AD677AD - 16-Bit 100 kSPS Serial ADC | Analog Devices
MPN： AD677AD ⚠ 最後購買機會AD677AD 概覽
A sampling ADC is a mixed-signal semiconductor that samples an analog input and converts it into a corresponding digital value. Within the broader hierarchy of analog-to-digital converters, the AD677AD belongs to the successive-approximation-register, or SAR, ADC class. Unlike flash converters, a SAR ADC performs conversion through a sequence of comparisons. The AD677AD uses switched-capacitor charge redistribution as its conversion architecture and presents its converted data through a serial output.
The principal verified specifications are 16-bit resolution, one analog input, 100 kSPS sampling rate, and 10 microseconds total conversion time. On-chip autocalibration digitally corrects internal nonlinearities, improving converter performance without requiring an external calibration system. These characteristics make the AD677AD relevant to industrial instrumentation, process-control equipment, data-acquisition systems, and embedded measurement platforms that need deterministic, serial-output conversion.
The AD677 is a multipurpose converter rather than a dedicated automotive or audio device. Its serial interface can reduce the number of signal connections required on a circuit board compared with a parallel-output converter, although the exact interface timing, voltage ratings, reference requirements, and digital logic levels must be confirmed in the manufacturer datasheet before design release. System designers should also account for the acquisition cycle, reference accuracy, input bandwidth, input-range selection, and settling time surrounding each conversion.
Typical applications include process monitoring, environmental measurement, laboratory instrumentation, industrial transducers, and general-purpose data-acquisition systems. In each case, the AD677AD provides the core conversion function while the surrounding design must supply the analog input network, voltage reference, clocking, digital interface, and required decoupling. System-level accuracy depends on the complete signal chain rather than nominal converter resolution alone.
Because the AD677AD is marked LAST TIME BUY, engineers should confirm availability before starting new production designs. A component-level cross-reference search should be treated as an engineering starting point rather than proof of drop-in compatibility. Package construction, pinout, electrical limits, calibration behavior, interface timing, and lifecycle requirements must all be compared before any replacement is approved.
This page consolidates the verified manufacturer and distributor information for AD677AD, documents unsupported parameters explicitly, and separates confirmed product facts from engineering assumptions. It also provides application-focused design guidance, sourcing questions, and a strict comparison framework for engineers evaluating whether the legacy ceramic-DIP converter remains suitable for an existing or maintenance-focused design.
直接替換替代品，適用於 AD677AD — 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。
此系列的變體
與下列產品可直接替換的同系列型號： AD677AD （相同外形與佔位） — 差異在於 Package, Output Type, Total Conversion Time, Analog Supply, Architecture.
此產品無可直接替換的替代品。
申請替代品AD677AD 最大額定值與電氣特性
| 解析度 | 16 bit |
| 取樣率 | 100 kSPS |
| Total Conversion Time | 10 us |
| Input Count | 1 analog input |
| ADC Architecture | Successive-approximation-register (SAR) |
| Internal Architecture | Switched-capacitor charge redistribution |
| 輸出類型 | Serial |
| Calibration | On-chip autocalibration with digital nonlinearity correction |
| 封裝 | 16-lead ceramic DIP (CDIP) |
| 安裝類型 | Through-hole |
AD677AD 16-lead ceramic dip (cdip) 腳位配置指南
AD677AD（16-lead ceramic dip (cdip) 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： AD677AD.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD677AD 適用於 6 應用s: Industrial Process Measurement, Laboratory Data Acquisition, Environmental Monitoring, Precision Signal Conditioning, Legacy Test Equipment, Embedded Control and Monitoring.
Industrial Process Measurement
The AD677AD fits an industrial process-measurement channel that requires 16-bit conversion at up to 100 kSPS. Its 10-microsecond total conversion time permits relatively rapid acquisition, while the serial output limits the number of data connections between the converter and controller. On-chip autocalibration can reduce errors associated with internal nonlinearity. A practical implementation places the sensor signal behind suitable conditioning and protection, then uses a controlled reference and clock source. Because the verified data does not specify the input range, reference voltage, supply limits, or temperature rating, those details must be confirmed from the manufacturer datasheet before selecting the device for an industrial installation.
Laboratory Data Acquisition
The AD677AD is applicable to laboratory data-acquisition equipment that balances resolution, throughput, and interface simplicity. A 100 kSPS sampling rate and 16-bit resolution are suitable for many general-purpose measurement channels, while serial output can reduce board routing compared with a parallel converter. The complete instrument must still address analog settling, reference accuracy, input conditioning, and clock jitter. On-chip autocalibration corrects internal nonlinearity, but it does not eliminate errors introduced by the external front end. Because verified details such as ENOB, SNR, input impedance, and voltage-reference requirements are unavailable, engineers should treat the manufacturer datasheet as the controlling source before defining the measurement uncertainty.
Environmental Monitoring
The AD677AD can serve as the conversion element in an environmental monitoring system that repeatedly digitizes sensor outputs and transfers the results through a serial interface. Its 16-bit nominal resolution provides 65,536 digital codes, while the 100 kSPS rating offers enough throughput for many multi-channel monitoring arrangements when samples are multiplexed upstream. Serial output helps limit connector and PCB trace counts in compact monitoring equipment. System-level accuracy will depend on the sensor, analog filter, reference stability, and grounding. The verified data does not define the allowed input voltage or temperature range, so these parameters must be checked against the official datasheet before field deployment.
Precision Signal Conditioning
The AD677AD can be used at the end of a precision analog signal-conditioning chain when a 16-bit, 100 kSPS serial ADC is sufficient. Its switched-capacitor charge-redistribution architecture and 10-microsecond conversion time suit sampled measurement channels, while on-chip autocalibration addresses internal converter nonlinearity. The ADC should be preceded by circuitry that establishes the proper input range, bandwidth, and drive impedance, because converter specifications alone do not determine end-to-end accuracy. Layout must also separate sensitive analog routing from digital clock and serial-output paths. Exact acquisition time, settling requirements, reference characteristics, and recommended bypass components require consultation of the official manufacturer datasheet.
Legacy Test Equipment
The AD677AD is particularly relevant to maintenance of legacy test and measurement equipment that already uses a 16-lead ceramic DIP AD677 implementation. Preserving the existing converter can avoid an unnecessary board redesign when the replacement component must reproduce the original package, pinout, serial timing, and electrical behavior. The LAST TIME BUY designation means inventory planning and lifecycle confirmation are more important than in an active-production design. Engineers should compare any candidate against the original schematic, datasheet, calibration routine, and system timing rather than relying on an informal cross-reference. If the exact ceramic-DIP part cannot be secured, evaluate a redesign explicitly rather than assuming another AD677 package suffix is interchangeable.
Embedded Control and Monitoring
The AD677AD can support embedded analog monitoring in industrial and control systems where a controller must acquire a changing analog condition and consume the result over a serial interface. The 16-bit resolution provides a nominal 65,536-code digital scale, and the 100 kSPS conversion rate supports rapid sampling compared with many lower-rate general-purpose ADCs. The serial interface can reduce connection count, but the host processor must support its timing and data framing. Firmware should account for conversion latency, reference behavior, and any calibration requirements. Verified details for interface voltage, clock rate, supply voltage, and operating temperature are unavailable in the supplied excerpts and must be obtained from the Analog Devices datasheet before implementation.
工程參考資料，適用於 AD677AD — 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 |
|---|---|
| Brand | Analog Devices |
| Package | 16-lead ceramic DIP (CDIP) |
| Resolution | 16 bit |
| Sampling Rate | 100 kSPS |
| Total Conversion Time | 10 us |
| Input Count | 1 analog input |
| ADC Architecture | SAR switched-capacitor charge redistribution |
| Output Interface | Serial |
| Calibration | On-chip autocalibration with digital nonlinearity correction |
| Lifecycle Status | Last time buy |
主要差異化特點
- Verified legacy package identification (對比AD677BD)
- Confirmed conversion performance (對比AD677KNZ)
- Integrated digital correction (對比Unverified generic cross-reference candidates)
設計說明
Do not treat every AD677 orderable suffix as a drop-in alternative. The verified data identifies AD677AD as a 16-CDIP device, while the family also includes plastic DIP and SOIC options. Confirm the package outline, lead count, pin numbering, analog input connection, reference pins, supply pins, clock pins, and serial interface before substituting a part. A same-family comparison page is only a starting point and does not replace a manufacturer ordering-guide and datasheet review.
The verified excerpts do not provide AD677AD supply-voltage limits, quiescent current, or power dissipation. Before designing the power tree, consult the manufacturer datasheet for the permitted analog and digital supply ranges and determine whether separate rails or sequencing are required. Decoupling values must follow the datasheet and reference schematic rather than generic guidance. Because this is a last-time-buy legacy part, document the selected revision's electrical requirements carefully to support long-term maintenance and counterfeit-risk screening.
Separate the analog input and reference paths from the serial clock and digital output routing to reduce conversion-dependent error. Use a compact, grounded analog layout and place required bypass capacitors at the device pins according to the official application guidance. The verified data does not specify reference impedance, input capacitance, or clock frequency, so PCB placement and return-path decisions should be finalized only after those values are established from the AD677 datasheet.
Nominal 16-bit resolution does not guarantee 16-bit end-to-end accuracy. Measurement error can arise from the input amplifier, reference voltage, sensor source impedance, clock quality, noise, layout, and the system calibration method. Although the AD677 includes on-chip autocalibration for internal nonlinearity correction, verify when and how calibration must be performed. Use the manufacturer's stated accuracy and noise limits to define measurement uncertainty and avoid treating the number of digital codes as the available effective resolution.
合規資訊
The supplied verified web data does not contain explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements for AD677AD.
