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Analog Devices Inc. AD976AAN
- Part No.:
- AD976AAN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD976AAN.pdf
- Description:
- IC ADC 16BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,856
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Product details
Overview
AD976AAN from Analog Devices is a 16-bit, 200 kSPS BiCMOS successive-approximation analog-to-digital converter (ADC) with ±10 V bipolar input range, internal 2.5 V reference, and parallel 16-bit twos-complement output interface. It operates from a single +5 V supply, dissipates ≤100 mW, and targets precision data acquisition in industrial instrumentation and automated test equipment.
For engineers reviewing the AD976AAN datasheet, AD976AAN pinout, AD976AAN application, or AD976AAN equivalent, key selection considerations include its 200 kSPS throughput, ±10 V input compliance, factory-calibrated INL (±3 LSB max), on-chip clock, and 28-lead PDIP package compatibility with legacy DIP-based signal chain designs.
Technical Context
The AD976AAN implements a switched-capacitor SAR architecture with laser-trimmed scaling resistors and on-chip capacitor array charge redistribution-eliminating external sample/hold circuitry and minimizing temperature-induced linearity drift. Calibration coefficients stored in thin-film ROM correct capacitor mismatches during conversion.
It features dual analog grounds (AGND1 for REF/VIN reference, AGND2 for CAP), separate analog (VANA) and digital (VDIG) 5 V supplies, and supports both internal 2.5 V reference (±0.2% tolerance) and external reference inputs (2.3–2.7 V). The BYTE pin enables full 16-bit or byte-swapped 8-bit parallel readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 305 µV LSB step size over ±10 V full-scale range |
| Throughput Rate | 200 kSPS - enables real-time sampling of signals up to 70 kHz bandwidth (Nyquist) |
| Analog Input Range | ±10 V - standard industrial bipolar range, supported by 13 kΩ input impedance and 22 pF capacitance |
| DC Accuracy (INL) | ±3 LSB max - factory-calibrated integral nonlinearity ensures monotonicity and no missing codes |
| AC Performance (S/(N+D)) | 83 dB at 45 kHz - corresponds to ~14-bit effective resolution under typical operating conditions |
| Power Dissipation | 100 mW max - low thermal load enables use in space-constrained industrial modules without forced cooling |
| Reference | Internal 2.5 V ±0.2% - eliminates need for external reference IC; external reference support adds flexibility |
Pinout & Package
AD976AAN is housed in a 28-lead plastic DIP (PDIP) package, 300 mil width, with through-hole mounting and industry-standard pin spacing. Pin 1 is located at the top-left corner when viewed from the top with notch or dot orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input | Accepts ±10 V bipolar signal via 200 Ω series resistor; referenced to AGND1 |
| AGND1 | Analog ground (low-current) | Reference ground for REF and VIN; must be isolated from high-current AGND2 |
| REF | Reference I/O | Provides internal 2.5 V reference or accepts external 2.3–2.7 V reference; requires 2.2 µF tantalum to AGND1 |
| CAP | Reference buffer output | Stabilizes internal reference; requires 2.2 µF tantalum to AGND2 |
| AGND2 | Analog ground (high-current) | Return path for CAP and internal reference buffer; separate from AGND1 to minimize noise coupling |
| D15–D0 | Parallel data outputs | 16-bit twos-complement output bus; high-impedance when CS = HIGH or R/C = LOW |
| BYTE | Data format control | LOW = D15 (MSB) on Pin 6, D0 (LSB) on Pin 22; HIGH = byte-swapped mapping for 8-bit microcontrollers |
| R/C | Read/Convert control | Falling edge initiates conversion; rising edge enables data output; minimum pulse width 50 ns |
| CS | Chip select | Active-low enable; OR'd internally with R/C; controls timing mode and output tri-state |
| BUSY | Status indicator | Active-low open-drain output signaling conversion in progress; rising edge marks data validity |
| VANA / VDIG | Analog/digital supplies | Separate +5 V (±5%) rails reduce supply coupling; each has dedicated decoupling requirement |
| DGND | Digital ground | Return for digital I/O; must be connected to system digital ground plane, isolated from analog grounds |
Key Features
| Feature | Design Value |
|---|---|
| Factory-calibrated SAR architecture | Eliminates post-manufacturing trimming; guarantees ±3 LSB INL and monotonic 16-bit operation across –40°C to +85°C |
| Integrated 2.5 V reference | Reduces BOM count and layout area; ±7 ppm/°C drift enables stable performance in unregulated environments |
| On-chip clock and timing control | Removes external clock generator; supports precise 5 µs conversion cycle (200 kSPS) with BUSY-synchronized readout |
| Dual analog ground separation | AGND1 (low-current) and AGND2 (high-current) isolation minimizes reference noise coupling and improves SNR by ≥3 dB |
| Overvoltage protection | Withstands ±25 V on VIN indefinitely; recovers to full accuracy within 150 ns after 2×FS overvoltage event |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous voltage/current monitoring of PLC analog I/O modules with ±10 V sensor interfaces. IC Role / Device Role / Timing Role: Primary 16-bit ADC capturing slow-varying process variables at 200 kSPS with guaranteed monotonicity. Use Value: Factory calibration ensures long-term stability without field recalibration; dual ground scheme suppresses noise from motor drives and solenoids. |
Use Scenario: Digitizing stimulus response waveforms in benchtop ATE systems requiring traceable DC accuracy. IC Role / Device Role / Timing Role: High-fidelity acquisition front-end for calibration-grade measurements with 83 dB S/(N+D) at 45 kHz. Use Value: Internal reference and on-chip clock simplify timing design; BYTE pin enables seamless integration with 8-bit controller-based test sequencers. |
| Medical Data Acquisition | Energy Metering Reference Channel |
Use Scenario: Isolated ECG/EEG signal digitization where low THD (–90 dB) and spurious-free dynamic range (>90 dB) preserve diagnostic fidelity. IC Role / Device Role / Timing Role: Precision bipolar ADC interfacing to isolated instrumentation amplifiers in Class II medical devices. Use Value: ±10 V input range matches clinical sensor outputs; 100 mW power envelope supports fanless enclosure design. |
Use Scenario: High-accuracy voltage channel in polyphase energy meters verifying metrology IC performance against IEC 62053-22 Class 0.2 standards. IC Role / Device Role / Timing Role: Calibration reference ADC validating metrology IC gain/offset drift over temperature and time. Use Value: Full-scale error drift ≤±7 ppm/°C and bipolar zero error ≤±15 mV ensure traceable accuracy across –25°C to +70°C operating range. |
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 |
|---|---|---|---|
| AD976BN | Same 28-lead PDIP package and ±10 V input, but rated for 100 kSPS throughput and 85 dB S/(N+D) | Lower speed and higher AC performance suit slower, higher-fidelity applications like vibration analysis | Select AD976BN only if throughput < 150 kSPS is acceptable and S/(N+D) > 83 dB is required |
| ADS8688IPWR | 16-bit, 500 kSPS SAR ADC with integrated programmable gain amplifier (PGA), SPI interface, and ±10.24 V input range | Replaces external signal conditioning; requires PCB redesign due to QFN-32 package and serial interface | Choose ADS8688IPWR for new designs needing higher speed, PGA flexibility, and smaller footprint-avoid for drop-in AD976AAN replacement |
Compared with AD976BN and ADS8688IPWR, the AD976AAN uniquely balances 200 kSPS throughput, ±10 V bipolar input, parallel interface, and PDIP packaging-making it irreplaceable in legacy industrial controllers where board space, interface compatibility, and thermal envelope constrain alternatives.
Availability
AD976AAN is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical data acquisition, and energy metering reference channel applications requiring stable component supply and long-lifecycle support.
Supply support for AD976AAN 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 AD976AAN belongs to Analog Devices' precision SAR ADC product line, designed specifically for industrial and instrumentation applications demanding DC accuracy, AC fidelity, and robustness in harsh electromagnetic environments.
FAQ
What is the maximum sampling rate supported by the AD976AAN?
The AD976AAN supports a maximum throughput rate of 200 kSPS, corresponding to a 5 µs conversion cycle time. This is confirmed in the AD976A–SPECIFICATIONS table and ordering guide, where AD976AAN is explicitly rated for 200 kSPS operation across all grades (A/B/C) and temperature range (–40°C to +85°C). The timing diagram Figure 2 shows BUSY low duration of 4.0 µs, enabling this sustained rate.
Does the AD976AAN require an external reference voltage?
No, the AD976AAN does not require an external reference voltage-it integrates a factory-trimmed 2.5 V reference with ±0.2% initial accuracy and ±7 ppm/°C drift. However, it supports external reference operation between 2.3 V and 2.7 V for applications needing tighter tolerance or custom scaling. When using the internal reference, a 2.2 µF tantalum capacitor must be placed between REF and AGND1, and between CAP and AGND2.
What package type is used for the AD976AAN?
The AD976AAN uses a 28-lead plastic DIP (PDIP) package, 300 mil width, designated as N-28B in the Ordering Guide. This through-hole package is compatible with legacy industrial PCB layouts and hand-soldering workflows. Pin configuration matches standard 28-pin DIP footprints, with VIN at Pin 1, AGND1 at Pin 2, REF at Pin 3, and VDIG at Pin 28.
How does the BYTE pin affect data output on the AD976AAN?
The BYTE pin on the AD976AAN selects between two parallel data formats: when BYTE is LOW, D15 (MSB) appears on Pin 6 and D0 (LSB) on Pin 22; when BYTE is HIGH, the upper and lower bytes are swapped-D15–D8 appear on Pins 15–22 and D7–D0 on Pins 6–13. This allows direct interfacing with both 16-bit and 8-bit microcontrollers without external multiplexing logic.
What is the analog input impedance and capacitance of the AD976AAN?
The AD976AAN has an analog input impedance of 13 kΩ and input capacitance of 22 pF, as specified in the AD976A–SPECIFICATIONS table under "ANALOG INPUT" for all grades. These values apply when using the internal reference (Figure 6); the input is resistive-dominant and requires a low-impedance drive source-Analog Devices recommends a 200 Ω series resistor between the signal source and VIN to optimize settling and linearity.
AD976AAN 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:
- -
AD976AAN FAQ
1.How can I place an order for AD976AAN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD976AAN 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 AD976AAN reliable?
The price and inventory of AD976AAN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD976AAN is usually 5 days.
3.What payment methods are accepted for AD976AAN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD976AAN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD976AAN?
AD976AAN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD976AAN 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 AD976AAN?
For technical support, including AD976AAN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD976AAN requirements.
6.How does Aetrix verify that AD976AAN is sourced from the original manufacturer or authorized distributors?
All AD976AAN 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 AD976AAN meets industry standards.
7.What is the process for return or replacement of AD976AAN?
All AD976AAN units undergo pre-shipment inspection (PSI). If there is an issue with AD976AAN, 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 AD976AAN part is unused and in its original packaging.
Return procedure for AD976AAN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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