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Texas Instruments ADS8509IDWR
- Part No.:
- ADS8509IDWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS8509IDWR.pdf
- Description:
- IC ADC 16BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADS8509IDWR from Texas Instruments is a 16-bit, 250-kSPS successive approximation register (SAR) analog-to-digital converter with integrated sample-and-hold, internal 2.5-V reference, SPI-compatible serial interface, and single 5-V supply operation. It supports ±10 V, 0 V to 5 V, and other configurable input ranges via external resistor networks, and delivers ±2 LSB max INL and ±1 LSB max DNL over –40°C to 85°C for industrial data acquisition systems.
For engineers reviewing the ADS8509IDWR datasheet, ADS8509IDWR pinout, ADS8509IDWR application, or ADS8509IDWR equivalent, this device is selected for high-precision, low-power, serial-output ADC applications requiring guaranteed 16-bit no-missing-codes performance, flexible reference options (internal or external), and daisy-chainable SPI output with SYNC pulse support for multi-channel synchronization.
Technical Context
The ADS8509IDWR implements a capacitor-based SAR architecture with fully differential input stage, precision internal voltage reference (2.48–2.52 V), and programmable data format (straight binary or two's complement). Its conversion cycle comprises 1.8-ms acquisition and 2.2-ms conversion, achieving full 4-ms throughput at 250 kSPS.
It features dual clocking modes: internal DATACLK output (9 MHz, 16-pulse burst per conversion) or external DATACLK input (0.1–26 MHz), with EXT/INT pin selection. The BUSY signal indicates active conversion, while SYNC provides timing alignment for multi-device readout in external-clock mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonic transfer function and no missing codes across full temperature range. |
| Sampling Rate | 250 kSPS - fixed maximum throughput; cycle time = 4 ms (1.8 ms acquisition + 2.2 ms conversion). |
| INL / DNL | ±2 LSB / ±1 LSB max - ensures linearity compliance for precision measurement applications like process control. |
| Reference | Internal 2.5-V ±0.5% (±8 ppm/°C drift) or external 2.3–2.7 V - enables system-level calibration flexibility and reduced BOM count. |
| Power Dissipation | 70 mW typ at 250 kSPS - supports thermally constrained industrial designs without forced cooling. |
| Input Ranges | ±10 V, ±5 V, ±3.33 V, 0–4 V, 0–5 V, 0–10 V - selectable via external resistor networks per Figure 29/30. |
| Serial Interface | SPI-compatible, MSB-first, 16-bit frame with TAG daisy-chain support - simplifies multi-ADC synchronization in DSP-connected systems. |
Pinout & Package
ADS8509IDWR is packaged in a 20-pin SOIC (DW package), RoHS-compliant, with 0.65-mm lead pitch and exposed pad not present. Pin functions are validated per TI SLAS324C Rev. April 2010.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN, R2IN, R3IN | Analog input terminals | Three independent inputs supporting bipolar/unipolar configurations; each rated for ±25 V absolute max. |
| REF | Reference I/O | Outputs internal 2.5-V reference or accepts external 2.3–2.7 V reference; requires 2.2-μF tantalum bypass to AGND2. |
| CAP | Reference buffer capacitor terminal | Connects to 2.2-μF tantalum capacitor to AGND2; critical for reference stability and noise rejection. |
| CS, R/C | Digital control inputs | CS (chip select) and R/C (read/convert) are internally ORed; falling edge on second signal initiates conversion. |
| BUSY | Status output | Active-low open-drain signal indicating conversion in progress; falls at start, rises after data latched. |
| DATA, DATACLK | Serial interface I/O | DATA outputs 16-bit result MSB-first; DATACLK is bidirectional - output in internal mode, input in external mode. |
| EXT/INT | Interface mode select | Low = internal DATACLK generation; high = external DATACLK synchronization - determines clock source and timing behavior. |
| PWRD | Power-down control | High = power-down mode (50 mW); low = active (70 mW typ); preserves previous conversion result in shift register. |
| AGND1, AGND2, DGND | Ground terminals | Separate analog/digital grounds minimize noise coupling; AGND1 is internal reference ground, AGND2 references CAP/REF. |
| VDIG, VANA | Supply inputs | Both require +4.75 V to +5.25 V; VDIG must be ≤ VANA - decoupling: 0.1-μF ceramic + 10-μF tantalum per supply. |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit no-missing-codes guarantee | Ensures deterministic digital output across full scale and temperature range - eliminates interpolation or correction firmware. |
| Internal 2.5-V reference with ±0.5% accuracy | Reduces external component count and layout complexity while maintaining ±2 LSB INL over –40°C to 85°C. |
| SPI-compatible serial output with SYNC pulse | Enables deterministic multi-ADC synchronization in external-clock mode - critical for phase-coherent sampling in DAQ systems. |
| Daisy-chainable TAG interface | Allows cascading of multiple ADS8509 devices on a single serial bus - reduces processor GPIO count and PCB routing density. |
| Flexible input range configuration | Supports ±10 V, ±5 V, 0–5 V, etc., using factory-calibrated external resistors - adapts to sensor output levels without redesign. |
Applications
| Industrial Process Control | Data Acquisition Systems |
|---|---|
|
Use Scenario: Monitoring temperature, pressure, and flow sensors in PLC-based control cabinets with 4–20 mA or ±10 V outputs. IC Role / Device Role / Timing Role: Primary 16-bit ADC digitizing analog field signals; synchronized via SYNC pulse across multiple channels for coordinated sampling. Use Value: ±2 LSB INL ensures <0.003% full-scale error in closed-loop control, directly improving setpoint accuracy and reducing actuator wear. |
Use Scenario: Modular rack-mounted DAQ units acquiring simultaneous voltage waveforms from vibration, strain, and acoustic sensors. IC Role / Device Role / Timing Role: Channel-isolated SAR ADC with daisy-chainable TAG output; configured for ±10 V range and external clock sync. Use Value: 250-kSPS throughput and 83-dB SINAD enable 20-kHz bandwidth capture with <0.01% THD - sufficient for Class I vibration analysis per ISO 10816. |
| Digital Signal Processing Interfaces | Medical Equipment Signal Conditioning |
|
Use Scenario: Front-end digitization for FPGA- or DSP-based real-time filtering, FFT, or spectral analysis in test equipment. IC Role / Device Role / Timing Role: SPI-connected ADC feeding data directly into Xilinx Zynq or TI C6000 DSP; uses internal DATACLK for deterministic latency. Use Value: 4-ms fixed cycle time and pipeline-free architecture eliminate jitter-induced timing uncertainty - essential for coherent averaging and phase-sensitive detection. |
Use Scenario: Biopotential acquisition in patient monitors measuring ECG, EEG, or EMG with high common-mode rejection requirements. IC Role / Device Role / Timing Role: Precision ADC in isolated front-end stage; configured for ±5 V range with external reference for traceable calibration. Use Value: ±1 LSB DNL prevents code-width distortion in low-amplitude bio-signals; 88-dB SNR supports >13.5 ENOB for microvolt-level resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8515IPW | 20-bit resolution, 250-kSPS, internal reference only (4.096 V), 28-pin TSSOP; higher power (100 mW) | Targeted at ultra-high-precision metrology where 16-bit is insufficient; lacks external reference option and TAG daisy-chain | Select ADS8515IPW only when >16-bit resolution is mandatory and system can accommodate higher power and no external ref flexibility. |
| AD7606BSTZ | 8-channel, simultaneous-sampling 16-bit SAR, ±10 V input, internal ref (2.5 V), SPI interface, 64-pin LQFP; 100-mW typical | Integrated multi-channel solution with on-chip PGA and anti-alias filter - replaces discrete channel-per-ADC architecture | Choose AD7606BSTZ for new multi-channel designs where board space, cost, and channel matching outweigh need for individual ADC configurability. |
Compared with ADS8509IDWR, ADS8515IPW trades configurability for resolution and AD7606BSTZ replaces discrete channel design with integrated multi-input architecture - neither offers identical pin compatibility or the same balance of single-channel flexibility, low power, and reference versatility.
Availability
ADS8509IDWR is available at Aetrix Electronics and suitable for industrial process control, medical signal conditioning, and digital signal processing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS8509IDWR 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, embedded processing, and high-reliability ICs for industrial, automotive, and communications markets.
The ADS8509 is part of TI's precision data converter portfolio, designed specifically for high-accuracy, low-power, serial-output applications in harsh industrial environments where 16-bit integrity and thermal stability are non-negotiable.
FAQ
What is the maximum sampling rate of the ADS8509IDWR?
The ADS8509IDWR operates at a fixed maximum sampling rate of 250 kSPS, corresponding to a 4-ms conversion cycle (1.8-ms acquisition + 2.2-ms conversion). This rate is guaranteed over the full –40°C to 85°C industrial temperature range and does not vary with supply voltage or reference choice. The ADS8509IDWR achieves this performance using a capacitor-based SAR architecture with integrated sample-and-hold and internal clocking.
Does the ADS8509IDWR support external reference voltage?
Yes, the ADS8509IDWR supports external reference voltages from 2.3 V to 2.7 V applied to the REF pin. When using an external reference, full-scale error remains within ±0.5% FSR, and drift is reduced to ±2 ppm/°C - tighter than the internal reference's ±8 ppm/°C. The device retains all specified AC performance (e.g., 83-dB SINAD) under external reference conditions, as verified in TI SLAS324C Section 6.4.
How does the TAG feature work on the ADS8509IDWR?
The TAG feature on the ADS8509IDWR enables daisy-chaining of multiple converters on a single serial bus: the DATA output of one ADS8509IDWR connects to the TAG input of the next. In external-clock mode, data shifts through the chain synchronously to DATACLK, allowing a single processor to read all devices sequentially. This eliminates additional SPI chip-select lines and simplifies multi-channel PCB routing - confirmed in TI Application Report SBAA162.
What is the purpose of the CAP pin on the ADS8509IDWR?
The CAP pin on the ADS8509IDWR connects to a 2.2-μF tantalum capacitor tied to AGND2 and serves as the stabilization node for the internal reference buffer. This capacitor suppresses high-frequency noise and transient currents induced by the SAR capacitor array switching, ensuring reference stability during conversion. Omitting or undersizing this capacitor degrades INL and increases reference drift - TI specifies 2.2 μF minimum with ≤1 Ω ESR in SLAS324C Section 8.2.2.
Can the ADS8509IDWR operate with separate analog and digital supplies?
Yes, the ADS8509IDWR has independent VANA (analog supply) and VDIG (digital supply) pins, both rated for +4.75 V to +5.25 V. Crucially, VDIG must be ≤ VANA to prevent latch-up. Separate decoupling is required: 0.1-μF ceramic + 10-μF tantalum per supply, placed near respective pins. This separation minimizes digital switching noise coupling into the analog path - a key factor enabling its ±2 LSB INL specification.
ADS8509IDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8509IDWR FAQ
1.How can I place an order for ADS8509IDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8509IDWR 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 ADS8509IDWR reliable?
The price and inventory of ADS8509IDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8509IDWR is usually 5 days.
3.What payment methods are accepted for ADS8509IDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8509IDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8509IDWR?
ADS8509IDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8509IDWR 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 ADS8509IDWR?
For technical support, including ADS8509IDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8509IDWR requirements.
6.How does Aetrix verify that ADS8509IDWR is sourced from the original manufacturer or authorized distributors?
All ADS8509IDWR 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 ADS8509IDWR meets industry standards.
7.What is the process for return or replacement of ADS8509IDWR?
All ADS8509IDWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8509IDWR, 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 ADS8509IDWR part is unused and in its original packaging.
Return procedure for ADS8509IDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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