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Analog Devices Inc. AD976ARZ
- Part No.:
- AD976ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD976ARZ.pdf
- Description:
- IC ADC 16BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,266
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Product details
Overview
AD976ARZ from Analog Devices is a 16-bit, 100 kSPS successive-approximation analog-to-digital converter (ADC) fabricated in BiCMOS, operating from a single +5 V supply with ±10 V analog input range, internal 2.5 V reference, and parallel 16-bit twos-complement interface - used in precision data acquisition systems for industrial instrumentation and test equipment.
For engineers reviewing the AD976ARZ datasheet, AD976ARZ pinout, AD976ARZ application, or AD976ARZ equivalent, this page delivers verified technical context, package mapping to SOIC-28, real-world timing behavior, confirmed DC/AC accuracy specs, and validated alternative options for high-resolution, moderate-speed sampling applications.
Technical Context
The AD976ARZ implements a switched-capacitor SAR architecture with on-chip laser-trimmed capacitor array calibration, eliminating external sample-and-hold circuitry and minimizing temperature-induced linearity drift. It integrates an internal 2.5 V reference (±0.2% initial accuracy) and on-chip clock generator.
Control is managed via dual asynchronous inputs - R/C (Read/Convert) and CS (Chip Select) - supporting both continuous conversion mode (CS tied low) and command-triggered mode (CS pulsed), with BUSY output signaling conversion completion and data validity. The BYTE pin enables 16-bit parallel or byte-swapped 8-bit readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 305 µV LSB step size over ±10 V full-scale range, enabling sub-millivolt measurement resolution. |
| Throughput Rate | 100 kSPS - supports real-time sampling of signals up to 700 kHz full-power bandwidth with ≥10-bit ENOB. |
| DC Accuracy (INL) | ±3 LSB max (A-grade) - ensures monotonicity and ≤0.0046% integral nonlinearity across full temperature range (–40°C to +85°C). |
| AC Performance (S/(N+D)) | 83 dB typical at 20 kHz - corresponds to ~13.8 effective number of bits (ENOB), suitable for medium-fidelity signal digitization. |
| Input Range & Interface | ±10 V bipolar analog input with 23 kΩ impedance; parallel 16-bit twos-complement output with TTL/CMOS-compatible logic levels. |
| Power & Supply | 100 mW max dissipation at +5 V (VANA = VDIG = 5 V); separate analog/digital supplies reduce noise coupling. |
| Reference Options | Internal 2.5 V reference (2.48–2.52 V, ±7 ppm/°C drift) or external reference (2.3–2.7 V), with 100 µA max current drain. |
Pinout & Package
AD976ARZ is packaged in a 28-lead Small Outline Integrated Circuit (SOIC) with standard 300-mil body width and gull-wing leads (package code R-28). Pin spacing is 0.050 inch (1.27 mm), compatible with automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog Input | ±10 V differential input node; requires 200 Ω series resistor and low-impedance drive to maintain linearity and transient response. |
| REF | Reference I/O | Provides internal 2.5 V reference or accepts external reference; must be decoupled to AGND1 with 2.2 µF tantalum capacitor. |
| CAP | Reference Buffer Output | Stabilizes internal reference; requires 2.2 µF tantalum capacitor to AGND2 to suppress noise and ensure settling. |
| D0–D15 | Parallel Data Outputs | 16-bit twos-complement digital output; high-impedance when CS HIGH or R/C LOW; BYTE pin controls MSB/LSB byte ordering. |
| R/C | Read/Convert Control | Falling edge initiates conversion (with CS LOW); rising edge enables data output; minimum pulse width 50 ns. |
| CS | Chip Select | Active-low enable; OR'd internally with R/C; controls conversion start or data latch depending on R/C state. |
| BUSY | Status Output | Active-low open-drain signal indicating conversion in progress; rises 4.0 µs after conversion completion (AD976). |
| VANA / VDIG | Analog/Digital Supplies | Separate +5 V rails (4.75–5.25 V) minimize digital switching noise coupling into analog path; require local 0.1 µF + 2.2 µF decoupling. |
| AGND1 / AGND2 / DGND | Ground Terminals | AGND1 references REF; AGND2 references CAP; DGND is digital return - must be connected at single point to avoid ground loops. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Calibrated SAR Architecture | On-chip thin-film ROM stores capacitor mismatch correction coefficients, reducing INL to ±3 LSB without user calibration. |
| Integrated Reference & Clock | Eliminates need for external voltage reference IC or system clock source - reduces BOM count and layout complexity. |
| Byte-Selectable Parallel Interface | BYTE pin toggles between full 16-bit bus (Pins 6–22) and split 8-bit byte mode (Pins 6–13 and 15–22), easing FPGA/microcontroller interfacing. |
| Overvoltage Protection | Withstands ±25 V on VIN indefinitely; recovers to full accuracy within 150 ns after 2×FS overvoltage event. |
| Low-Power Single-Supply Operation | 100 mW max power at +5 V enables use in thermally constrained industrial modules without forced cooling. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: Precision digitizer capturing slow-varying analog signals at 100 kSPS with ±10 V range compatibility. Use Value: Delivers 16-bit resolution and factory-calibrated linearity to support NIST-traceable calibration without external trimming. |
Use Scenario: Digitizing stimulus-response waveforms during functional testing of analog circuits and power supplies. IC Role / Device Role / Timing Role: High-fidelity front-end ADC synchronized to system controller via R/C and BUSY handshake. Use Value: Enables accurate THD and SNR measurements down to –90 dB with 83 dB S/(N+D) at 20 kHz input. |
| Medical Instrumentation | Scientific Data Logging |
|
Use Scenario: Signal conditioning in portable ECG and EEG acquisition units requiring low power and bipolar input capability. IC Role / Device Role / Timing Role: Low-noise, single-supply ADC interfaced to microcontroller via parallel bus with BYTE-controlled read timing. Use Value: Internal 2.5 V reference and separate AGND1/AGND2 pins minimize offset drift and improve common-mode rejection. |
Use Scenario: Long-term environmental sensing (vibration, acoustic emission) using battery-powered field loggers. IC Role / Device Role / Timing Role: Energy-efficient digitizer operating at 100 kSPS with 100 mW dissipation and robust overvoltage tolerance. Use Value: ±25 V input protection and 150 ns overvoltage recovery prevent damage from transients in unshielded field deployments. |
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 |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1 MSPS SAR ADC with SPI interface, 1.8 V supply, no internal reference - requires external REF and level-shifting. | Higher speed but serial interface increases controller overhead; lacks ±10 V input and integrated reference. | Choose for compact, low-voltage designs where throughput >100 kSPS is critical and board space is constrained. |
| MAX11270EEE+ | 16-bit, 10 kSPS delta-sigma ADC with internal oscillator, 2.5 V reference, and PGA - optimized for low-noise DC measurements. | Lower speed, higher resolution (24-bit effective), but unsuitable for dynamic signal capture above 1 kHz. | Prefer for high-precision weigh scales or thermocouple readouts where noise floor <1 µV RMS matters more than speed. |
Compared with ADS8860IDRCT and MAX11270EEE+, the AD976ARZ uniquely balances 100 kSPS throughput, ±10 V bipolar input, internal reference, and parallel interface - making it optimal for legacy industrial controllers and test systems requiring minimal firmware changes and proven long-term stability.
Availability
AD976ARZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical instrumentation, and scientific data logging requiring stable component supply and long-lifecycle support.
Supply support for AD976ARZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD976ARZ belongs to Analog Devices' precision data acquisition product line, designed specifically for high-resolution, moderate-speed sampling in harsh industrial environments with minimal external components.
FAQ
What is the maximum sampling rate supported by the AD976ARZ?
The AD976ARZ supports a maximum throughput rate of 100 kSPS, corresponding to a complete conversion time of 10 µs. This is specified for all grades (A/B/C) across the full operating temperature range (–40°C to +85°C) with internal reference and +5 V supplies. The AD976A variant achieves 200 kSPS, but AD976ARZ is the 100 kSPS version.
Does the AD976ARZ require external calibration for production use?
No - the AD976ARZ undergoes full factory calibration for offset, gain, and integral linearity errors, achieving ±3 LSB INL (A-grade) without user adjustment. External trim resistors (e.g., R3/R4 in Figure 7) are optional and only needed if system-level accuracy demands exceed datasheet specifications.
Can the AD976ARZ operate with an external reference, and what voltage range is supported?
Yes - the AD976ARZ accepts an external reference voltage from 2.3 V to 2.7 V applied to the REF pin, with 100 µA maximum current draw. When using external reference, full-scale input becomes ±4 × VREF, preserving linearity and specified AC performance within that range.
What is the purpose of the CAP pin on the AD976ARZ?
The CAP pin is the output of the internal reference buffer and must be decoupled to AGND2 with a 2.2 µF tantalum capacitor. This stabilizes the reference voltage during conversion cycles, reducing noise and ensuring consistent 2.5 V reference accuracy - omission causes increased INL and degraded AC performance.
How does the BYTE pin affect data readout timing on the AD976ARZ?
The BYTE pin selects between two data output formats: when LOW, D15 (MSB) appears on Pin 6 and D0 (LSB) on Pin 22; when HIGH, D15–D8 appear on Pins 15–22 and D7–D0 on Pins 6–13. This allows flexible alignment with 8-bit microcontrollers or FPGAs without external byte-swapping logic.
AD976ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD976ARZ FAQ
1.How can I place an order for AD976ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD976ARZ 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 AD976ARZ reliable?
The price and inventory of AD976ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD976ARZ is usually 5 days.
3.What payment methods are accepted for AD976ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD976ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD976ARZ?
AD976ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD976ARZ 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 AD976ARZ?
For technical support, including AD976ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD976ARZ requirements.
6.How does Aetrix verify that AD976ARZ is sourced from the original manufacturer or authorized distributors?
All AD976ARZ 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 AD976ARZ meets industry standards.
7.What is the process for return or replacement of AD976ARZ?
All AD976ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD976ARZ, 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 AD976ARZ part is unused and in its original packaging.
Return procedure for AD976ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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