AD679AJ - 14-Bit 128 kSPS Complete Sampling ADC | Analog Devices
MPN: AD679AJ ✓ NakahandaAD679AJ Ulas
A complete sampling ADC is a data-conversion IC that acquires an analog input, holds it at a stable level during conversion, and produces a corresponding digital code. Within the broader hierarchy of semiconductor components, the AD679AJ is an ADC, a data-converter IC, and a signal-processing component. Its integrated reference, clock circuitry, and sample-and-hold amplifier reduce the number of external support components required in traditional instrumentation and signal-processing designs.
The principal verified specifications are 14-bit resolution, a maximum conversion rate of 128 kSPS, single-ended analog input operation, and flash-converter architecture. The manufacturer also states that the AD679 is specified for signal processing applications where dynamic AC parameters are important. These characteristics make the device suitable for industrial measurement, communications, instrumentation, and other systems requiring accurate periodic conversion of a single analog input.
The AD679 architecture combines the sampling function and conversion function on a monolithic chip. Its microprocessor-compatible bus supports digital integration with processors, while the internal voltage reference and clock-generation circuitry provide a more complete converter subsystem than a bare flash ADC. The manufacturer further identifies the AD679 as having the same pinout as the 12-bit, 200 kSPS AD678 ADC, creating a useful migration path when higher resolution is required.
Typical applications include sampled measurement of analog sensors, waveform acquisition, communications signal processing, precision instrumentation, and embedded control systems. In each case, the 128 kSPS rate determines how rapidly the input can be sampled, while 14-bit resolution determines the number of discrete quantization levels represented by each conversion result. The internal sample-and-hold amplifier is particularly useful when the source impedance and acquisition timing require the input to remain stable during conversion.
A critical design consideration is the relationship between input range, reference accuracy, acquisition time, and source impedance. The application circuit must present the analog input within the converter's specified range and provide sufficient settling time before each conversion. Designers should also preserve clean supply and ground connections because dynamic ADC performance depends on the complete signal chain, not only on nominal resolution and conversion-rate specifications.
This product record combines the verified 14-bit, 128 kSPS ADC positioning with practical guidance on selection, application fit, comparison, and drop-in availability. It also identifies the documented AD679 upgrade relationship to the AD678 and clearly separates verified manufacturer data from parameters that require confirmation from the complete datasheet.
Mga alternatibo na pwedeng ilagay na AD679AJ — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok AD679AJ (parehas na form factor at footprint) — pagkakaiba sa Architecture, Input Type, Interface, Package, Resolution.
AD679BJ
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →AD679JNZ
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
AD679KNZ
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
AD679AJ Mga Pinakamataas na Rating at Electrical Characteristics
| ADC Type | Complete sampling ADC |
| Pangangasiwaan | 14 bit |
| Conversion Rate | 128 kSPS |
| Architecture | Flash |
| Input Channel Count | 1 |
| Input Type | Single-ended |
| Sample-and-Hold Amplifier | Integrated |
| Interface | Microprocessor-compatible bus |
| Voltage Reference | Integrated |
| Clock Generation | Integrated |
| Packhaging | 44-JLCC, 16.39 x 16.39 mm |
Gabay sa Pin Configuration ng AD679AJ 44-jlcc, 16.39 x 16.39 mm
Pin configuration para sa AD679AJ (44-jlcc, 16.39 x 16.39 mm package). Ang analog component na ito ay may input, output, at power supply pins. Sumangguni sa datasheet ng manufacturer para sa offset null, compensation, at enable pin configurations. Perpekto para sa signal conditioning at amplifier circuits.
Wala ng detalyadong pinout data na magagamit para sa AD679AJ.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
AD679AJ ay nararapat para sa 6 aplikasyons: Industrial Process Measurement, Precision Instrumentation, Communications Signal Processing, Sensor Acquisition and Monitoring, Waveform Data Acquisition, Embedded Control and Data Logging.
Industrial Process Measurement
The AD679AJ fits industrial process-measurement channels that need a 14-bit result and a maximum sampling rate of 128 kSPS. Its integrated sample-and-hold amplifier allows the converter to acquire a sensor signal, while the internal voltage reference and clock-generation circuitry reduce the number of separate analog support blocks. The microprocessor-compatible bus provides a direct path to a digital controller. Designers should still verify the input range, acquisition time, and operating temperature against the sensor and factory environment. Analog signal conditioning, source-impedance limits, grounding, and supply decoupling remain important because converter resolution does not compensate for an unsuitable front end.
Inirekomenda
Precision Instrumentation
AD679AJ is appropriate for precision laboratory and test-instrument front ends where 14-bit resolution and dynamic performance are useful for recovering a low-level analog signal. The integrated sample-and-hold stage stabilizes the input during conversion, and the integrated reference and clock circuitry support a more self-contained converter design. At 128 kSPS, the device can support high-rate data capture while leaving signal-processing bandwidth to the following stages. The system designer must confirm noise, distortion, input bandwidth, and settling-time limits from the complete data sheet. Layout should minimize loop area around the analog input and maintain a clean return path between the converter and supporting components.
Inirekomenda
Communications Signal Processing
The AD679AJ can be used in communications and signal-processing subsystems that require periodic conversion of a single-ended analog waveform. Its 14-bit quantization gives 16,384 possible digital codes, while the 128 kSPS maximum rate supports data acquisition at relatively high sampling throughput. The integrated sample-and-hold amplifier is useful when a burst of samples is required, although acquisition time and input bandwidth must be checked against the carrier or modulation bandwidth. The microprocessor-compatible interface allows sampled data to be transferred into a digital processor. Designers should account for aliasing, reference noise, clock jitter, and analog filtering rather than relying on nominal converter resolution alone.
Inirekomenda
Sensor Acquisition and Monitoring
AD679AJ suits sensor acquisition systems requiring more precision than a basic 8-bit or 12-bit converter while retaining a straightforward digital interface. The integrated sample-and-hold amplifier reduces the external circuitry needed to capture a changing sensor output, and the 128 kSPS rate allows rapid monitoring of suitable dynamic signals. For slow sensors, the converter still requires an appropriate acquisition strategy to satisfy settling requirements. A practical design should condition and protect the sensor signal before it reaches the input, isolate high-impedance sources where necessary, and validate the analog input range against the ADC supply arrangement. Firmware can then use the resulting 14-bit codes for thresholding, trending, or control feedback.
Inirekomenda
Waveform Data Acquisition
The AD679AJ is applicable to single-channel waveform capture where 14-bit amplitude resolution and a 128 kSPS maximum conversion rate are sufficient. Its complete sampling architecture consolidates the sample-and-hold amplifier, voltage reference, clock-generation circuitry, and conversion logic, which can simplify analog subsystem planning. The resulting digital stream can be processed by a microcontroller or other digital engine through the microprocessor-compatible bus. The main engineering constraints are acquisition time, analog input bandwidth, aliasing, and the amount of digital storage required. Anti-alias filtering should be selected before the input bandwidth limit is reached, while clock and layout choices should preserve the converter's dynamic performance.
Inirekomenda
Embedded Control and Data Logging
AD679AJ can serve as the analog measurement engine in an embedded controller that records or acts on a single analog input. Its 14-bit codes provide finer quantization than lower-resolution converters, and the integrated reference and clock circuitry can reduce component count compared with a discrete ADC implementation. The 128 kSPS capability is useful when control loops or monitoring tasks need rapid updates rather than occasional slow readings. The processor interface must be configured to match the device timing, and software should discard samples taken during settling or acquisition where the front end requires it. Accurate implementation also depends on validating reference accuracy, supply behavior, grounding, and input protection under the target environmental conditions.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for AD679AJ — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | AD679BJ | AD679JNZ | AD679KNZ |
|---|---|---|---|---|
| Manufacturer | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 44-JLCC (16.39 x 16.39 mm) | 44-JLCC | 44-JLCC | 44-JLCC |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit |
| Conversion Rate | 128 kSPS | 128 kSPS | 128 kSPS | 128 kSPS |
| Architecture | Flash | Flash | Flash | Flash |
| Input Configuration | 1 single-ended input | 1 single-ended input | 1 single-ended input | 1 single-ended input |
| Integrated Functions | Sample-and-hold amplifier, voltage reference, clock generation, microprocessor-compatible interface | Sample-and-hold amplifier, voltage reference, clock generation, microprocessor-compatible interface | Sample-and-hold amplifier, voltage reference, clock generation, microprocessor-compatible interface | Sample-and-hold amplifier, voltage reference, clock generation, microprocessor-compatible interface |
Pangunahing mga Pagkakaiba
- Higher resolution than the same-pinout AD678 (kumpara saAD678)
- AD679 family provides a documented conversion-rate trade-off (kumpara saAD678)
- Complete sampling converter integration (kumpara saAD679JNZ)
- Exact ceramic-package selection for sensitive systems (kumpara saAD679KNZ)
Talaan ng Disenyo
Use the current Analog Devices data sheet for the exact 44-JLCC footprint and complete pin map before routing the PCB. Keep the analog input trace short, place any input network close to the relevant pins, and avoid routing digital bus or clock signals immediately beneath the sensitive input path. Provide a direct, low-impedance ground return for the converter and analog conditioning circuitry. Because the verified data does not include the complete pin table or layout recommendations, no pin-specific decoupling values should be assumed.
Follow the supply-voltage and power-sequencing requirements in the current manufacturer data sheet rather than deriving them from the AD678 comparison. Decouple each required supply rail at the IC with the capacitor type and value specified by Analog Devices, and route the connections using short ground returns. The verified excerpts identify ±12 V and +5 V test conditions but do not establish the complete operating limits, so those values must not be treated as allowable supply combinations without confirmation.
Validate the source impedance, acquisition time, and analog bandwidth before selecting the sampling rate. The AD679AJ integrates a sample-and-hold amplifier and can convert at up to 128 kSPS, but those ratings do not guarantee that every source will settle within the available acquisition interval. Place anti-alias filtering before the ADC input and verify the resulting signal bandwidth against the converter specifications. For noisy or high-impedance sources, use buffering and a defined return path rather than relying on the converter alone.
Do not treat the AD678 as an unqualified drop-in replacement merely because the manufacturer states that the AD679 has the same pinout. The AD678 is identified as 12-bit and 200 kSPS, while the AD679AJ is 14-bit and 128 kSPS. Also verify suffix-specific temperature grade, package, MIL-STD-883 status, and ordering information. The supplied web excerpts do not establish every operating limit, so undocumented values should be confirmed in the current manufacturer data sheet before schematic or production release.
Impormasyon ng Pagsunod sa Kautusan
The verified AD679 product information states that the AD679 is available in versions compliant with MIL-STD-883 and refers to the Analog Devices Military Products Databook or current AD679/883B data sheet. It does not explicitly state the compliance status of AD679AJ. RoHS, REACH, lead-free, halogen-free, conflict-minerals, and AEC-Q100 status therefore remain unknown.
