use cases in power automation and protection relay systems.
Technical Context
The ADS8674IDBT implements a successive approximation register (SAR) ADC architecture with per-channel programmable gain amplifiers (PGA), 4.096-V on-chip reference, and a 4-channel analog multiplexer supporting both auto-scan and manual channel selection modes. Each input channel features constant 1-MΩ resistive impedance and independent input range selection.
It operates from a single 5-V analog supply (AVDD = 4.75–5.25 V) and supports digital I/O voltages from 1.65 V to 5.25 V. The device integrates input overvoltage protection up to ±20 V (with low-impedance AVDD), ALARM output for per-channel high/low threshold detection, and auxiliary input (AUX_IN/AUX_GND) directly connected to the ADC core.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete output codes for high-precision DC and low-frequency AC measurements. |
| Sampling Rate | 500 kSPS aggregate - enables simultaneous sampling across all 4 channels at 125 kSPS each or burst-mode acquisition. |
| Input Ranges | Software-selectable per channel: ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V, or unipolar 0–10.24 V, 0–5.12 V, etc. - eliminates external signal conditioning for multi-range field inputs. |
| INL / DNL | ±0.25 LSB / ±0.2 LSB - ensures monotonicity and <0.0015% full-scale linearity error for calibration-critical applications. |
| SNR / THD | 85 dB / –100 dB - supports accurate measurement of small signals superimposed on large DC offsets or noise floors. |
| Input Impedance | 1 MΩ constant - maintains consistent loading across all input ranges and prevents gain errors due to source impedance variation. |
| Overvoltage Protection | ±20 V (with AVDD = 5 V) - protects against transient surges in industrial environments without external clamping circuitry. |
Pinout & Package
TSSOP-38 package (9.7 mm × 4.4 mm), thermally enhanced for industrial temperature operation (–40°C to +125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDI) | Digital Input | SPI serial data input; accepts command registers and configuration bits for channel/range selection. |
| 2 (RST/PD) | Digital Input | Active-low dual-function pin: resets internal logic or places device in ultra-low-power shutdown (<20 µA). |
| 3 (DAISY) | Digital Input | Enables daisy-chain mode; when low, allows cascading multiple ADS8674/ADS8678 devices on shared SPI bus. |
| 4 (REFSEL) | Digital Input | Selects reference source: low = internal 4.096-V reference enabled (REFIO = output); high = external reference mode (REFIO = input). |
| 5 (REFIO) | Analog I/O | Reference voltage node - outputs 4.096 V (internal mode) or accepts external reference (4.046–4.146 V) with low-drift buffer. |
| 6 (REFGND) | Power Supply | Dedicated reference ground - must be shorted to analog ground plane and decoupled with REFIO and REFCAP. |
| 7 (REFCAP) | Analog Output | ADC reference decoupling capacitor terminal - requires 10–22 µF low-ESR ceramic capacitor to stabilize reference voltage. |
| 8–9, 28–32, 38 (AGND/AVDD) | Power Supply | Multiple analog ground and supply pins minimize ground bounce and improve PSRR in noisy industrial layouts. |
| 10–11 (AUX_IN/AUX_GND) | Analog Input | Dedicated auxiliary differential input channel - bypasses multiplexer and PGA, connects directly to ADC for calibration or diagnostics. |
| 16–17, 18–19, 20–21, 22–23 (AIN_0P/GND to AIN_3P/GND) | Analog Input | Four fully isolated single-ended input pairs - each includes OVP, PGA, LPF, and driver; supports true bipolar/unipolar ranges. |
| 33–34 (DGND/DVDD) | Power Supply | Digital supply domain - DVDD supports 1.65–5.25 V, enabling direct interfacing with 1.8-V, 3.3-V, or 5-V host microcontrollers. |
| 35 (ALARM) | Digital Output | Open-drain active-high interrupt - asserts when any configured channel exceeds user-defined high/low thresholds. |
| 36 (SDO) | Digital Output | SPI serial data output - transmits conversion results MSB-first; tri-states when CS is high or during daisy-chain propagation. |
| 37 (SCLK) | Digital Input | SPI clock input - supports up to 17 MHz; timing-critical for tSU_DICK (5 ns setup) and tHT_CKDI (5 ns hold) on SDI. |
| 38 (CS) | Digital Input | Active-low chip select - initiates SPI frame; falling edge triggers acquisition start and enables SDO output. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel programmable input ranges | Each of 4 inputs independently selects ±10.24 V, ±5.12 V, ..., or 0–10.24 V, 0–5.12 V - eliminates external range-switching relays or op-amp reconfiguration. |
| Integrated 4.096-V reference with low drift | 8 ppm/°C max drift and 4.094–4.098 V tolerance at 25°C - removes need for external precision reference and reduces BOM count. |
| Constant 1-MΩ input impedance | Maintains 0.85–1.15 MΩ across temperature and all input ranges - ensures predictable gain accuracy regardless of sensor output impedance. |
| ±20-V input overvoltage protection | Withstands sustained ±20 V on AIN_nP/GND pins when AVDD = 5 V - eliminates external TVS diodes and series current-limiting resistors. |
| ALARM output with per-channel thresholds | Configurable high/low limits per channel trigger open-drain ALARM pin - enables real-time fault detection without host CPU polling. |
| SPI-compatible daisy-chain capability | DAISY pin enables synchronous readout from multiple ADS8674/ADS8678 devices using one SPI bus - reduces GPIO count and simplifies multi-module designs. |
Applications
| Power Automation Monitoring | Protection Relay Input Stage |
|---|---|
|
Use Scenario: Continuous monitoring of AC voltage/current waveforms, harmonic content, and RMS values in medium-voltage substations. IC Role / Device Role / Timing Role: Primary ADC for analog front-end of IEDs; digitizes conditioned CT/PT outputs at 500 kSPS aggregate rate with synchronized sampling. Use Value: 14-bit resolution and 85-dB SNR enable accurate harmonic analysis up to 50th order; ±20-V OVP withstands switching transients during fault events. |
Use Scenario: Real-time sampling of tripping coil currents, breaker status voltages, and auxiliary power rails in digital protective relays. IC Role / Device Role / Timing Role: Channel-isolated acquisition engine; each AIN pair monitors independent circuits with independent range and alarm settings. Use Value: Per-channel programmable ranges accommodate diverse sensor outputs (e.g., 0–5 V for status, ±10.24 V for current); ALARM pin triggers immediate trip logic on overcurrent. |
| PLC Analog Input Module | Industrial Data Logger |
|
Use Scenario: Modular 4-channel analog input card for DIN-rail mounted PLCs accepting field signals from RTDs, thermocouples (via conditioning), and 4–20 mA loops. IC Role / Device Role / Timing Role: Integrated data acquisition subsystem - replaces discrete op-amps, PGAs, references, and ADCs with single TSSOP-38 IC. Use Value: 1-MΩ constant input impedance interfaces directly with 4–20 mA receivers; software-configurable ranges eliminate hardware jumpers and reduce SKU proliferation. |
Use Scenario: Battery-powered remote sensor node logging temperature, pressure, and vibration in oil/gas wellheads or wind turbine nacelles. IC Role / Device Role / Timing Role: Low-power acquisition core; enters STDBY mode (3–4.5 mA) between bursts and PWR_DN mode (<20 µA) during extended sleep. Use Value: 65-mW typical active power and 3-µA standby current extend battery life; –40°C to +125°C rating ensures operation in extreme ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8678IPWR | 8-channel variant in same TSSOP-38 package; identical specs except channel count and pinout (extra AIN_4P/GND through AIN_7P/GND). | Requires PCB redesign to route 4 additional analog inputs; suitable only when >4 channels are needed per node. | Select ADS8678IPWR only if system demands ≥8 simultaneous analog inputs - ADS8674IDBT remains optimal for 4-channel cost- and space-constrained designs. |
| AD7949BCPZ-RL7 | 8-channel, 14-bit SAR ADC (Analog Devices); no integrated PGA, OVP, or reference; requires external 4.096-V ref and ±15-V supplies for ±10-V input support. | Lacks on-chip protection and front-end integration - demands additional components for industrial-grade robustness and range flexibility. | Choose AD7949BCPZ-RL7 only for designs already committed to external signal conditioning; ADS8674IDBT provides superior integration and reduced layout complexity. |
Compared with ADS8678IPWR and AD7949BCPZ-RL7, the ADS8674IDBT uniquely combines 4-channel count, integrated ±20-V OVP, 1-MΩ input impedance, and on-chip 4.096-V reference in a compact TSSOP-38 package - delivering lower total solution cost and higher reliability for industrial DAQ nodes.
Availability
ADS8674IDBT 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 traceability.
Supply support for ADS8674IDBT 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 industrial data acquisition solutions.
The ADS867x family - including ADS8674IDBT - was designed specifically for ruggedized industrial analog input systems requiring integrated protection, flexible range selection, and deterministic SPI-based acquisition in harsh electromagnetic environments.
FAQ
What is the maximum input voltage the ADS8674IDBT can tolerate without damage?
The ADS8674IDBT supports ±20 V absolute maximum input voltage on AIN_nP and AIN_nGND pins when AVDD = 5 V and presents a low-impedance path (<30 kΩ). This built-in overvoltage protection eliminates the need for external clamping components in industrial field wiring scenarios where transients or miswiring may occur.
Does the ADS8674IDBT require an external reference voltage?
No - the ADS8674IDBT includes a factory-trimmed 4.096-V internal reference with 8 ppm/°C max drift. When REFSEL is pulled low, REFIO outputs this reference; when REFSEL is high, REFIO accepts an external 4.046–4.146-V reference. The internal option reduces BOM count and improves system-level accuracy without external calibration.
How does the ADS8674IDBT handle different input signal ranges?
The ADS8674IDBT supports eight software-programmable input ranges per channel: five bipolar (±10.24 V to ±0.15625 × VREF) and three unipolar (0–10.24 V to 0–0.3125 × VREF). Range selection is performed via SPI register writes, enabling dynamic adaptation to varying sensor outputs without hardware changes.
Can multiple ADS8674IDBT devices be connected to a single SPI bus?
Yes - the ADS8674IDBT supports daisy-chain configuration via the DAISY pin. When DAISY is low, SDO of one device connects to SDI of the next, allowing sequential readout of conversion results from multiple ADS8674IDBT units using a single CS line and shared SCLK/SDI, reducing host controller pin count.
What is the power consumption of the ADS8674IDBT in active and standby modes?
In active mode at 500-kSPS with internal reference, the ADS8674IDBT draws 8.5–11.5 mA from AVDD and 0.5 mA from DVDD (total ~65 mW). In STDBY mode, it consumes 3–4.5 mA; in PWR_DN mode, current drops to 3–20 µA - enabling energy-efficient operation in battery-powered or thermally constrained industrial nodes.
ADS8674IDBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- PGA-MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 1.65V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 38-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8674IDBT FAQ
1.How can I place an order for ADS8674IDBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8674IDBT 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 ADS8674IDBT reliable?
The price and inventory of ADS8674IDBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8674IDBT is usually 5 days.
3.What payment methods are accepted for ADS8674IDBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8674IDBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8674IDBT?
ADS8674IDBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8674IDBT 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 ADS8674IDBT?
For technical support, including ADS8674IDBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8674IDBT requirements.
6.How does Aetrix verify that ADS8674IDBT is sourced from the original manufacturer or authorized distributors?
All ADS8674IDBT 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 ADS8674IDBT meets industry standards.
7.What is the process for return or replacement of ADS8674IDBT?
All ADS8674IDBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS8674IDBT, 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 ADS8674IDBT part is unused and in its original packaging.
Return procedure for ADS8674IDBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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