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Analog Devices Inc. AD976AARSZ
- Part No.:
- AD976AARSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD976AARSZ.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,860
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Product details
Overview
AD976AARSZ from Analog Devices is a 16-bit, 200 kSPS BiCMOS successive-approximation analog-to-digital converter (ADC) with internal 2.5 V reference, ±10 V input range, and parallel 16-bit twos-complement output. 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 AD976AARSZ datasheet, AD976AARSZ pinout, AD976AARSZ application, or AD976AARSZ equivalent, this page delivers verified specifications, package mapping to 28-lead SSOP (RS-28), functional pin roles, real-world use cases, and validated alternative parts for design continuity and sourcing flexibility.
Technical Context
The AD976AARSZ 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 timing logic support deterministic conversion control via R/C and CS inputs.
It features dual ground separation (AGND1, AGND2, DGND), bipolar zero error ≤±10 mV, full-scale error drift ≤±7 ppm/°C, and supports both internal reference operation and external 2.3–2.7 V reference override - all while maintaining guaranteed no-missing-codes performance across –40°C to +85°C.
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 - enables 5 µs conversion cycle time for high-speed sampling applications |
| Analog Input Range | ±10 V - standard industrial bipolar range, supported by 13 kΩ input impedance and 22 pF capacitance |
| Reference | Internal 2.5 V ±20 mV - eliminates need for external reference IC unless higher accuracy or external control required |
| Power Dissipation | 100 mW max - enables thermally constrained designs with single 5 V supply (VDIG = VANA = 5 V) |
| DC Accuracy (INL) | ±3 LSB (A-grade) - ensures monotonicity and <15-bit effective linearity without post-calibration |
| AC Performance (S/(N+D)) | 83 dB at 45 kHz - corresponds to ~14-bit ENOB for medium-frequency signal digitization |
Pinout & Package
AD976AARSZ is housed in a 28-lead Shrink Small Outline Package (SSOP), designated RS-28, with 0.65 mm lead pitch and exposed pad-less construction. Pin layout follows standard Analog Devices 28-pin SSOP footprint compatible with JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input | Accepts ±10 V differential input referenced to AGND1; requires 200 Ω series resistor per datasheet |
| REF | Reference I/O | Supplies internal 2.5 V reference or accepts external 2.3–2.7 V reference; decoupled with 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 twos-complement output bus; high-impedance when CS HIGH or R/C LOW |
| BYTE | Data bus configuration | Selects full 16-bit mode (BYTE LOW) or byte-swapped 8-bit mode (BYTE HIGH) for microcontroller interface |
| R/C | Read/Convert control | Falling edge initiates conversion; rising edge enables data output latch (when CS LOW) |
| 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 signaling conversion in progress; rising edge marks data validity |
| VANA / VDIG | Analog/digital supplies | Separate 4.75–5.25 V rails minimize noise coupling; require independent 0.1 µF + bulk decoupling |
| AGND1 / AGND2 / DGND | Ground terminals | AGND1 references REF/VIN; AGND2 references CAP; DGND isolated for digital return path |
Key Features
| Feature | Design Value |
|---|---|
| On-chip calibrated capacitor array | Eliminates external S/H circuitry and resistor-ladder matching errors; enables stable INL over temperature |
| Factory-trimmed offset & gain | Reduces need for system-level calibration; A-grade guarantees ≤±10 mV bipolar zero error and ≤±0.5% full-scale error |
| Single 5 V supply operation | Simplifies power architecture - no ±15 V or separate analog/digital regulators required |
| High-speed parallel interface | 83 ns bus access/relinquish timing supports direct connection to DSPs and microcontrollers without glue logic |
| Overvoltage protection | Withstands ±25 V on VIN - protects against transient faults in industrial sensor interfaces |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA loop signals conditioned to ±10 V range in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC capturing sensor voltage outputs at up to 200 kSPS with deterministic BUSY-driven read timing. Use Value: Guaranteed no-missing-codes and ±3 LSB INL ensure accurate representation of slow-varying process variables without interpolation artifacts. |
Use Scenario: High-fidelity waveform capture in benchtop multimeters and parametric testers requiring >14-bit ENOB at 45 kHz. IC Role / Device Role / Timing Role: Precision front-end ADC synchronized to system clock via R/C and CS; BYTE pin enables flexible data capture on 8-bit buses. Use Value: 83 dB S/(N+D) and –90 dB THD support measurement resolution beyond 14 bits for mid-frequency AC parameter validation. |
| Medical Data Acquisition | Energy Metering Reference Calibration |
Use Scenario: Digitizing ECG/EEG amplifier outputs in portable diagnostic devices where low power and bipolar input range are critical. IC Role / Device Role / Timing Role: Low-noise, single-supply ADC interfacing directly to instrumentation amplifiers; AGND1/AGND2 isolation preserves signal integrity. Use Value: 100 mW max dissipation and internal reference reduce thermal drift and component count in battery-powered systems. |
Use Scenario: Calibration-grade voltage sampling in polyphase energy meters verifying metrology IC accuracy against traceable standards. IC Role / Device Role / Timing Role: High-linearity reference ADC used to validate gain/offset of primary metering ICs under controlled lab conditions. Use Value: ±7 ppm/°C full-scale drift and factory calibration enable stable reference measurements across temperature-cycled calibration cycles. |
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 | Requires level-shifting and external reference; better suited for low-power, high-throughput embedded systems | Choose for modern low-voltage designs needing faster throughput and smaller footprint - not pin-compatible |
| MAX1190ECM+ | 16-bit, 100 kSPS, parallel interface, ±5 V input range, internal reference, 28-pin SOIC | Limited to ±5 V input; lower throughput; same package but different pinout and timing behavior | Consider for legacy ±5 V systems where AD976AARSZ's ±10 V range is unnecessary and cost sensitivity is high |
Compared with ADS8860IDRCT and MAX1190ECM+, the AD976AARSZ uniquely combines ±10 V bipolar input, 200 kSPS parallel throughput, internal reference, and SSOP packaging - making it irreplaceable in industrial DAQ systems requiring direct compatibility with legacy 4–20 mA conditioning and minimal BOM changes.
Availability
AD976AARSZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical data acquisition, and energy metering reference calibration requiring stable component supply and long-term obsolescence management.
Supply support for AD976AARSZ 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, founded in 1965 and headquartered in Wilmington, MA.
The AD976AARSZ belongs to Analog Devices' precision SAR ADC product line, engineered for high-accuracy, low-power, single-supply data acquisition in industrial, instrumentation, and medical applications where reliability and DC/AC specification integrity are critical.
FAQ
What is the maximum sampling rate supported by the AD976AARSZ?
The AD976AARSZ supports a maximum throughput rate of 200 kSPS, corresponding to a 5 µs conversion cycle time. This is achieved using the internal clock and proper timing of the R/C and CS control signals as specified in the timing diagram - with BUSY going low for ~4 µs before returning high to indicate data validity. The AD976AARSZ maintains full AC and DC specifications at this rate when operated within its specified temperature and supply ranges.
Does the AD976AARSZ require an external reference voltage?
No, the AD976AARSZ does not require an external reference voltage because it integrates a factory-calibrated 2.5 V internal reference with ±20 mV tolerance and ±7 ppm/°C drift. However, an external 2.3–2.7 V reference can be applied to the REF pin to improve accuracy or enable system-level reference synchronization - in which case the internal reference is disabled and external current drain is 100 µA.
What package type is used for the AD976AARSZ?
The AD976AARSZ uses a 28-lead Shrink Small Outline Package (SSOP), designated RS-28 per Analog Devices' ordering guide. It has a 0.65 mm lead pitch, conforms to JEDEC MO-153, and is distinct from the larger SOIC (R-28) and PDIP (N-28B) variants - requiring specific PCB footprint and reflow profile validation.
How is the AD976AARSZ interfaced to a microcontroller with an 8-bit data bus?
The AD976AARSZ supports 8-bit interface via the BYTE pin: when BYTE is driven HIGH, D15–D8 appear on pins 15–22 and D7–D0 on pins 6–13, enabling sequential byte reads. Combined with CS and R/C timing, this allows straightforward connection to 8-bit MCUs without external latches - though designers must observe t9 (bus relinquish time ≤83 ns) and manage BUSY-driven handshaking for reliable data capture.
What is the meaning of "no missing codes" for the AD976AARSZ?
"No missing codes" means that the AD976AARSZ guarantees monotonic transfer function across its entire 16-bit range - every possible 16-bit output code from 0x0000 to 0xFFFF appears for some input voltage within the ±10 V range. This is ensured by differential nonlinearity (DNL) ≤±1 LSB, preventing code skips that would cause ambiguity in control or measurement loops - a requirement explicitly verified during production testing per the datasheet.
AD976AARSZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD976AARSZ FAQ
1.How can I place an order for AD976AARSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD976AARSZ 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 AD976AARSZ reliable?
The price and inventory of AD976AARSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD976AARSZ is usually 5 days.
3.What payment methods are accepted for AD976AARSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD976AARSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD976AARSZ?
AD976AARSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD976AARSZ 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 AD976AARSZ?
For technical support, including AD976AARSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD976AARSZ requirements.
6.How does Aetrix verify that AD976AARSZ is sourced from the original manufacturer or authorized distributors?
All AD976AARSZ 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 AD976AARSZ meets industry standards.
7.What is the process for return or replacement of AD976AARSZ?
All AD976AARSZ units undergo pre-shipment inspection (PSI). If there is an issue with AD976AARSZ, 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 AD976AARSZ part is unused and in its original packaging.
Return procedure for AD976AARSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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