AD678KD - 12-Bit 200 kSPS Sampling ADC | Analog Devices
部品番号: AD678KD ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $134.8715 | $134.87 |
| 10 | $134.8715 | $1,348.72 |
| 100 | $134.8715 | $13,487.15 |
| 500 | $134.8715 | $67,435.75 |
| 1,000 | $134.8715 | $134,871.50 |
AD678KD 概要
What is a complete sampling ADC? A sampling ADC captures an analog voltage with an internal sample-and-hold amplifier and converts that sample into a digital code. The AD678 belongs to the ADC hierarchy and integrates the sampling, conversion, reference, clock, and digital-interface functions needed for direct signal acquisition. This integration reduces the number of external components and makes the converter suitable for instrumentation, industrial control, communications, and measurement systems.
Key verified characteristics include 12-bit resolution, 200 kSPS operation, one analog input, flash architecture, parallel output, and a 28-pin CDIP/SBCDIP package. The AD678 is specified for dynamic parameters including signal-to-noise-plus-distortion ratio, total harmonic distortion, and intermodulation distortion. Those parameters are particularly relevant when the converter handles waveform acquisition or other signal-processing applications.
The device also includes a voltage reference and clock-generation circuitry, allowing it to operate as a more complete acquisition element than a bare flash-converter core. The Analog Devices product page states that the AD678 provides the same pinout as the 14-bit, 128 kSPS AD679 ADC, creating a documented upgrade path when a design requires related interface geometry and higher resolution at a lower sampling rate.
Typical uses include dynamic signal measurement, process monitoring, communications equipment, laboratory instrumentation, and industrial data-acquisition systems. The 200 kSPS rate is suitable for many high-speed measurement tasks, while the 12-bit code width establishes the digital resolution available to downstream processors.
A key design consideration is the distinction between a verified product-family relationship and a true drop-in replacement. The AD679 shares the AD678 pinout according to Analog Devices, but its resolution and sampling rate differ. Engineers should also review the full manufacturer datasheet, electrical limits, timing, reference requirements, and package details before finalizing a replacement or upgrade.
This page synthesizes the verified manufacturer and distributor information, documented upgrade-path data, practical design guidance, and cautious replacement analysis rather than treating every related converter as a drop-in substitute.
ドロップイン代替品: AD678KD — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
AD679
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD678
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AD678KD 最大定格＆電気的特性
| 分解能 | 12 bit |
| サンプリングレート | 200 kSPS |
| Input Count | 1 input |
| Architecture | Flash |
| Output Interface | Parallel |
| パッケージ | 28-pin CDIP/SBCDIP |
| 実装タイプ | Through Hole |
| Integrated Functions | Sample-and-hold amplifier, microprocessor-compatible bus interface, voltage reference, and clock-generation circuitry |
| Input Type | Single-ended |
| Voltage Reference | Internal voltage reference |
| Clock Generation | Internal clock-generation circuitry |
| MIL-STD-883 Version | Available in compliant versions |
AD678KD 28-pin cdip/sbcdip ピン配置ガイド
AD678KD (28-pin cdip/sbcdip パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: AD678KD.
詳細は データシート をご参照ください。
主な用途
AD678KD の用途: 6 件s: Dynamic Signal Acquisition, Industrial Process Monitoring, Communications Receiver Front End, Laboratory Measurement Equipment, Data-Acquisition Control Cards, Waveform Monitoring.
Dynamic Signal Acquisition
The AD678KD fits dynamic signal-acquisition systems that need a complete 12-bit converter rather than a bare ADC core. Its verified 200 kSPS sampling rate provides a defined conversion rate, while the integrated sample-and-hold amplifier, voltage reference, and clock-generation circuitry reduce external support requirements. The parallel output can feed a microprocessor, FPGA, or digital signal-processing system without a serial-interface conversion stage. Designers should confirm acquisition time, input bandwidth, and exact SNR+D, THD, and IMD limits in the manufacturer datasheet for the particular signal amplitude and sampling frequency.
おすすめ
Industrial Process Monitoring
AD678KD can be used in industrial process-monitoring equipment when sensor outputs must be digitized for supervisory control, logging, or alarm decisions. The single-input, 12-bit architecture is appropriate for many slow-to-moderate process signals, and the 200 kSPS capability provides margin for sampling multiple acquisition sequences around a measurement event. The integrated reference and clock circuitry can simplify the analog front end, but grounding, isolation, input protection, and calibration remain important. Use the exact manufacturer electrical limits to select input conditioning and ensure the selected controller can latch the parallel output reliably.
おすすめ
Communications Receiver Front End
AD678KD may suit communications or IF-signal measurement blocks where a parallel ADC output and integrated sampling functions simplify interface timing. Its 200 kSPS sampling rate makes it useful for selected envelope, waveform, or intermediate-frequency measurement paths, although it is not characterized here as a high-frequency RF converter. The design should verify input bandwidth, aliasing, dynamic range, and acquisition settling against the exact datasheet values. A sampling clock and digital processor must be synchronized carefully to avoid timing errors or repeated-conversion artifacts.
おすすめ
Laboratory Measurement Equipment
AD678KD is a practical candidate for laboratory instruments that acquire repeatable waveforms and perform digital filtering, statistics, or compensation in a downstream processor. Its 12-bit resolution gives a defined code width, while the integrated voltage reference and sample-and-hold amplifier help establish a consistent measurement chain. The 200 kSPS rate is suitable for many general-purpose measurement channels, but accuracy depends on input conditioning, reference behavior, source impedance, and PCB layout. Verify the package's through-hole pinout and thermal limits in the manufacturer datasheet before creating a new board.
おすすめ
Data-Acquisition Control Cards
AD678KD can be used in a data-acquisition card where a controller must receive sampled values over a parallel bus. The converter's single-input organization simplifies multiplexing when paired with an external analog switch, while its complete sampling architecture avoids the need for a separate sample-and-hold stage in a basic channel. Because AD678KD is a 28-pin through-hole device, designers should preserve the documented footprint and pin numbering in legacy control-card designs. Check acquisition timing, input settling, logic levels, and software scaling against the final system clock.
おすすめ
Waveform Monitoring
AD678KD is suitable for waveform-monitoring tasks that require moderate conversion speed and a parallel digital result, such as sampling a conditioned sensor waveform for peak, RMS, or spectral analysis. The 200 kSPS verified rate supports repeated samples at a known cadence, while 12-bit resolution provides 4096 digital code levels. The exact usable bandwidth is not established by the supplied snippets, so anti-alias filtering and front-end gain must be designed from the manufacturer specifications. The integrated reference and clock circuitry can simplify calibration, but system-level offset and gain error still require validation.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: AD678KD — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | AD679 | AD678 |
|---|---|---|---|
| Package | 28-pin CDIP/SBCDIP | 28-pin CDIP/SBCDIP; same documented pinout | 28-pin CDIP/SBCDIP; family/order-code verification required |
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bit | 14 bit | 12 bit |
| Sampling Rate | 200 kSPS | 128 kSPS | 200 kSPS |
主な差別化要因
- Documented same-pinout family upgrade path （vs AD679)
- Higher verified conversion rate than the AD679 comparison （vs AD679)
- Complete integrated conversion chain （vs AD679)
設計ノート
Begin with the manufacturer datasheet's supply-voltage and power-consumption limits; those values were not included in the supplied snippets. Because AD678KD integrates a voltage reference, sample-and-hold amplifier, and clock circuitry, the analog and digital supply rails must still be decoupled according to the datasheet layout guidance. Keep the reference and input paths away from high-current digital return paths, and verify that the controller's supply sequence does not violate the ADC's input limits.
Route the analog input, reference, and sample-and-hold-related connections away from the 12-bit parallel output bus. Keep the through-hole footprint and pin numbering consistent with the official AD678 datasheet; do not infer pin names from the AD679 relationship alone. Provide a clean return path beneath or around the converter, use short digital traces where practical, and place any external input protection or filtering close to the source while preserving the required acquisition bandwidth.
Do not treat the AD679 as an electrically identical replacement merely because Analog Devices states that the AD678 and AD679 have the same pinout. AD679 is documented as 14-bit and 128 kSPS, while AD678KD is 12-bit and 200 kSPS. Software code scaling, conversion timing, latency assumptions, and downstream filter behavior may change. Confirm the complete AD679 electrical specification and verify the exact PCB pinout before approving the substitution.
The parallel output bus creates a timing and grounding concern at the system level. Match the controller and ADC logic requirements, account for output timing and setup/hold margins, and avoid loading the outputs beyond the manufacturer's limits. If the acquisition clock is generated or distributed on the same board, separate clock routing from sensitive analog paths and evaluate crosstalk experimentally. Exact timing values are unavailable in the supplied data and must be taken from the manufacturer datasheet.
コンプライアンス情報
The supplied verified data states that AD678 versions are available compliant with MIL-STD-883, but it does not provide a definitive RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration for AD678KD. A comparison snippet lists RoHS as NN, but that field is not treated as an authoritative compliance statement.
