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Texas Instruments ADS8509IBDBR
- Part No.:
- ADS8509IBDBR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS8509IBDBR.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,341
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Product details
Overview
ADS8509IBDBR 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 ±2 LSB max INL. It operates from a single +5-V supply, supports ±10-V and 0–5-V input ranges via external resistor networks, and targets precision data acquisition in industrial control and instrumentation.
For engineers reviewing the ADS8509IBDBR datasheet, ADS8509IBDBR pinout, ADS8509IBDBR application, or ADS8509IBDBR equivalent, this page delivers verified electrical specs, SSOP-28 package mapping, timing-critical interface behavior (EXT/INT, R/C, DATACLK), and real-world substitution guidance - all grounded in TI's SLAS324C revision April 2010 specification.
Technical Context
The ADS8509IBDBR implements a capacitor-based SAR architecture with internal clocking for conversion cycles of 4 µs (250 kSPS), aperture delay of 5 ns, and full-power bandwidth of 500 kHz. Its dual-mode serial interface supports either internally generated DATACLK (9 MHz output) or externally synchronized operation up to 26 MHz, with configurable straight-binary or two's-complement output format via SB/BTC.
It integrates a buffered 2.5-V internal reference (±2 LSB INL, 8 ppm/°C drift) usable with external 2.3–2.7-V references, and features three analog inputs (R1IN/R2IN/R3IN) supporting programmable bipolar/unipolar ranges via external resistors. Power-down mode reduces dissipation to 50 mW while retaining previous conversion data in the shift register.
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 - fixed throughput enabling deterministic timing for real-time control loops. |
| INL / DNL | ±2 LSB / ±1 LSB max - ensures <0.003% linearity error in ±10-V range (1 LSB = 305 µV). |
| Reference | Internal 2.5 V ±0.02 V (8 ppm/°C drift) - eliminates external reference component but requires 2.2-µF tantalum bypass on CAP pin. |
| Supply | Single 5-V supply (4.75–5.25 V) - simplifies power design; VDIG ≤ VANA enforced. |
| Power Dissipation | 70 mW typ at 250 kSPS - enables low-thermal-load deployment in dense PCB layouts. |
| Input Range Support | ±10 V, ±5 V, ±3.33 V, 0–4 V, 0–5 V, 0–10 V - configured via external precision resistors per Figure 29/30. |
Pinout & Package
ADS8509IBDBR is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, JEDEC MO-153 compliant, thermal resistance θJA = 62°C/W. Pin 1 is located at bottom-left corner when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN, R2IN, R3IN | Analog input terminals | Accept differential or single-ended signals; configuration determines input range (e.g., R1IN–R2IN = ±10 V with 10 kΩ/4.9 kΩ network). |
| REF | Reference I/O | Outputs internal 2.5-V reference or accepts external 2.3–2.7-V source; must be bypassed with 2.2-µF tantalum to AGND2. |
| CAP | Reference buffer capacitor node | Requires 2.2-µF tantalum capacitor to AGND2; critical for reference stability and INL performance. |
| CS, R/C, EXT/INT | Digital control inputs | CS + R/C falling-edge triggers conversion; EXT/INT selects internal/external DATACLK mode - defines timing sovereignty. |
| BUSY, DATA, DATACLK, SYNC | Serial interface outputs | BUSY indicates active conversion; DATA shifts 16-bit result MSB-first; DATACLK is I/O; SYNC provides read synchronization in external-clock mode. |
| PWRD | Power-down control | High = inhibit conversions, reduce power to 50 mW; retains last conversion result in output register. |
| AGND1, AGND2, DGND | Ground terminals | AGND1 (pin 2) = internal analog ground reference; AGND2 (pin 9) = reference capacitor ground; DGND (pin 14) = digital return - must be separated and joined at single point. |
Key Features
| Feature | Design Value |
|---|---|
| SPI-compatible daisy-chain interface | Enables multi-channel acquisition using TAG pin to cascade up to N devices on one serial bus without additional GPIOs. |
| Configurable data format | SB/BTC pin selects straight binary (unipolar) or two's complement (bipolar) - eliminates post-processing for signed math in DSP systems. |
| Flexible clocking modes | Internal DATACLK (9 MHz) avoids external clock routing; external mode supports up to 26 MHz for high-speed readout - both modes guarantee data integrity via BUSY handshake. |
| Industrial temperature range | Specified from –40°C to +85°C with derated operation to –55°C/+125°C - suitable for factory-floor PLCs and outdoor instrumentation enclosures. |
| Low-noise analog front-end | 83 dB SINAD and 90 dB SFDR at 20 kHz input - meets requirements for high-fidelity sensor digitization in medical and test equipment. |
Applications
| Industrial Process Control | Data Acquisition Systems |
|---|---|
|
Use Scenario: Monitoring pressure, temperature, and flow sensors in distributed control systems (DCS) with 4–20 mA loop integration. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs at 250 kSPS with deterministic latency (<4 µs cycle time) for closed-loop PID execution. Use Value: ±2 LSB INL ensures <0.003% measurement accuracy over full industrial temperature range, reducing calibration frequency in field-deployed units. |
Use Scenario: Modular DAQ chassis acquiring synchronized multi-channel voltage/current waveforms for power quality analysis. IC Role / Device Role / Timing Role: Channel-specific SAR ADC with daisy-chain capability (TAG pin) enabling 16+ channel expansion without bus contention. Use Value: Internal 2.5-V reference and ±10-V input support eliminate external reference ICs and level-shifting circuitry, cutting BOM cost by ~$1.20 per channel. |
| Digital Signal Processing | Medical Equipment |
|
Use Scenario: Front-end digitization for real-time FFT-based vibration analysis in predictive maintenance edge nodes. IC Role / Device Role / Timing Role: High-SFDR (90 dB) ADC feeding TI C6000 DSP via SPI; external DATACLK mode synchronizes sampling to processing clock domain. Use Value: 500 kHz full-power bandwidth and 83 dB SNR preserve signal fidelity up to Nyquist (125 kHz), enabling accurate harmonic detection in rotating machinery. |
Use Scenario: Patient vital sign monitoring (ECG, EEG) requiring low-noise, low-drift analog capture in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision ADC converting conditioned biopotential signals with bipolar zero error <±5 mV and drift <±0.4 ppm/°C. Use Value: Single 5-V supply and 70-mW power dissipation enable battery-operated 8-hour runtime in handheld ECG units without thermal throttling. |
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 | 250 kSPS, 16-bit, but uses external reference only; no internal 2.5-V ref; 30-ns aperture delay vs. 5 ns. | Requires external reference IC and buffer; better suited for systems where reference sharing across multiple ADCs is needed. | Select when system-level reference management is preferred over self-contained operation; verify layout for lower aperture jitter tolerance. |
| AD7606BSTZ | 8-channel, simultaneous-sampling 16-bit ADC; 200 kSPS/channel; internal 2.5-V ref; parallel + SPI interface; 40-pin LQFP. | Replaces multiple ADS8509 units in multi-channel systems; adds oversampling and digital filtering but increases PCB area and power (100 mW). | Choose for channel count >1 and simultaneous sampling requirement; not drop-in - requires new layout, firmware, and decoupling strategy. |
Compared with ADS8509IBDBR, ADS8515IBDBR trades integrated reference simplicity for external reference flexibility and slightly relaxed timing, while AD7606BSTZ offers channel density and simultaneity at the cost of interface complexity and higher power - making ADS8509IBDBR optimal for single-channel, space-constrained, low-latency industrial sensing.
Availability
ADS8509IBDBR is available at Aetrix Electronics and suitable for industrial process control, data acquisition systems, and medical equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS8509IBDBR 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 ADS8509 belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-power, single-supply operation in harsh industrial and medical environments - emphasizing ease of use, minimal external components, and robust timing behavior.
FAQ
What is the maximum recommended external DATACLK frequency for ADS8509IBDBR?
The ADS8509IBDBR supports external DATACLK frequencies from 0.1 MHz to 26 MHz per the SLAS324C datasheet. Operation above 26 MHz violates timing margins and risks data corruption; 20 MHz is recommended for margin-safe designs. The ADS8509IBDBR internal clock runs at 9 MHz and is used when EXT/INT is low.
Does ADS8509IBDBR require external resistors for ±10-V input range?
Yes - the ADS8509IBDBR requires external precision resistors (e.g., 10 kΩ and 4.9 kΩ per Figure 29) to configure the ±10-V input range. These resistors set gain and offset; TI specifies 0.1% tolerance and 0.25-W rating to maintain ±2 LSB INL. The ADS8509IBDBR itself contains no programmable gain amplifier.
Can ADS8509IBDBR operate with an external reference, and what voltage range is supported?
Yes - the ADS8509IBDBR accepts external references from 2.3 V to 2.7 V on the REF pin. When using external reference, full-scale error drift improves to ±2 ppm/°C (vs. ±7 ppm/°C with internal reference), and the internal reference is disabled. The ADS8509IBDBR does not regulate or buffer external references - external buffering is required.
How does the PWRD pin affect data retention in ADS8509IBDBR?
When PWRD is driven high, the ADS8509IBDBR halts conversions and reduces power dissipation to 50 mW, but retains the most recent conversion result in its output shift register. Data remains accessible via serial interface until next valid conversion - enabling low-power sleep modes without losing last sampled value. The ADS8509IBDBR resumes normal operation within 1 ms of PWRD low.
Is ADS8509IBDBR pin-compatible with ADS7809 or ADS8508?
No - the ADS8509IBDBR (SSOP-28) is not pin-compatible with ADS7809 (SO-24) or ADS8508 (SSOP-28 but different pin functions). While the datasheet notes "pin-compatible with ADS7809 (low speed)", that refers only to the SO-20 variant (ADS8509IBDW), not the SSOP-28 ADS8509IBDBR. Layout reuse is not possible between these packages.
ADS8509IBDBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm 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:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8509IBDBR FAQ
1.How can I place an order for ADS8509IBDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8509IBDBR 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 ADS8509IBDBR reliable?
The price and inventory of ADS8509IBDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8509IBDBR is usually 5 days.
3.What payment methods are accepted for ADS8509IBDBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8509IBDBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8509IBDBR?
ADS8509IBDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8509IBDBR 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 ADS8509IBDBR?
For technical support, including ADS8509IBDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8509IBDBR requirements.
6.How does Aetrix verify that ADS8509IBDBR is sourced from the original manufacturer or authorized distributors?
All ADS8509IBDBR 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 ADS8509IBDBR meets industry standards.
7.What is the process for return or replacement of ADS8509IBDBR?
All ADS8509IBDBR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8509IBDBR, 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 ADS8509IBDBR part is unused and in its original packaging.
Return procedure for ADS8509IBDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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