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Analog Devices Inc. AD779KNZ
- Part No.:
- AD779KNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD779KNZ.pdf
- Description:
- IC ADC 14BIT 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,107
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Product details
Overview
AD779KNZ from Analog Devices is a complete 14-bit, 128 kSPS sampling analog-to-digital converter with integrated sample-hold amplifier, 5 V reference, clock generator, and 16-bit bus interface. It delivers 80 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 AD779KNZ datasheet, AD779KNZ pinout, AD779KNZ application, or AD779KNZ equivalent, key selection criteria include bipolar/unipolar mode support, ±12 V/5 V dual-supply operation, factory-trimmed DC accuracy, MIL-STD-883-compliant variants, and compatibility with TMS320C25 and 80186 microprocessor buses.
Technical Context
The AD779KNZ employs a recursive subranging architecture with flash converter circuitry and error correction to achieve 14-bit resolution at 128 kSPS. Its on-chip sample-hold amplifier supports 1.5 µs input settling time and 150 ps aperture jitter, enabling accurate digitization of fast-slewing signals up to 500 kHz full-linear bandwidth.
It operates from +5 V digital (VDD) and ±12 V analog (VCC/VEE) supplies, dissipating 560 mW typical. The device uses Analog Devices' BiMOS process-combining low-noise bipolar circuits with CMOS logic-and laser-trimmed thin-film resistors for high DC accuracy without external calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit-guarantees monotonic output with no missing codes over full temperature range. |
| Sampling Rate | 128 kSPS-enables real-time capture of signals up to 500 kHz linear bandwidth without aliasing degradation. |
| S/N+D Ratio | 80 dB (K-grade, –0.5 dB input)-supports high-fidelity signal reconstruction in dynamic measurement applications. |
| Input Range | ±5 V bipolar or 0–10 V unipolar-configurable via BIPOFF pin; straight binary or twos-complement coding selected accordingly. |
| Input Impedance | 10 MΩ-permits direct connection to high-impedance sensors or multiplexer outputs without loading or signal loss. |
| Reference | Onboard 5 V reference (±0.04% FSR drift, K-grade)-eliminates need for external reference unless improved gain stability is required. |
| Power Supplies | +5 V (VDD), +12 V (VCC), –12 V (VEE)-separate analog/digital rails minimize noise coupling; 560 mW typical dissipation. |
Pinout & Package
AD779KNZ is supplied in a 28-pin plastic DIP (N-28) package with 0.6-inch width and standard through-hole mounting. Pin layout isolates analog (AGND, AIN, REFIN, REFOUT, BIPOFF, VCC, VEE) and digital (DGND, CS, OE, EOC, EOCEN, SC, DB13–DB0, VDD) sections to reduce crosstalk.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Digital Power Supply | +5 V supply for logic core; decoupling required within 1 cm to suppress digital switching noise. |
| VEE (Pin 5) | Analog Negative Supply | –12 V rail for analog section; must be well-regulated and filtered to avoid PSR-induced gain errors. |
| AIN (Pin 6) | Analog Input | High-impedance (10 MΩ) node accepting ±5 V or 0–10 V; requires guard ring and short trace routing. |
| AGND (Pin 7) | Analog Ground Return | Exclusive ground return path for AIN only; must be isolated from DGND except at single-point star connection. |
| REFOUT (Pin 8) | Internal Reference Output | +5 V reference source; tied to REFIN for normal operation; drives external trim networks in bipolar/unipolar modes. |
| REFIN (Pin 9) | Reference Input | Accepts internal REFOUT or external reference (e.g., AD586); scales input by 2× to set 10 V full-scale range. |
| BIPOFF (Pin 10) | Bipolar Mode Control | Connect to AGND for unipolar mode (straight binary); connect to REFOUT for bipolar mode (twos-complement). |
| VCC (Pin 11) | Analog Positive Supply | +12 V rail for analog front-end; shares decoupling network with VEE to maintain common-mode rejection. |
| CS (Pin 12) | Chip Select | Active-low enable for data bus; must be asserted ≥tOE before OE to prevent bus contention during read cycles. |
| EOCEN (Pin 13) | EOC Enable | Active-low gate for EOC output; disables EOC when high to allow shared interrupt lines in multi-converter systems. |
| DGND (Pin 14) | Digital Ground Return | Return path for DB13–DB0 and EOC; routed separately from AGND to avoid digital current injection into analog ground. |
| DB0–DB13 (Pins 15–28) | Data Outputs | 14-bit parallel three-state outputs; driven simultaneously in one cycle; require 100 ns access time compliance with 16-bit buses. |
| SC (Pin 4) | Start Convert | Active-low asynchronous trigger; initiates conversion independent of CS state; must not be held low continuously. |
| EOC (Pin 2) | End-of-Convert Flag | Three-state status output; goes low at SC assertion and high upon conversion completion; used for polling or interrupt-driven reads. |
| OE (Pin 3) | Output Enable | Active-low control for DB13–DB0; enables data latching only after EOC goes high; timing-critical for bus setup/hold. |
Key Features
| Feature | Design Value |
|---|---|
| Complete Integration | On-chip SHA, ADC, 5 V reference, clock, and 16-bit interface eliminate >12 external components versus discrete designs. |
| Factory-Trimmable Accuracy | Offset and gain errors adjustable via external 50 Ω resistors-supports <±0.07% FSR zero/gain error after trim in K-grade. |
| AC/DC Dual Characterization | K-grade fully specified for both S/N+D (80 dB), THD (–90 dB), and DC parameters (INL ±1 LSB, gain error 0.09% FSR). |
| Robust Layout Support | Adjacent analog pin grouping (VCC, VEE, AIN, AGND, REFIN, REFOUT, BIPOFF) minimizes routing complexity and improves noise immunity. |
| MIL-STD-883 Compliance | Available in screened versions meeting military reliability standards-validated for extended temperature and shock/vibration environments. |
Applications
| Test & Measurement Equipment | Industrial Process Control |
|---|---|
Use Scenario: High-accuracy voltage logging in benchtop multimeters and automated test systems requiring 14-bit resolution and <0.1% gain drift over 0°C to +70°C. IC Role / Device Role / Timing Role: Primary sampling ADC handling 0–10 V sensor outputs; synchronized to system clock via SC/EOC handshake. Use Value: Factory-trimmed INL (±1 LSB) and onboard 5 V reference eliminate field calibration, reducing test setup time by >40%. | Use Scenario: Analog input module in PLC backplanes digitizing 4–20 mA loop signals conditioned to ±5 V range across multiple channels. IC Role / Device Role / Timing Role: Channel-sampled ADC interfaced to 80186 DMA controller; EOC triggers autonomous data transfer to FIFO buffer. Use Value: 10 MΩ input impedance prevents loading of precision op-amp buffers driving multiplexed inputs, maintaining channel-to-channel isolation >90 dB. |
| Avionics Data Acquisition | Medical Instrumentation |
Use Scenario: Flight data recorder subsystem capturing accelerometer and pressure transducer outputs under MIL-STD-883 environmental stress. IC Role / Device Role / Timing Role: Ruggedized ADC operating from ±12 V supplies; BIPOFF configured for bipolar mode to handle bidirectional sensor excursions. Use Value: Full AC/DC specification across –55°C to +125°C (T-grade) ensures deterministic performance during thermal cycling and vibration testing. | Use Scenario: Patient monitoring device digitizing ECG and EEG signals with minimal added noise in battery-powered portable units. IC Role / Device Role / Timing Role: Low-jitter (150 ps) ADC sampling at 128 kSPS to preserve waveform fidelity; powered from isolated ±12 V/5 V rails to meet IEC 60601 creepage requirements. Use Value: 80 dB S/N+D ratio at –0.5 dB input enables detection of microvolt-level bio-potentials without additional amplification stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-accuracy sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7865BSZ | 4-channel, 14-bit, 100 kSPS SAR ADC; no internal reference; requires external REF and clock; lower power (200 mW). | Optimized for multi-channel simultaneous sampling; lacks integrated SHA and reference; needs external support circuitry. | Select when channel density >1 is required and system-level reference/clock management is already present. |
| ADS8505IPFB | 16-bit, 250 kSPS SAR ADC; ±5 V input range only; external reference required; 3.3 V/5 V digital interface. | Higher resolution but no bipolar/unipolar mode flexibility; no internal reference or clock; incompatible supply voltages (no ±12 V). | Select when 16-bit resolution is mandatory and system design accommodates external ±5 V reference and 3.3 V logic interface. |
Compared with AD779KNZ, AD7865BSZ offers multi-channel integration at lower speed and power but demands external timing and reference; ADS8505IPFB provides higher resolution and speed but sacrifices self-contained operation and bipolar range support, requiring redesign of power and reference subsystems.
Availability
AD779KNZ is available at Aetrix Electronics and suitable for test & measurement equipment, industrial process control systems, avionics data acquisition, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD779KNZ 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 Wilmington, MA.
The AD779 series was designed as a monolithic, self-contained sampling ADC targeting precision data acquisition where integration, AC/DC characterization, and ease of microprocessor interfacing are critical-especially in aerospace, industrial, and medical instrumentation.
FAQ
What is the maximum sampling rate supported by the AD779KNZ?
The AD779KNZ supports a maximum sampling rate of 128 kSPS, corresponding to a minimum conversion time of 7.8 µs. This rate is achievable across its full operating temperature range (0°C to +70°C) and maintains specified AC performance including 80 dB S/N+D ratio and 500 kHz full-linear bandwidth. The device uses asynchronous control (SC/EOC) to synchronize with host processors without requiring strict clock alignment.
Does the AD779KNZ require external calibration to meet datasheet specifications?
No, the AD779KNZ does not require external calibration to meet its K-grade specifications. It is factory trimmed for offset, gain, and linearity errors, delivering ±1 LSB INL, 0.09% FSR gain error, and 80 dB S/N+D ratio out-of-box. External 50 Ω resistors enable optional fine-tuning for applications demanding tighter tolerances, but rated performance is guaranteed without user adjustment.
Can the AD779KNZ operate with a single +5 V supply?
No, the AD779KNZ cannot operate with a single +5 V supply. It 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. Attempting operation outside this supply configuration-such as using ±15 V or omitting VEE-violates absolute maximum ratings and will cause functional failure or permanent damage.
How is bipolar versus unipolar mode selected on the AD779KNZ?
Bipolar versus unipolar mode on the AD779KNZ is selected via the BIPOFF pin (Pin 10). Connect BIPOFF to AGND for unipolar mode (0–10 V input, straight binary output); connect BIPOFF to REFOUT for bipolar mode (±5 V input, twos-complement output). This hardware-selectable configuration determines both input range scaling and data coding format, with no register programming required.
What is the purpose of the EOCEN pin on the AD779KNZ?
The EOCEN (End-of-Convert Enable) pin on the AD779KNZ is an active-low digital input that gates the EOC (End-of-Convert) output. When EOCEN is high, EOC is placed in high-impedance state, allowing multiple AD779KNZ devices to share a common interrupt line without contention. When EOCEN is low, EOC functions normally-going low at conversion start and high upon completion-to support polling or interrupt-driven data reads.
AD779KNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
- 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:
- -
AD779KNZ FAQ
1.How can I place an order for AD779KNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD779KNZ 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 AD779KNZ reliable?
The price and inventory of AD779KNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD779KNZ is usually 5 days.
3.What payment methods are accepted for AD779KNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD779KNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD779KNZ?
AD779KNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD779KNZ 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 AD779KNZ?
For technical support, including AD779KNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD779KNZ requirements.
6.How does Aetrix verify that AD779KNZ is sourced from the original manufacturer or authorized distributors?
All AD779KNZ 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 AD779KNZ meets industry standards.
7.What is the process for return or replacement of AD779KNZ?
All AD779KNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD779KNZ, 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 AD779KNZ part is unused and in its original packaging.
Return procedure for AD779KNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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