AD679KD - 14-Bit 128 kSPS Sampling ADC | Analog Devices
料号： AD679KD ✓ 量产中AD679KD 概述
An ADC is a mixed-signal semiconductor that converts an analog voltage into a digital code. A sampling ADC adds a sample-and-hold function so the input voltage is captured for conversion rather than changing continuously during the measurement. The AD679 belongs to the ADC and DAC > ADC/DAC category within the broader mixed-signal semiconductor and data-converter hierarchy.
The AD679KD's principal verified characteristics are 14-bit resolution, a 128 kSPS conversion rate, one analog input, and a 28-pin CDIP package. Its integrated sample-and-hold amplifier, reference, clock circuitry, and digital interface make it a complete converter rather than a bare sampling core. These characteristics suit deterministic acquisition systems where a compact, multichip-equivalent signal chain and direct digital data access are valuable.
The manufacturer describes the AD679 with dynamic parameters including signal-to-noise-plus-distortion ratio, total harmonic distortion, and intermodulation distortion. These metrics are particularly relevant to audio and general signal-processing applications because they characterize conversion performance for AC signals rather than only the static resolution stated as 14 bits. The AD679 is also documented as sharing its pinout with the 12-bit, 200 kSPS AD678 ADC.
Typical uses include industrial instrumentation, audio signal capture, communications equipment, data-acquisition systems, and embedded measurement platforms. The single-input architecture favors systems that need one high-rate conversion channel and can manage multiplexing externally. Its processor-compatible interface supports integration with digital controllers, while the integrated reference and clock circuitry reduce the number of external analog-support components.
A key design consideration is that the AD679KD is a ceramic DIP package rather than a compact surface-mount option. Designers should preserve adequate board spacing, socket clearance, and mechanical support while confirming that the selected package variant satisfies temperature, vibration, and environmental requirements. Because the supplied data does not include operating-temperature limits, reference accuracy, input range, or power-supply specifications, those values must be confirmed in the Analog Devices AD679 datasheet before design release.
This page combines the verified manufacturer and distributor data for the AD679KD with package guidance, application analysis, and an explicit separation between documented facts and parameters that still require datasheet confirmation. It also distinguishes a true same-package drop-in replacement from functional or pin-compatible alternatives that would require additional qualification.
直接替换替代料： AD679KD ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料AD679KD 最大额定值与电气特性
| 分辨率 | 14 bit |
| 采样率 | 128 kSPS |
| Analog Input Count | 1 input |
| Architecture | Monolithic complete sampling ADC |
| Sample-and-Hold Amplifier | Integrated |
| Voltage Reference | Integrated |
| Clock Generation Circuitry | Integrated |
| Digital Interface | Microprocessor-compatible bus interface |
| Dynamic Performance Metrics | S/N+D ratio, THD, and IMD |
| 封装 | 28-pin CDIP |
| 引脚数量 | 28 pins |
| 安装类型 | Through-hole |
| Upgrade Path | Same pinout as the 12-bit, 200 kSPS AD678 ADC |
| Military Availability | Versions compliant with MIL-STD-883 available |
AD679KD 28-pin cdip 引脚配置指南
AD679KD（28-pin cdip 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： AD679KD.
请参阅 数据手册 以查看完整引脚配置。
典型应用
AD679KD 适用于 6 应用s: Industrial Process Instrumentation, Audio Signal Acquisition, Communications Measurement, Data Acquisition and Control, Laboratory Signal Conditioning, Environmental and Reliability Monitoring.
Industrial Process Instrumentation
The AD679KD suits single-channel industrial process measurement where 14-bit resolution and a 128 kSPS conversion rate provide useful signal detail. Its integrated sample-and-hold amplifier, voltage reference, clock generation, and processor-compatible interface reduce the number of support blocks required around the converter. A sensor signal can be conditioned, sampled, and converted directly for a controller or data-acquisition module. Because only one analog input is listed, a multiplexer may be needed when several sensors must be measured sequentially. Before deployment, engineers should verify input range, supply voltage, reference accuracy, and operating-temperature limits in the AD679 datasheet.
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Audio Signal Acquisition
The AD679KD can support audio and general AC-signal acquisition where dynamic performance is more important than maximum conversion speed. Its 14-bit resolution and specified 128 kSPS sampling rate are paired with manufacturer-defined S/N+D ratio, THD, and IMD metrics, allowing a design to assess distortion as well as nominal resolution. The integrated sample-and-hold stage supports periodic acquisition, while the digital bus transfers conversion results to signal-processing hardware. Designers should derive the required anti-alias filter from the actual signal bandwidth and confirm the converter's input range, dynamic performance limits, and clock requirements from the manufacturer datasheet.
推荐
Communications Measurement
The AD679KD is applicable to communications test and measurement systems that acquire one analog channel at up to 128 kSPS with 14-bit representation. Its microprocessor-compatible bus interface enables captured codes to be transferred into digital processing or storage hardware, while the integrated reference and clock circuitry support a more self-contained converter arrangement. The fixed 128 kSPS rate should be compared with the modulation or measurement bandwidth before front-end filtering is finalized. In deployed communications equipment, designers must also verify clock jitter tolerance, input impedance, output coding, and timing margins because those detailed values are not included in the supplied verified excerpts.
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Data Acquisition and Control
The AD679KD fits embedded data-acquisition and control loops requiring a precise 14-bit conversion result and a processor-friendly digital interface. At 128 kSPS, it can sample one analog waveform repeatedly and deliver each conversion to a digital controller or storage engine. Integration of the sample-and-hold amplifier, voltage reference, and clock-generation circuitry can simplify board partitioning compared with a modular converter approach. Because the AD679KD has one analog input, external switching may be necessary for multichannel systems. The through-hole 28-pin CDIP package also needs sufficient board area and connector clearance in space-constrained equipment.
推荐
Laboratory Signal Conditioning
The AD679KD is appropriate for laboratory instruments that acquire one conditioned analog channel and require 14-bit resolution without an external sample-and-hold assembly. Its stated 128 kSPS rate is useful for many sensor, waveform, and control measurements that do not require the AD678's 200 kSPS rate. The integrated reference and clock-generation blocks support a defined converter implementation, while the microprocessor-compatible bus simplifies connection to test-control logic. Instrument designers should still account for analog input conditioning, grounding, reference-noise coupling, and timing layout. Those implementation parameters must be taken from the complete manufacturer datasheet rather than inferred from distributor summaries.
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Environmental and Reliability Monitoring
The AD679KD can be evaluated for environmental-monitoring equipment that records a single transducer or conditioned system channel. Its 14-bit resolution preserves fine signal detail, while the complete sampling architecture consolidates the acquisition front end into one converter package. Analog Devices states that versions of the AD679 are available compliant with MIL-STD-883, which is relevant when a project requires a specifically qualified military variant rather than the catalog AD679KD. The commercial AD679KD and the separately qualified 883 version should not be assumed interchangeable without reviewing ordering information. Environmental screening, temperature limits, and MIL-STD-883 processing requirements must therefore be confirmed before procurement.
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推荐产品汇总
工程参考数据： AD679KD ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 |
|---|---|
| Package | 28-pin CDIP |
| Brand | Analog Devices |
| Resolution | 14 bit |
| Sampling Rate | 128 kSPS |
| Analog Input Count | 1 input |
| Converter Architecture | Complete monolithic sampling ADC |
| Integrated Functions | Sample-and-hold amplifier, voltage reference, clock generation, and microprocessor-compatible bus |
| Mounting Type | Through-hole |
| Documented Pin Compatibility | Same pinout as the 12-bit, 200 kSPS AD678 ADC |
关键差异点
- Higher conversion resolution than the documented AD678 upgrade path （对比 AD678)
- Lower stated sampling rate than the AD678 （对比 AD678)
- Complete converter integration （对比 AD679JNZ)
设计说明
Reserve the footprint and mechanical clearance for a 28-pin through-hole CDIP rather than a surface-mount ADC. Follow the Analog Devices package drawing for row spacing and keep copper, signal traces, and nearby heat sources away from exposed leads where practical. A socket may simplify replacement, but its pin geometry and temperature rating must be checked against the ceramic package. Digital return paths from the processor interface should be routed away from the analog input to reduce converter coupling.
Treat the analog input as a high-impedance acquisition node. Keep the input path short, use a stable reference plane, and place any required input filtering close to the AD679KD. The verified data confirms an integrated sample-and-hold amplifier but does not specify acquisition time, input impedance, or allowable source impedance. Those values must be obtained from the datasheet before selecting an op-amp or sensor drive network; otherwise the 128 kSPS conversion rate may not be achievable in the completed circuit.
Do not treat the 14-bit nominal resolution as a guarantee of 14-bit absolute accuracy in every design. Analog input range, reference error, offset, gain error, missing-code behavior, and noise all affect usable precision. The supplied excerpts identify S/N+D, THD, and IMD as relevant dynamic metrics but do not provide their numerical limits. Use the official AD679 datasheet to establish AC and DC accuracy requirements, then reserve PCB space for input conditioning and decoupling prescribed by the manufacturer.
Confirm the required supply rails, sequencing, and decoupling from the AD679 datasheet before finalizing the power architecture. Because the device integrates a voltage reference and clock-generation circuitry, bypassing requirements may differ from those of a bare ADC, and no supply-current figures are present in the verified excerpts. Place the manufacturer-specified bypass capacitors at the associated supply pins, preserve a low-impedance return path, and avoid routing switching-regulator nodes beneath the analog input or reference area.
合规信息
Analog Devices states that versions of the AD679 are available compliant with MIL-STD-883. The supplied excerpts do not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations for AD679KD. AEC-Q100 is not applicable because this is not an automotive-qualified device under the supplied evidence.
