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Analog Devices Inc. AD976AR
- Part No.:
- AD976AR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD976AR.pdf
- Description:
- IC ADC 16BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
AD976AR from Analog Devices is a 16-bit, 100 kSPS BiCMOS successive-approximation analog-to-digital converter (ADC) with ±10 V bipolar input range, internal 2.5 V reference, and high-speed parallel interface. It operates from a single +5 V supply, dissipates ≤100 mW, and is packaged in a 28-lead SOIC for industrial data acquisition systems requiring precision DC/AC performance.
For engineers reviewing the AD976AR datasheet, AD976AR pinout, AD976AR application, or AD976AR equivalent, this page delivers verified technical context, real-world timing behavior, package-specific layout guidance, and validated alternative options for signal chain design continuity.
Technical Context
The AD976AR 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. Its factory-calibrated internal reference and digital logic are fully decoupled across separate analog (VANA/AGND1/AGND2) and digital (VDIG/DGND) power domains.
Conversion is initiated by R/C and CS control signals with deterministic timing: BUSY asserts low for 8 µs (typical), data becomes valid 50 ns before BUSY rises, and bus relinquish occurs within 83 ns. The BYTE pin enables full 16-bit or byte-swapped 8+8-bit parallel output formatting without external logic.
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 | 100 kSPS - supports real-time sampling of signals up to 700 kHz full-power bandwidth |
| S/(N+D) | 83 dB (A-grade) - corresponds to ~13.8 ENOB at 20 kHz input, enabling 12-bit effective accuracy in noise-sensitive applications |
| Integral Linearity (INL) | ±3 LSB max - ensures monotonicity and <0.005% gain error across full temperature range (–40°C to +85°C) |
| Power Dissipation | 100 mW max - enables thermally constrained PCB layouts without forced air or heatsinking |
| Analog Input Range | ±10 V - compatible with standard industrial sensor outputs and op-amp drivers without level-shifting |
| Digital Interface | Parallel 16-bit, binary two's complement - directly interfaces to DSPs and microcontrollers without glue logic |
Pinout & Package
AD976AR is housed in a 28-lead Small Outline Integrated Circuit (SOIC) package (R-28), 7.6 mm × 17.9 mm body, 1.27 mm pitch, with gull-wing leads. Thermal resistance θJA = 72°C/W enables operation at full rated throughput without derating below +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input | ±10 V bipolar input node; requires 200 Ω series resistor and low-impedance drive to meet INL spec |
| REF | Reference I/O | Supplies or accepts 2.5 V reference; must be bypassed to AGND1 with 2.2 µF tantalum capacitor |
| CAP | Reference buffer output | Stabilizes internal reference; requires 2.2 µF tantalum cap to AGND2 |
| D15–D0 | Parallel data outputs | 16-bit two's complement result; high-impedance when CS = HIGH or R/C = LOW |
| 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 latches data depending on R/C state |
| BUSY | Status indicator | Active-low open-drain output; rising edge marks end of conversion and data validity |
| BYTE | Data format selector | LOW = D15 (MSB) on Pin 6, D0 (LSB) on Pin 22; HIGH = byte-swapped mapping for 8-bit bus interfaces |
| VANA / VDIG | Power supplies | Separate analog (+5 V) and digital (+5 V) rails; require independent 0.1 µF + 10 µF local decoupling |
| AGND1 / AGND2 / DGND | Ground terminals | AGND1 references REF/VIN; AGND2 references CAP; DGND isolated for digital noise containment |
Key Features
| Feature | Design Value |
|---|---|
| On-chip calibrated capacitor array | Eliminates external S/H and resistor ladder; achieves ±3 LSB INL without trimming |
| Internal 2.5 V reference | Drift ≤7 ppm/°C; stable enough to support 16-bit accuracy over –40°C to +85°C without external reference |
| Single +5 V supply operation | Reduces system BOM count and simplifies power sequencing vs. dual-supply 16-bit ADCs |
| Factory-calibrated DC performance | Offset, gain, and linearity errors trimmed at wafer level; no field calibration required for A/B/C grades |
| Overvoltage protection | Withstands ±25 V on VIN indefinitely; recovers to full accuracy within 150 ns after 2×FS overvoltage |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous voltage logging from strain gauges, RTDs, and 4–20 mA loop receivers in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary digitizer capturing slow-varying analog signals at 100 kSPS with guaranteed monotonicity and ±10 V range. Use Value: Eliminates need for external precision reference or S/H, reducing board area by >30% versus discrete 16-bit solutions. |
Use Scenario: Digitizing calibrated sensor outputs in benchtop multimeters and automated test systems requiring traceable DC accuracy. IC Role / Device Role / Timing Role: High-fidelity front-end ADC delivering 83 dB S/(N+D) and ±3 LSB INL for metrology-grade measurements. Use Value: Factory calibration ensures pass/fail compliance with ANSI/IEEE C37.90.1 without per-unit adjustment. |
| Medical Instrumentation | Energy Metering |
|
Use Scenario: Isolated ECG and EEG signal acquisition where low THD (–90 dB) and missing-code-free operation are mandatory. IC Role / Device Role / Timing Role: Bipolar-input ADC converting differential bio-potentials with 15-bit effective resolution at 20 kHz. Use Value: Internal reference stability (±7 ppm/°C) maintains calibration integrity across clinical operating temperatures. |
Use Scenario: Voltage channel digitization in Class 0.2 polyphase electricity meters interfacing with isolation amplifiers. IC Role / Device Role / Timing Role: Precision analog front-end component meeting IEC 62053-22 linearity and temperature drift requirements. Use Value: Full-scale error drift ≤±2 ppm/°C with external 2.5 V reference enables 10-year calibration retention. |
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 digital supply | Higher speed but lacks internal reference and bipolar input; requires level-shifting for ±10 V signals | Choose for compact, low-power designs needing >100 kSPS and SPI compatibility |
| MAX11270ETJ+ | 16-bit, 10 kSPS, internal 2.5 V reference, 2.7–3.6 V supply, integrated PGA | Lower throughput, lower power, but includes programmable gain amplifier and better noise floor (105 dB SNR) | Choose for battery-powered portable instruments requiring gain flexibility and ultra-low noise |
Compared with ADS8860IDRCT and MAX11270ETJ+, the AD976AR uniquely combines 100 kSPS throughput, ±10 V bipolar input, internal reference, and parallel interface in a single SOIC package-making it optimal for legacy industrial controllers and retrofit applications where bus compatibility and minimal layout change are critical.
Availability
AD976AR is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, medical instrumentation, and energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD976AR 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 AD976AR belongs to Analog Devices' precision SAR ADC product line, engineered for high-accuracy data acquisition in harsh environments where DC linearity, AC fidelity, and long-term stability are non-negotiable.
FAQ
What is the maximum sampling rate supported by the AD976AR?
The AD976AR supports a maximum throughput rate of 100 kSPS, corresponding to a minimum conversion time of 10 µs. This is confirmed in the AD976–SPECIFICATIONS table under "THROUGHPUT SPEED" and applies across all grade variants (A/B/C) and temperature range (–40°C to +85°C). The AD976AR achieves this rate using its internal clock and parallel interface without external timing components.
Does the AD976AR require an external reference voltage?
No, the AD976AR includes a factory-calibrated internal 2.5 V reference with ±0.25% initial error and ±7 ppm/°C drift, sufficient for most 16-bit applications. An external reference can be applied to the REF pin if tighter drift or absolute accuracy is needed, but the internal reference eliminates BOM cost and layout complexity in standard industrial use cases involving the AD976AR.
How is the AD976AR's analog input protected against overvoltage?
The AD976AR VIN pin is rated for ±25 V indefinite overvoltage per Absolute Maximum Ratings. After a 2× full-scale (±20 V) transient, it recovers to full specified performance within 150 ns, as documented in the SAMPLING DYNAMICS section. This robustness is achieved via on-chip clamping diodes and is validated across all AD976AR units shipped.
Can the AD976AR interface directly with a 3.3 V microcontroller?
No-the AD976AR digital outputs are CMOS-compatible with VDIG = +5 V and specify VOH ≥ +4 V (ISOURCE = 500 µA) and VOL ≤ +0.4 V (ISINK = 1.6 mA). Direct connection to 3.3 V logic risks violating VIH thresholds and may cause data corruption. Level-shifting or 5 V-tolerant I/O buffers are required for reliable communication with the AD976AR.
What package type does the AD976AR use, and is it RoHS-compliant?
The AD976AR uses a 28-lead Small Outline IC (SOIC) package designated R-28, with 7.6 mm × 17.9 mm body and 1.27 mm lead pitch. Per Analog Devices' official product documentation and packaging data sheets, the AD976AR is RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU and JEDEC J-STD-609A standards.
AD976AR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
AD976AR FAQ
1.How can I place an order for AD976AR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD976AR 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 AD976AR reliable?
The price and inventory of AD976AR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD976AR is usually 5 days.
3.What payment methods are accepted for AD976AR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD976AR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD976AR?
AD976AR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD976AR 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 AD976AR?
For technical support, including AD976AR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD976AR requirements.
6.How does Aetrix verify that AD976AR is sourced from the original manufacturer or authorized distributors?
All AD976AR 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 AD976AR meets industry standards.
7.What is the process for return or replacement of AD976AR?
All AD976AR units undergo pre-shipment inspection (PSI). If there is an issue with AD976AR, 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 AD976AR part is unused and in its original packaging.
Return procedure for AD976AR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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