AD976ACR - 16-Bit 200 kSPS SAR ADC | Analog Devices
MPN: AD976ACR ✓ ActiveAD976ACR Overview
A successive-approximation ADC, or SAR ADC, is a type of data-converter IC that determines each digital output code through a sequence of internal comparisons. The AD976ACR belongs to the SAR ADC hierarchy, which sits within analog-to-digital converters and broader data-conversion and semiconductor categories. Its parallel output architecture reduces the external multiplexing burden commonly associated with serial-interface converters, making it suitable for systems that sample waveforms or process digitized measurements at high sample rates.
The principal features include 16-bit resolution, a 200 kSPS conversion throughput, single 5 V operation, low power dissipation, and a high-speed parallel interface. The switched-capacitor internal architecture supports the conversion speed specified for the AD976A family. Designers can select an external precision reference or use the internal 2.5 V reference, depending on calibration, drift, and accuracy requirements. An on-chip clock reduces the need for an external timing component when the converter's internal clock is suitable for the application.
The AD976 and AD976A family combines a 16-bit switched-capacitor SAR ADC with parallel data outputs in 28-lead DIP, SSOP, and SOIC packages. The AD976A reaches 200 kSPS, while the original AD976 is specified at 100 kSPS. This distinction is important when comparing exact orderable MPNs because a package match alone does not guarantee identical throughput, temperature grade, or lead-finish characteristics. The AD976ACR ordering code specifically denotes the Analog Devices AD976A configuration in a 28-lead SOIC package.
Typical applications include industrial instrumentation, communications equipment, data-acquisition systems, medical or laboratory measurement equipment, and embedded DSP signal processing. The 200 kSPS rate is suitable for sampling control and sensor signals when the system requires higher throughput than the 100 kSPS AD976 configuration. The parallel interface can connect directly to suitable digital buses or input stages, although signal conditioning, reference design, and acquisition timing still require careful validation.
The main design consideration is preserving the accuracy of a 16-bit conversion while controlling noise, reference stability, and digital-interface timing. Designers should account for the specified 100 mW maximum power dissipation when designing the 5 V supply and board layout. Input and reference routing should minimize noise coupling, while clock and data timing must meet the requirements of the selected parallel interface. The manufacturer datasheet remains the authoritative source for pinout, timing, electrical limits, and application details.
This page consolidates the verified manufacturer and distributor information for AD976ACR, distinguishes the 200 kSPS AD976A from the 100 kSPS AD976, records verified sourcing links, and identifies the limited availability of true pin-compatible alternatives. It also provides practical application guidance and transparent data gaps rather than presenting unverified specifications or packaging variants as drop-in replacements.
Drop-in alternatives for AD976ACR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesAD976ACR Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Conversion Throughput | 200 kSPS |
| Input Channel Count | 1 channel |
| Architecture | Successive-approximation switched-capacitor ADC |
| Supply Voltage | 5 V |
| Internal Reference Voltage | 2.5 V |
| Reference Selection | External or internal 2.5 V reference |
| Data Interface | High-speed parallel |
| Clock | On-chip clock |
| Process Technology | BiCMOS |
| Maximum Power Dissipation | 100 mW |
| Package | 28-lead SOIC |
AD976ACR 28-lead soic Pin Configuration Guide
Pin configuration for AD976ACR (28-lead soic package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for AD976ACR.
Refer to the datasheet for full pin configuration.
Typical Applications
AD976ACR is suitable for 6 applications: Industrial Data-Acquisition Systems, Communications Signal Conditioning, Precision Instrumentation, Medical and Laboratory Measurement, Embedded DSP Waveform Processing, Test and Measurement Equipment.
Industrial Data-Acquisition Systems
The AD976ACR fits industrial data-acquisition systems that need 16-bit measurements at up to 200 kSPS while operating from a single 5 V supply. Its switched-capacitor SAR architecture samples the selected input and exposes the conversion result through a high-speed parallel interface, allowing the output to be captured by an FPGA, DSP, or embedded controller. The 100 mW maximum power dissipation helps limit thermal loading, although the input driver and reference must still preserve the converter’s effective accuracy. In a practical design, the analog input should be buffered, filtered for alias rejection, and referenced to a stable source; external versus internal 2.5 V reference selection depends on calibration and drift requirements.
Recommended
Communications Signal Conditioning
The AD976ACR is appropriate for communications subsystems requiring 16-bit, 200 kSPS conversion and a parallel digital interface. The 5 V supply and selectable 2.5 V internal or external reference allow the converter to sit after an analog front end and before a communications DSP or FPGA. Its parallel output reduces serial-interface overhead while preserving a high sampling rate. For this application, clock jitter, common-mode rejection, and anti-alias filtering are critical because converter quantization alone does not determine received-data quality. The board should provide short, matched digital routes, a quiet analog return path, and stable reference bypassing validated against the manufacturer’s recommended layout.
Recommended
Precision Instrumentation
The AD976ACR can support precision instrumentation that samples transducers, laboratory inputs, or control-loop signals at up to 200 kSPS with 16-bit digital resolution. The single 5 V architecture simplifies supply planning, while the choice between an external reference and the internal 2.5 V reference allows designers to trade board simplicity against calibration and drift performance. A high-quality input buffer should drive the analog input, and filtering should be selected according to the required bandwidth rather than merely the converter’s sample rate. The 100 mW maximum dissipation should be included in the thermal budget, while parallel output timing must be verified against the selected controller acquisition window.
Recommended
Medical and Laboratory Measurement
The AD976ACR is suitable for laboratory and selected medical-measurement front ends that need faster conversion than a 100 kSPS AD976-class device while retaining a 16-bit parallel-output architecture. Its single 5 V operation simplifies low-voltage acquisition boards, and the internal 2.5 V reference can shorten initial bring-up when system-level accuracy permits. In a measurement path, the analog front end must provide safe gain, sufficient input bandwidth, and low noise; the ADC does not compensate for sensor excitation errors or poor grounding. Reference stability, calibration strategy, patient-protection requirements, and applicable medical product standards must be addressed separately at the complete-system level.
Recommended
Embedded DSP Waveform Processing
The AD976ACR supports embedded DSP waveform-processing designs requiring 16-bit samples at up to 200 kSPS. Its parallel interface can transfer complete conversion words into a DSP or FPGA acquisition path, which is useful when software filtering, modulation, demodulation, or control algorithms must run after digitization. The device’s on-chip clock provides a simplified timing option, but engineers should verify whether the internal clock meets the jitter and frequency requirements of the system. Analog conditioning must settle before each sample is captured, and the digital side must be synchronized to the converter’s conversion and output timing rather than assuming continuous asynchronous sampling.
Recommended
Test and Measurement Equipment
The AD976ACR can be used in test and measurement equipment that records or analyzes analog waveforms requiring 16-bit resolution and a 200 kSPS acquisition rate. The single 5 V operation and parallel output suit compact instrument architectures, while external-reference support permits tighter control of gain accuracy and calibration. A practical instrument implementation should include an input protection strategy, an anti-alias or reconstruction-oriented filter appropriate to the signal bandwidth, and a digital acquisition controller capable of accepting parallel data. Designers should use the manufacturer timing and electrical characteristics to establish acquisition-window margin and should not infer noise performance from the nominal 16-bit resolution alone.
Recommended
Engineering reference data for AD976ACR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 28-lead SOIC |
| Brand | Analog Devices |
| Resolution | 16 bit |
| Conversion Throughput | 200 kSPS |
| Input Channel Count | 1 channel |
| Architecture | Successive-approximation switched-capacitor ADC |
| Supply Voltage | 5 V |
| Reference Options | External or internal 2.5 V reference |
| Data Interface | High-speed parallel |
| Maximum Power Dissipation | 100 mW |
Key Differentiators
- Higher conversion throughput than the original AD976 (vs AD976AR)
- Configurable voltage reference (vs AD976CRSZ)
- Integrated high-speed parallel data interface (vs AD976AR)
Design Notes
Budget the AD976ACR supply around its single 5 V operating requirement and the verified 100 mW maximum power dissipation. Place the supply bypass capacitors close to the device's power and ground pins, provide a low-impedance analog return path, and avoid sharing noisy return current with the input conditioning stage. Because the retrieved data did not include detailed AC supply-current limits or recommended capacitor values, use the manufacturer's electrical-characteristics and layout guidance before finalizing the power network.
Keep the analog input, reference, and ground paths short and physically separated from the 16-bit parallel output routes. Route clock and data timing consistently, with attention to trace length, return continuity, and crosstalk. The verified results confirm a high-speed parallel interface but do not provide complete timing or layout values. Cross-check the exact AD976ACR pin assignments and acquisition timing in the manufacturer datasheet before fixing the fan-out and connector arrangement.
Preserve conversion accuracy by ensuring the input driver settles before the sampling instant and by filtering energy outside the intended measurement bandwidth. Reference noise directly affects excitation and conversion accuracy, so bypass the selected external reference or internal-reference output according to the manufacturer guidance. Do not infer accuracy from the 16-bit resolution alone; verified SNR, INL, DNL, offset, and gain-error limits were not included in the supplied data.
Do not substitute the 100 kSPS AD976 for the 200 kSPS AD976A configuration, even if both use a 28-lead package. AD976ACRZ and AD976CRSZ appeared in search results, but the supplied information did not establish that either is a complete pin-compatible replacement for every electrical, temperature-grade, and ordering condition. Verify the complete ordering table, pinout, throughput, reference configuration, and lifecycle status before substituting any related MPN.
Compliance Information
The supplied product and distributor results did not contain explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals statements. AEC-Q100 is not applicable because the AD976ACR is not identified as an automotive-qualified device in the provided data.