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Texas Instruments ADS8664IDBT
- Part No.:
- ADS8664IDBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8664IDBT.pdf
- Description:
- IC ADC 12BIT SAR 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
ADS8664IDBT from Texas Instruments is a 12-bit, 4-channel, single-supply SAR analog-to-digital converter with integrated analog front-end, 500-kSPS aggregate throughput, ±0.2 LSB INL/DNL, 73.8 dB SNR, and on-chip 4.096-V reference. It supports channel-independent bipolar (±10.24 V to ±0.64 V) and unipolar (0 V to 10.24 V) input ranges for industrial data acquisition systems.
For engineers reviewing the ADS8664IDBT datasheet, ADS8664IDBT pinout, ADS8664IDBT application, or ADS8664IDBT equivalent, this page delivers verified specifications, TSSOP-38 package details, SPI-compatible daisy-chain interface support, ALARM output functionality, and real-world use cases in protection relays and PLC analog input modules.
Technical Context
The ADS8664IDBT implements a successive approximation register (SAR) ADC core operating at up to 500 kSPS with no latency, paired with per-channel programmable gain amplifiers and 1-MΩ constant resistive input impedance across all ranges. Its integrated analog front-end includes overvoltage protection up to ±20 V and independent channel configuration via SPI registers.
It features an on-chip 4.096-V reference with 8 ppm/°C drift, supports both internal and external reference modes via REFSEL/REFIO, and provides auxiliary input (AUX_IN/AUX_GND) and ALARM output for high/low threshold monitoring - all within a single 5-V analog supply and 1.65–5-V I/O voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture delivering 4096 discrete output codes with no missing codes guaranteed. |
| Throughput Rate | 500 kSPS aggregate sampling rate across all 4 channels without pipeline latency. |
| Input Ranges | Software-selectable per channel: bipolar ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V; unipolar 0–10.24 V, 0–5.12 V, 0–2.56 V, 0–1.28 V. |
| INL / DNL | ±0.2 LSB maximum integral and differential nonlinearity ensures accurate code transitions and monotonicity. |
| SNR / THD | 73.8 dB signal-to-noise ratio and –95 dB total harmonic distortion at 1 kHz for high-fidelity measurement. |
| Input Impedance | 1 MΩ constant resistive input impedance across all ranges, enabling direct sensor interfacing without external buffering. |
| Overvoltage Protection | ±20 V fault tolerance on analog inputs when AVDD = 5 V, eliminating need for external clamping circuits. |
| Reference | Integrated 4.096-V reference with 8 ppm/°C drift; externally adjustable via REFIO pin with 10–22 µF decoupling. |
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 |
|---|---|---|
| AIN_0P to AIN_3P / AIN_0GND to AIN_3GND | Analog input channels (4 single-ended) | Dedicated positive/negative inputs for each of four measurement channels; GND pins must be decoupled locally. |
| CS, SCLK, SDI, SDO, DAISY | SPI serial interface signals | Standard 4-wire SPI with daisy-chain capability; CS active-low enables device selection; DAISY allows cascading multiple ADS866x devices. |
| REFSEL, REFIO, REFCAP, REFGND | Reference control and decoupling | REFSEL selects internal/external reference; REFIO outputs 4.096 V or accepts external reference; REFCAP/REFGND require 10–22 µF ceramic capacitor. |
| RST/PD | Reset and power-down control | Active-low dual-function pin: hard reset on falling edge; entry into low-power mode when held low during conversion idle. |
| AUX_IN / AUX_GND | Auxiliary analog input | Dedicated 12-bit auxiliary channel supporting same input ranges as main channels, usable for diagnostics or secondary sensing. |
| ALARM | Programmable threshold alert | Open-drain digital output asserting high when any channel exceeds user-configured high/low thresholds. |
| AVDD, DVDD, AGND, DGND | Power supply domains | Separate 5-V analog and 1.65–5-V digital supplies with dedicated ground planes minimize coupling noise between domains. |
Key Features
| Feature | Design Value |
|---|---|
| Channel-independent range selection | Each of four analog inputs can be independently configured for different bipolar/unipolar ranges via SPI register writes. |
| Constant 1-MΩ input impedance | Eliminates gain error variation across input ranges, simplifying sensor interface design and calibration. |
| ±20-V overvoltage protection | Withstands transient surges beyond rated input spans without damage or latch-up, reducing system-level protection component count. |
| On-chip 4.096-V reference | Provides stable, low-drift reference source with <10 ppm/°C total error, removing dependency on external precision references. |
| ALARM output with per-channel thresholds | Hardware-accelerated monitoring enables real-time fault detection without host CPU intervention or software polling overhead. |
| SPI daisy-chain support | Enables synchronous sampling across multiple ADS8664/ADS8668 devices using a single host SPI bus, reducing PCB routing complexity. |
Applications
| Power Automation | Protection Relays |
|---|---|
Use Scenario: Monitoring AC line voltage, current, and frequency in medium-voltage switchgear for grid stability analysis. IC Role / Device Role / Timing Role: Primary ADC for digitizing isolated sensor outputs with synchronized sampling across phases. Use Value: 500-kSPS throughput and ±0.2 LSB INL enable accurate RMS calculation and harmonic analysis per IEC 61850 standards. | Use Scenario: Detecting overcurrent, overvoltage, and earth fault conditions in substation protection schemes. IC Role / Device Role / Timing Role: Fault-sensing ADC with ALARM output triggering immediate trip logic upon threshold violation. Use Value: ±20-V OVP and –40°C to 125°C operation ensure reliable performance under harsh electrical transients and ambient extremes. |
| PLC Analog Input Modules | Industrial Data Loggers |
Use Scenario: Converting 4–20 mA, ±10 V, or thermocouple signals from field instruments into digital values for controller processing. IC Role / Device Role / Timing Role: Multi-range front-end ADC with channel-specific scaling and built-in reference for modular I/O card design. Use Value: 1-MΩ input impedance and software-programmable ranges eliminate external gain-switching circuitry and reduce BOM cost. | Use Scenario: Long-term environmental monitoring of temperature, pressure, and vibration in remote infrastructure sites. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC capturing slow-varying sensor data with minimal host interaction. Use Value: 65-mW typical power consumption and STDBY mode (3–4.5 mA) extend battery life while maintaining measurement integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8668IPWR | 8-channel variant in TSSOP-38; identical architecture, specs, and pinout except for additional AIN_4P–AIN_7P/GND pins. | Supports higher channel density in same footprint; requires PCB layout changes for unused pins. | Select ADS8668IPWR only if 8-channel count is required; ADS8664IDBT offers lower channel count with identical performance per channel. |
| AD7476AARMZ | Single-channel 12-bit SAR ADC; no integrated PGA, multiplexer, reference, or OVP; requires external components for multi-range support. | Lacks channel independence, ALARM, and robust front-end - suitable only for simple point measurements. | Choose AD7476AARMZ only for cost-sensitive, single-input designs where system-level protection and flexibility are handled externally. |
Compared with ADS8668IPWR, ADS8664IDBT reduces channel count without sacrificing per-channel accuracy or feature set; compared with AD7476AARMZ, it integrates critical analog functions that would otherwise require 5+ discrete components and significant layout effort.
Availability
ADS8664IDBT is available at Aetrix Electronics and suitable for power automation, protection relays, and PLC analog input modules requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceability.
Supply support for ADS8664IDBT 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 precision data converters and industrial-grade ICs.
The ADS866x product line was designed specifically for rugged industrial data acquisition, integrating signal conditioning, protection, and digital interface into a single IC to simplify high-channel-count, high-reliability measurement systems.
FAQ
What input voltage ranges does the ADS8664IDBT support?
The ADS8664IDBT supports eight software-selectable input ranges per channel: bipolar ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V and unipolar 0–10.24 V, 0–5.12 V, 0–2.56 V, 0–1.28 V. Each range maps to full-scale 4096-code output with 1-MΩ constant input impedance, and all ranges are independently configurable via SPI register writes. The ADS8664IDBT achieves this using integrated programmable gain amplifiers and internal trimming.
Does the ADS8664IDBT require an external reference voltage?
No, the ADS8664IDBT includes an on-chip 4.096-V reference with 8 ppm/°C drift and 4.094–4.098 V tolerance at 25°C. When REFSEL is low, REFIO outputs this internal reference; when REFSEL is high, REFIO accepts an external 4.046–4.146 V reference. The ADS8664IDBT uses this reference for ADC conversion and supports decoupling with 10–22 µF capacitors on REFCAP and REFIO.
How does the ALARM output function on the ADS8664IDBT?
The ALARM output on the ADS8664IDBT is an active-high, open-drain signal that asserts when any enabled channel exceeds its individually programmed high or low threshold. Thresholds are set via SPI-accessible registers, and ALARM status is latched until cleared by host read or reset. This hardware-based alert eliminates continuous polling and enables fast response in protection relay and fault-monitoring applications using the ADS8664IDBT.
Can multiple ADS8664IDBT devices be connected in daisy-chain mode?
Yes, the ADS8664IDBT supports SPI daisy-chain configuration using the DAISY pin. In this mode, SDO of one device connects to SDI of the next, allowing synchronized sampling and register access across multiple ADS8664IDBT units using a single host SPI interface. The ADS8664IDBT maintains full 500-kSPS throughput per device in daisy-chain mode, with timing compliance verified per SBAS492 timing requirements.
What is the operating temperature range for the ADS8664IDBT?
The ADS8664IDBT is specified for industrial operation from –40°C to +125°C ambient temperature. This rating is validated across all electrical characteristics including INL (±0.2 LSB), SNR (71.4–73.85 dB), and input impedance (0.85–1.15 MΩ), with gain error drift limited to 1–5 ppm/°C and offset drift to 1–12 ppm/°C depending on input range. The TSSOP-38 package provides thermal resistance (RθJA) of 68.8°C/W for reliable performance in enclosed enclosures.
ADS8664IDBT 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:
- 12
- 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 ~ 10V
- 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:
- -
ADS8664IDBT FAQ
1.How can I place an order for ADS8664IDBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8664IDBT 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 ADS8664IDBT reliable?
The price and inventory of ADS8664IDBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8664IDBT is usually 5 days.
3.What payment methods are accepted for ADS8664IDBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8664IDBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8664IDBT?
ADS8664IDBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8664IDBT 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 ADS8664IDBT?
For technical support, including ADS8664IDBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8664IDBT requirements.
6.How does Aetrix verify that ADS8664IDBT is sourced from the original manufacturer or authorized distributors?
All ADS8664IDBT 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 ADS8664IDBT meets industry standards.
7.What is the process for return or replacement of ADS8664IDBT?
All ADS8664IDBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS8664IDBT, 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 ADS8664IDBT part is unused and in its original packaging.
Return procedure for ADS8664IDBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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