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Texas Instruments ADS8665IPW
- Part No.:
- ADS8665IPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8665IPW.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,362
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Product details
Overview
ADS8665IPW from Texas Instruments is a 12-bit, single-supply SAR analog-to-digital converter with integrated analog front-end, programmable bipolar/unipolar input ranges (±12.288 V to ±2.56 V or 0–12.288 V), 500 kSPS throughput, and on-chip 4.096-V reference. It delivers ±0.15 LSB INL, 74 dB SNR, and operates across –40°C to +125°C for industrial data acquisition systems.
For engineers reviewing the ADS8665IPW datasheet, ADS8665IPW pinout, ADS8665IPW application, or ADS8665IPW equivalent, this page provides verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional and interface differences.
Technical Context
The ADS8665IPW implements a successive approximation register (SAR) ADC architecture with integrated PGA, second-order LPF, overvoltage protection (±20 V), and software-configurable gain/offset calibration per input range. Its multiSPI™ interface supports daisy-chain operation and is backward-compatible with standard SPI protocols.
It uses a constant-resistance input structure (≥1 MΩ) independent of selected range, features an internal 4.096-V reference with 4 ppm/°C drift, and supports true bipolar conversion without external level-shifting circuitry. The device enters low-power standby (2.8 mA) or power-down (10 µA) modes via register control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with no missing codes guaranteed. |
| Throughput Rate | 500 kSPS - enables real-time sampling of signals up to ~200 kHz (Nyquist-limited). |
| INL / DNL | ±0.15 LSB / ±0.1 LSB - ensures high DC accuracy for precision sensor and control loop applications. |
| SNR / THD | 74 dB / –102 dB - supports clean digitization of low-distortion analog signals in noisy environments. |
| Input Ranges | Software-selectable: ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, ±2.56 V, or unipolar 0–12.288 V variants - eliminates external scaling components. |
| Supply Voltages | AVDD = 4.75–5.25 V; DVDD = 1.65–3.3 V - allows interoperability with 1.8-V or 3.3-V digital controllers. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, trackside signaling, and industrial PLC modules. |
Pinout & Package
TSSOP-16 package (5.00 mm × 4.40 mm) with exposed pad; RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN_P | Analog input positive | Differential input node accepting full-scale voltages up to ±12.288 V; high-impedance (≥1 MΩ) regardless of range selection. |
| AIN_GND | Analog input negative | Reference return for AIN_P; operates within ±0.1 V of system ground - enables pseudo-differential measurement. |
| CONVST/CS | Conversion start / chip select | Dual-function pin: rising edge initiates conversion; low state enables serial interface and tri-states SDO outputs when high. |
| SCLK | Serial clock input | Accepts up to 66.67 MHz clock; timing-critical for multiSPI read/write cycles and daisy-chain synchronization. |
| SDI | Serial data input | Receives configuration commands and range-selection registers; supports daisy-chain input during cascaded reads. |
| SDO-0 | Primary serial data output | Delivers 12-bit conversion result MSB-first; active only when CS is low and RVS indicates conversion completion. |
| ALARM/SDO-1/GPO | Multi-function output | Configurable as over-range alarm (high/low threshold), secondary data output, or general-purpose digital output. |
| RST | Active-low reset | Asynchronous hardware reset requiring ≥100 ns pulse width; restores default register settings and clears internal state. |
| REFIO | Reference I/O | Internal 4.096-V reference output or external reference input (4.046–4.146 V); requires 4.7 µF decoupling capacitor. |
| REFCAP | Reference buffer decoupling | Stabilizes internal reference voltage at ADC core; requires 10 µF low-ESR capacitor tied to REFGND. |
| AGND / DGND / REFGND | Ground terminals | Separate analog, digital, and reference ground pins - must be connected to dedicated low-impedance planes to maintain SNR. |
| AVDD / DVDD | Analog/digital supplies | 5-V analog rail powers ADC core and front-end; 1.65–3.3-V digital rail interfaces with host controller logic levels. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable bipolar/unipolar input ranges | Eight software-selectable spans (e.g., ±12.288 V, 0–10.24 V) eliminate external op-amp scaling networks and reduce BOM count. |
| Integrated 4.096-V reference with 4 ppm/°C drift | Enables stable absolute measurements across –40°C to +125°C without external reference IC or trimming. |
| Constant ≥1 MΩ input impedance | Maintains signal integrity and loading consistency across all input ranges - critical for high-impedance sensor interfacing. |
| ±20 V input overvoltage protection | Withstands transient surges beyond full-scale range without latch-up or damage - reduces need for external TVS/clamping. |
| multiSPI™ daisy-chain capability | Allows synchronous sampling of multiple ADS8665IPW devices using a single SCLK/SDI bus - simplifies multi-channel DAQ design. |
Applications
| Analog Input Modules | Mixed I/O Modules (AI/AO/DI/DO) |
|---|---|
Use Scenario: Industrial PLC analog input cards acquiring voltage/current signals from field transmitters. IC Role / Device Role / Timing Role: Primary ADC converting 4–20 mA loop signals or ±10 V sensor outputs into digital data for CPU processing. Use Value: Programmable ranges match diverse field device outputs without hardware reconfiguration; 500 kSPS supports oversampling for noise reduction. |
Use Scenario: Compact modular I/O systems integrating analog inputs, analog outputs, and digital I/O in one chassis. IC Role / Device Role / Timing Role: High-precision ADC subsystem providing synchronized sampling for closed-loop control feedback paths. Use Value: Integrated overvoltage protection and constant input impedance simplify front-end design; multiSPI enables tight channel-to-channel timing alignment. |
| Data Acquisition Systems (DAQ) | Trackside Signaling & Control |
Use Scenario: Portable or rack-mounted DAQ units capturing vibration, temperature, and pressure waveforms in test benches. IC Role / Device Role / Timing Role: Core SAR ADC delivering low-latency, high-fidelity digitization with minimal external support circuitry. Use Value: On-chip reference and calibrated INL/DNL ensure traceable measurement accuracy; wide temperature range supports uncooled enclosures. |
Use Scenario: Railway signaling equipment monitoring track circuit voltages and relay statuses in outdoor cabinets. IC Role / Device Role / Timing Role: Robust ADC handling long cable runs with induced transients and ambient temperature extremes. Use Value: ±20 V OVP protects against lightning-induced surges; –40°C to +125°C rating ensures reliability in sun-exposed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8661IPW | Same family, 1.25 MSPS throughput, identical pinout and register map - differs only in maximum sampling rate and acquisition time. | Preferred where higher bandwidth (>500 kSPS) is required; shares same PCB layout and firmware interface. | Select ADS8661IPW if system demands >500 kSPS sampling without changing hardware or driver code. |
| AD7476AARMZ | 12-bit SAR ADC (1 MSPS), no integrated AFE, no programmable ranges, requires external reference and input conditioning. | Used in cost-sensitive, space-constrained designs where input signal conditioning is already handled externally. | Choose AD7476AARMZ only when board area and BOM cost outweigh benefits of integrated front-end and range flexibility. |
Compared with ADS8665IPW, ADS8661IPW offers higher speed but identical feature set and footprint, while AD7476AARMZ reduces integration to lower cost at the expense of design complexity and calibration effort.
Availability
ADS8665IPW is available at Aetrix Electronics and suitable for analog input modules, mixed I/O modules, and industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and extended temperature performance.
Supply support for ADS8665IPW 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 specializing in analog and embedded processing technologies, with leadership in precision data converters and industrial-grade ICs.
The ADS866x series was designed specifically for rugged industrial data acquisition - integrating front-end protection, programmable ranges, and robust serial interfaces to replace multi-component ADC subsystems.
FAQ
What is the maximum sampling rate of the ADS8665IPW?
The ADS8665IPW achieves a maximum throughput rate of 500 kSPS under specified operating conditions (AVDD = 5 V, DVDD = 3.3 V). This corresponds to a minimum conversion cycle time of 2 µs and supports accurate digitization of signals up to ~200 kHz. The ADS8665IPW's acquisition time is 1000 ns, and conversion time is 1000 ns - both fixed values defined in the datasheet.
Does the ADS8665IPW require an external reference voltage?
No, the ADS8665IPW includes an on-chip 4.096-V reference with 4 ppm/°C temperature drift, eliminating the need for an external reference in most applications. However, the REFIO pin can accept an external reference (4.046–4.146 V) if higher accuracy or different voltage is required. When using the internal reference, a 4.7 µF capacitor on REFIO and a 10 µF capacitor on REFCAP are mandatory.
How does the programmable input range work on the ADS8665IPW?
The ADS8665IPW supports eight software-programmable input ranges - five bipolar (±12.288 V to ±2.56 V) and four unipolar (0–12.288 V to 0–5.12 V) - selected by writing to internal configuration registers via the multiSPI interface. Gain and offset errors are factory-trimmed per range, ensuring dc precision without recalibration. The input impedance remains ≥1 MΩ across all ranges.
What protection features does the ADS8665IPW include for harsh environments?
The ADS8665IPW integrates ±20 V input overvoltage protection on AIN_P and AIN_GND pins when AVDD = 5 V, and ±15 V protection when AVDD is floating. It also features ESD ratings of ±4 kV HBM on analog inputs and ±2 kV HBM on digital pins. Combined with its –40°C to +125°C operating range and robust TSSOP package, it is suited for railway, energy, and factory automation deployments.
Can multiple ADS8665IPW devices be connected in daisy-chain mode?
Yes, the ADS8665IPW supports daisy-chain configuration via its multiSPI™ interface. In this mode, SDI of the first device connects to SDO-0 of the next, allowing serial data from multiple converters to be read back through a single SDO line. The CONVST/CS and SCLK lines are shared, enabling synchronized sampling across all chained devices with minimal GPIO usage.
ADS8665IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- ADS866x
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- PGA-ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 1.65V ~ 5.25V
- Features:
- Internal Oscillator, PGA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8665IPW FAQ
1.How can I place an order for ADS8665IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8665IPW 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 ADS8665IPW reliable?
The price and inventory of ADS8665IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8665IPW is usually 5 days.
3.What payment methods are accepted for ADS8665IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8665IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8665IPW?
ADS8665IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8665IPW 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 ADS8665IPW?
For technical support, including ADS8665IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8665IPW requirements.
6.How does Aetrix verify that ADS8665IPW is sourced from the original manufacturer or authorized distributors?
All ADS8665IPW 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 ADS8665IPW meets industry standards.
7.What is the process for return or replacement of ADS8665IPW?
All ADS8665IPW units undergo pre-shipment inspection (PSI). If there is an issue with ADS8665IPW, 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 ADS8665IPW part is unused and in its original packaging.
Return procedure for ADS8665IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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