AD678AD - 12-Bit 200 kSPS Flash ADC | Analog Devices
MPN: AD678AD ✓ AktifAD678AD Genel Bakış
A flash ADC is a high-speed analog-to-digital converter architecture that converts an analog input through parallel internal comparisons. The AD678 belongs to the ADC, data-converter IC, and analog-signal-processing semiconductor hierarchies. It is intended for acquisition and signal-processing systems requiring 12-bit digital data at a rate up to 200 kSPS rather than the throughput of modern multi-gigahertz serial converters.
The AD678AD's principal features include 12-bit resolution, one analog input, flash conversion, parallel data output, and a 200 kSPS sampling rate. Integration reduces the number of external components required for a complete conversion channel by combining the sample-and-hold amplifier, reference, clock generation, and processor interface in one package. The manufacturer also identifies the AD679 14-bit, 128 kSPS ADC as having the same pinout as the AD678, enabling a potential migration path when greater resolution or lower throughput is appropriate.
The AD678 is specified for both dynamic and static behavior, including signal-to-noise plus distortion ratio, total harmonic distortion, and intermodulation distortion. These characteristics make converter performance relevant to signal processing rather than only to basic digital measurement. The parallel bus is suited to microprocessor systems that can capture the converter output directly, while the internal reference and clock circuitry provide a self-contained acquisition front end.
Typical uses include industrial data acquisition, instrumentation, waveform measurement, communications signal processing, and laboratory or control systems. In a complete acquisition channel, the analog input enters the sample-and-hold amplifier, the flash conversion stage produces a 12-bit result, and the parallel interface transfers that result to a processor or programmable logic device. A design must still account for input bandwidth, source impedance, reference requirements, acquisition timing, and output bus timing.
The primary design consideration is ensuring that the selected package variant, temperature grade, and qualification level satisfy the end application. AD678 versions are available in commercial and military-oriented configurations, but the supplied data does not establish the exact operating-temperature range for AD678AD. Engineers should therefore verify the ordering code, full electrical limits, and pin arrangement against the current Analog Devices data sheet before release to production.
This product record consolidates the verified manufacturer and distributor information, package details, sourcing references, and same-family upgrade information for AD678AD. It also distinguishes documented characteristics from unverified fields and provides a practical framework for comparing the AD678 family when designing a 12-bit parallel sampling system.
Drop-in alternatifler için AD678AD — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller AD678AD (aynı form faktörü ve ayağa oturma) — farklı olan Package, Architecture, Clock Generation, Input Type, Mounting Type.
AD678BD
✅ Yerleştirme ⚠️ Onaylanmamış ÖzelliklerFiyat için iletişime geçin
Veri Şablonunu Görüntüle →AD678JD
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
AD678KD
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →AD678KN
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
AD678SD
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
AD678AD Maksimum Değerlendirmeler & Elektriksel Özellikler
| Çözünürlük | 12 bit |
| Maximum Sampling Rate | 200 kSPS |
| Analog Input Count | 1 channel |
| Input Type | 1 single-ended input |
| Architecture | 1 flash-conversion architecture |
| Data Output Interface | 1 parallel microprocessor-compatible interface |
| Paket | 28-pin SBCDIP |
| Package Body Width | 0.600 inch (15.24 mm) |
| Sample-and-Hold Amplifier | 1 integrated SHA |
| Voltage Reference | 1 internal voltage reference |
| Clock Generation | 1 integrated clock-generation circuit |
| Signal Processing Metrics | 1 S/N+D, THD, and IMD characterization set |
| Pin Compatibility | Same pinout as the AD679 14-bit, 128 kSPS ADC |
| Military Configuration Availability | 1 AD678 version compliant with MIL-STD-883 |
AD678AD 0.600 inch (15.24 mm) Pin Yapısı Kılavuzu
AD678AD (0.600 inch (15.24 mm) paket) için pin yapısı. Bu analog bileşen, giriş, çıkış ve güç besleme pinleri içerir. Ofset null, telafi ve etkinleştirme pin yapılandırmaları için üretici veri kitapçığını referans alın. Sinyal işleme ve güç amplifikasyon devreleri için mükemmel bir bileşendir.
Ayrıntılı pin çıkış verisi mevcut değil: AD678AD.
Aşağıdaki veri sayfası tam pin konfigürasyonu için.
Tipik Uygulamalar
AD678AD için uygundur 6 uygulamas: Industrial Process Data Acquisition, Instrumentation and Waveform Measurement, Communications Signal Processing, Industrial Control Feedback Loops, Legacy Data-Acquisition Backplane, Precision Signal Monitoring.
Industrial Process Data Acquisition
The AD678AD fits industrial process-measurement systems that require reliable conversion of single-ended sensor signals at up to 200 kSPS. Its 12-bit flash architecture samples the input through an integrated sample-and-hold amplifier and transfers each result through a microprocessor-compatible parallel interface. This arrangement is appropriate for controller or data-logger designs that need frequent numerical updates rather than very high-rate waveform capture. A practical implementation should place input conditioning close to the converter, control acquisition timing, and account for the full 28-pin SBCDIP footprint. Because the supplied data does not specify the AD678AD input range, supply limits, or acquisition time, those values must be confirmed from the current Analog Devices data sheet before sensor scaling and front-end design are finalized.
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Instrumentation and Waveform Measurement
The AD678AD is suitable for laboratory and industrial instrumentation that digitizes repetitive or slowly changing waveforms at a rate as high as 200 kSPS. A 12-bit code provides 4,096 discrete amplitude levels for a single-ended input, while the flash architecture and parallel bus simplify deterministic data capture by a processor or programmable logic device. The integrated sample-and-hold amplifier, voltage-reference circuitry, and clock-generation circuitry reduce the component count of the conversion channel. Designers should still verify input bandwidth, acquisition settling, source impedance, clock jitter sensitivity, and output timing because those detailed limits were not included in the supplied source material. The result is a consolidated converter subsystem for bench instruments, panel meters, and specialized measurement equipment.
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Communications Signal Processing
The AD678AD can serve as the sampling element in communications and signal-processing equipment operating below its 200 kSPS conversion limit. Its 12-bit flash resolution and characterized dynamic metrics—including signal-to-noise plus distortion, total harmonic distortion, and intermodulation distortion—make it relevant to waveform analysis, modulation research, and baseband measurement systems. The parallel interface permits direct transfer of each conversion result into digital processing logic, while the integrated sample-and-hold stage provides a defined input-sampling function. The supplied evidence does not provide noise figures, full-scale input range, or clock-jitter limits, so these parameters must be taken directly from the manufacturer data sheet. Engineers should evaluate them against the signal bandwidth and required adjacent-channel rejection before selecting the converter.
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Industrial Control Feedback Loops
AD678AD can support industrial control and monitoring loops that require a numeric representation of a single-ended analog variable at up to 200 kSPS. The flash ADC produces 12-bit conversion results, and the parallel microprocessor-compatible interface allows a controller to sample the value without adding a separate serial protocol converter. The integrated sample-and-hold amplifier and clock-generation circuitry help simplify the acquisition channel, while the monolithic implementation reduces board area compared with several discrete function blocks. For a feedback application, the useful design criterion is the complete loop delay from sampling to digital output, not merely the headline 200 kSPS rate. The exact acquisition time, logic levels, settling behavior, and operating limits must be verified from the current data sheet before control-loop timing is assigned.
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Legacy Data-Acquisition Backplane
The AD678AD is a practical option for maintaining or expanding legacy data-acquisition systems designed around a 28-pin parallel ADC footprint. Its 200 kSPS, 12-bit flash conversion capability and integrated sample-and-hold amplifier provide a complete basic acquisition path, while the AD679's documented shared pinout offers a possible migration to 14-bit resolution at a reduced 128 kSPS rate. Such reuse can preserve processor interfaces and board mechanics, but it requires careful validation of timing, reference behavior, and output coding. The ceramic SBCDIP package is mechanically suited to through-hole legacy systems but occupies considerably more board area than a modern surface-mount ADC. A drop-in decision should therefore include component availability and the manufacturer's current long-term-supply status, not only pin and headline performance.
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Precision Signal Monitoring
The AD678AD can be used in precision monitoring equipment where a 12-bit, single-ended conversion result is required at moderate sampling rates. Its dynamic specifications allow designers to evaluate signal-to-noise plus distortion, total harmonic distortion, and intermodulation distortion rather than relying on resolution alone. The parallel output can feed counters, DSP logic, or a microprocessor for filtering, peak detection, and event logging. For low-level sensor signals, the front-end amplifier must still provide adequate noise performance and drive the converter's input network correctly. Since the verified data does not state the input voltage range, common-mode range, input impedance, or reference accuracy, the signal-conditioning design must wait for those parameters. The AD678AD is best considered where legacy package compatibility or deterministic parallel acquisition is more valuable than the footprint and interface efficiency of newer converters.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: AD678AD — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | AD678BD | AD678JD | AD678KD | AD678KN | AD678SD |
|---|---|---|---|---|---|---|
| Package | 28-Pin SBCDIP | 28-Pin SBCDIP | 28-Pin SBCDIP | 28-Pin SBCDIP | 28-Pin SBCDIP | 28-Pin SBCDIP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Maximum Sampling Rate | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS |
| Architecture | Flash ADC | Flash ADC | Flash ADC | Flash ADC | Flash ADC | Flash ADC |
| Analog Input Count | 1 input | 1 input | 1 input | 1 input | 1 input | 1 input |
| Output Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
| Integrated Sample-and-Hold Amplifier | Yes | Yes | Yes | Yes | Yes | Yes |
Ana Farklılayıcılar
- Complete integrated acquisition channel (karşılaştırma:AD679)
- Higher sampling rate than the shared-pinout upgrade path (karşılaştırma:AD679)
- Higher native resolution for the same-pinout alternative (karşılaştırma:AD679)
- Direct compatibility with the AD678 28-pin footprint (karşılaştırma:AD678JD)
Tasarım Notları
Treat the AD678AD input network as a timing-sensitive analog interface even though the converter uses a parallel digital output. The verified data confirms a 200 kSPS maximum rate but does not provide acquisition time, input impedance, or input bandwidth. Before selecting the source impedance and capacitor values, obtain those limits from the current data sheet and preserve the specified settling margin. Keep the analog trace short, place input bypass components close to the relevant pins, and separate the input path from switching nodes to avoid contaminating the 12-bit conversion result.
Route the 12-bit parallel output as a short, controlled-length bus to the capturing processor or logic device. Although the AD678AD is available in a through-hole 28-pin SBCDIP package, the digital output still needs a low-noise return path and sensible separation from analog input and clock lines. Place any decoupling capacitors near the supply pins according to the manufacturer layout guidance, provide an uninterrupted ground reference, and avoid routing the parallel bus adjacent to high-current switching paths. These precautions matter because parallel timing errors or return-current coupling can compromise conversion results even when the converter itself is operating correctly.
Do not treat every AD678 suffix as an unconditional substitute for AD678AD. The supplied evidence supports the shared 12-bit, 200 kSPS flash-converter configuration and 28-pin package, but reference selection, temperature grade, qualification, and screening can differ by ordering code. The comparison data specifically identifies internal-versus-external reference differences among some family members. Download the current data sheet for the exact suffix, compare every ordering-table parameter, and verify the pinout and acquisition timing before approving a drop-in replacement.
Supply decoupling and power-distribution design must be based on the exact AD678AD electrical limits, which are not included in the supplied source data. The manufacturer data sheet should be used to determine supply voltage, current consumption, sequencing, and permitted operating conditions. Use short supply connections, place bulk and high-frequency decoupling according to the reference layout, and avoid sharing narrow return paths with switching converters or relays. After the final supply network is selected, verify regulator headroom and the converter's power dissipation under the intended input range and sampling pattern.
Uyumluluk Bilgisi
The supplied sources state that versions of the AD678 family are available compliant with MIL-STD-883, but they do not explicitly provide AD678AD-specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is marked not_applicable because this ADC is not presented as an automotive-qualified device.
