AD977ACR - 16-Bit 200 kSPS SAR ADC | Analog Devices
MPN： AD977ACR ✓ 啟用中AD977ACR 概覽
An ADC is a mixed-signal integrated circuit that converts a continuously varying analog voltage into a numeric code for processing, measurement, or transmission. Within the semiconductor hierarchy, the AD977ACR is a data converter, specifically a SAR ADC and analog-to-digital converter. SAR converters compare the sampled input against an internal reference through a binary-search conversion process, making them well suited to instrumentation and control systems where power consumption and deterministic latency matter more than maximum sampling frequency.
The verified device information identifies the AD977 family as a high-speed, low-power 16-bit converter with single 5 V operation. The AD977A member provides a 200 kSPS throughput rate, while the related AD977 reaches 100 kSPS. Other verified characteristics include BiCMOS construction, an internal 2.5 V reference, switched-capacitor conversion, one analog input, and an industrial temperature grade for the AD977ACR ordering code.
The 20-lead gull-wing surface-mount package is identified as a rectangular SOP package by distributor listings. Its SAR architecture avoids the continuous internal sequencing demands of pipeline converters, helping limit power use while retaining 16-bit nominal resolution. Because the available web excerpts do not publish complete timing curves, input impedance, common-mode range, or full-scale accuracy tables, those parameters require confirmation in the Analog Devices AD977/AD977A technical documentation before a production design is released.
Typical uses include industrial process-control instrumentation, digital measurement systems, data-acquisition modules, sensor interface equipment, and embedded test systems. The single 5 V supply simplifies analog and digital power planning, while the internal 2.5 V reference can reduce the external component count when the application's accuracy and reference-current requirements allow it.
The principal design consideration is reference and layout discipline. Keep the analog input trace short, place decoupling capacitors close to the supply pins, and route high-current digital return currents away from the converter input. Confirm the source impedance, acquisition time, common-mode limits, and output-code behavior against the complete manufacturer datasheet rather than relying on marketplace summaries alone.
直接替換替代品，適用於 AD977ACR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
AD977AARZ
✅ 直接替換📋 參考替代品（不在目錄中）
AD977ACR 最大額定值與電氣特性
| 解析度 | 16 bit |
| Converter Type | Successive approximation (SAR) ADC |
| 取樣率 | 200 kSPS |
| Architecture | Switched-capacitor SAR |
| Process Technology | BiCMOS |
| 供應電壓 | 5 V single supply |
| Internal Reference Voltage | 2.5 V |
| Analog Input Count | 1 |
| Temperature Grade | Industrial |
| 封裝 | 20-pin SOIC |
| Terminal Count | 20 |
| 安裝方式 | Surface mount |
| Terminal Form | Gull wing |
| Package Shape | Rectangular |
| Package Code | SOP |
| Power Class | Low power |
AD977ACR sop 腳位配置指南
AD977ACR（sop 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： AD977ACR.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD977ACR 適用於 6 應用s: Industrial Process-Control Instrumentation, Precision Sensor Data-Acquisition, Embedded Data-Acquisition Modules, Test and Measurement Systems, Digital Voltmeter and Metering Designs, Audio and Communication Control Monitors.
Industrial Process-Control Instrumentation
The AD977ACR fits industrial process-control loops that require 16-bit measurement resolution at 200 kSPS from a single 5 V rail. Its internal 2.5 V reference can simplify analog conditioning when reference accuracy remains adequate, while the SAR architecture supports predictable, low-power conversion. Place it behind the protected sensor input and channel-selection network, and keep analog traces away from digital switching returns. The principal benefit is a compact mixed-signal subsystem with more throughput than the 100 kSPS AD977 version, although acquisition-time and input-impedance data must be checked in the complete datasheet before setting the sample rate.
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Precision Sensor Data-Acquisition
The AD977ACR is appropriate for sensor acquisition systems that must convert moderately varying analog inputs into 16-bit digital data at 200 kSPS. The single-input SAR converter supports deterministic acquisition, and the internal 2.5 V reference may reduce the external reference component count. For strain, temperature, or pressure channels, use a low-noise front end and place the converter close to the conditioned input node. Its advantage over the 100 kSPS AD977 is higher conversion throughput, but the source impedance and acquisition window must be verified before using it with slow-settling filters.
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Embedded Data-Acquisition Modules
The AD977ACR can serve as the analog acquisition stage in an embedded measurement module where the controller requires periodic numeric samples rather than continuous waveform streaming. Its 16-bit SAR format and 200 kSPS maximum throughput provide useful margin for multiplexed sensor channels. Use the internal 2.5 V reference only after verifying drift and noise against the measurement specification; otherwise, drive the reference pin with a suitable external source. Compared with a flash or pipeline converter, the SAR implementation emphasizes low power and integration simplicity, but the host processor must accommodate the converter's acquisition and conversion timing.
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Test and Measurement Systems
The AD977ACR is useful in bench and field test equipment that digitizes low-frequency or quasi-static analog signals with 16-bit resolution. The 200 kSPS throughput provides more conversion margin than the 100 kSPS AD977 while the low-power SAR architecture supports portable instruments. Buffer the input to present the source impedance expected by the switched-capacitor ADC, and place bypass capacitors close to the supply connections. Its internal 2.5 V reference can simplify portable analog sections, although a precision external reference may be preferable when absolute measurement accuracy, calibration stability, or traceable noise performance is required.
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Digital Voltmeter and Metering Designs
The AD977ACR is applicable to digital metering products that convert a conditioned analog voltage into a 16-bit measurement code. The 200 kSPS rate is ample for many panel meters while keeping power use modest, and the internal 2.5 V reference may reduce component count. The design must account for front-panel noise, protection, and reference error as system-level error sources rather than attributing all uncertainty to the converter. Compared with the 100 kSPS AD977, this part offers additional timing margin for averaging and filtering, but a low-bandwidth meter can still use the slower family member to reduce cost.
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Audio and Communication Control Monitors
The AD977ACR can monitor slow control levels in audio, communication, or industrial control systems when 16-bit resolution is useful and 200 kSPS is more than adequate. Its single 5 V analog supply and internal 2.5 V reference help reduce supply complexity compared with designs requiring multiple external precision references. Place the converter outside high-current switching loops and isolate the monitor input with appropriate filtering. The advantage versus the 100 kSPS AD977 is extra conversion margin, but for a purely slow level monitor this speed usually has little practical value, making cost and lifecycle requirements equally important selection criteria.
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推薦產品摘要
工程參考資料，適用於 AD977ACR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD977AARZ |
|---|---|---|
| Package | 20-pin SOIC | 20-pin SOIC |
| Brand | Analog Devices | Analog Devices |
| Resolution | 16 bit | 16 bit |
| Sampling Rate | 200 kSPS | 200 kSPS |
| Converter Architecture | Successive approximation, switched-capacitor | Successive approximation, switched-capacitor |
| Supply Voltage | 5 V single supply | 5 V single supply |
| Internal Reference | 2.5 V | 2.5 V |
| Analog Input Count | 1 | 1 |
主要差異化特點
- Higher family throughput with the same fundamental SAR conversion approach (對比AD977)
- Single-supply integration with an internal reference (對比AD977)
- Same-family replacement path in the established 20-lead SOIC format (對比AD977AARZ)
設計說明
Route the analog input directly to the converter and avoid sharing it with digital clocks or relay-control nets. Place the analog input network close to the ADC, keep the analog return path continuous beneath the device, and connect the analog and digital grounds at the power-entry strategy defined in the complete manufacturer layout guidance. The supplied excerpts do not include the reference layout, so component spacing and grounding details must be taken from the official AD977/AD977A documentation.
The AD977ACR uses a single 5 V supply, so confirm both analog and digital supply-pin connections and bypass requirements against the full pin configuration before layout release. Use the manufacturer's recommended bypass values and place each decoupling capacitor adjacent to its intended supply pin. Estimated note: the provided data does not include supply-current values, so no power-dissipation calculation can be verified here; use the datasheet current and dropout figures instead of assumptions.
Do not select between the 100 kSPS AD977 and 200 kSPS AD977A using only the 16-bit resolution label. Confirm acquisition time, sample-rate timing, source impedance, input range, and clock requirements in the complete datasheet. Also verify the temperature suffix when considering the AD977AARZ as a substitute: sharing the family, resolution, speed, and package does not by itself establish identical production-temperature coverage.
合規資訊
The supplied verified excerpts do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because no automotive qualification was identified for this industrial-grade ordering code.