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Texas Instruments ADS8515IBDBR
- Part No.:
- ADS8515IBDBR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS8515IBDBR.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,520
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Product details
Overview
ADS8515IBDBR from Texas Instruments is a 16-bit, 250-kSPS successive approximation register (SAR) analog-to-digital converter with ±10 V input range, internal 4.096 V reference, and full parallel 16-bit twos-complement output. It operates from a single +5 V analog supply and supports flexible I/O voltage (1.65–5.25 V), delivering 90 dB min SNR at 20 kHz for precision industrial data acquisition.
For engineers reviewing the ADS8515IBDBR datasheet, ADS8515IBDBR pinout, ADS8515IBDBR application, or ADS8515IBDBR equivalent, this page provides verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The ADS8515IBDBR implements a capacitor-based SAR architecture with integrated sample-and-hold, internal reference buffer, and three-state parallel drivers. Its control logic uses CS and R/C pins in ORed configuration to initiate conversion and enable data output, with BUSY signaling conversion completion.
It features dual-mode data access: full 16-bit parallel read (D0–D15) or byte-wise access via BYTE pin toggling. Input impedance is 8.885 kΩ with 75 pF capacitance, and it supports both internal reference (4.096 V ±20 mV, 8 ppm/°C drift) and external reference (3.9–4.2 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 305 µV LSB step size over ±10 V range for high-fidelity signal digitization. |
| Throughput Rate | 250 kSPS - enables real-time sampling of up to 100 kHz bandwidth signals per Nyquist criterion. |
| INL / DNL | ±2.0 LSB max INL, ±1 LSB max DNL - ensures monotonicity and <0.003% full-scale linearity error for calibration-sensitive systems. |
| SNR / SINAD | 90 dB min SNR, 89 dB min SINAD at 20 kHz - supports >14.6 ENOB for demanding instrumentation applications. |
| Power Dissipation | 100 mW typ at 250 kSPS - enables low-thermal-load operation in dense industrial PCB layouts. |
| Reference Options | Internal 4.096 V ±20 mV or external 3.9–4.2 V - allows trade-off between simplicity (internal) and enhanced stability (external buffered reference). |
| Operating Temperature | –40°C to +85°C - fully specified for industrial environments without derating. |
Pinout & Package
ADS8515IBDBR is housed in a 28-pin SSOP (DB) package with exposed pad thermal enhancement. Pin spacing is 0.65 mm, body dimensions are 10.2 × 5.3 mm, and maximum height is 1.95 mm. The layout separates analog (AGND1, AGND2, CAP, REF, VIN, VANA) and digital (DGND, D0–D15, CS, R/C, BYTE, BUSY, VDIG) domains to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Analog input | ±10 V differential input referenced to AGND1; includes internal 2 kΩ/25.67 kΩ resistor network for overvoltage protection to ±25 V. |
| AGND1 (Pin 2) | Analog ground reference | Primary analog signal return; must be connected directly to low-impedance analog ground plane to avoid offset errors. |
| REF (Pin 3) | Reference I/O | Output of internal 4.096 V reference or input for external reference; requires 2.2 µF tantalum capacitor to CAP pin. |
| CAP (Pin 4) | Reference buffer output | Stabilized output of internal reference buffer; drives CDAC during conversion; ESR ≤3 Ω required on 2.2 µF capacitor. |
| AGND2 (Pin 5) | Analog supply ground | Return path for VANA; electrically isolated from AGND1 but tied to same ground plane at single point near power entry. |
| D15 (MSB) to D0 (LSB) (Pins 6–13, 15–22) | Parallel data outputs | 16-bit twos-complement output bus; Hi-Z when CS high or R/C low; valid after BUSY goes high. |
| BUSY (Pin 26) | Status output | Active-low open-drain signal indicating conversion in progress; transitions high when output registers updated and data ready. |
| CS (Pin 25) | Chip select input | Level-sensitive control; when low with R/C low, initiates conversion; when low with R/C high, enables parallel output. |
| R/C (Pin 24) | Read/Convert control | Falling edge initiates conversion if CS low; rising edge enables output if CS low; internally ORed with CS. |
| BYTE (Pin 23) | Byte-select input | Low = D8–D15 (MSB byte); high = D0–D7 (LSB byte); enables 8-bit microprocessor interface without 16-bit bus. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +5 V analog supply (VANA) with independent 1.65–5.25 V digital I/O (VDIG) - eliminates need for dual-rail supplies in mixed-signal systems. |
| Pin-compatible upgrade path | Direct replacement for ADS7805/ADS7810 (12-bit) and ADS7804/ADS8504 - enables resolution upgrade without PCB redesign. |
| No missing codes | Guaranteed 16-bit monotonicity across full temperature range - critical for closed-loop control and servo applications. |
| Integrated reference buffer | On-chip 4.096 V reference with 8 ppm/°C drift and 1 mA source capability - reduces BOM count and improves layout robustness vs. external references. |
| Overvoltage-tolerant input | ±25 V absolute max rating with internal 2 kΩ/25.67 kΩ resistor divider - protects against field-wiring faults in industrial sensor interfaces. |
Applications
| Industrial Process Control | Data Acquisition Systems |
|---|---|
|
Use Scenario: High-accuracy monitoring of 4–20 mA current loops, thermocouple outputs, and strain gauge bridges in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC capturing sensor data at 250 kSPS with ±10 V range and 16-bit resolution for PID controller feedback. Use Value: ±2 LSB INL and 90 dB SNR ensure sub-0.01% measurement accuracy over –40°C to +85°C, reducing calibration frequency in field-deployed equipment. |
Use Scenario: Modular DAQ chassis acquiring synchronized multi-channel voltage waveforms from vibration sensors and accelerometers. IC Role / Device Role / Timing Role: Channel-specific SAR ADC with parallel output enabling simultaneous readout across 8+ channels via FPGA or microcontroller bus. Use Value: Full 16-bit parallel interface and 83 ns bus access timing allow deterministic data capture without DMA overhead, supporting real-time FFT analysis. |
| Digital Signal Processing | Medical Equipment |
|
Use Scenario: Front-end digitization in portable ultrasound beamformers requiring low-noise, high-SFDR signal conditioning before FPGA-based processing. IC Role / Device Role / Timing Role: Precision ADC providing 97 dB SFDR at 20 kHz for clean baseband signal capture prior to digital down-conversion. Use Value: 95–102 dB SFDR and 88–92 dB SNR suppress harmonic artifacts from switching power supplies, preserving diagnostic image fidelity. |
Use Scenario: Patient monitoring systems digitizing ECG, EEG, and respiration waveforms with clinical-grade accuracy and low power consumption. IC Role / Device Role / Timing Role: Low-power 16-bit ADC operating at 250 kSPS with internal reference to minimize external components in battery-powered devices. Use Value: 100 mW typical power dissipation and –40°C to +85°C specification support compact, fanless enclosures compliant with IEC 60601-1 safety standards. |
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 |
|---|---|---|---|
| ADS8517IBDBR | 250 kSPS, ±10 V range, but 18-bit resolution and 92 dB SNR; requires external reference for full spec compliance. | Used where higher resolution is needed for dynamic range extension (e.g., seismic sensing), not drop-in compatible due to different reference architecture. | Select ADS8517IBDBR only when 18-bit ENOB and lower DNL (±0.5 LSB) justify added cost and external reference complexity. |
| ADS8688IPWR | 16-bit, 500 kSPS, ±10 V range, integrated PGA (0.25–16×), but uses serial SPI interface instead of parallel; 105 mW power. | Suitable for space-constrained designs needing programmable gain and lower pin count, but incompatible with legacy parallel-bus microcontrollers. | Choose ADS8688IPWR when system-level flexibility (gain scaling, channel sequencing) outweighs loss of deterministic parallel readout timing. |
Compared with ADS8515IBDBR, ADS8517IBDBR offers higher resolution at the cost of reference dependency, while ADS8688IPWR trades parallel interface simplicity for integrated signal conditioning and higher speed-neither is pin-compatible, but both address adjacent design requirements in test and measurement systems.
Availability
ADS8515IBDBR is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS8515IBDBR 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 ADS8515IBDBR belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-noise industrial and medical signal digitization where resolution, linearity, and temperature stability are critical.
FAQ
What is the absolute maximum input voltage rating for the ADS8515IBDBR?
The ADS8515IBDBR has an absolute maximum analog input voltage rating of ±25 V on VIN (Pin 1), as specified in the Absolute Maximum Ratings table. This overvoltage tolerance is enabled by its internal 2 kΩ/25.67 kΩ resistor divider network. Operation beyond ±10 V full-scale range will saturate the ADC output but will not damage the device if duration is limited and within the ±25 V limit.
Does the ADS8515IBDBR require external decoupling capacitors, and if so, what values?
Yes, the ADS8515IBDBR requires specific decoupling: a 0.1 µF ceramic capacitor and a 10 µF tantalum capacitor between VANA (Pin 27) and AGND2 (Pin 5); a 2.2 µF tantalum capacitor between CAP (Pin 4) and AGND2; and a 2.2 µF tantalum capacitor between REF (Pin 3) and AGND2. These values are mandatory for stable reference buffering, low-noise conversion, and transient immunity per the SLAS460D datasheet.
Can the ADS8515IBDBR operate with an external reference, and what is the supported voltage range?
Yes, the ADS8515IBDBR supports external reference operation. When an external voltage is applied to REF (Pin 3), the internal 4.096 V reference is disabled. The supported external reference range is 3.9 V to 4.2 V, with optimal performance at 4.096 V. Using an external reference improves full-scale error drift to ±2 ppm/°C (vs. ±7 ppm/°C internal) and reduces full-scale error to ±0.1% FSR.
How does the BYTE pin function in the ADS8515IBDBR, and when is it used?
The BYTE pin (Pin 23) controls 8-bit data access mode: when LOW, D8–D15 (MSB byte) appear on pins 6–13; when HIGH, D0–D7 (LSB byte) appear on pins 15–22. This allows 8-bit microcontrollers to read the full 16-bit result in two cycles without requiring a 16-bit bus. BYTE must be stable before R/C rises to enable output, and timing is validated per Table 3 in SLAS460D.
What is the guaranteed missing-code performance of the ADS8515IBDBR across temperature?
The ADS8515IBDBR guarantees no missing codes across its entire specified operating temperature range of –40°C to +85°C. This is explicitly stated in the Electrical Characteristics table under "No missing codes" with "16 Bits" for both ADS8515I and ADS8515IB grades. It is a hard specification-not typical or conditional-and applies to all production units meeting the IB grade binning.
ADS8515IBDBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm 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:
- Parallel
- 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:
- 1.65V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8515IBDBR FAQ
1.How can I place an order for ADS8515IBDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8515IBDBR 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 ADS8515IBDBR reliable?
The price and inventory of ADS8515IBDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8515IBDBR is usually 5 days.
3.What payment methods are accepted for ADS8515IBDBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8515IBDBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8515IBDBR?
ADS8515IBDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8515IBDBR 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 ADS8515IBDBR?
For technical support, including ADS8515IBDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8515IBDBR requirements.
6.How does Aetrix verify that ADS8515IBDBR is sourced from the original manufacturer or authorized distributors?
All ADS8515IBDBR 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 ADS8515IBDBR meets industry standards.
7.What is the process for return or replacement of ADS8515IBDBR?
All ADS8515IBDBR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8515IBDBR, 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 ADS8515IBDBR part is unused and in its original packaging.
Return procedure for ADS8515IBDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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