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Analog Devices Inc. AD976BRS
- Part No.:
- AD976BRS
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD976BRS.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,891
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Product details
Overview
AD976BRS from Analog Devices is a 16-bit, 100 kSPS successive-approximation analog-to-digital converter (ADC) with ±10 V bipolar input range, internal 2.5 V reference, and parallel interface - designed for precision data acquisition in industrial instrumentation and test equipment requiring high DC accuracy and moderate speed.
For engineers reviewing the AD976BRS datasheet, AD976BRS pinout, AD976BRS application, or AD976BRS equivalent, this page delivers verified specifications, package mapping to 28-lead SSOP (RS-28), functional pin roles, real-world use cases, and two validated alternative parts - all grounded in Analog Devices' official AD976/AD976A Rev. D documentation.
Technical Context
The AD976BRS implements a switched-capacitor SAR architecture with on-chip laser-trimmed capacitor array calibration, eliminating external sample-and-hold circuitry. It uses binary twos-complement output coding and supports both internal (2.5 V) and external reference configurations.
Control logic accepts R/C and CS inputs to initiate conversion and manage data read timing; BUSY signal indicates conversion status, while BYTE enables byte-swapped 8-bit parallel access. The device operates across –40°C to +85°C with single 5 V supply (VANA = VDIG = 5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - delivers 305 µV LSB step size over ±10 V full-scale range. |
| Throughput Rate | 100 kSPS - fixed conversion time of 10 µs per sample, enabling deterministic timing in closed-loop control. |
| Analog Input Range | ±10 V - standard industrial bipolar range, supported by 23 kΩ input impedance and 22 pF capacitance. |
| DC Accuracy (INL) | ±2 LSB (B-grade) - factory-calibrated linearity error ensures <15-bit effective resolution without user trimming. |
| AC Performance (S/(N+D)) | 85 dB at 100 kHz - corresponds to ~14.1 ENOB, suitable for medium-bandwidth signal analysis. |
| Power Dissipation | 100 mW max - low thermal load enables dense PCB layouts without forced cooling. |
| Reference | Internal 2.5 V ±0.2% - stable voltage source eliminates need for external reference IC in cost-sensitive designs. |
Pinout & Package
AD976BRS is housed in a 28-lead Shrink Small Outline Package (SSOP), designated RS-28, with 0.65 mm lead pitch and exposed pad not electrically connected. This compact surface-mount package supports automated assembly and offers improved thermal resistance vs. SOIC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input | Accepts ±10 V differential input; requires 200 Ω series resistor for overvoltage protection and drive impedance matching. |
| REF | Reference I/O | Provides internal 2.5 V reference or accepts external 2.3–2.7 V source; must be decoupled to AGND1 with 2.2 µF tantalum capacitor. |
| CAP | Reference buffer output | Stabilizes internal reference; connects to AGND2 via 2.2 µF tantalum capacitor to suppress noise coupling. |
| D0–D15 | Parallel data outputs | 16-bit binary twos-complement result; high-impedance when CS = HIGH or R/C = LOW; BYTE controls MSB/LSB byte ordering. |
| R/C | Read/Convert control | Falling edge initiates conversion when CS = LOW; rising edge enables output data latch after conversion completes. |
| CS | Chip select | Enables interface; falling edge triggers conversion (R/C = LOW) or data output (R/C = HIGH); disables outputs when HIGH. |
| BUSY | Status indicator | Active-low open-drain output signals conversion progress; rising edge marks data validity for synchronous latching. |
| AGND1 / AGND2 / DGND | Analog/digital ground | Separate ground pins minimize digital switching noise injection into analog path; AGND1 references REF, AGND2 references CAP. |
| VANA / VDIG | Power supplies | Independent 5 V analog and digital rails reduce supply coupling; each rated for 4.75–5.25 V with specified ripple tolerance. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip calibration | Factory-trimmed capacitor array and stored ROM coefficients correct for INL/DNL errors, reducing system-level calibration effort. |
| Integrated reference | 2.5 V ±0.2% internal reference eliminates BOM cost and board space for external reference IC in most applications. |
| Single-supply operation | Full 16-bit performance from one 5 V rail simplifies power design and avoids dual-supply sequencing complexity. |
| High-speed parallel interface | 83 ns bus access/relinquish times enable direct connection to microcontrollers and DSPs without glue logic. |
| Overvoltage protection | ±25 V absolute max rating on VIN allows safe operation during transient fault conditions in industrial environments. |
Applications
| Industrial Data Logger | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous monitoring of temperature, pressure, and strain sensor outputs in factory-floor environmental logging systems. IC Role / Device Role / Timing Role: Primary ADC capturing slow-varying analog signals at 100 kSPS with high DC stability and low drift. Use Value: ±2 LSB INL and ±10 mV bipolar zero error ensure accurate long-term trending without periodic recalibration. |
Use Scenario: Digitizing calibrated stimulus waveforms and response signals in benchtop ATE platforms performing parametric testing. IC Role / Device Role / Timing Role: Precision digitizer interfacing directly to FPGA-controlled parallel bus for deterministic sampling and trigger synchronization. Use Value: BUSY-driven timing and 83 ns bus access support tight loop timing in multi-channel synchronized capture sequences. |
| Medical Instrumentation Front-End | Power Quality Analyzer |
Use Scenario: Signal conditioning stage in portable ECG or EEG devices acquiring bio-potential signals with high common-mode rejection. IC Role / Device Role / Timing Role: Bipolar-input ADC accepting conditioned ±10 V signals from instrumentation amplifiers; isolated ground domains preserve signal integrity. Use Value: Separate AGND1/AGND2 pins and 22 pF input capacitance enable clean analog partitioning and minimal charge injection during sampling. |
Use Scenario: Voltage and current waveform digitization in three-phase power analyzers measuring harmonics and THD up to 1.5 MHz input bandwidth. IC Role / Device Role / Timing Role: High-fidelity acquisition channel capturing fundamental and harmonic content with 85 dB S/(N+D) at 100 kHz throughput. Use Value: 83 dB typical THD and 90 dB SFDR meet IEC 61000-4-30 Class A requirements for harmonic distortion measurement accuracy. |
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 |
|---|---|---|---|
| AD976BR | Same specs, but in 28-lead SOIC (R-28) package - 1.27 mm pitch, larger footprint, higher θJA (72°C/W). | Suitable for prototyping or legacy SOIC-based designs where board rework is impractical. | Select AD976BR only if SSOP assembly capability is unavailable or thermal margin exceeds 700 mW dissipation limits. |
| ADS8686SIPWR | 16-bit, 1 MSPS SAR ADC with integrated PGA, reference, and SPI interface; no parallel bus; 3.3 V digital I/O. | Targets higher-speed, lower-power, or isolated systems using modern microcontrollers with SPI peripherals. | Choose ADS8686SIPWR when upgrading throughput beyond 100 kSPS or replacing discrete signal chain components with integrated solution. |
Compared with AD976BRS, AD976BR offers identical electrical performance in a larger SOIC package, while ADS8686SIPWR trades parallel interface simplicity for higher speed, integrated signal conditioning, and SPI compatibility - making it better suited for new designs prioritizing density and flexibility over legacy bus compatibility.
Availability
AD976BRS is available at Aetrix Electronics and suitable for industrial data loggers, automated test equipment, medical instrumentation front-ends, and power quality analyzers requiring stable component supply and long-term obsolescence management.
Supply support for AD976BRS 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD976 family was engineered for precision, single-supply, medium-speed data acquisition - targeting industrial, medical, and test equipment where 16-bit resolution, ±10 V range, and factory-calibrated linearity are critical.
FAQ
What is the maximum sampling rate supported by the AD976BRS?
The AD976BRS supports a maximum throughput rate of 100 kSPS, corresponding to a fixed 10 µs conversion time per sample. This is confirmed in the AD976–SPECIFICATIONS table under "THROUGHPUT SPEED" for all grades of the AD976 (non-A) variant. The AD976BRS is the B-grade version of the AD976, not the faster AD976A, and therefore does not support 200 kSPS operation.
Does the AD976BRS require an external reference voltage?
No, the AD976BRS does not require an external reference voltage. It integrates a factory-trimmed 2.5 V internal reference (2.48 V to 2.52 V) that meets specified linearity and drift performance. An external reference may be used optionally between 2.3 V and 2.7 V, but the internal reference is fully functional and commonly deployed in production designs using AD976BRS.
What package type is used for the AD976BRS?
The AD976BRS uses a 28-lead Shrink Small Outline Package (SSOP), identified in the Ordering Guide as RS-28. This package has a 0.65 mm lead pitch and is distinct from the SOIC (R-28) and PDIP (N-28B) variants. Pinout and thermal characteristics are consistent across AD976/AD976A packages, and the RS-28 footprint is documented in the AD976/AD976A Rev. D datasheet.
How is the AD976BRS calibrated for linearity errors?
The AD976BRS employs on-chip laser-trimmed capacitor array calibration with factory-programmed coefficients stored in thin-film resistors acting as ROM. During conversion, these coefficients dynamically adjust the SAR decision process to correct for capacitor mismatch-induced INL and DNL errors. This calibration is performed at wafer level and requires no user intervention - the AD976BRS achieves ±2 LSB INL (B-grade) without external trimming.
Can the AD976BRS interface directly with a 3.3 V microcontroller?
No, the AD976BRS cannot interface directly with a 3.3 V microcontroller's data bus. Its digital outputs operate at 5 V logic levels (VOH ≥ 4.0 V, VOL ≤ 0.4 V) and require VDIG = 5 V. Driving a 3.3 V controller input directly risks overvoltage damage. Level-shifting circuitry or a 5 V-tolerant microcontroller interface is required to safely connect AD976BRS to 3.3 V systems.
AD976BRS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- 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:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD976BRS FAQ
1.How can I place an order for AD976BRS through Aetrix?
Please submit a Request for Quotation (RFQ) for AD976BRS 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 AD976BRS reliable?
The price and inventory of AD976BRS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD976BRS is usually 5 days.
3.What payment methods are accepted for AD976BRS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD976BRS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD976BRS?
AD976BRS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD976BRS 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 AD976BRS?
For technical support, including AD976BRS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD976BRS requirements.
6.How does Aetrix verify that AD976BRS is sourced from the original manufacturer or authorized distributors?
All AD976BRS 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 AD976BRS meets industry standards.
7.What is the process for return or replacement of AD976BRS?
All AD976BRS units undergo pre-shipment inspection (PSI). If there is an issue with AD976BRS, 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 AD976BRS part is unused and in its original packaging.
Return procedure for AD976BRS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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