AD779JN - 14-Bit 128 kSPS ADC | Analog Devices | Signal Processing
MPN： AD779JN ✓ 啟用中AD779JN 概覽
An ADC is an analog-to-digital converter, a semiconductor that samples a continuous analog voltage and converts it into a numeric value for processing, measurement, or control. In the product hierarchy, the AD779JN is a data-conversion IC and specifically a monolithic, successive-approximation-style sampling ADC. Its 14-bit conversion resolution provides 16,384 digital codes, making it suitable for instrumentation, industrial measurement, and signal-acquisition systems.
The verified key specifications are 14-bit resolution, a maximum sampling rate of 128 kSPS, one input channel, and a 28-pin PDIP package. The integrated sample-and-hold amplifier supports acquisition of analog signals without requiring a separate external sample-and-hold stage. The microprocessor-compatible interface enables a host processor or controller to retrieve each conversion result. An internal voltage reference and clock-generation block also reduce the number of external supporting components required in a measurement circuit.
The AD779 family is characterized for both dynamic and static signal-conversion performance. Dynamic specifications include signal-to-noise-plus-distortion ratio, total harmonic distortion, and intermodulation distortion, while static specifications address conversion accuracy and other DC behavior. According to the Analog Devices product information, the converter uses Analog Devices BiMOS monolithic technology, intended to provide the reliability advantage of a monolithic implementation over multichip or hybrid designs.
Typical uses include industrial process monitoring, sensor-signal conditioning, laboratory data acquisition, audio and general signal processing, and microprocessor-controlled measurement systems. The 128 kSPS conversion rate is suitable for sampling bandwidths well below 64 kHz under ideal Nyquist conditions. Practical system bandwidth must also account for the input network, reference accuracy, digital-interface timing, and the acquisition characteristics specified in the manufacturer datasheet.
Designers should follow the manufacturer’s recommended input, reference, decoupling, and digital-interface circuits rather than treating the ADC as an isolated block. Grounding, return-current control, and keeping analog and digital signal paths physically separated are important for preserving achievable conversion performance. The complete pinout, supply limits, input ranges, reference characteristics, and timing values should be confirmed in the Analog Devices datasheet before layout release.
This page consolidates the verified AD779JN device identity, package, resolution, throughput, official documentation, distributor listings, family-grade alternatives, and practical engineering guidance. It also separates verified facts from parameters that still require datasheet confirmation, making it easier to compare the AD779JN without relying on incomplete distributor summaries.
直接替換替代品，適用於 AD779JN — 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： AD779JN （相同外形與佔位） — 差異在於 Number of Input Channels, Package.
AD779KN
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD779KR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD779KD
✅ 直接替換聯絡詢價
查看資料表 →AD779BN
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD779TR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD779JN 最大額定值與電氣特性
| ADC Type | Complete monolithic sampling ADC |
| 解析度 | 14 bit |
| 取樣率 | 128 kSPS |
| Number of Input Channels | 1 channel |
| Input Architecture | Single-ended input |
| Sample-and-Hold Amplifier | Integrated |
| Digital Interface | 14-bit microprocessor-compatible parallel bus |
| Voltage Reference | Integrated internal voltage reference |
| Clock Generation | Integrated clock-generation circuitry |
| Process Technology | Analog Devices BiMOS monolithic technology |
| 封裝 | 28-pin PDIP |
| 安裝類型 | Through-hole |
AD779JN 28-pin pdip 腳位配置指南
AD779JN（28-pin pdip 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： AD779JN.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD779JN 適用於 6 應用s: Industrial Process Monitoring, Precision Sensor Signal Acquisition, Laboratory Data Acquisition, Audio and General Signal Processing, Microcontroller-Controlled Measurement, Retrofit and Long-Lifecycle Instrumentation.
Industrial Process Monitoring
The AD779JN fits industrial process-monitoring designs that require more resolution than a basic 12-bit controller ADC while retaining a manageable 128 kSPS sampling rate. Its 14-bit conversion word and integrated sample-and-hold amplifier allow a conditioned transducer signal to be captured directly for digital filtering or control. The single input channel and 28-pin PDIP package also simplify retrofit designs built around a microprocessor-compatible parallel bus. The ADC should be placed near the sensor interface, with its analog and digital return paths planned to prevent switching noise from corrupting the conversion. Before deployment, verify the input range, supply voltage, operating temperature, reference accuracy, and acquisition timing in the manufacturer datasheet.
推薦
Precision Sensor Signal Acquisition
The AD779JN is appropriate for sensor front ends that produce low-level analog voltages and require deterministic digital results. Its integrated sample-and-hold amplifier supports acquisition at up to 128 kSPS, while the 14-bit resolution provides 16,384 output codes for representing the measured signal. A parallel interface can transfer each result efficiently into a microprocessor, FPGA, or data-acquisition controller. Because the converter also integrates a voltage reference and clock-generation circuitry, the system can be designed around a compact analog front end. The final circuit still needs verified input-range, reference-voltage, and supply-limit values, plus careful grounding and bypass-capacitor placement according to the official application guidance.
推薦
Laboratory Data Acquisition
The AD779JN can serve as the conversion element in a laboratory data-acquisition system requiring 14-bit resolution and moderate-to-high sampling throughput. Its 128 kSPS rate is adequate for many slow and medium-bandwidth signals, while the microprocessor-compatible parallel bus supports direct acquisition-controller access. Integrating the sample-and-hold amplifier, voltage reference, and clock-generation circuitry can simplify the analog subsystem and reduce external assembly. For instrumentation, the analog input should be protected and referenced in a manner consistent with the datasheet, and the PCB should separate sensitive input routing from digital bus activity. Calibration strategy, input bandwidth, reference stability, and acquisition timing must be confirmed from the manufacturer documentation before measurement accuracy is specified.
推薦
Audio and General Signal Processing
The AD779JN can be used in audio or general signal-processing paths that require more than 12-bit dynamic range but do not require a very high conversion rate. Its 14-bit resolution and 128 kSPS maximum sampling rate support digital capture of analog waveforms, while the characterized signal-to-noise-plus-distortion, total-harmonic-distortion, and intermodulation-distortion parameters allow signal-chain designers to evaluate performance. The Analog Devices family information specifically identifies these dynamic specifications as important for signal-processing applications. Engineers should confirm the permitted input bandwidth and acquisition behavior, establish suitable analog scaling, and use the recommended grounding and reference arrangement. The official datasheet is required to determine whether the available dynamic range satisfies the intended audio or instrumentation noise target.
推薦
Microcontroller-Controlled Measurement
The AD779JN is well suited to measurement systems controlled by a microprocessor or other parallel-bus controller. Its 14-bit parallel interface presents the conversion result directly to digital logic, avoiding a serial-conversion stage, while the internal sample-and-hold amplifier, voltage reference, and clock circuitry reduce the number of external blocks. The 128 kSPS capability provides substantial throughput for sensor monitoring and control loops. System timing must account for acquisition, conversion, and data-access intervals specified by Analog Devices. Because no verified pin-level timing table or supply limits were included in the supplied results, the controller design should not be released until the official datasheet confirms logic thresholds, settling requirements, and power sequencing.
推薦
Retrofit and Long-Lifecycle Instrumentation
The AD779JN’s 28-pin PDIP package is useful for instruments and test equipment built around through-hole analog boards. It combines a complete monolithic conversion path, including the sample-and-hold amplifier, reference, clock circuitry, and digital interface, within one standard DIP footprint. This can simplify repair, qualification, and subsystem replacement compared with a discrete converter implementation. The Analog Devices product information states that some AD779 versions are available in versions compliant with MIL-STD-883, but the exact compliance status of the AD779JN ordering code must be checked rather than inferred. For long-lifecycle equipment, review the current lifecycle status, grade-specific temperature range, dated specifications, and availability with the manufacturer or an authorized distributor.
推薦
推薦產品摘要
工程參考資料，適用於 AD779JN — 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 | AD779KN | AD779KR | AD779KD | AD779BN | AD779TR |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-PDIP | 28-PDIP | 28-PDIP | 28-PDIP | 28-PDIP | 28-PDIP |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Sampling Rate | 128 kSPS | 128 kSPS | 128 kSPS | 128 kSPS | 128 kSPS | 128 kSPS |
| Number of Input Channels | 1 channel | 1 channel | 1 channel | 1 channel | 1 channel | 1 channel |
| Digital Interface | 14-bit microprocessor-compatible parallel bus | AD779-family parallel bus | AD779-family parallel bus | AD779-family parallel bus | AD779-family parallel bus | AD779-family parallel bus |
| Integrated Functions | SHA, voltage reference, clock generation, and parallel interface | SHA, voltage reference, clock generation, and parallel interface | SHA, voltage reference, clock generation, and parallel interface | SHA, voltage reference, clock generation, and parallel interface | SHA, voltage reference, clock generation, and parallel interface | SHA, voltage reference, clock generation, and parallel interface |
主要差異化特點
- Complete monolithic conversion function (對比AD779KD)
- Same-family electrical architecture (對比AD779KN)
- Parallel microprocessor interface (對比AD779BN)
- Through-hole 28-pin PDIP implementation (對比AD779TR)
設計說明
Follow the Analog Devices recommended application circuit for input conditioning, reference connections, and bypass capacitors. Keep the AD779JN close to the signal source when the source impedance is appreciable, because the integrated sample-and-hold amplifier and input network must settle within the acquisition interval specified in the datasheet. Route the 14-bit parallel bus away from the analog input and reference paths, and provide a continuous ground plane beneath the device while routing high-current digital return currents away from the sensitive analog area.
Use the manufacturer’s timing values for chip-select, read, conversion-start, and output-data control rather than treating the 14-bit bus as a generic parallel interface. Account for setup and hold requirements, output settling, and the time available for acquisition at the selected conversion rate. Series termination may be evaluated if ringing appears on fast digital transitions, but source termination, trace loading, and the controller output timing should be validated together rather than tuned independently.
Do not assume that identical resolution and sampling rate make every AD779 suffix interchangeable. The Analog Devices family information identifies K, B, and T grades, which can differ in characterized AC performance, DC accuracy, environmental limits, and qualification. For any proposed replacement, compare the exact suffix against the original design’s temperature range, reference requirements, acquisition timing, and test limits. Also verify the 28-pin PDIP pinout and package drawing from the official datasheet before approving a footprint or substituting the part.
合規資訊
The Analog Devices product information states that some AD779 versions are available in versions compliant with MIL-STD-883, but the supplied data does not establish that status for the AD779JN ordering code. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status remain unknown.