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Texas Instruments ADS8509IBDWRG4
- Part No.:
- ADS8509IBDWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS8509IBDWRG4.pdf
- Description:
- IC ADC 16BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,705
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Product details
Overview
ADS8509IBDWRG4 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, delivers ±2 LSB max INL and ±1 LSB max DNL, and targets precision data acquisition in industrial control systems.
For engineers reviewing the ADS8509IBDWRG4 datasheet, ADS8509IBDWRG4 pinout, ADS8509IBDWRG4 application, or ADS8509IBDWRG4 equivalent, key selection considerations include its 250-kHz throughput, internal/external reference flexibility, daisy-chain-capable serial output with SYNC pulse, and SO-20 package compatibility with ADS7809 for legacy system upgrades.
Technical Context
The ADS8509IBDWRG4 implements a capacitor-based SAR architecture with on-chip CDAC, comparator, and clock generator. Its analog front-end uses three dedicated input terminals (R1IN, R2IN, R3IN) configured via external resistors to support bipolar (±10 V) and unipolar (0–5 V) ranges, while CAP and REF pins interface with a 2.2-µF tantalum bypass capacitor and optional external reference.
Digital control relies on asynchronous CS/R/C logic with BUSY status signaling, programmable EXT/INT clock source selection, SB/BTC format control (straight binary or 2's complement), and TAG-enabled daisy-chaining. Conversion timing is fixed at 4 µs cycle time (2.2 µs conversion + 1.8 µs acquisition), with pipeline delay ensuring output data corresponds to the prior completed conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonicity and no missing codes across full temperature range. |
| Sampling Rate | 250 kSPS - enables real-time capture of signals up to 125 kHz per Nyquist criterion. |
| INL / DNL | ±2 LSB / ±1 LSB max - ensures high code accuracy for measurement-critical applications like process control. |
| Reference | Internal 2.5 V ±0.5% (2.48–2.52 V) - eliminates need for external reference unless higher stability (±2 ppm/°C drift) is required. |
| Power Dissipation | 70 mW typ at 250 kSPS - supports low-thermal-impact deployment in dense PCB layouts. |
| Analog Input Range | Configurable ±10 V, ±5 V, ±3.33 V, 0–4 V, 0–5 V, 0–10 V - achieved via precision external resistor networks (e.g., 10 kΩ/4.9 kΩ/4 kΩ). |
| Digital Interface | SPI-compatible 16-bit serial output with selectable internal/external DATACLK and SYNC pulse - simplifies integration with DSPs and microcontrollers. |
Pinout & Package
ADS8509IBDWRG4 is housed in a 20-pin SOIC (SO-20, DW package) with 0.3-inch body width and standard JEDEC outline. Pin 1 is marked by a beveled corner; thermal resistance θJA = 46°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (R1IN) | Analog input channel A | Primary differential input terminal; used with R2IN/R3IN and external resistors to configure full-scale range. |
| 3 (R2IN) | Analog input channel B | Secondary input for range-setting network; forms precision voltage divider with R1IN and R3IN. |
| 4 (R3IN) | Analog input channel C | Third input node enabling flexible bipolar/unipolar scaling; referenced to AGND1/AGND2. |
| 5 (CAP) | Reference buffer capacitor terminal | Requires 2.2-µF tantalum capacitor to AGND2 for stable internal reference operation. |
| 6 (REF) | Reference I/O | Outputs internal 2.5-V reference or accepts external 2.3–2.7-V reference; must be bypassed. |
| 8 (SB/BTC) | Data format select | High = straight binary; low = two's complement - determines interpretation of MSB in host firmware. |
| 9 (EXT/INT) | Clock source select | Low = internal DATACLK generation; high = external clock synchronization - affects timing constraints. |
| 11 (SYNC) | Output synchronization pulse | Asserted once per read command in external clock mode; enables deterministic multi-device sampling alignment. |
| 12 (DATACLK) | Data clock I/O | Input when EXT/INT = high; output when EXT/INT = low - controls serial bit timing and avoids metastability. |
| 13 (DATA) | Serial data output | MSB-first 16-bit stream; level held at TAG state between conversions - supports daisy-chain topology. |
| 14 (TAG) | Daisy-chain input | Drives DATA of upstream device in cascaded configuration; sampled at read initiation to set idle bus state. |
| 15 (R/C) | Read/convert control | Falling edge initiates conversion and/or read; function depends on CS and EXT/INT states - enables flexible sequencing. |
| 16 (CS) | Chip select | Active-low enable; internally ORed with R/C - allows simplified control by tying CS low permanently. |
| 17 (BUSY) | Conversion status indicator | Active-low open-drain signal; falls at conversion start, rises after data latching - provides hardware handshaking. |
| 18 (PWRD) | Power-down control | High = deep sleep (50 mW); low = active (70 mW) - enables dynamic power management in battery systems. |
| 19 (VDIG) | Digital supply | +4.75 V to +5.25 V; must be ≤ VANA - decoupled with 0.1-µF ceramic + 10-µF tantalum capacitors. |
| 20 (VANA) | Analog supply | +4.75 V to +5.25 V; powers analog core and reference - requires separate low-noise regulation path. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Operates from one +5-V rail (VDIG = VANA = 5 V), eliminating dual-rail design complexity and reducing BOM count. |
| Configurable input ranges | Supports ±10 V, ±5 V, ±3.33 V, 0–4 V, 0–5 V, and 0–10 V via external resistor networks - enables reuse across multiple sensor types. |
| SYNC pulse generation | Provides deterministic timing marker for multi-channel synchronized sampling - critical for phase-coherent measurements. |
| Daisy-chain capability | Uses TAG/DATA interconnection to cascade multiple ADS8509 devices on one serial bus - reduces MCU GPIO and PCB routing overhead. |
| Industrial temperature range | Specified from –40°C to +85°C with guaranteed performance - suitable for factory-floor and outdoor equipment deployments. |
Applications
| Industrial Process Control | Data Acquisition Systems |
|---|---|
|
Use Scenario: Monitoring pressure, temperature, and flow sensors in PLC-based automation systems with 0–10 V or 4–20 mA transmitters. IC Role / Device Role / Timing Role: Primary ADC converting conditioned analog sensor outputs into 16-bit digital values for real-time PID loop execution. Use Value: ±2 LSB INL ensures <0.003% full-scale error over temperature, meeting SIL-2 functional safety margin requirements for closed-loop control. |
Use Scenario: High-fidelity waveform capture in portable test equipment sampling vibration, audio, or ECG signals at 250 kSPS. IC Role / Device Role / Timing Role: Precision sampling front-end with internal reference and low aperture jitter (5 ns) for accurate time-domain analysis. Use Value: 88 dB SINAD and 99 dB SFDR at 20 kHz enable >14 ENOB resolution, supporting Class I medical-grade diagnostics. |
| Digital Signal Processing | Instrumentation |
|
Use Scenario: Feeding real-time sensor data to TI C6000 DSPs for spectral analysis, filtering, or motor control algorithms. IC Role / Device Role / Timing Role: SPI-compatible serial ADC with SYNC pulse and daisy-chain support for multi-channel parallel sampling into DSP McBSP interfaces. Use Value: Internal DATACLK eliminates external clock distribution skew; SYNC aligns sample edges across channels for coherent FFT binning. |
Use Scenario: Benchtop multimeters and oscilloscopes requiring calibrated DC accuracy and low noise across multiple input ranges. IC Role / Device Role / Timing Role: Metrology-grade ADC with ±1 LSB DNL, factory-calibrated full-scale error (<±0.5% FSR), and low drift (±7 ppm/°C). Use Value: Internal 2.5-V reference with 8 ppm/°C drift and external reference option (±2 ppm/°C) supports traceable calibration without external ICs. |
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 |
|---|---|---|---|
| ADS8505IPW | 16-bit, 1.25-MSPS, 24-pin TSSOP; higher speed but requires external reference and 3.3-V digital interface. | Targets high-throughput systems where 250-kSPS is insufficient; not pin-compatible with ADS8509IBDWRG4. | Select when sampling rate >500 kSPS is required and board layout allows new footprint and voltage translation. |
| ADS7809U | 16-bit, 10-kSPS, 28-pin SOIC; lower speed, no internal reference, no SYNC or TAG features. | Legacy replacement only; lacks daisy-chain, SYNC, and internal reference - increases system component count. | Choose only for cost-sensitive, low-speed retrofits where existing ADS7809 PCBs cannot be modified. |
Compared with ADS8505IPW and ADS7809U, ADS8509IBDWRG4 uniquely balances 250-kSPS throughput, integrated reference, SYNC-aligned multi-device operation, and SO-20 footprint - making it optimal for industrial DAQ upgrades requiring minimal layout change and enhanced timing control.
Availability
ADS8509IBDWRG4 is available at Aetrix Electronics and suitable for industrial process control, portable data loggers, and embedded DSP interfaces requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.
Supply support for ADS8509IBDWRG4 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 connectivity technologies, with decades of expertise in precision data converters and industrial-grade IC design.
The ADS8509IBDWRG4 belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-power, and easy-to-integrate data acquisition in harsh industrial environments - emphasizing configurability, timing determinism, and single-supply simplicity.
FAQ
What input voltage ranges does the ADS8509IBDWRG4 support?
The ADS8509IBDWRG4 supports ±10 V, ±5 V, ±3.33 V, 0–4 V, 0–5 V, and 0–10 V input ranges through external resistor networks connected to R1IN, R2IN, and R3IN. Configuration requires precision resistors (e.g., 10 kΩ, 4.9 kΩ, 4 kΩ) as specified in TI's SLAS324C datasheet Figure 29. The internal 2.5-V reference enables accurate scaling without external reference ICs.
How does the SYNC pin function in the ADS8509IBDWRG4?
The SYNC pin on the ADS8509IBDWRG4 outputs a single-pulse synchronization signal during external clock mode when at least one rising edge of DATACLK occurs while not in read state. This pulse marks the start of data transmission, enabling precise alignment of sampling across multiple ADS8509IBDWRG4 devices in daisy-chain configurations - critical for phase-coherent multi-channel acquisition.
Can the ADS8509IBDWRG4 operate with an external reference, and what are the requirements?
Yes, the ADS8509IBDWRG4 accepts an external reference between 2.3 V and 2.7 V applied to the REF pin. When using external reference, full-scale error drift improves to ±2 ppm/°C (vs. ±7 ppm/°C with internal reference), and full-scale error remains within ±0.5% FSR. The external reference must be low-noise and capable of sourcing/sinking up to 100 µA as specified in the electrical characteristics table.
What is the purpose of the TAG pin on the ADS8509IBDWRG4?
The TAG pin on the ADS8509IBDWRG4 serves as the daisy-chain input for cascading multiple converters. In a chain, the DATA output of one ADS8509IBDWRG4 drives the TAG input of the next. During serial readout, data shifts through all devices synchronously to a single MCU input, reducing GPIO usage and PCB routing complexity - especially valuable in multi-sensor industrial nodes.
Is the ADS8509IBDWRG4 pin-compatible with the ADS7809?
Yes, the ADS8509IBDWRG4 is pin-compatible with the ADS7809 in the SO-20 package (DW), sharing identical pinout, footprint, and basic control signals (CS, R/C, BUSY, DATA, DATACLK). However, ADS8509IBDWRG4 adds EXT/INT, SYNC, TAG, SB/BTC, and PWRD pins - these must be tied off (e.g., EXT/INT to GND, TAG to VDIG) for drop-in replacement in legacy ADS7809 designs.
ADS8509IBDWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
ADS8509IBDWRG4 FAQ
1.How can I place an order for ADS8509IBDWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8509IBDWRG4 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 ADS8509IBDWRG4 reliable?
The price and inventory of ADS8509IBDWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8509IBDWRG4 is usually 5 days.
3.What payment methods are accepted for ADS8509IBDWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8509IBDWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8509IBDWRG4?
ADS8509IBDWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8509IBDWRG4 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 ADS8509IBDWRG4?
For technical support, including ADS8509IBDWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8509IBDWRG4 requirements.
6.How does Aetrix verify that ADS8509IBDWRG4 is sourced from the original manufacturer or authorized distributors?
All ADS8509IBDWRG4 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 ADS8509IBDWRG4 meets industry standards.
7.What is the process for return or replacement of ADS8509IBDWRG4?
All ADS8509IBDWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS8509IBDWRG4, 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 ADS8509IBDWRG4 part is unused and in its original packaging.
Return procedure for ADS8509IBDWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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