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Analog Devices Inc. AD679KNZ
- Part No.:
- AD679KNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD679KNZ.pdf
- Description:
- IC ADC 14BIT FLASH 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,947
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Product details
Overview
AD679KNZ from Analog Devices is a complete 14-bit, 128 kSPS monolithic sampling ADC integrating sample-and-hold amplifier (SHA), internal 5 V reference, clock generator, and 8-bit bus interface in a 28-lead plastic DIP package. It delivers 78 dB S/N+D (K grade), 1 MHz full-power bandwidth, and 10 MΩ input impedance for direct connection to unbuffered sources in precision data acquisition systems.
For engineers reviewing the AD679KNZ datasheet, AD679KNZ pinout, AD679KNZ application, or AD679KNZ equivalent, key selection considerations include its bipolar/unipolar dual-mode operation, two-read 14-bit output format, factory-trimmed dc accuracy (±1 LSB INL, ±0.11% FSR gain error), and MIL-STD-883-compliant variants for ruggedized deployments.
Technical Context
The AD679KNZ employs a recursive subranging architecture with flash converter circuitry and on-chip error correction to achieve 14-bit resolution at 128 kSPS. Its SHA supports 1.5 µs input settling time and 150 ps aperture jitter, enabling accurate digitization of signals up to 500 kHz full-linear bandwidth.
It operates from +5 V (VDD), ±12 V (VCC/VEE) supplies, dissipating 560 mW typical. The device features TTL/CMOS-compatible digital I/O, three-state outputs, and configurable synchronous/asynchronous conversion control via SYNC, CS, SC, and EOCEN pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees 16,384 distinct output codes for high-fidelity signal representation. |
| Sampling Rate | 128 kSPS - enables real-time capture of baseband signals up to 64 kHz Nyquist frequency. |
| S/N+D Ratio | 78 dB (K grade) - ensures ≥12.7 effective bits of dynamic resolution at –0.5 dBFS input. |
| Full-Power Bandwidth | 1 MHz - supports accurate digitization of fast transients without amplitude loss. |
| Input Impedance | 10 MΩ - allows direct interface to high-impedance sensors or multiplexers without loading error. |
| Reference Voltage | 5.00 V ±20 mV - stable on-chip reference enables consistent 10 V full-scale range in unipolar mode. |
| Supply Voltages | +5 V (VDD), +12 V (VCC), –12 V (VEE) - triple-rail operation isolates analog and digital domains. |
Pinout & Package
AD679KNZ is housed in a 28-lead plastic DIP (N-28) package with 0.6-inch width and through-hole mounting. Pin 1 identifier is marked with a notch or dot; pin 14 and pin 15 are DGND and HBE respectively. Unused pins (16–18) must be tied to DGND.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| AIN (6) | Analog Input | High-impedance (10 MΩ) node accepting 0–10 V unipolar or –5–+5 V bipolar full-scale signals. |
| BIPOFF (10) | Mode Configuration | Tie to AGND for unipolar mode (straight binary); tie to REFOUT for bipolar mode (twos complement). |
| REFIN (9)/REFOUT (8) | Reference Interface | REFIN accepts external 5 V reference; REFOUT provides 5.00 V ±20 mV output for internal use or external biasing. |
| SC (3) & EOCEN (1) | Conversion Control | Active-low SC initiates conversion; EOCEN gates EOC output state-both require proper SYNC configuration. |
| DB7–DB0 (19–26) | Data Bus | 8-bit bidirectional bus delivering 14-bit result in two reads: high byte first (HBE = LOW), then low byte (HBE = HIGH). |
| AGND (7) & DGND (12,14) | Ground Separation | Dedicated analog and digital grounds minimize noise coupling between precision analog front-end and digital interface. |
Key Features
| Feature | Design Value |
|---|---|
| Complete On-Chip Integration | Eliminates need for external clock, reference, SHA, or interface logic-reduces BOM count and layout complexity. |
| Factory Laser-Trimmed Accuracy | Guarantees ±1 LSB INL and ±0.11% FSR gain error (K grade) without user calibration or trimming resistors. |
| Configurable Timing Mode | SYNC pin selects synchronous (CS-gated) or asynchronous (CS-independent) operation-enables flexible system timing integration. |
| Bipolar/Unipolar Dual-Mode Support | Single hardware platform serves both signed (–5 V to +5 V) and unsigned (0 V to +10 V) measurement ranges via BIPOFF pin. |
| MIL-STD-883 Compliance Option | Screened versions (e.g., AD679KNZ/883B) support aerospace, defense, and industrial applications requiring extended reliability validation. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous acquisition of sensor outputs (thermocouples, strain gauges, pressure transducers) in PLC-based control cabinets with ambient temperatures up to +70°C. IC Role / Device Role / Timing Role: Primary sampling ADC performing 128 kSPS conversions with 10 MΩ input impedance to avoid signal degradation across long sensor wiring. Use Value: Factory-trimmed dc accuracy (±0.07% FSR zero error) ensures traceable measurement integrity without field recalibration. |
Use Scenario: Digitizing waveform outputs from arbitrary function generators and spectrum analyzers in benchtop instruments. IC Role / Device Role / Timing Role: High-fidelity acquisition front-end supporting 1 MHz full-power bandwidth and 78 dB S/N+D for spectral purity analysis. Use Value: Low aperture jitter (150 ps) preserves phase coherence in multi-tone IMD testing at 128 kSPS sampling rate. |
| Medical Diagnostic Imaging | Aerospace Data Acquisition |
|
Use Scenario: Signal conditioning in portable ultrasound beamformers where low power and compact size are critical. IC Role / Device Role / Timing Role: 14-bit digitizer interfacing directly to analog beamformer channels with minimal external components. Use Value: Integrated 5 V reference and clock reduce component count and PCB area while maintaining ±1 LSB linearity over temperature. |
Use Scenario: Flight test instrumentation capturing vibration, temperature, and pressure data in avionics bays operating from –55°C to +125°C. IC Role / Device Role / Timing Role: Ruggedized ADC variant (T grade) providing guaranteed performance across extreme thermal cycles. Use Value: MIL-STD-883-compliant screening ensures long-term reliability under shock, vibration, and radiation exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD678KNZ | 12-bit, 200 kSPS, same 28-pin DIP footprint but lower resolution and no guaranteed dc specs for J/A/S grades. | Higher throughput required where 12-bit resolution suffices (e.g., audio monitoring, basic telemetry). | Select AD678KNZ only when speed > resolution priority and dc accuracy is not mission-critical. |
| ADS8505IPFB | 16-bit, 250 kSPS, SPI interface, single +5 V supply, no internal reference-requires external precision reference and driver. | Modern embedded designs needing higher resolution and simplified power architecture, but with added external component burden. | Choose ADS8505IPFB for new designs targeting >14-bit fidelity and digital-only supply; retain AD679KNZ for legacy analog-system compatibility. |
Compared with AD678KNZ and ADS8505IPFB, the AD679KNZ uniquely balances 14-bit resolution, integrated reference/clock, and proven industrial-grade dc accuracy in a drop-in-compatible DIP package-making it optimal for upgrading existing 12-bit systems without board redesign.
Availability
AD679KNZ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, medical diagnostic imaging, and aerospace data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD679KNZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD679 belongs to Analog Devices' precision data acquisition product line, engineered for applications demanding guaranteed dc accuracy, low noise, and seamless integration of analog front-end functions into single-chip solutions.
FAQ
What is the operating temperature range for the AD679KNZ?
The AD679KNZ is rated for 0°C to +70°C operation (K grade). Its dc specifications-including ±1 LSB INL and ±0.11% FSR gain error-are fully guaranteed across this range. The part uses Analog Devices' BiMOS process to ensure stability and low drift, with temperature coefficients specified for zero and gain errors in the datasheet's DC SPECIFICATIONS table.
Does the AD679KNZ require external calibration components?
No, the AD679KNZ does not require external calibration components for standard operation. It is factory laser-trimmed for offset, gain, and linearity. In unipolar mode, only a single 50 Ω 1% resistor is needed if fine adjustment is desired; bipolar mode requires two such resistors. For most applications meeting K-grade specs, no external trims are necessary.
How is the 14-bit data output structured on the AD679KNZ?
The AD679KNZ outputs its 14-bit result across DB7–DB0 in two sequential 8-bit reads: first the high byte (bits 13–6), then the low byte (bits 5–0), left-justified in a 16-bit word. HBE pin controls byte selection-LOW enables high byte, HIGH enables low byte. Data format is straight binary in unipolar mode and twos complement in bipolar mode.
Can the AD679KNZ operate with a single +5 V supply?
No, the AD679KNZ requires three separate supplies: +5 V (VDD) for digital logic, +12 V (VCC) for the analog positive rail, and –12 V (VEE) for the analog negative rail. This triple-supply architecture isolates analog signal paths from digital noise and enables true bipolar input operation. Operating outside these rails violates absolute maximum ratings and risks permanent damage.
Is the AD679KNZ pin-compatible with other members of the AD67x family?
Yes, the AD679KNZ is pin-compatible with the AD678 12-bit, 200 kSPS ADC in the same 28-lead DIP package. This allows direct hardware replacement in existing designs where higher resolution is needed without PCB layout changes. However, timing parameters (e.g., conversion time, access time) differ and must be verified in the target system.
AD679KNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 128k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±12V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD679KNZ FAQ
1.How can I place an order for AD679KNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD679KNZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD679KNZ reliable?
The price and inventory of AD679KNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD679KNZ is usually 5 days.
3.What payment methods are accepted for AD679KNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD679KNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD679KNZ?
AD679KNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD679KNZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD679KNZ?
For technical support, including AD679KNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD679KNZ requirements.
6.How does Aetrix verify that AD679KNZ is sourced from the original manufacturer or authorized distributors?
All AD679KNZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD679KNZ meets industry standards.
7.What is the process for return or replacement of AD679KNZ?
All AD679KNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD679KNZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD679KNZ part is unused and in its original packaging.
Return procedure for AD679KNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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