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Texas Instruments ADS8664IDBTR
- Part No.:
- ADS8664IDBTR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8664IDBTR.pdf
- Description:
- IC ADC 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,959
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Product details
Overview
ADS8664IDBTR from Texas Instruments is a 12-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, 0–10.24 V). It serves as a precision data acquisition IC in industrial PLC analog input modules.
For engineers reviewing the ADS8664IDBTR datasheet, ADS8664IDBTR pinout, ADS8664IDBTR application, or ADS8664IDBTR equivalent, this page delivers verified specifications, channel-independent gain/offset calibration, SPI-compatible daisy-chain interface support, 1-MΩ constant input impedance, and ALARM output for per-channel high/low threshold monitoring - all critical for ruggedized industrial signal conditioning designs.
Technical Context
The ADS8664IDBTR implements a successive approximation register (SAR) ADC core operating at up to 500 kSPS with no pipeline latency. Each of its four single-ended analog input channels includes a dedicated programmable gain amplifier (PGA), 2nd-order low-pass filter, and overvoltage protection circuitry rated for ±20 V continuous fault tolerance.
It integrates a 4.096-V on-chip reference with 8 ppm/°C drift and supports external reference via REFIO. The digital interface uses a CMOS-compatible SPI protocol with chip-select (CS), serial clock (SCLK), data-in (SDI), data-out (SDO), and daisy-chain (DAISY) signals - enabling multi-device synchronization without additional control lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity digitization of sensor and process signals. |
| Sampling Rate | 500 kSPS aggregate - supports simultaneous sampling across all 4 channels at full resolution without interleaving artifacts. |
| 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, etc. - eliminates external scaling for diverse field transducers. |
| INL / DNL | ±0.2 LSB max - ensures monotonicity and <0.005% full-scale linearity error for closed-loop control accuracy. |
| SNR / THD | 73.8 dB SNR, –95 dB THD - enables clean digitization of low-distortion analog waveforms up to ~1 kHz bandwidth. |
| Input Impedance | 1 MΩ constant - independent of selected range, simplifying anti-aliasing filter design and reducing loading on source circuits. |
| Overvoltage Protection | ±20 V on AIN_nP/GND pins - protects against transient surges in industrial environments without external clamping diodes. |
| Operating Temperature | –40°C to +125°C - qualified for deployment in harsh environments including motor control cabinets and outdoor substations. |
Pinout & Package
TSSOP-38 package (9.7 mm × 4.4 mm), thermally enhanced for industrial ambient operation. Pin functions validated per TI SBAS492 Rev. J (2015).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDI) | Digital Input | SPI serial data input; accepts command and configuration registers during write cycles. |
| 2 (RST/PD) | Digital Input | Active-low dual-function pin: resets internal logic or places device in power-down mode (1 µA typical). |
| 3 (DAISY) | Digital Input | Enables daisy-chain mode; when asserted low, routes SDO output to next device's SDI input. |
| 4 (REFSEL) | Digital Input | Selects internal (low) or external (high) reference; configures REFIO as output or input accordingly. |
| 5 (REFIO) | Analog I/O | Internal 4.096-V reference output or external reference input; requires 10–22 µF decoupling to REFGND. |
| 6 (REFGND) | Reference Ground | Dedicated analog ground for reference circuitry; must be shorted to AGND plane with minimal trace inductance. |
| 7 (REFCAP) | Analog Output | ADC reference decoupling node; connects to 10–22 µF capacitor to stabilize internal reference buffer. |
| 8–9, 28–32 (AGND/AVDD) | Analog Power | Multiple AGND and AVDD pins reduce ground bounce and supply impedance for high-precision conversion. |
| 10–11 (AUX_IN/AUX_GND) | Analog Input | Dedicated auxiliary 12-bit channel for system monitoring (e.g., supply voltage, temperature sensor). |
| 16–23, 24–27 (AIN_0P to AIN_3P/GND) | Analog Input | Four fully differential-capable single-ended input pairs; each includes PGA, LPF, and ±20 V OVP. |
| 33–34 (DGND/DVDD) | Digital Power | Separate digital supply domain (1.65–5.25 V) enables direct interfacing with 1.8-V, 3.3-V, or 5-V microcontrollers. |
| 35 (ALARM) | Digital Output | Open-drain active-high interrupt signaling channel-specific over/under-range events per user-defined thresholds. |
| 36 (SDO) | Digital Output | SPI serial data output; tri-states when CS is high or during daisy-chain forwarding. |
| 37 (SCLK) | Digital Input | Up to 17 MHz SPI clock input; timing-critical for data capture and command execution. |
| 38 (CS) | Digital Input | Active-low chip select; initiates SPI frame and controls SDO output enable timing. |
Key Features
| Feature | Design Value |
|---|---|
| Channel-independent input range selection | Each of 4 inputs can be configured independently for ±10.24 V, 0–5.12 V, etc., enabling mixed-signal acquisition without external multiplexers. |
| Integrated 4.096-V reference with low drift | 8 ppm/°C tempco and 4.094–4.098 V tolerance at 25°C - eliminates need for external precision reference in most applications. |
| 1-MΩ constant input impedance | Maintains identical loading across all 6 input ranges, simplifying anti-aliasing filter design and ensuring consistent signal integrity. |
| Per-channel ALARM generation | Configurable high/low thresholds per input channel trigger open-drain ALARM output - enables real-time fault detection without host polling. |
| SPI daisy-chain capability | DAISY pin allows cascading multiple ADS8664IDBTR devices on one SPI bus, reducing GPIO count and PCB routing complexity. |
| Industrial-grade thermal performance | RθJA = 68.8°C/W in TSSOP-38 - supports reliable operation at 125°C ambient when mounted on 2-oz copper with thermal vias. |
Applications
| Power Automation | Protection Relays |
|---|---|
|
Use Scenario: Digitizing AC voltage/current waveforms and DC auxiliary signals in medium-voltage switchgear monitoring units. IC Role / Device Role / Timing Role: Primary 4-channel ADC capturing synchronized voltage, current, frequency, and battery voltage at 500 kSPS with ±20 V surge immunity. Use Value: Eliminates external signal conditioning and reference components while maintaining ±0.2 LSB linearity across –40°C to 125°C. |
Use Scenario: Real-time sampling of CT/PT secondary outputs and trip coil status in digital overcurrent and earth-fault relays. IC Role / Device Role / Timing Role: High-reliability analog front-end converting isolated analog inputs into precise digital values for DSP-based fault detection algorithms. Use Value: 1-MΩ input impedance prevents loading of high-impedance CT burden resistors; ALARM pin flags out-of-range conditions before firmware intervention. |
| PLC Analog Input Modules | Industrial Data Loggers |
|
Use Scenario: Modular I/O cards acquiring 4 channels of 4–20 mA loop signals, thermocouple outputs, or RTD bridge voltages in DIN-rail PLCs. IC Role / Device Role / Timing Role: Integrated SAR ADC with programmable bipolar/unipolar ranges and on-chip reference - replaces discrete op-amp, reference, and ADC subsystems. Use Value: Reduces BOM count by ≥7 components per channel and supports hot-swappable module calibration via software-configurable gain/offset registers. |
Use Scenario: Battery-powered environmental monitors logging temperature, pressure, and humidity from industrial sensors over extended periods. IC Role / Device Role / Timing Role: Low-power 12-bit ADC with 3–4.5 mA standby current and configurable sample rate - extends battery life while preserving measurement fidelity. Use Value: Internal reference and 1-MΩ input simplify sensor interface; AUX_IN channel monitors battery voltage for predictive low-power alerts. |
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 same TSSOP-38 package; identical specs except channel count and pinout (extra AIN_4P/GND through AIN_7P/GND). | Requires PCB redesign due to different analog input pin assignments; not pin-compatible with ADS8664IDBTR. | Select when >4 channels are needed and layout flexibility exists; shares same driver stack and register map. |
| AD7949BCPZ-RL7 | 8-channel, 14-bit SAR ADC with 1-MSPS rate; no integrated OVP or programmable input ranges; requires external reference and signal conditioning. | Higher resolution but lacks ±20 V protection and channel-independent range selection - increases system-level component count and validation effort. | Choose for higher-resolution applications where external protection and scaling are already implemented; not drop-in replaceable. |
Compared with ADS8668IPWR and AD7949BCPZ-RL7, the ADS8664IDBTR uniquely combines 4-channel integration, ±20 V OVP, software-selectable ranges, and on-chip reference in a compact TSSOP-38 - delivering lowest system-level cost and fastest time-to-deployment for industrial 4-channel DAQ.
Availability
ADS8664IDBTR is available at Aetrix Electronics and suitable for power automation, protection relay, and PLC analog input module designs requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS8664IDBTR 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 heritage in high-reliability industrial data acquisition solutions.
The ADS866x family was designed specifically for ruggedized industrial signal conditioning - integrating protection, precision, and configurability into a single IC to replace multi-component front-ends in PLCs, relays, and energy meters.
FAQ
What input voltage ranges does the ADS8664IDBTR support per channel?
The ADS8664IDBTR supports six bipolar ranges (±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V, ±0.3125 V) and six unipolar ranges (0–10.24 V, 0–5.12 V, 0–2.56 V, 0–1.28 V, 0–0.64 V, 0–0.3125 V), all selectable independently per channel via SPI register writes. This eliminates external gain-switching circuitry and enables mixed-range acquisition on a single ADS8664IDBTR device.
Does the ADS8664IDBTR require an external reference voltage?
No - the ADS8664IDBTR includes a factory-trimmed 4.096-V internal reference with 8 ppm/°C drift and 4.094–4.098 V tolerance at 25°C. External reference is optional and enabled only when REFSEL is high; otherwise, REFIO operates as a buffered output. Using the internal reference reduces BOM count and board space versus solutions requiring external precision references.
How does the ALARM pin function on the ADS8664IDBTR?
The ALARM pin is an open-drain output that asserts high when any enabled channel exceeds its individually programmed high-threshold or falls below its low-threshold value. Thresholds are set via dedicated SPI registers per channel. This hardware interrupt eliminates continuous host polling and enables immediate response to out-of-bounds conditions in safety-critical systems like protection relays.
Can multiple ADS8664IDBTR devices be connected on the same SPI bus?
Yes - the ADS8664IDBTR supports daisy-chain configuration using the DAISY pin. When DAISY is pulled low, the SDO output is routed internally to the next device's SDI input, allowing up to N devices to share one CS/SCLK/SDI line while maintaining individual addressing via sequential readback. This reduces MCU GPIO usage and simplifies routing in multi-channel systems.
What is the input protection rating of the ADS8664IDBTR?
The ADS8664IDBTR provides ±20 V continuous overvoltage protection on all analog input pins (AIN_nP and AIN_nGND) when AVDD is powered and presents low impedance (<30 kΩ). This withstands common industrial transients without damage or latch-up, eliminating the need for external TVS diodes or series resistors in most field deployments - a key reliability advantage over unprotected ADCs.
ADS8664IDBTR 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:
- -
ADS8664IDBTR FAQ
1.How can I place an order for ADS8664IDBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8664IDBTR 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 ADS8664IDBTR reliable?
The price and inventory of ADS8664IDBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8664IDBTR is usually 5 days.
3.What payment methods are accepted for ADS8664IDBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8664IDBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8664IDBTR?
ADS8664IDBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8664IDBTR 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 ADS8664IDBTR?
For technical support, including ADS8664IDBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8664IDBTR requirements.
6.How does Aetrix verify that ADS8664IDBTR is sourced from the original manufacturer or authorized distributors?
All ADS8664IDBTR 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 ADS8664IDBTR meets industry standards.
7.What is the process for return or replacement of ADS8664IDBTR?
All ADS8664IDBTR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8664IDBTR, 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 ADS8664IDBTR part is unused and in its original packaging.
Return procedure for ADS8664IDBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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