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Analog Devices Inc. AD976ACN
- Part No.:
- AD976ACN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD976ACN.pdf
- Description:
- IC ADC 16BIT 200KSPS 28-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,086
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Product details
Overview
AD976ACN 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, on-chip clock, and high-speed parallel 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 AD976ACN datasheet, AD976ACN pinout, AD976ACN application, or AD976ACN equivalent, this page delivers verified technical context, exact package mapping (28-lead PDIP), confirmed pin functions, real-world timing behavior (4.0 µs conversion time), and validated alternatives for ±10 V, 200 kSPS sampling systems.
Technical Context
The AD976ACN implements a capacitor-array-based successive-approximation ADC architecture-eliminating laser-trimmed resistor ladders-to achieve stable linearity across temperature. It integrates factory-calibrated thin-film ROM coefficients to correct capacitor mismatches and includes on-chip offset/gain trimming circuitry.
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. Digital timing is controlled via R/C and CS inputs, supporting both continuous and command-triggered conversion modes with BUSY-synchronized data 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 5 µs minimum inter-conversion interval for real-time control loops |
| Analog Input Range | ±10 V - standard industrial bipolar range, supported by internal 2.5 V reference (±4×REF) |
| DC Accuracy (INL) | ±3 LSB (C-grade) - ensures monotonicity and <0.005% full-scale linearity error |
| AC Performance (S/(N+D)) | 83 dB at 45 kHz - corresponds to ~14-bit effective resolution for medium-bandwidth signals |
| Power Dissipation | 100 mW max - compatible with thermally constrained embedded enclosures and multi-channel DAQ systems |
| Digital Interface | Parallel 16-bit, binary two's complement - directly interfaces with DSPs and microcontrollers without glue logic |
Pinout & Package
AD976ACN is housed in a 28-lead, 300 mil plastic DIP (PDIP) package (Ordering Code N-28B), with 0.3 inch body width and through-hole mounting. Pin 1 is located at the left end of the top row when viewed from above with notch or dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Analog input | Accepts ±10 V differential signal referenced to AGND1; protected to ±25 V |
| AGND1 (Pin 2) | Analog ground (low-current) | Reference return for REF and VIN; must be isolated from power/switching noise |
| REF (Pin 3) | Reference I/O | Provides internal 2.5 V reference or accepts external 2.3–2.7 V source; requires 2.2 µF cap to AGND1 |
| CAP (Pin 4) | Reference buffer output | Stabilizes internal reference; requires 2.2 µF tantalum capacitor to AGND2 |
| AGND2 (Pin 5) | Analog ground (high-current) | Return path for CAP and internal reference buffer; separate from AGND1 to minimize coupling |
| D15–D0 (Pins 6,7–13,15–22,22) | Parallel digital output | 16-bit two's complement data bus; high-impedance when CS = HIGH or R/C = LOW |
| BYTE (Pin 23) | Data bus configuration | Selects full 16-bit mode (BYTE = LOW) or byte-swapped 8-bit mode (BYTE = HIGH) |
| R/C (Pin 24) | Read/Convert control | Falling edge initiates conversion; rising edge enables data output (when CS = LOW) |
| CS (Pin 25) | Chip select | Enables device; falling edge triggers conversion or data read depending on R/C state |
| BUSY (Pin 26) | Status indicator | Active-low open-drain output signaling conversion in progress; rising edge marks data validity |
| VANA (Pin 27) | Analog supply | +5 V ±5% analog power rail; decoupling required near pin for noise-sensitive operation |
| VDIG (Pin 28) | Digital supply | +5 V ±5% digital power rail; separate from VANA to prevent digital switching noise injection |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-array SAR architecture | Eliminates resistor-ladder thermal drift, enabling stable INL over –40°C to +85°C |
| Factory-calibrated ROM coefficients | Corrects capacitor mismatch errors in real time during conversion, reducing post-calibration effort |
| Integrated 2.5 V reference + on-chip clock | Reduces BOM count by 2 components and eliminates external oscillator layout sensitivity |
| Dual analog ground separation (AGND1/AGND2) | Prevents reference buffer current from modulating VIN reference point, preserving DC accuracy |
| ±25 V input overvoltage protection | Withstands transient surges common in industrial field wiring without external clamping diodes |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous monitoring of 4–20 mA loop outputs, thermocouple voltages, and strain gauge bridges in PLC-controlled plants. IC Role / Device Role / Timing Role: Precision digitizer capturing slow-varying analog signals at 200 kSPS with ±10 V range and 16-bit resolution. Use Value: Enables direct connection to sensor conditioning amps without level-shifting; 83 dB S/(N+D) supports >14-bit effective resolution for calibration-grade measurements. |
Use Scenario: High-accuracy stimulus-response testing of analog circuits, including op amp THD/SNR validation and filter characterization. IC Role / Device Role / Timing Role: Reference-grade ADC capturing fast transient waveforms synchronized to pattern generators via BUSY-driven latch timing. Use Value: 4.0 µs conversion time and BUSY-rising-edge data valid window allow deterministic sampling alignment with test stimuli. |
| Medical Data Acquisition | Scientific Instrumentation |
|
Use Scenario: Digitizing ECG, EEG, and pressure transducer outputs in portable diagnostic devices requiring low power and high DC fidelity. IC Role / Device Role / Timing Role: Low-noise, single-supply ADC interfacing to instrumentation amplifiers with minimal external components. Use Value: 100 mW max power and integrated reference reduce thermal load and PCB area-critical for battery-powered handheld units. |
Use Scenario: Signal capture in spectrum analyzers, lock-in amplifiers, and laser interferometry systems demanding stable linearity and low aperture jitter. IC Role / Device Role / Timing Role: High-stability SAR ADC providing repeatable amplitude measurement across temperature and supply variation. Use Value: ±7 ppm/°C full-scale drift and ±2 ppm/°C bipolar zero drift ensure <0.01% gain/offset drift over operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit, 200 kSPS SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | SAR ADC with 1 MSPS throughput, SPI interface, no internal reference, 1.8 V supply | Requires external reference and level-shifting for ±10 V input; suited for high-speed, low-voltage embedded systems | Choose ADS8860IDRCT for higher throughput and lower power in new designs where SPI is acceptable and ±10 V support can be added externally |
| MAX1190ECM+ | 16-bit, 200 kSPS SAR ADC with internal reference, parallel interface, but only ±5 V input range | Limited to unipolar or reduced-range bipolar signals; lacks ±25 V overvoltage protection | Choose MAX1190ECM+ only if system input stays within ±5 V and overvoltage robustness is not required |
Compared with ADS8860IDRCT and MAX1190ECM+, the AD976ACN uniquely combines ±10 V input, internal reference, on-chip clock, and 28-pin DIP packaging-making it irreplaceable in legacy industrial DAQ upgrades where board space, supply voltage, and analog range constraints match its fixed architecture.
Availability
AD976ACN is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical data acquisition, and scientific instrumentation requiring stable component supply across long product lifecycles.
Supply support for AD976ACN 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 designed as a complete, single-supply 16-bit SAR ADC solution for precision data acquisition systems needing factory-calibrated linearity, integrated reference, and robust industrial interface compatibility.
FAQ
What is the maximum sampling rate of the AD976ACN?
The AD976ACN achieves a guaranteed 200 kSPS throughput rate, corresponding to a 5 µs minimum time between conversions. This is specified for the C-grade version across the full –40°C to +85°C temperature range with internal reference and VANA = VDIG = +5 V. The actual conversion time is 4.0 µs, with BUSY returning high 180 ns after completion.
Does the AD976ACN require an external reference?
No-the AD976ACN includes a factory-trimmed 2.5 V internal reference accessible at the REF pin. It can operate fully autonomously with this reference. An external 2.3–2.7 V reference may be applied to REF to override the internal source, but it is not required. The AD976ACN datasheet confirms internal reference performance meets all AC/DC specifications.
What package type is used for the AD976ACN?
The AD976ACN uses a 28-lead, 300 mil plastic DIP (dual in-line package), designated as N-28B in Analog Devices' ordering guide. It is a through-hole, leaded package with 0.3 inch body width and standard 0.1 inch pin pitch-compatible with legacy prototyping, manual assembly, and industrial backplane designs.
How does the BYTE pin affect data output on the AD976ACN?
The BYTE pin configures the 16-bit parallel output format: when BYTE = LOW, D15 (MSB) appears on Pin 6 and D0 (LSB) on Pin 22; when BYTE = HIGH, the upper and lower bytes swap-D15–D8 appear on Pins 15–22 and D7–D0 on Pins 6–13. This allows flexible interfacing with 8-bit microcontrollers or memory-mapped peripherals without external multiplexing.
Can the AD976ACN handle input signals beyond ±10 V?
Yes-the AD976ACN analog input (VIN) is rated for ±25 V absolute maximum, providing robust overvoltage protection. While full-scale accuracy is specified only for ±10 V, the device recovers to full performance within 150 ns after a 2× full-scale (±20 V) overvoltage event, per the datasheet's overvoltage recovery specification.
AD976ACN 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:
- -
- Input Type:
- -
- Data Interface:
- Parallel
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD976ACN FAQ
1.How can I place an order for AD976ACN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD976ACN 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 AD976ACN reliable?
The price and inventory of AD976ACN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD976ACN is usually 5 days.
3.What payment methods are accepted for AD976ACN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD976ACN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD976ACN?
AD976ACN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD976ACN 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 AD976ACN?
For technical support, including AD976ACN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD976ACN requirements.
6.How does Aetrix verify that AD976ACN is sourced from the original manufacturer or authorized distributors?
All AD976ACN 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 AD976ACN meets industry standards.
7.What is the process for return or replacement of AD976ACN?
All AD976ACN units undergo pre-shipment inspection (PSI). If there is an issue with AD976ACN, 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 AD976ACN part is unused and in its original packaging.
Return procedure for AD976ACN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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