AD679JD - 14-Bit 128 kSPS ADC | Analog Devices | Data Conversion
MPN: AD679JD ✓ ActiveAD679JD Overview
An ADC is a data-converter category that transforms a continuous analog voltage into a digital numerical representation. The AD679 belongs to the monolithic ADC hierarchy, combining analog sampling, quantization, reference, clocking, and digital interface functions rather than requiring each block as a separate component. Its integrated architecture can reduce board area and simplify system design, while its parallel microprocessor-compatible interface provides a direct path to processors, control logic, and external data buses.
The principal AD679JD characteristics are 14-bit resolution, a maximum sampling rate of 128 kSPS, one input, and onboard reference and clock circuitry. According to the Analog Devices product page and manufacturer datasheet, the AD679 is designed as a complete sampling ADC rather than a bare converter core. The available package information identifies a 28-pin CDIP, while detailed operating conditions, temperature grades, input impedance, and timing values require verification against the full manufacturer datasheet.
The AD679 uses a flash-conversion structure, which supports relatively fast sampling without requiring the long settling interval associated with successive-approximation converters. Its 14-bit output provides 16,384 discrete code levels. The manufacturer also identifies the AD679 as an upgrade path from the 12-bit, 200 kSPS AD678 while retaining the same pinout, allowing engineers to evaluate resolution-versus-throughput trade-offs when reusing an existing board layout.
Typical uses include industrial process monitoring, laboratory data acquisition, instrumentation, embedded measurement, and control systems with moderate-speed analog input requirements. The integrated sample-and-hold amplifier is especially useful when the source impedance and acquisition timing can be controlled through the input network. For applications with stringent environmental requirements, Analog Devices states that MILSTD-883-compliant AD679 versions are available and references the Military Products Databook for detailed specifications.
Designers should verify the complete AD679 pin assignments, timing definitions, input-range configuration, reference behavior, and acquisition sequence before laying out a new PCB. Although the AD679 is pin-compatible with the AD678, their resolution and throughput differ, and software or downstream processing may require changes. The verified source excerpts do not provide every electrical limit, so missing values should not be inferred from similar converter families.
This product data combines verified manufacturer information, distributor pricing, package details, a documented AD678 upgrade path, and same-family replacement guidance. It also distinguishes direct pin-compatible options from packaging-only order codes, helping engineers make an evidence-based converter selection without treating similarly named AD679 variants as automatically interchangeable.
Drop-in alternatives for AD679JD — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
AD679JNZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD679KNZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD679TD/883B
✅ Drop-In📋 Reference alternative (not in catalog)
AD679JD Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Sampling Rate | 128 kSPS |
| Architecture | Flash |
| Number of Inputs | 1 input |
| Converter Type | Monolithic sampling ADC |
| Sample-and-Hold Amplifier | Integrated |
| Digital Interface | Microprocessor-compatible parallel bus |
| Internal Voltage Reference | Integrated |
| Internal Clock Generation | Integrated |
| Input Voltage | 10 V or ±5 V |
| Maximum Power Dissipation | 745 mW |
| Package | 28-pin CDIP |
| Mounting Type | Through-hole |
| Number of Output Code Levels | 16,384 |
| AD678 Pin Compatibility | Same pinout |
| AD678 Resolution Comparison | AD679: 14 bit; AD678: 12 bit |
| AD678 Sampling Rate Comparison | AD679: 128 kSPS; AD678: 200 kSPS |
| Military Version Availability | Available in versions compliant with MILSTD-883 |
AD679JD 28-pin cdip Pin Configuration Guide
Pin configuration for AD679JD (28-pin cdip package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for AD679JD.
Refer to the datasheet for full pin configuration.
Typical Applications
AD679JD is suitable for 6 applications: Industrial Process Measurement, Laboratory Data-Acquisition Systems, Legacy Control-System Upgrade, Instrumentation and Sensor Interfaces, Embedded Test and Measurement, Military and Ruggedized Acquisition.
Industrial Process Measurement
The AD679JD fits industrial process-measurement systems that sample a conditioned analog signal at moderate speed and require 14-bit numerical resolution. Its 128 kSPS flash-conversion rate provides a practical balance between acquisition speed and resolution, while the integrated sample-and-hold amplifier, voltage reference, and clock circuitry reduce the number of separate analog functions. The 28-pin CDIP package also supports older industrial control hardware with through-hole PCB layouts. The converter's 16,384 code levels provide substantially more measurement granularity than a 12-bit ADC, although sensor conditioning, isolation, surge protection, and calibration must be engineered around the complete Analog Devices datasheet.
Recommended
Laboratory Data-Acquisition Systems
AD679JD is suitable for laboratory instruments that acquire one analog channel at up to 128 kSPS and need 14-bit data without assembling a separate reference, clock, and sample-and-hold circuit. The integrated block reduces analog front-end complexity and helps maintain a repeatable measurement chain. In a bench instrument, the converter's 16,384 available code levels can support precision signal capture when paired with suitable input conditioning. Designers should budget sufficient acquisition time for the source impedance and verify the manufacturer's timing diagrams before choosing the sampling rate. Legacy parallel processor or controller connections are supported by the microprocessor-compatible bus interface.
Recommended
Legacy Control-System Upgrade
The AD679 can serve as a resolution-focused upgrade for a control board designed around the 12-bit, 200 kSPS AD678 because Analog Devices states that the AD679 provides the same pinout. AD679JD raises resolution from 12 to 14 bits while reducing maximum sampling rate from 200 to 128 kSPS. This is advantageous when fine measurement granularity matters more than maximum throughput, but firmware, scaling, acquisition timing, and downstream calibration must be reviewed. The 28-pin CDIP package preserves the physical architecture of suitable through-hole designs while avoiding a PCB footprint change.
Recommended
Instrumentation and Sensor Interfaces
AD679JD is appropriate for instrumentation that converts a conditioned transducer or analog sensor output into a 14-bit digital measurement. The integrated sample-and-hold amplifier accepts a single input, while the onboard reference and clock-generation circuitry simplify implementation compared with a converter-only solution. Its 128 kSPS rate is well matched to many pressure, temperature, position, and slow-dynamic industrial signals after appropriate filtering. Signal-chain error must be controlled separately because converter resolution does not remove sensor error, reference drift, noise, or analog-conditioning nonlinearity. The verified source confirms 10 V or ±5 V input options, but exact input-mode configuration should be selected from the manufacturer datasheet.
Recommended
Embedded Test and Measurement
The AD679JD can be used in embedded test equipment where a 14-bit converter, acquisition circuit, reference, and clock are required in a relatively compact through-hole device. A 128 kSPS sampling rate supports fast measurement loops while retaining 16,384 quantization levels. The microprocessor-compatible parallel interface can connect to suitable control logic without an external SPI or serial conversion stage. Engineers should ensure that the downstream processor has compatible logic levels and sufficient bus timing margin. Because the verified excerpts omit detailed acquisition, settling, and propagation-delay values, the system timing must be established from the full manufacturer datasheet rather than estimated.
Recommended
Military and Ruggedized Acquisition
AD679-family converters are relevant to military and ruggedized acquisition systems because Analog Devices confirms that MILSTD-883-compliant versions are available. The standard AD679JD provides the core 14-bit, 128 kSPS conversion function in a 28-pin CDIP, while the AD679TD/883B candidate represents a documented compliant ordering path. Program engineers must define the exact screening, qualification, documentation, traceability, and procurement requirements before selecting the military variant. The converter's ceramic DIP package and integrated reference, clock, and sample-and-hold functions simplify a rugged analog chain, but environmental and screening details must come from the current military data sheet.
Recommended
Recommended Products Summary
Engineering reference data for AD679JD — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD679JNZ | AD679KNZ | AD679TD/883B |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-pin CDIP | 28-pin CDIP | 28-pin CDIP | 28-pin CDIP |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit |
| Sampling Rate | 128 kSPS | 128 kSPS | 128 kSPS | 128 kSPS |
| Architecture | Flash | Flash | Flash | Flash |
| Number of Inputs | 1 input | 1 input | 1 input | 1 input |
| Integrated Functions | SHA, microprocessor-compatible interface, voltage reference, and clock generation | SHA, microprocessor-compatible interface, voltage reference, and clock generation | SHA, microprocessor-compatible interface, voltage reference, and clock generation | SHA, microprocessor-compatible interface, voltage reference, and clock generation |
Key Differentiators
- Higher resolution than the documented AD678 upgrade-path family (vs AD678)
- Complete integrated conversion subsystem (vs AD679JNZ)
- Documented military-family option for qualified programs (vs AD679TD/883B)
- Direct path from 12-bit to 14-bit acquisition (vs AD678)
Design Notes
Do not treat every similarly named AD679 ordering code as an automatic substitution. The supplied sources identify AD679JNZ, AD679KNZ, and AD679TD/883B as replacement candidates, but they do not fully document temperature grade, screening, package material, or qualification for every code. Compare the complete ordering information, verify the 28-pin CDIP pin assignments, and confirm that acquisition timing and digital logic requirements remain unchanged before approving a substitution.
Although the AD679 integrates a sample-and-hold amplifier, voltage reference, and clock circuitry, the analog source impedance still affects acquisition accuracy. The verified excerpts do not include acquisition-time or input-capacitance limits, so do not guess a minimum settling interval. Use the manufacturer's timing diagrams to determine the required acquisition period, place input conditioning close to the converter, and validate settling at the highest input frequency and lowest expected source impedance.
Legacy 28-pin CDIP designs should be laid out around the exact manufacturer pin diagram rather than the AD678 pinout by memory. The AD679 is documented as sharing the AD678 pinout, which permits board reuse, but signal names, supply pins, control functions, and analog-ground assignments must be checked against the current AD679 data sheet. Keep analog and digital return paths separated as shown in the recommended application circuit and validate the completed board for grounding and reference-noise problems.
The verified AD679JD listing reports a maximum power dissipation of 745 mW, but operating dissipation depends on supply voltage, analog-input level, digital-output state, and ambient temperature. Do not use the maximum rating as an unconditional operating target. Review the complete electrical characteristics for worst-case supply and output conditions, provide the manufacturer's recommended bypass capacitors, and calculate copper and through-hole thermal performance for the ceramic DIP package in the final enclosure.
Compliance Information
The verified manufacturer excerpt confirms that AD679 versions compliant with MILSTD-883 are available and refers engineers to the Analog Devices Military Products Databook or current AD679/883B data sheet. No verified RoHS, REACH, lead-free, halogen-free, or conflict-minerals statement was provided for AD679JD. AEC-Q100 is not applicable because this is an analog data-converter product rather than an automotive-qualified device.
