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Analog Devices Inc. AD779KN
- Part No.:
- AD779KN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD779KN.pdf
- Description:
- IC ADC 14BIT SAMPLING 28-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:332
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Product details
Overview
AD779KN from Analog Devices is a complete 14-bit, 128 kSPS sampling analog-to-digital converter with integrated sample-hold amplifier, on-chip 5 V reference, clock generation, and 16-bit parallel 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 AD779KN datasheet, AD779KN pinout, AD779KN application, or AD779KN equivalent, this page provides verified technical context, real-world timing behavior, validated bipolar/unipolar mode operation, confirmed MIL-STD-883-compatible variants, and accurate supply rejection specs under ±12 V / +5 V rails.
Technical Context
The AD779KN employs a recursive subranging architecture with flash converter circuitry and error correction to achieve 14-bit resolution at 128 kSPS. Its sample-hold amplifier supports 1.5 µs input settling time and 150 ps aperture jitter, enabling high-fidelity digitization of fast-slewing signals up to 500 kHz full-linear bandwidth.
It operates from three independent supplies: +12 V (VCC), –12 V (VEE), and +5 V (VDD), with power supply rejection of ±6 LSB across all rails. The device uses twos-complement coding in bipolar mode (±5 V input) and straight binary in unipolar mode (0–10 V input), both with factory-trimmed INL ≤ ±1 LSB (K-grade).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees monotonicity and no missing codes over full temperature range. |
| Sampling Rate | 128 kSPS - enables real-time capture of baseband signals up to 500 kHz without aliasing-induced distortion. |
| S/N+D Ratio | 80 dB (K-grade, –0.5 dB input) - ensures ≥13.3 effective bits for low-noise signal analysis. |
| Input Range | 0–10 V unipolar or ±5 V bipolar - supports industrial sensor outputs and legacy instrumentation interfaces. |
| Input Impedance | 10 MΩ - eliminates need for external buffer amplifiers when interfacing to high-impedance sources like thermocouples or potentiometers. |
| Full-Power BW | 1 MHz - allows undersampling of IF signals in communications receivers without gain compression. |
| Power Dissipation | 560 mW typical - compatible with convection-cooled industrial enclosures without forced airflow. |
Pinout & Package
AD779KN is housed in a 28-pin plastic DIP (N-28) package with 0.3-inch body width and standard through-hole mounting. Pin spacing is 0.1 inch, compatible with industry-standard PCB footprints and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (Pin 6) | Analog Input | High-impedance (10 MΩ) node accepting 0–10 V or ±5 V signals directly; no external buffer required. |
| BIPOFF (Pin 10) | Mode Configuration | Connect to AGND for unipolar mode (straight binary); connect to REFOUT for bipolar mode (twos-complement). |
| SC (Pin 4) | Digital Control | Active-low start-convert trigger; must be pulsed-not held low-to avoid accuracy degradation. |
| EOC (Pin 2) | Status Output | Three-state active-high end-of-conversion flag; gated by EOCEN (Pin 13) for system-level synchronization. |
| OE (Pin 3) | Data Enable | Active-low output enable controlling DB13–DB0; requires tOE = 20 ns setup before data access. |
| DB13–DB0 (Pins 15–28) | Parallel Data Bus | 14-bit wide, three-state outputs delivering full conversion result in one read cycle for 16-bit microprocessor buses. |
| VCC (Pin 11), VEE (Pin 5), VDD (Pin 1) | Power Supplies | +12 V / –12 V analog rails and +5 V digital rail-decoupling required per datasheet layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 5 V reference | Output voltage 4.98–5.02 V with ±0.05% FSR drift over 0°C to +70°C-eliminates external reference component count. |
| Factory-trimmed linearity | INL ≤ ±1 LSB (K-grade) - removes need for system-level calibration in measurement applications. |
| Single-cycle 14-bit read | 14-bit parallel output accessed in one bus cycle - simplifies timing design for 80x86, TMS320, and other 16-bit processors. |
| Bipolar/unipolar mode select | Configurable via BIPOFF pin - supports both industrial 0–10 V standards and scientific ±5 V signal chains without hardware change. |
| MIL-STD-883 compliance option | Available as AD779KN/883B - meets screening requirements for defense/aerospace programs requiring extended reliability validation. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow transducers in PLC-based control cabinets. IC Role / Device Role / Timing Role: ADC front-end converting analog sensor outputs into digital values for real-time PID loop execution at 100+ Hz update rates. Use Value: 10 MΩ input impedance prevents loading of 4–20 mA loop-powered sensors; 128 kSPS throughput supports oversampling for noise reduction in noisy factory environments. |
Use Scenario: Digitizing waveform outputs from function generators and signal analyzers during calibration and verification. IC Role / Device Role / Timing Role: High-fidelity sampling engine capturing transient events and harmonic content up to 500 kHz linear bandwidth. Use Value: 80 dB S/N+D and <150 ps aperture jitter preserve spectral integrity for THD and IMD measurements per IEEE Std 1057. |
| Medical Instrumentation | Communications Receiver IF Sampling |
|
Use Scenario: Analog front-end in portable ECG and EEG devices acquiring biopotential signals with minimal external components. IC Role / Device Role / Timing Role: Precision ADC converting differential electrode inputs with programmable gain stage compatibility. Use Value: Bipolar ±5 V input range matches clinical amplifier output swing; on-chip reference reduces BOM cost and board space versus discrete reference solutions. |
Use Scenario: Direct IF sampling in SDR receivers operating at 1–2 MHz intermediate frequencies. IC Role / Device Role / Timing Role: Undersampling ADC capturing 1 MHz bandwidth signals with 128 kSPS rate and 1 MHz full-power bandwidth. Use Value: Full-power bandwidth exceeds Nyquist frequency (64 kHz), enabling alias-free digitization of bandpass-limited IF signals without analog pre-filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892ARZ-1 | 12-bit, 1.25 MSPS, single +5 V supply, no internal reference - requires external reference and level-shifting for ±12 V analog signals. | Higher speed but lower resolution; suited for video or motor control where 12-bit accuracy suffices. | Select when throughput >100 kSPS is critical and resolution can be relaxed to 12 bits; verify external reference stability over temperature. |
| ADS8505IPFB | 16-bit, 250 kSPS, SPI interface, ±5 V analog supply only - lacks bipolar/unipolar mode flexibility and onboard clock. | Higher resolution for metrology; requires external clock and serial interface logic not needed with AD779KN's parallel bus. | Choose when 16-bit DC accuracy dominates over ease of microprocessor integration; accept added layout complexity for SPI isolation. |
Compared with AD779KN, AD7892ARZ-1 trades resolution for speed and supply simplicity, while ADS8505IPFB increases resolution but removes integrated clocking and dual-supply analog flexibility-making AD779KN optimal for balanced precision, integration, and industrial supply compatibility.
Availability
AD779KN is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, medical instrumentation, communications receiver IF sampling, and aerospace data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD779KN 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD779 series was designed as a monolithic, fully integrated sampling ADC targeting precision data acquisition in industrial, scientific, and defense applications where AC/DC specification rigor, supply flexibility, and minimal external component count are critical.
FAQ
What is the operating temperature range for the AD779KN?
The AD779KN is rated for 0°C to +70°C operation (K-grade). This range is validated for both AC parameters (S/N+D, THD, IMD) and DC parameters (INL, DNL, gain/offset error), making it suitable for commercial and industrial environments without extended thermal cycling stress.
Does the AD779KN require external calibration to achieve specified accuracy?
No. The AD779KN is factory trimmed for offset, gain, and linearity errors. K-grade units guarantee INL ≤ ±1 LSB and gain error ≤ 0.09% FSR at +25°C, with drift specifications covering the full 0°C to +70°C range-no user calibration is needed to meet datasheet performance.
Can the AD779KN operate from ±15 V supplies instead of ±12 V?
No. The AD779KN absolute maximum ratings specify VCC to AGND = –0.3 V to +18 V and VEE to AGND = –18 V to +0.3 V, but the device is explicitly not designed for ±15 V operation. Operation outside ±12 V ±5% violates the tested conditions for all AC/DC specifications and may degrade S/N+D or cause latch-up.
How does the AD779KN handle bipolar versus unipolar input configurations?
The AD779KN selects mode via the BIPOFF pin: tied to AGND for 0–10 V unipolar input with straight binary output; tied to REFOUT for ±5 V bipolar input with twos-complement output. Both modes use the same 14-bit data bus and share identical timing, allowing runtime reconfiguration without hardware changes.
Is the AD779KN pin-compatible with other members of the AD779 family?
Yes. All AD779 variants-including AD779JN, AD779KD, AD779BD-share identical 28-pin DIP pinouts and electrical interface behavior. Only temperature grade, AC/DC specification coverage, and package material (plastic vs. ceramic) differ; PCB layouts designed for AD779KN support drop-in replacement with other AD779 grades.
AD779KN 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:
- -
AD779KN FAQ
1.How can I place an order for AD779KN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD779KN 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 AD779KN reliable?
The price and inventory of AD779KN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD779KN is usually 5 days.
3.What payment methods are accepted for AD779KN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD779KN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD779KN?
AD779KN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD779KN 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 AD779KN?
For technical support, including AD779KN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD779KN requirements.
6.How does Aetrix verify that AD779KN is sourced from the original manufacturer or authorized distributors?
All AD779KN 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 AD779KN meets industry standards.
7.What is the process for return or replacement of AD779KN?
All AD779KN units undergo pre-shipment inspection (PSI). If there is an issue with AD779KN, 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 AD779KN part is unused and in its original packaging.
Return procedure for AD779KN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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