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Texas Instruments ADS8685IPW
- Part No.:
- ADS8685IPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8685IPW.pdf
- Description:
- IC ADC 16BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,614
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Product details
Overview
ADS8685IPW from Texas Instruments is a 16-bit, 500 kSPS successive approximation register (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), on-chip 4.096-V low-drift reference, and multiSPI™ interface. It operates from a single 5-V analog supply with 1.65–5-V I/O compatibility and delivers ±0.5 LSB INL, 92 dB SNR, and –112 dB THD in industrial servo drive control systems.
For engineers reviewing the ADS8685IPW datasheet, ADS8685IPW pinout, ADS8685IPW application, or ADS8685IPW equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for high-precision data acquisition in extended temperature environments (–40°C to +125°C).
Technical Context
The ADS8685IPW implements a true single-supply SAR ADC architecture with integrated PGA, 2nd-order LPF, overvoltage protection (±20 V), and software-configurable gain/offset calibration per input range. Its analog front-end maintains ≥1 MΩ resistive input impedance across all 9 selectable ranges, enabling direct connection to sensors without external buffering.
Digital interface flexibility includes standard SPI and multiSPI™ modes (daisy-chain capable), with three clocking options: asynchronous CS-driven, source-synchronous external clock, and source-synchronous internal clock. The RVS pin provides real-time conversion status, while ALARM/SDO-1/GPO supports high/low threshold monitoring independent of data reads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees 65,536 discrete output codes for high-fidelity signal digitization |
| Sampling Rate | 500 kSPS - enables accurate capture of signals up to ~200 kHz (Nyquist-limited) |
| INL / DNL | ±0.5 LSB / ±0.4 LSB - ensures monotonicity and <0.0076% full-scale linearity error |
| SNR / THD | 92 dB / –112 dB - supports >15-bit effective resolution with ultra-low harmonic distortion |
| Input Ranges | Software-selectable ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, ±2.56 V, or 0–12.288 V, etc. - eliminates external level-shifting circuitry |
| Reference | On-chip 4.096-V ±7 ppm/°C drift - removes need for external precision reference and reduces BOM count |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, motor control, and industrial PLC environments |
Pinout & Package
TSSOP-16 (PW) package: 5.00 mm × 4.40 mm body, surface-mount, leaded, RoHS-compliant. Requires standard reflow profile and 0.65-mm pitch PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN_P / AIN_GND | Differential analog input pair | Accepts true bipolar inputs up to ±12.288 V; high-impedance (≥1 MΩ) and protected to ±20 V |
| CONVST/CS | Conversion start / chip select | Active-high edge triggers sampling; active-low enables serial bus access and tri-states SDO outputs |
| SCLK / SDI / SDO-0 / SDO-1 | multiSPI™ serial interface | Supports daisy-chain topology; SDO-1 doubles as ALARM output or GPO for system-level event signaling |
| RST | Asynchronous reset | Active-low pulse (≥100 ns) forces hardware reset and clears internal registers |
| REFIO / REFCAP / REFGND | Reference buffer interface | REFIO outputs 4.096 V (or accepts external ref); REFCAP requires 10-μF decoupling for stable ADC core reference |
| AVDD / DVDD / AGND / DGND | Analog/digital power domains | Separate 5-V analog and 1.65–5-V digital supplies minimize noise coupling; dedicated ground pins prevent return-path interference |
Key Features
| Feature | Design Value |
|---|---|
| Programmable input ranges | 9 software-selectable ranges (5 bipolar + 4 unipolar) eliminate external gain-switching components and simplify firmware calibration |
| Integrated 4.096-V reference | 7 ppm/°C max drift and 20-ms turn-on time enable fast wake-up from standby without external reference stabilization delays |
| MultiSPI™ interface | Dual SDO outputs support simultaneous readout in daisy-chain configurations, reducing host controller GPIO count and timing overhead |
| Input overvoltage protection | ±20 V tolerance (with AVDD = 5 V) allows direct connection to industrial field wiring without external TVS or clamping diodes |
| Constant input impedance | ≥1 MΩ across all ranges ensures consistent loading on sensors and signal sources, eliminating range-dependent gain errors |
Applications
| Analog Input Module | Semiconductor Test Equipment |
|---|---|
Use Scenario: High-channel-count PLC analog input card acquiring voltage/current from multiple field sensors in harsh factory environments. IC Role / Device Role / Timing Role: Primary ADC converting conditioned sensor signals into digital data for real-time control loop execution. Use Value: Single-supply operation and ±20 V OVP reduce external protection components; programmable ranges allow one BOM to serve multiple sensor types (4–20 mA, ±10 V, thermocouple). | Use Scenario: Automated test equipment measuring parametric performance of ICs under varying bias conditions. IC Role / Device Role / Timing Role: Precision digitizer capturing transient waveforms during device characterization sweeps. Use Value: 92 dB SNR and ±0.5 LSB INL ensure measurement repeatability; multiSPI™ daisy-chain mode enables synchronized sampling across multiple DUT channels. |
| Servo Drive Control Module | Industrial Motor Feedback Interface |
Use Scenario: Closed-loop position/speed controller using resolver or encoder feedback and current sensing in servo amplifiers. IC Role / Device Role / Timing Role: Simultaneous sampling of motor phase currents and position signals for FOC (field-oriented control) algorithms. Use Value: 500 kSPS throughput meets real-time PWM update requirements; –40°C to +125°C rating supports operation near power stages. | Use Scenario: Retrofit interface board converting legacy analog motor feedback (e.g., synchro, LVDT) to digital for modern motion controllers. IC Role / Device Role / Timing Role: High-accuracy front-end digitizing low-bandwidth but high-stability analog feedback signals. Use Value: On-chip 4.096-V reference and auto-calibrated gain/offset eliminate trimming potentiometers; constant 1-MΩ input impedance prevents loading of high-Z transducers. |
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 |
|---|---|---|---|
| ADS8681IPW | 1 MSPS sampling rate; identical pinout, reference, and interface; same 16-bit resolution and INL/SNR specs | Higher throughput required for wider bandwidth control loops or faster test sequencing | Select ADS8681IPW when system latency budget demands sub-1-µs conversion time and higher channel density per controller cycle |
| ADS8689IPW | 100 kSPS sampling rate; identical pinout, reference, and interface; same 16-bit resolution and INL/SNR specs | Lower power consumption (4 mA vs. 7.25 mA analog supply current) and relaxed timing margins for cost-sensitive embedded systems | Choose ADS8689IPW for battery-powered or thermally constrained applications where 100-kSPS suffices and standby current (2.8 mA) is critical |
Compared with ADS8681IPW and ADS8689IPW, the ADS8685IPW delivers optimal balance of speed (500 kSPS), power (5.6–7.25 mA), and thermal robustness for mid-tier industrial motion control and modular DAQ systems requiring deterministic sampling without overspec'ed throughput.
Availability
ADS8685IPW is available at Aetrix Electronics and suitable for analog input modules, semiconductor test equipment, and servo drive control modules requiring stable component supply across extended temperature and long production lifecycles.
Supply support for ADS8685IPW 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 ADS868x family was designed for high-reliability industrial data acquisition systems requiring software-configurable input scaling, integrated protection, and seamless SPI interoperability - targeting servo drives, PLCs, and automated test equipment.
FAQ
What input voltage ranges does the ADS8685IPW support?
The ADS8685IPW supports nine software-programmable input ranges: five bipolar (±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, ±2.56 V) and four unipolar (0–12.288 V, 0–10.24 V, 0–6.144 V, 0–5.12 V). Each range is calibrated for gain and offset error, and the input impedance remains ≥1 MΩ regardless of selection. This eliminates external signal conditioning for most industrial sensor interfaces.
Does the ADS8685IPW require an external reference voltage?
No, the ADS8685IPW includes an on-chip 4.096-V reference with ±7 ppm/°C maximum drift and 20-ms turn-on time. REFIO can be configured as output (default) or input, allowing use of the internal reference or an external precision source. When using the internal reference, a 10-μF capacitor on REFCAP is mandatory for ADC stability.
How does the multiSPI™ interface of the ADS8685IPW differ from standard SPI?
The ADS8685IPW multiSPI™ interface extends standard SPI with dual SDO outputs (SDO-0 and SDO-1), configurable clocking modes (asynchronous, source-synchronous external, or source-synchronous internal), and daisy-chain capability. SDO-1 doubles as ALARM output or general-purpose pin, enabling status reporting without consuming additional host GPIOs - a key advantage over basic SPI ADCs.
What is the operating temperature range of the ADS8685IPW?
The ADS8685IPW is rated for –40°C to +125°C free-air temperature, qualified per extended industrial specifications. This enables deployment in demanding environments such as motor drive cabinets, under-hood automotive ECUs, and factory-floor PLCs where ambient temperatures exceed commercial-grade limits.
Can the ADS8685IPW interface directly with ±20 V field signals?
Yes - the ADS8685IPW features integrated input overvoltage protection that withstands up to ±20 V on AIN_P/AIN_GND when AVDD = 5 V. This allows direct connection to industrial 0–10 V, ±10 V, or 4–20 mA loop-powered sensors without external clamping diodes or series resistors, simplifying front-end design and improving reliability.
ADS8685IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- ADS868x
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- PGA-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- 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:
- PGA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8685IPW FAQ
1.How can I place an order for ADS8685IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8685IPW 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 ADS8685IPW reliable?
The price and inventory of ADS8685IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8685IPW is usually 5 days.
3.What payment methods are accepted for ADS8685IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8685IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8685IPW?
ADS8685IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8685IPW 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 ADS8685IPW?
For technical support, including ADS8685IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8685IPW requirements.
6.How does Aetrix verify that ADS8685IPW is sourced from the original manufacturer or authorized distributors?
All ADS8685IPW 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 ADS8685IPW meets industry standards.
7.What is the process for return or replacement of ADS8685IPW?
All ADS8685IPW units undergo pre-shipment inspection (PSI). If there is an issue with ADS8685IPW, 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 ADS8685IPW part is unused and in its original packaging.
Return procedure for ADS8685IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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