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Analog Devices Inc. AD976ARS
- Part No.:
- AD976ARS
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD976ARS.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,990
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Product details
Overview
AD976ARS from Analog Devices is a 16-bit, 100 kSPS BiCMOS successive-approximation analog-to-digital converter with ±10 V input range, internal 2.5 V reference, 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 AD976ARS datasheet, AD976ARS pinout, AD976ARS application, or AD976ARS equivalent, key selection considerations include its 100 kSPS throughput, ±10 V bipolar input compliance, 83 dB signal-to-(noise + distortion), 28-lead SSOP package, and factory-calibrated DC linearity (±3 LSB INL).
Technical Context
The AD976ARS implements a switched-capacitor SAR architecture with on-chip binary-weighted capacitor array, eliminating external sample-and-hold circuitry and minimizing temperature-induced resistor mismatch errors. Calibration coefficients are stored in thin-film resistors acting as ROM and applied dynamically during conversion.
It supports dual reference modes: internal 2.5 V reference (±0.2% accuracy) or external reference (2.3 V to 2.7 V). The parallel interface uses TTL/CMOS-compatible digital I/O with BYTE-selectable 16-bit or two 8-bit byte outputs, and timing is controlled via R/C and CS signals with BUSY status indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete codes for high dynamic range measurement |
| Analog Input Range | ±10 V - standard industrial bipolar range, compatible with legacy sensor and DAQ front-ends |
| Throughput Rate | 100 kSPS - enables real-time capture of signals up to 700 kHz full-power bandwidth |
| S/(N+D) | 83 dB typical - corresponds to ~13.5 effective bits at 100 kSPS with 20 kHz input |
| Integral Nonlinearity | ±3 LSB max - ensures monotonicity and <0.005% end-point linearity error |
| Power Dissipation | 100 mW max - supports thermally constrained PCB layouts without forced cooling |
| Reference | Internal 2.5 V ±0.2% - eliminates need for external reference IC, reducing BOM count |
Pinout & Package
AD976ARS is housed in a 28-lead Shrink Small Outline Package (SSOP), 5.6 mm × 13.9 mm body, 0.65 mm lead pitch, JEDEC MO-153 compliant. Thermal resistance θJA = 109°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog Input | ±10 V bipolar input node; requires 200 Ω series resistor for overvoltage protection and drive impedance matching |
| REF | Reference I/O | Provides internal 2.5 V reference or accepts external 2.3–2.7 V reference; must be decoupled to AGND1 with 2.2 µF tantalum |
| CAP | Reference Buffer Output | Stabilizes internal reference; requires 2.2 µF tantalum capacitor to AGND2 |
| D15–D0 | Parallel Data Outputs | 16-bit twos-complement digital output; high-impedance when CS HIGH or R/C LOW |
| BYTE | Data Bus Configuration | Selects full 16-bit output (BYTE LOW) or split 8-bit byte mode (BYTE HIGH) for microcontroller bus alignment |
| R/C | Read/Convert Control | Falling edge initiates conversion; rising edge enables data output; defines sampling trigger point |
| CS | Chip Select | Enables device and controls data bus access; OR'd internally with R/C for flexible timing control |
| BUSY | Status Output | Active-low open-drain signal indicating conversion in progress; rising edge marks data validity |
| VANA / VDIG | Power Supplies | Separate analog (+5 V) and digital (+5 V) supplies reduce noise coupling; each has dedicated ground (AGND1/AGND2, DGND) |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Calibrated SAR Architecture | Eliminates external trimming components; achieves ±3 LSB INL and ±2 LSB DNL without user calibration |
| Integrated Reference & Clock | Reduces system-level component count by removing external reference IC and clock generator |
| Single +5 V Supply Operation | Enables direct integration into 5 V logic systems without auxiliary voltage rails or level shifters |
| Overvoltage Protected Analog Input | Withstands ±25 V transients, supporting robust field deployment in noisy industrial environments |
| Hi-Z Parallel Interface with BYTE Control | Supports both 16-bit wide and 8-bit nibble-based microcontroller interfaces without glue logic |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing ±10 V sensor signals at 100 kSPS for real-time closed-loop feedback. Use Value: Factory-calibrated linearity ensures <0.005% measurement uncertainty across –40°C to +85°C without recalibration. |
Use Scenario: Digitizing stimulus response waveforms during functional testing of mixed-signal boards. IC Role / Device Role / Timing Role: High-fidelity acquisition stage synchronized to test pattern generator clocks via R/C and BUSY handshake. Use Value: 83 dB S/(N+D) and 90 dB SFDR enable accurate characterization of DAC linearity and amplifier THD. |
| Medical Instrumentation | Energy Metering Reference Design |
Use Scenario: ECG and EEG front-end digitization requiring low-noise, bipolar input capability. IC Role / Device Role / Timing Role: Precision analog input channel converting differential biopotential signals conditioned by instrumentation amplifiers. Use Value: Bipolar zero error ≤±15 mV and 2.5 V internal reference ensure accurate baseline recovery without offset drift compensation. |
Use Scenario: High-accuracy voltage and current sampling in Class 0.2 polyphase energy meters. IC Role / Device Role / Timing Role: Metrology-grade ADC interfaced to isolation amplifiers for mains voltage sensing. Use Value: ±10 V input range directly accommodates isolated ±5 V output sensors; 100 mW dissipation supports sealed meter enclosures. |
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 supply | Higher speed but no internal reference or ±10 V input; requires level-shifting and external ref design | Choose for battery-powered portable instruments needing higher throughput and lower power |
| MAX11270ETJ+ | 16-bit, 10 kSPS, delta-sigma architecture, 2.5 V internal reference, ±5 V input range | Lower speed, higher resolution (24-bit capable), no ±10 V support; better noise performance at low frequencies | Choose for high-precision DC/low-frequency measurements where ±10 V range is not required |
Compared with ADS8860IDRCT and MAX11270ETJ+, the AD976ARS uniquely combines ±10 V input, internal 2.5 V reference, and 100 kSPS throughput in a single-supply 28-pin SSOP-making it optimal for retrofitting legacy 5 V industrial systems without redesigning reference or interface circuitry.
Availability
AD976ARS is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical instrumentation, and energy metering requiring stable component supply and long-term obsolescence management.
Supply support for AD976ARS 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 DSP ICs, serving industrial, communications, and automotive markets since 1965.
The AD976ARS belongs to Analog Devices' precision SAR ADC product line, designed specifically for high-accuracy, medium-speed data acquisition in harsh industrial environments with minimal external components.
FAQ
What is the maximum sampling rate supported by the AD976ARS?
The AD976ARS supports a maximum throughput rate of 100 kSPS, corresponding to a complete 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) of the AD976ARS. The AD976A variant offers 200 kSPS, but AD976ARS is the 100 kSPS version.
Does the AD976ARS require an external reference voltage?
No, the AD976ARS includes a factory-trimmed internal 2.5 V reference (2.48 V to 2.52 V) that meets specified linearity and drift performance. An external reference (2.3 V to 2.7 V) may be used instead, but it is not required. The internal reference simplifies design and reduces bill-of-materials cost for the AD976ARS.
What package type is used for the AD976ARS?
The AD976ARS is packaged in a 28-lead Shrink Small Outline Package (SSOP), also designated RS-28 per the Analog Devices ordering guide. Its dimensions are 5.6 mm × 13.9 mm with 0.65 mm lead pitch, and it complies with JEDEC MO-153 standards.
How is the analog input protected on the AD976ARS?
The AD976ARS analog input (VIN) features ±25 V absolute maximum rating and integrated overvoltage protection. When used with the recommended 200 Ω series resistor (per Figure 5), it withstands transient overvoltages common in industrial settings while maintaining specified linearity and accuracy.
Can the AD976ARS interface directly with a 3.3 V microcontroller?
No-the AD976ARS digital I/O is designed for 5 V TTL/CMOS logic levels (VIH ≥ +2.0 V, VOL ≤ +0.4 V), and its outputs swing from 0 V to VDIG (nominally +5 V). Direct connection to a 3.3 V microcontroller risks damaging the MCU inputs; level translation or buffering is required for safe interfacing.
AD976ARS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm 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-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD976ARS FAQ
1.How can I place an order for AD976ARS through Aetrix?
Please submit a Request for Quotation (RFQ) for AD976ARS 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 AD976ARS reliable?
The price and inventory of AD976ARS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD976ARS is usually 5 days.
3.What payment methods are accepted for AD976ARS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD976ARS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD976ARS?
AD976ARS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD976ARS 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 AD976ARS?
For technical support, including AD976ARS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD976ARS requirements.
6.How does Aetrix verify that AD976ARS is sourced from the original manufacturer or authorized distributors?
All AD976ARS 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 AD976ARS meets industry standards.
7.What is the process for return or replacement of AD976ARS?
All AD976ARS units undergo pre-shipment inspection (PSI). If there is an issue with AD976ARS, 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 AD976ARS part is unused and in its original packaging.
Return procedure for AD976ARS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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