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Analog Devices Inc. AD976ABN
- Part No.:
- AD976ABN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD976ABN.pdf
- Description:
- IC ADC 16BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,876
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Product details
Overview
AD976ABN 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) on single +5 V supply.
For engineers reviewing the AD976ABN datasheet, AD976ABN pinout, AD976ABN application, or AD976ABN equivalent, this page delivers verified specifications, package mapping to 28-lead PDIP (N-28B), functional pin roles, real-world use cases, and two validated alternative parts - all grounded in Analog Devices' Rev. D datasheet and ordering guide.
Technical Context
The AD976ABN 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 in real time during conversion.
It features dual analog grounds (AGND1 for REF, AGND2 for CAP), separate analog (VANA) and digital (VDIG) 5 V supplies, and supports both internal 2.5 V reference and external reference operation with 2.3 V to 2.7 V compliance. The BYTE pin enables full 16-bit or byte-swapped 8-bit parallel output formatting.
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 | 200 kSPS - completes conversion in 5 µs, enabling real-time sampling of signals up to 700 kHz full-power bandwidth. |
| S/(N+D) | 85 dB typical - corresponds to ~14.2 effective number of bits (ENOB) at 45 kHz input, meeting high-fidelity measurement requirements. |
| Integral Nonlinearity | ±2.0 LSB max (B-grade) - ensures monotonicity and <15 ppm linearity error across –40°C to +85°C operating range. |
| Power Dissipation | 100 mW max - enables thermally constrained designs without heatsinking in industrial control modules. |
| Analog Input Range | ±10 V - standard industrial bipolar range, supported by 23 kΩ input impedance and 22 pF capacitance (AD976 series). |
| Reference | Internal 2.48–2.52 V ±1 µA source - eliminates need for external reference IC unless higher stability or external trimming is required. |
Pinout & Package
AD976ABN is housed in a 28-lead plastic DIP (PDIP) package, designated N-28B per Analog Devices' ordering guide. Pin spacing is 0.1 inch (2.54 mm), body width 0.3 inch (7.62 mm), and it is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Analog input node | Accepts ±10 V differential input referenced to AGND1; requires 200 Ω series resistor per datasheet Figure 5/6. |
| AGND1 (Pin 2) | Analog ground reference | Low-current return path for REF pin; must be isolated from high-current AGND2 and DGND to prevent noise coupling. |
| REF (Pin 3) | Reference I/O | Provides internal 2.5 V reference or accepts external 2.3–2.7 V reference; requires 2.2 µF tantalum cap to AGND1. |
| CAP (Pin 4) | Reference buffer output | Stabilizes internal reference; requires 2.2 µF tantalum cap to AGND2 - not connected to external reference mode. |
| AGND2 (Pin 5) | Analog ground return | Return for CAP and analog front-end biasing; kept separate from AGND1 to minimize reference feedthrough. |
| D15–D0 (Pins 6–13, 15–22, 22) | Parallel data outputs | 16-bit binary two's complement output; high-impedance when CS = HIGH or R/C = LOW; BYTE pin swaps MSB/LSB byte order. |
| BYTE (Pin 23) | Data format control | LOW: D15 (MSB) on Pin 6, D0 (LSB) on Pin 22; HIGH: D15–D8 on Pins 15–22, D7–D0 on Pins 6–13. |
| R/C (Pin 24) | Read/Convert control | Falling edge initiates conversion (with CS LOW); rising edge enables data output; timing-critical for 200 kSPS throughput. |
| CS (Pin 25) | Chip select | OR'd with R/C; falling edge starts conversion or enables output; HIGH forces all D[15:0] into high-Z state. |
| BUSY (Pin 26) | Conversion status indicator | Active-low open-drain output; goes LOW at conversion start and returns HIGH after data is latched - used as data-valid strobe. |
| VANA (Pin 27) | Analog power supply | +5 V ±5% analog supply; decoupled separately from VDIG to suppress digital switching noise on analog section. |
| VDIG (Pin 28) | Digital power supply | +5 V ±5% digital supply; powers logic, interface, and calibration circuitry; must be isolated from VANA. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-calibrated capacitor array | Eliminates need for external sample-and-hold; achieves ±2.0 LSB INL without user trimming under B-grade spec. |
| On-chip 2.5 V reference | Stable 2.48–2.52 V output with <1 µA sourcing capability - reduces BOM count and layout complexity in standalone DAQ systems. |
| Byte-selectable parallel interface | Enables compatibility with 8-bit microcontrollers via BYTE-controlled MSB/LSB reordering - no external glue logic required. |
| Single +5 V supply operation | Reduces system power architecture complexity; 100 mW max dissipation allows convection-cooled PCB placement in dense industrial enclosures. |
| ±25 V input overvoltage protection | Withstands transient surges beyond ±10 V full-scale without latch-up or parametric shift - critical for field-deployed sensor interfaces. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous voltage monitoring of motor drive feedback loops and PLC analog I/O modules. IC Role / Device Role / Timing Role: Primary 16-bit ADC capturing ±10 V sensor outputs at 200 kSPS for closed-loop control algorithms. Use Value: ±2.0 LSB INL and 85 dB S/(N+D) ensure accurate representation of small signal deviations within ±0.01% full-scale tolerance. |
Use Scenario: Digitizing calibrated reference signals in benchtop multimeters and waveform analyzers. IC Role / Device Role / Timing Role: High-accuracy acquisition stage preceding DSP-based FFT and harmonic analysis. Use Value: Factory-trimmed offset/gain and internal reference eliminate drift-related recalibration cycles during extended test sessions. |
| Medical Diagnostic Instrumentation | High-Voltage Power Supply Feedback |
|
Use Scenario: Acquisition of ECG/EEG front-end amplifier outputs in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, low-power ADC interfacing directly to instrumentation amplifiers with minimal external components. Use Value: 100 mW max power and dual AGND separation reduce thermal noise and common-mode interference in battery-powered units. |
Use Scenario: Closed-loop regulation of 1–10 kV DC power supplies via isolated voltage divider feedback. IC Role / Device Role / Timing Role: Isolated analog input digitization with ±25 V overvoltage tolerance protecting against transient spikes. Use Value: Robust input protection and ±10 V range match standard isolation amplifier outputs, avoiding signal scaling losses. |
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, identical accuracy grade. | Preferred where 100 kSPS suffices and cost sensitivity outweighs throughput need; shares same footprint and pinout. | Select AD976BN only if system sampling rate requirement is ≤100 kSPS - avoids over-specifying clock and interface bandwidth. |
| ADS8860IDRCT | 16-bit, 1 MSPS SAR ADC in 3x3 mm WSON package; requires external reference and separate analog/digital supplies; no on-chip clock. | Targets space-constrained, high-density PCBs; lacks integrated reference and internal clock - increases design overhead but improves speed. | Choose ADS8860IDRCT when board area is critical and system already provides precision reference and fast clock - not a drop-in replacement. |
Compared with AD976BN and ADS8860IDRCT, the AD976ABN uniquely combines 200 kSPS throughput, integrated 2.5 V reference, on-chip clock, and PDIP package - making it optimal for legacy industrial systems prioritizing ease of integration and thermal robustness over miniaturization.
Availability
AD976ABN is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and medical diagnostic instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD976ABN 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD976 family was engineered for high-accuracy, low-power data acquisition in industrial and instrumentation systems - emphasizing factory-calibrated linearity, single-supply operation, and integrated reference functionality.
FAQ
What is the maximum sampling rate supported by the AD976ABN?
The AD976ABN supports a maximum throughput rate of 200 kSPS, corresponding to a 5 µs conversion time. This is confirmed in the AD976A–SPECIFICATIONS table (Rev. D, p.2) and ordering guide entry for AD976ABN, which explicitly lists "200 kSPS" under Throughput Rate. The AD976ABN achieves this using its internal clock and successive-approximation architecture without requiring external timing components.
Does the AD976ABN require an external reference voltage?
No, the AD976ABN does not require an external reference voltage. It includes an internal 2.5 V reference (2.48–2.52 V) with ±1 µA sourcing capability, fully specified in the AD976A–SPECIFICATIONS table (Rev. D, p.2). External reference operation is optional and supported only within 2.3 V to 2.7 V - the AD976ABN functions autonomously with internal reference enabled by default.
What package type is used for the AD976ABN?
The AD976ABN uses a 28-lead plastic DIP (dual in-line package), designated N-28B in Analog Devices' ordering guide (Rev. D, p.5). This is a through-hole, 0.3-inch-wide package with 0.1-inch pin pitch - distinct from SOIC (R-28) and SSOP (RS-28) variants offered in the same family.
How is the AD976ABN's analog input protected against overvoltage?
The AD976ABN provides ±25 V absolute maximum rating on the VIN pin, as stated in the Absolute Maximum Ratings table (Rev. D, p.5). This protection is inherent to the BiCMOS process and internal ESD structures - no external clamping diodes are required for transients within this range. The device recovers fully within 150 ns after a 2× full-scale overvoltage event.
What is the guaranteed integral nonlinearity (INL) specification for the AD976ABN?
The AD976ABN is rated as a B-grade part, with guaranteed integral nonlinearity of ±2.0 LSB maximum across –40°C to +85°C, per the AD976A–SPECIFICATIONS table (Rev. D, p.2). This value is explicitly listed under "Integral Linearity Error" for AD976A, B-Grade row, and reflects worst-case deviation from ideal transfer function after factory calibration.
AD976ABN 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:
- -
AD976ABN FAQ
1.How can I place an order for AD976ABN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD976ABN 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 AD976ABN reliable?
The price and inventory of AD976ABN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD976ABN is usually 5 days.
3.What payment methods are accepted for AD976ABN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD976ABN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD976ABN?
AD976ABN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD976ABN 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 AD976ABN?
For technical support, including AD976ABN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD976ABN requirements.
6.How does Aetrix verify that AD976ABN is sourced from the original manufacturer or authorized distributors?
All AD976ABN 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 AD976ABN meets industry standards.
7.What is the process for return or replacement of AD976ABN?
All AD976ABN units undergo pre-shipment inspection (PSI). If there is an issue with AD976ABN, 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 AD976ABN part is unused and in its original packaging.
Return procedure for AD976ABN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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