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Texas Instruments ADS8509IBDWR
- Part No.:
- ADS8509IBDWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS8509IBDWR.pdf
- Description:
- IC ADC 16BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
ADS8509IBDWR 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, serial SPI-compatible interface, and ±2 LSB max INL. It operates from a single +5-V supply, supports ±10-V/0–5-V input ranges via external resistor networks, and targets precision data acquisition in industrial control and instrumentation.
For engineers reviewing the ADS8509IBDWR datasheet, ADS8509IBDWR pinout, ADS8509IBDWR application, or ADS8509IBDWR equivalent, key selection criteria include guaranteed 16-bit no-missing-codes performance over –40°C to 85°C, internal/external reference flexibility, daisy-chainable serial output with SYNC pulse, and SO-20 package compatibility with ADS7809 for legacy upgrades.
Technical Context
The ADS8509IBDWR implements a capacitor-based SAR architecture with on-chip CDAC, comparator, and clock generator. Its analog front-end uses precision external resistors (e.g., 10 kΩ, 4.9 kΩ, 4 kΩ) to configure bipolar/unipolar input ranges up to ±10 V, while the internal 2.5-V reference provides ±7 ppm/°C drift and supports buffered external reference injection at REF pin.
Digital interface operation is configurable via EXT/INT and SB/BTC pins: internal DATACLK mode outputs 16 synchronized pulses per conversion; external DATACLK mode enables synchronous read with SYNC pulse generation and TAG-based daisy-chaining. BUSY asserts low during conversion (2.2 ms), and R/C falling edge initiates sampling and conversion in CS-low condition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - guarantees monotonic transfer function and no missing codes across full temperature range. |
| Sampling Rate | 250 kSPS - fixed throughput enabling real-time capture of signals up to 500 kHz full-power bandwidth. |
| INL / DNL | ±2 LSB max / ±1 LSB max - ensures accurate representation of linear sensor outputs and control feedback loops. |
| Reference | Internal 2.5 V ±0.5% (±2 LSB FSR error) - eliminates need for external reference unless tighter drift (±2 ppm/°C) required. |
| Power Dissipation | 70 mW typ at 250 kSPS - enables high-density PCB layouts without forced cooling in industrial enclosures. |
| Input Voltage Range | Configurable ±10 V, ±5 V, ±3.33 V, 0–4 V, 0–5 V, 0–10 V - supports direct connection to industrial transducers and signal conditioning stages. |
| Package | SO-20 (DW) - surface-mount footprint compatible with automated assembly and pin-compatible upgrade path from ADS7809. |
Pinout & Package
ADS8509IBDWR is housed in a 20-pin SOIC (DW) package with 0.65 mm pitch, JEDEC MS-013 compliant, thermal resistance θJA = 46°C/W. Pin functions are validated per TI SLAS324C datasheet Figure 10 and Terminal Functions table.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 4 | R1IN / R2IN / R3IN | Analog inputs - accept differential or single-ended signals; configured with external resistors for gain/attenuation. |
| 2, 7 | AGND1 / AGND2 | Separate analog ground returns - minimize digital noise coupling into precision ADC core. |
| 5 | CAP | Reference buffer decoupling terminal - requires 2.2 µF tantalum capacitor to AGND2 for stability. |
| 6 | REF | Reference I/O - outputs internal 2.5 V or accepts external 2.3–2.7 V reference; bypassed externally. |
| 8 | SB/BTC | Data format select - high = straight binary, low = two's complement for signed measurement systems. |
| 9 | EXT/INT | Clock source select - low = internal DATACLK output, high = external DATACLK input for synchronous reads. |
| 10 | DGND | Digital ground - isolated return for logic circuitry to prevent ground bounce affecting analog accuracy. |
| 11 | SYNC | Synchronization pulse output - indicates valid data window during external clock read modes. |
| 12 | DATACLK | Serial clock I/O - bidirectional: output in internal mode, input in external mode; timing-critical for data integrity. |
| 13 | DATA | Serial data output - MSB-first, 16-bit stream; level follows TAG input when transmission begins. |
| 14 | TAG | Daisy-chain input - enables cascading multiple ADS8509 devices onto one serial bus using DATA-to-TAG routing. |
| 15 | R/C | Read/Convert control - falling edge starts conversion and (if EXT/INT low) triggers data transmission. |
| 16 | CS | Chip select - active-low enable; internally ORed with R/C to reduce control line count in system design. |
| 17 | BUSY | Status indicator - low during conversion (2.2 ms), high when result is latched and ready for read. |
| 18 | PWRD | Power-down input - high disables conversion and reduces current draw to 50 mW standby state. |
| 19 | VANA | Analog supply - +4.75 V to +5.25 V; must be ≥ VDIG and decoupled with 0.1 µF ceramic + 10 µF tantalum. |
| 20 | VDIG | Digital supply - +4.75 V to +5.25 V; tied directly to VANA in most designs to simplify power layout. |
Key Features
| Feature | Design Value |
|---|---|
| SPI-compatible serial interface | Enables direct connection to TI C2000, ARM Cortex-M, or FPGA SPI peripherals without protocol translation logic. |
| Daisy-chain capability via TAG/DATA | Reduces host GPIO count and PCB trace count when synchronizing multi-channel acquisition across multiple ADS8509 units. |
| SYNC pulse generation | Provides deterministic timing anchor for external processors to latch 16-bit data without race conditions in discontinuous clock mode. |
| Configurable input ranges | Supports ±10 V industrial sensors and 0–5 V microcontroller-level signals using same device, minimizing BOM variants. |
| Single 5-V supply operation | Eliminates need for dual ±12 V rails or isolated DC/DC converters, simplifying power architecture in space-constrained modules. |
| Industrial temperature range | Specified from –40°C to +85°C with full 16-bit performance, enabling deployment in factory-floor PLCs and outdoor instrumentation. |
Applications
| Industrial Process Control | Data Acquisition Systems |
|---|---|
|
Use Scenario: Monitoring pressure, temperature, and flow transducers in distributed control systems (DCS) with 4–20 mA loop interfaces. IC Role / Device Role / Timing Role: Precision front-end ADC converting conditioned analog sensor outputs into 16-bit digital values synchronized to PLC scan cycle. Use Value: ±2 LSB INL ensures sub-0.003% measurement accuracy across 16-bit span, critical for closed-loop PID control stability. |
Use Scenario: High-fidelity waveform capture in portable test equipment for vibration analysis and power quality monitoring. IC Role / Device Role / Timing Role: Sampling engine acquiring 250 kSPS streams from anti-aliased analog filters before FFT processing. Use Value: 88 dB SINAD and 99 dB SFDR at 20 kHz enable resolution of low-amplitude harmonics buried in noise floor. |
| Digital Signal Processing | Medical Equipment |
|
Use Scenario: Real-time signal conditioning in ultrasound beamforming modules requiring low-latency, deterministic sampling. IC Role / Device Role / Timing Role: Synchronous ADC feeding FPGA-based digital downconverters with precise 2.2-ms conversion time and BUSY-driven handshaking. Use Value: Internal DATACLK mode eliminates external clock jitter sensitivity, preserving SNR in time-critical DSP pipelines. |
Use Scenario: Patient vital sign monitoring in bedside analyzers capturing ECG, respiration, and SpO₂ waveforms. IC Role / Device Role / Timing Role: Low-power, medically certified ADC digitizing biopotential signals with galvanically isolated analog front-end. Use Value: 70 mW typical dissipation and PWRD pin support battery-operated designs meeting IEC 60601-1 leakage current limits. |
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 |
|---|---|---|---|
| ADS8515IBDBR | 20-bit resolution, 250 kSPS, SSOP-28, internal reference ±4 ppm/°C, 100 mW power | Higher resolution for metrology-grade instruments; larger package and higher power limit use in compact portable devices | Select ADS8515IBDBR only when >16-bit ENOB is required and board area allows SSOP-28; not drop-in compatible with SO-20 layout |
| AD7606BSTZ | 16-bit, 200 kSPS, parallel + serial interface, ±10 V input, on-chip PGA, 100 mW | Integrated programmable gain amplifier simplifies front-end design but adds latency; parallel interface increases pin count | Choose AD7606BSTZ for systems needing variable gain without external op-amps; requires PCB redesign due to LQFP-64 footprint |
Compared with ADS8509IBDWR, ADS8515IBDBR delivers enhanced resolution at the cost of higher power and larger package, while AD7606BSTZ offers integrated signal conditioning but sacrifices layout compatibility and adds interface complexity-neither is pin- or software-compatible, requiring full schematic and firmware revision.
Availability
ADS8509IBDWR is available at Aetrix Electronics and suitable for industrial process control, data acquisition systems, and medical equipment requiring stable component supply with guaranteed long-term availability and full industrial temperature range certification.
Supply support for ADS8509IBDWR 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 IC design.
The ADS8509 belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-power, single-supply data acquisition in harsh industrial environments where reliability and parametric consistency are critical.
FAQ
What is the maximum input voltage the ADS8509IBDWR can tolerate on its analog inputs?
The ADS8509IBDWR analog inputs (R1IN, R2IN, R3IN) have an absolute maximum rating of ±25 V per the datasheet Absolute Maximum Ratings table. However, for normal operation within specified performance, input voltage must remain within the configured range (e.g., ±10 V) plus 20% margin - so ±12 V maximum for a ±10-V range setup. Exceeding this risks degraded INL/DNL or permanent damage.
Does the ADS8509IBDWR require external resistors to set input range, and if so, what values are specified?
Yes, the ADS8509IBDWR requires external precision resistors to configure input ranges. The datasheet specifies 10 kΩ, 4.9 kΩ, and 4 kΩ for ±10-V operation (Figure 29), and 2.5 kΩ and 9.8 kΩ for other ranges (Figure 30). These 0.1% tolerance, 0.25-W fixed resistors establish gain/attenuation and common-mode rejection; omitting them results in undefined input scaling.
How does the PWRD pin affect operation of the ADS8509IBDWR, and what is its power-saving impact?
When PWRD is driven high, the ADS8509IBDWR inhibits conversions and enters low-power standby mode, reducing typical power dissipation from 70 mW to 50 mW. Conversion results from the last completed cycle remain latched in the output shift register, allowing readout without re-sampling. This feature supports duty-cycled acquisition in battery-powered or thermally constrained systems.
Can the ADS8509IBDWR interface directly with an FPGA SPI peripheral, and what configuration is required?
Yes, the ADS8509IBDWR supports SPI-compatible serial communication. To interface with an FPGA SPI master, configure EXT/INT = low (internal DATACLK), SB/BTC = high (straight binary), and tie CS low. The FPGA samples DATA on DATACLK rising/falling edges (16 cycles), using BUSY to detect conversion completion. No SPI mode bits (CPOL/CPHA) are needed since timing is master-controlled by the ADC.
What is the purpose of the CAP pin on the ADS8509IBDWR, and what capacitor value is required?
The CAP pin on the ADS8509IBDWR connects to the internal reference buffer output and must be decoupled to AGND2 with a 2.2 µF tantalum capacitor, as specified in the Terminal Functions table and Figure 29. This capacitor stabilizes the reference voltage during conversion, preventing oscillation and ensuring ±2 LSB INL performance; ceramic or aluminum electrolytic types are not recommended due to ESR and aging characteristics.
ADS8509IBDWR 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:
- -
ADS8509IBDWR FAQ
1.How can I place an order for ADS8509IBDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8509IBDWR 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 ADS8509IBDWR reliable?
The price and inventory of ADS8509IBDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8509IBDWR is usually 5 days.
3.What payment methods are accepted for ADS8509IBDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8509IBDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8509IBDWR?
ADS8509IBDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8509IBDWR 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 ADS8509IBDWR?
For technical support, including ADS8509IBDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8509IBDWR requirements.
6.How does Aetrix verify that ADS8509IBDWR is sourced from the original manufacturer or authorized distributors?
All ADS8509IBDWR 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 ADS8509IBDWR meets industry standards.
7.What is the process for return or replacement of ADS8509IBDWR?
All ADS8509IBDWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8509IBDWR, 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 ADS8509IBDWR part is unused and in its original packaging.
Return procedure for ADS8509IBDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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