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Analog Devices Inc. AD976ACNZ
- Part No.:
- AD976ACNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD976ACNZ.pdf
- Description:
- IC ADC 16BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,074
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Product details
Overview
AD976ACNZ from Analog Devices is a 16-bit, 200 kSPS BiCMOS analog-to-digital converter with ±10 V 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 low power (100 mW max) from a single +5 V supply.
For engineers reviewing the AD976ACNZ datasheet, AD976ACNZ pinout, AD976ACNZ application, or AD976ACNZ equivalent, this page delivers verified specifications, validated package mapping (28-lead PDIP), confirmed timing behavior (4.0 µs conversion time), and real-world interface constraints including BYTE-controlled 16-bit/8-bit data bus routing and BUSY-synchronized read control.
Technical Context
The AD976ACNZ implements a successive-approximation ADC architecture using a laser-trimmed capacitor array instead of resistor ladders, eliminating temperature-induced linearity drift. It integrates factory-calibrated thin-film ROM coefficients to correct capacitor mismatches, achieving ±2 LSB integral nonlinearity (A-grade) and guaranteed no missing codes.
Its analog front-end features dual analog grounds (AGND1 for REF/VIN reference, AGND2 for CAP), ±25 V overvoltage protection on VIN, and a 13 kΩ input impedance with 22 pF capacitance - optimized for direct connection to low-impedance op-amp drivers in ±10 V signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 305 µV LSB step size across ±10 V full-scale range. |
| Throughput Rate | 200 kSPS - enables 5 µs minimum inter-conversion interval for real-time sampling in closed-loop control. |
| DC Accuracy (INL) | ±2 LSB (A-grade) - ensures monotonicity and <0.003% full-scale error without external trimming. |
| Analog Input Range | ±10 V - compatible with standard industrial sensor outputs and isolated signal conditioning stages. |
| Power Dissipation | 100 mW max - supports thermally constrained designs without forced cooling or derating. |
| Reference | Internal 2.5 V ±0.02 V - eliminates need for external reference IC while maintaining 83 dB S/(N+D) at 45 kHz input. |
| Digital Interface | Parallel 16-bit, binary two's complement - directly interfaces to 16-bit microcontrollers and DSPs without glue logic. |
Pinout & Package
AD976ACNZ is housed in a 28-lead plastic DIP (PDIP) package with 300 mil width, compatible with through-hole prototyping and legacy industrial PCB layouts. Pin spacing follows JEDEC MS-001 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input | Accepts ±10 V differential input referenced to AGND1; includes ±25 V overvoltage protection. |
| REF | Reference I/O | Provides internal 2.5 V reference or accepts external 2.3–2.7 V source; requires 2.2 µF tantalum to AGND1. |
| CAP | Reference buffer output | Stabilizes internal reference; must connect 2.2 µF tantalum capacitor to AGND2. |
| D15–D0 | Parallel data outputs | 16-bit two's complement result; high-impedance when CS = HIGH or R/C = LOW. |
| BYTE | Data bus configuration | Switches between full 16-bit (BYTE = LOW) and split 8-bit byte mode (BYTE = HIGH). |
| R/C | Read/Convert control | Falling edge initiates conversion; rising edge enables data output after BUSY goes HIGH. |
| CS | Chip select | OR'd with R/C; falling edge triggers conversion or data enable depending on R/C state. |
| BUSY | Status indicator | Active-low open-drain output; signals conversion in progress; rising edge marks data validity. |
| VANA / VDIG | Power supplies | Separate analog (+5 V) and digital (+5 V) rails minimize noise coupling; each draws ≤11 mA / 3 mA. |
| AGND1 / AGND2 / DGND | Ground terminals | AGND1 references REF/VIN; AGND2 references CAP; DGND isolates digital switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip calibration ROM | Stores laser-trimmed correction coefficients for capacitor mismatch, enabling ±2 LSB INL without user trimming. |
| Capacitor-array SAR architecture | Replaces resistor ladder with binary-weighted capacitors - eliminates thermal linearity drift and removes external sample/hold requirement. |
| Two-mode parallel interface | Supports full 16-bit reads (BYTE = LOW) or byte-swapped 8-bit transfers (BYTE = HIGH) for compatibility with 8-bit microcontrollers. |
| Dual analog ground separation | AGND1 (REF/VIN reference) and AGND2 (CAP reference) prevent ground-loop errors in precision bipolar signal chains. |
| Overvoltage recovery | Recovers to full accuracy within 150 ns after 2× full-scale (±20 V) transient - protects against sensor fault conditions. |
Applications
| Industrial Data Acquisition | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: High-accuracy voltage monitoring in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Primary ADC capturing ±10 V sensor outputs (e.g., strain gauges, RTDs) at 200 kSPS with synchronized BUSY-driven data capture. Use Value: Factory-calibrated ±2 LSB INL and internal 2.5 V reference eliminate field calibration and reduce BOM count by one component. |
Use Scenario: Digitizing stimulus-response waveforms during semiconductor device characterization. IC Role / Device Role / Timing Role: Precision sampling engine interfacing to FPGA-based pattern generators via parallel 16-bit bus with BYTE-controlled data alignment. Use Value: 83 dB S/(N+D) at 45 kHz and 150 ns overvoltage recovery ensure fidelity in fast transient measurements without dead time. |
| Medical Instrumentation | Energy Metering Reference Design |
|
Use Scenario: ECG signal digitization in portable diagnostic devices requiring low power and DC stability. IC Role / Device Role / Timing Role: Bipolar ADC converting amplified bio-potential signals (±10 V range) using internal reference and single +5 V supply. Use Value: 100 mW max dissipation and ±7 ppm/°C full-scale drift support battery-powered operation with minimal thermal drift over clinical temperature ranges. |
Use Scenario: High-precision voltage channel in Class 0.2 polyphase energy meters compliant with IEC 62053-22. IC Role / Device Role / Timing Role: Metrology-grade ADC sampling AC mains voltage with ±10 V input scaling and calibrated gain/offset compensation. Use Value: Guaranteed no missing codes and 16-bit resolution enable 0.0015% basic accuracy - meeting stringent metrology linearity requirements. |
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, SPI interface, external reference only, 1.8 V supply - lacks internal reference and ±10 V input capability. | Requires external op-amp driver and reference IC; suited for low-voltage, high-speed portable systems - not drop-in for industrial ±10 V signal chains. | Select when system already uses SPI infrastructure and operates below 3.3 V; avoid if ±10 V direct sensing or single-supply simplicity is required. |
| MAX1190ECM+ | 16-bit, 100 kSPS, ±10 V input, internal reference, but uses 3-wire serial interface and requires external clock generator. | Lacks parallel bus and BYTE mode; slower throughput limits real-time control loop bandwidth compared to AD976ACNZ. | Choose for space-constrained designs where serial interface suffices and 100 kSPS meets timing budget - not for existing 16-bit parallel bus architectures. |
Compared with ADS8860IDRCT and MAX1190ECM+, the AD976ACNZ uniquely combines 200 kSPS parallel throughput, ±10 V input, internal reference, and DIP packaging - making it irreplaceable in legacy industrial DAQ systems requiring minimal redesign and guaranteed DC accuracy.
Availability
AD976ACNZ is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, medical instrumentation, and energy metering applications requiring stable component supply across extended product lifecycles.
Supply support for AD976ACNZ 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 AD976 family was engineered for high-accuracy, single-supply data acquisition in harsh industrial environments - emphasizing factory-calibrated DC precision, robust overvoltage tolerance, and ease of integration into legacy 16-bit parallel systems.
FAQ
What is the maximum sampling rate supported by the AD976ACNZ?
The AD976ACNZ supports a maximum throughput rate of 200 kSPS, corresponding to a minimum conversion cycle time of 5 µs. This is achieved using the internal clock and confirmed under –40°C to +85°C operating conditions with VANA = VDIG = +5 V and internal reference enabled. The AD976ACNZ achieves this speed without external clocking circuitry due to its integrated oscillator.
Does the AD976ACNZ require an external reference voltage?
No, the AD976ACNZ does not require an external reference voltage because it integrates a factory-trimmed 2.5 V internal reference with ±0.02 V tolerance. However, the REF pin can accept an external 2.3 V to 2.7 V reference if higher precision or custom scaling is needed - in which case the internal reference is disabled automatically.
How is the AD976ACNZ different from the AD976CN?
The AD976ACNZ is the 200 kSPS version (A-grade) in PDIP packaging, whereas the AD976CN is the 100 kSPS version (C-grade) in the same package. Key differences include throughput (200 vs. 100 kSPS), INL (±2 vs. ±3 LSB), and S/(N+D) performance (83 dB vs. 83 dB at lower frequency). Both share identical pinout, interface, and ±10 V input range.
Can the AD976ACNZ operate from a single 3.3 V supply?
No, the AD976ACNZ requires separate +5 V analog (VANA) and digital (VDIG) supplies, each regulated between 4.75 V and 5.25 V. Operation at 3.3 V is not supported - attempting to do so will result in undefined behavior, failure to meet AC/DC specifications, and potential damage due to violation of absolute maximum ratings.
What does the BYTE pin do on the AD976ACNZ?
The BYTE pin on the AD976ACNZ configures the 16-bit parallel data bus output format: when BYTE = LOW, D15–D0 appear on pins 6–22 in standard order; when BYTE = HIGH, the upper and lower bytes are swapped - D15–D8 appear on pins 15–22 and D7–D0 on pins 6–13 - enabling compatibility with 8-bit microcontrollers that read data in two cycles.
AD976ACNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 200k
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD976ACNZ FAQ
1.How can I place an order for AD976ACNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD976ACNZ 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 AD976ACNZ reliable?
The price and inventory of AD976ACNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD976ACNZ is usually 5 days.
3.What payment methods are accepted for AD976ACNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD976ACNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD976ACNZ?
AD976ACNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD976ACNZ 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 AD976ACNZ?
For technical support, including AD976ACNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD976ACNZ requirements.
6.How does Aetrix verify that AD976ACNZ is sourced from the original manufacturer or authorized distributors?
All AD976ACNZ 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 AD976ACNZ meets industry standards.
7.What is the process for return or replacement of AD976ACNZ?
All AD976ACNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD976ACNZ, 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 AD976ACNZ part is unused and in its original packaging.
Return procedure for AD976ACNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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