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Analog Devices Inc. AD976CRS
- Part No.:
- AD976CRS
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD976CRS.pdf
- Description:
- IC ADC 16BIT 100KSPS 28-SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:338
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Product details
Overview
AD976CRS 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 parallel 16-bit twos-complement 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 AD976CRS datasheet, AD976CRS pinout, AD976CRS application, or AD976CRS equivalent, this page delivers verified specifications, package mapping to 28-lead SSOP (RS-28), functional pin roles, real-world use cases, and two validated alternative parts for design flexibility and supply continuity.
Technical Context
The AD976CRS uses a laser-trimmed capacitor array architecture-not resistor ladder-to eliminate temperature-induced linearity drift and enable factory calibration of offset, gain, and integral nonlinearity. Its on-chip sample/hold function requires no external components, and internal clocking simplifies system timing.
It supports both internal and external 2.5 V reference operation, features dual analog grounds (AGND1 for REF, AGND2 for CAP), and implements byte-selectable 16-bit parallel output (D15–D0 or split high/low byte mode) with BUSY-driven data latching.
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 | 100 kSPS - enables real-time sampling of signals up to 700 kHz full-power bandwidth |
| Integral Linearity Error | ±3 LSB max - ensures monotonicity and <15-bit effective linearity without missing codes |
| Analog Input Range | ±10 V - standard industrial bipolar range, supported by 23 kΩ input impedance and 22 pF capacitance |
| Power Dissipation | 100 mW max - compatible with thermally constrained embedded systems using single 5 V supply |
| Reference | Internal 2.5 V ±20 mV - eliminates need for external reference IC; external 2.3–2.7 V override supported |
| Digital Interface | Parallel 16-bit twos-complement - direct connection to DSP/microcontroller buses with BUSY-synchronized read timing |
Pinout & Package
AD976CRS is housed in a 28-lead Shrink Small Outline Package (SSOP), designated RS-28 per Analog Devices' ordering guide. This RoHS-compliant surface-mount package measures 10.2 mm × 5.3 mm × 1.95 mm with 0.65 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input | Accepts ±10 V bipolar signal via 200 Ω series resistor; protected to ±25 V |
| REF | Reference I/O | Supplies internal 2.5 V reference or accepts external 2.3–2.7 V source; requires 2.2 µF tantalum to AGND1 |
| CAP | Reference buffer output | Stabilizes internal reference; requires 2.2 µF tantalum to AGND2 |
| D15–D0 | Parallel data outputs | 16-bit twos-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 (with 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 |
| BYTE | Data format selector | LOW = D15 (MSB) on Pin 6, D0 (LSB) on Pin 22; HIGH = byte-swapped output mapping |
| VANA / VDIG | Analog/digital supplies | Separate 4.75–5.25 V rails minimize noise coupling; typical current draw 11 mA / 3 mA |
| AGND1 / AGND2 / DGND | Ground terminals | AGND1 references REF; AGND2 references CAP; star grounding recommended to avoid ground loops |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-array SAR architecture | Eliminates resistor-ladder thermal drift, enabling stable ±3 LSB INL over –40°C to +85°C |
| Factory-calibrated error correction | On-chip ROM stores trimming coefficients for offset, gain, and capacitor mismatch-no user calibration required |
| Integrated reference and clock | Reduces BOM count by removing external reference IC, oscillator, and sample/hold circuitry |
| Overvoltage recovery in 150 ns | Restores full accuracy within 150 ns after 2× full-scale transient, critical for fault-tolerant sensor interfaces |
| Byte-selectable parallel interface | Supports 16-bit wide or 8-bit nibble reads via BYTE pin-enables compatibility with 8-bit microcontrollers |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous voltage monitoring of PLC analog I/O modules with ±10 V sensor inputs (e.g., strain gauges, RTDs). IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog signals at 100 kSPS with deterministic BUSY-driven read timing. Use Value: 16-bit resolution and ±3 LSB INL ensure sub-0.01% measurement repeatability across temperature; internal reference removes drift-sensitive external components. |
Use Scenario: DC parametric testing of semiconductor devices requiring precise voltage/current digitization under programmable stimulus. IC Role / Device Role / Timing Role: High-accuracy front-end ADC synchronized to test controller via R/C and BUSY handshake. Use Value: 83 dB S/(N+D) and –90 dB THD support 14-bit ENOB at 20 kHz, meeting Class A ATE accuracy requirements without post-processing. |
| Medical Data Acquisition | Energy Metering Reference Design |
Use Scenario: Digitizing low-noise biopotential signals (ECG, EEG) amplified to ±10 V range in portable diagnostic units. IC Role / Device Role / Timing Role: Precision ADC operating from single 5 V rail, minimizing power supply complexity in battery-powered systems. Use Value: 100 mW max dissipation and internal reference reduce thermal load and calibration overhead-critical for compact, fanless enclosures. |
Use Scenario: High-fidelity voltage sampling in polyphase energy meters complying with IEC 62053-22 Class 0.2 accuracy. IC Role / Device Role / Timing Role: Metrology-grade ADC capturing voltage waveforms with minimal harmonic distortion for RMS and THD calculation. Use Value: –100 dB spurious-free dynamic range suppresses spectral artifacts from switching power supplies, ensuring clean FFT-based harmonic analysis. |
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 |
|---|---|---|---|
| AD976BR | Same 100 kSPS speed and RS-28 package, but ±2 LSB INL (B-grade) vs. ±3 LSB (C-grade) | Higher linearity tolerance required in metrology-grade calibration fixtures | Select AD976BR when <±2 LSB INL is mandatory; AD976CRS suffices for general-purpose industrial DAQ |
| ADS8688IPWR | 16-bit, 500 kSPS, SPI interface, integrated PGA and reference; no parallel bus or BYTE mode | Requires FPGA or MCU with SPI peripheral instead of parallel port; better suited for space-constrained PCBs | Choose ADS8688IPWR for higher throughput and smaller footprint; retain AD976CRS for legacy parallel-bus systems and deterministic BUSY timing |
Compared with AD976BR and ADS8688IPWR, the AD976CRS uniquely balances cost-effective C-grade performance, pin-compatible upgrade path within the AD976 family, and hardware-friendly parallel interface-making it optimal for retrofitting existing 16-bit data acquisition platforms without layout revision.
Availability
AD976CRS is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and medical data acquisition requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long production lifecycles.
Supply support for AD976CRS 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 digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD976 family was designed specifically for high-accuracy, single-supply data acquisition systems demanding 16-bit resolution, low power, and integrated reference functionality-targeting industrial, instrumentation, and test applications.
FAQ
What is the guaranteed integral nonlinearity (INL) specification for AD976CRS?
The AD976CRS is specified with ±3 LSB maximum integral nonlinearity error across its full operating temperature range (–40°C to +85°C). This C-grade performance is confirmed in the official AD976 datasheet Rev. D, Table "AD976–SPECIFICATIONS", and applies to all package variants including the RS-28 used in AD976CRS. The value reflects worst-case deviation from ideal transfer curve, ensuring monotonic behavior and no missing codes.
Does AD976CRS require an external reference, or does it include an internal one?
The AD976CRS includes a factory-trimmed internal 2.5 V reference (2.48 V to 2.52 V) that is fully functional and specified for linearity. An external reference between 2.3 V and 2.7 V may be applied at the REF pin to override the internal source, but it is not required. The internal reference eliminates the need for external reference ICs in most applications, reducing BOM count and board area.
What package type and dimensions does AD976CRS use?
AD976CRS uses the 28-lead Shrink Small Outline Package (SSOP), designated RS-28 by Analog Devices. Its dimensions are 10.2 mm × 5.3 mm × 1.95 mm with 0.65 mm lead pitch. This RoHS-compliant surface-mount package is distinct from the larger SOIC (R-28) and PDIP (N-28B) variants and is documented in the AD976 Ordering Guide for the "CRS" suffix.
How is data read from AD976CRS-what role does the BUSY signal play?
Data from AD976CRS is read synchronously using the BUSY signal: BUSY goes LOW at conversion start and returns HIGH when conversion completes and data is latched into the output register. Valid data appears on D15–D0 immediately after BUSY rises. This deterministic timing eliminates setup/hold uncertainty and allows reliable latching with the rising edge of BUSY-critical for interfacing with FPGAs or microcontrollers lacking dedicated ADC controllers.
Can AD976CRS operate from a single 5 V supply, and what are the supply current requirements?
Yes, AD976CRS operates from a single 5 V supply across both analog (VANA) and digital (VDIG) rails, with specified range 4.75 V to 5.25 V. Typical analog supply current is 11 mA; typical digital supply current is 3 mA. Total power dissipation remains ≤100 mW, enabling use in thermally constrained environments without forced cooling or complex power sequencing.
AD976CRS 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):
- 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-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD976CRS FAQ
1.How can I place an order for AD976CRS through Aetrix?
Please submit a Request for Quotation (RFQ) for AD976CRS 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 AD976CRS reliable?
The price and inventory of AD976CRS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD976CRS is usually 5 days.
3.What payment methods are accepted for AD976CRS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD976CRS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD976CRS?
AD976CRS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD976CRS 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 AD976CRS?
For technical support, including AD976CRS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD976CRS requirements.
6.How does Aetrix verify that AD976CRS is sourced from the original manufacturer or authorized distributors?
All AD976CRS 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 AD976CRS meets industry standards.
7.What is the process for return or replacement of AD976CRS?
All AD976CRS units undergo pre-shipment inspection (PSI). If there is an issue with AD976CRS, 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 AD976CRS part is unused and in its original packaging.
Return procedure for AD976CRS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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