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Analog Devices Inc. AD779KD
- Part No.:
- AD779KD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD779KD.pdf
- Description:
- IC ADC 14BIT 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,967
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Product details
Overview
AD779KD from Analog Devices is a 14-bit, 128 kSPS monolithic sampling ADC with integrated SHA, voltage reference, clock generator, and 16-bit bus interface. It delivers 80 dB S/N+D (K-grade), 1 MHz full-power bandwidth, 10 MΩ input impedance, and ±5 V/0–10 V configurable input range in a 28-pin ceramic DIP package. It serves precision data acquisition in industrial instrumentation and automated test equipment.
For engineers reviewing the AD779KD datasheet, AD779KD pinout, AD779KD application, or AD779KD equivalent, this page provides verified specifications, validated pin functions, confirmed ceramic DIP package mapping, real-world timing behavior (7.8 µs conversion time), and two rigorously cross-checked alternative parts for measurement-grade ADC selection.
Technical Context
The AD779KD employs a recursive subranging architecture with flash converter circuitry and on-chip 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 accurate digitization of fast-slewing 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 integrates a laser-trimmed 5.00 V reference (±0.2% output tolerance), supports both unipolar (straight binary) and bipolar (two's complement) coding, and features three-state digital outputs controlled by CS, OE, and EOCEN.
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 audio-band and control-loop signals without external oversampling. |
| S/N+D Ratio | 80 dB (K-grade, –0.5 dB input) - ensures ≥13.0 effective bits for high-fidelity signal reconstruction. |
| Input Range | ±5 V bipolar or 0–10 V unipolar - matches standard industrial sensor outputs and PLC analog I/O levels. |
| Full-Power Bandwidth | 1 MHz - allows undersampling of IF signals up to Nyquist frequency (64 kHz) with minimal amplitude loss. |
| Input Impedance | 10 MΩ - eliminates need for external buffer when interfacing directly to potentiometers or high-Z sensors. |
| Reference Output | 4.98–5.02 V - stable internal reference reduces BOM count and improves gain accuracy vs. external references. |
Pinout & Package
AD779KD is housed in a 28-pin ceramic dual-in-line package (D-28), rated for 0°C to +70°C operation and MIL-STD-883 compliance options. Pin layout isolates analog (AGND, AIN, REFIN, REFOUT, BIPOFF, VCC, VEE) and digital (DGND, DB13–DB0, CS, OE, EOC, EOCEN, SC, VDD) sections to minimize coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (Pin 6) | Analog Input | High-impedance (10 MΩ) node accepting ±5 V or 0–10 V signals; direct connection to unbuffered sources avoids signal degradation. |
| BIPOFF (Pin 10) | Mode Configuration | Selects bipolar (tied to REFOUT) or unipolar (tied to AGND) operation; determines output coding format and input range scaling. |
| REFIN (Pin 9) | Reference Input | Accepts +5 V external reference; internally scaled ×2 to set 10 V full-scale range - enables precision gain calibration. |
| REFOUT (Pin 8) | Internal Reference Output | Provides 4.98–5.02 V ±0.2% reference; used for BIPOFF biasing and external decoupling (10 µF tantalum recommended). |
| SC (Pin 4) | Start Convert | Active-low asynchronous trigger; initiates conversion independent of CS state - supports burst-mode acquisition. |
| EOC (Pin 2) | End-of-Convert Status | Three-state output goes HIGH when conversion completes; gated by EOCEN to synchronize with system timing. |
| OE (Pin 3) | Output Enable | Active-low control for DB13–DB0; enables 14-bit parallel read in single cycle - compatible with 16-bit microprocessor buses. |
| CS (Pin 12) | Chip Select | Active-low enable for digital interface; must be asserted tOE before OE to prevent bus contention. |
Key Features
| Feature | Design Value |
|---|---|
| Complete integration | On-chip SHA, 5 V reference, clock generator, and 16-bit bus interface eliminate 12+ external components in discrete designs. |
| Factory-trimmed accuracy | ±1 LSB INL and ±0.09% FSR gain error (K-grade) achieved without user calibration - reduces production test time. |
| Low-noise analog front-end | 150 ps aperture jitter and 80 dB S/N+D enable <14-bit ENOB performance in 0–50 kHz measurement bands. |
| Robust power supply rejection | ±6 LSB full-scale shift over ±5% VCC/VEE and ±10% VDD variation - maintains accuracy in noisy industrial power environments. |
| MIL-STD-883 qualified variants | Ceramic DIP packaging and screening per MIL-STD-883B - supports aerospace and defense applications requiring extended reliability. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous logging of pressure, temperature, and flow sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary sampling ADC acquiring synchronized multi-channel analog inputs at 100 kSPS with deterministic 7.8 µs conversion latency. Use Value: 10 MΩ input impedance eliminates buffering for 4–20 mA loop receivers; ±5 V range matches standard industrial transducer outputs. |
Use Scenario: Digitizing stimulus-response waveforms during functional testing of op-amps and filters. IC Role / Device Role / Timing Role: High-fidelity acquisition engine capturing transient responses with 1 MHz full-power bandwidth and low aperture jitter. Use Value: 80 dB S/N+D ensures >13-bit effective resolution for THD and IMD measurements; straight binary/unipolar mode simplifies post-processing. |
| Medical Instrumentation | Power Quality Analyzers |
|
Use Scenario: ECG and EEG signal conditioning in portable diagnostic devices requiring low power and high linearity. IC Role / Device Role / Timing Role: Precision front-end ADC converting amplified biopotential signals with minimal added noise or distortion. Use Value: Bipolar two's complement output directly supports differential signal processing; 500 kHz full-linear bandwidth preserves QRS complex fidelity. |
Use Scenario: Simultaneous voltage/current sampling for harmonic analysis in grid-tied inverters and smart meters. IC Role / Device Role / Timing Role: Synchronized dual-channel sampling node (with companion AD779x) capturing 50/60 Hz fundamentals and 50th-order harmonics. Use Value: 128 kSPS rate satisfies >2.5× oversampling for Class A power analyzers; internal reference ensures gain stability across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-accuracy ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7792BRUZ | 24-bit Σ-Δ architecture, 120 SPS max, built-in PGA, no internal reference - requires external 2.5 V reference. | Better DC precision (0.0015% INL), but 1000× slower sampling - suited for weigh scales, not dynamic signal capture. | Select AD7792BRUZ only when ultra-high resolution at low speed is required; AD779KD remains optimal for 100+ kSPS measurement systems. |
| ADS8588SIPM | SAR architecture, 1 MSPS, 16-bit, ±5 V input, external reference only, 3.3 V digital interface - no internal clock or reference. | Higher speed and resolution, but demands full external support circuitry (reference, clock, level-shifting) - increases layout complexity. | Choose ADS8588SIPM for bandwidth-critical applications needing >500 kSPS; AD779KD offers lower system-level BOM and design effort for 128 kSPS use cases. |
Compared with AD7792BRUZ and ADS8588SIPM, the AD779KD uniquely balances 14-bit resolution, 128 kSPS throughput, and full integration - reducing PCB area, component count, and qualification effort while maintaining verified performance across industrial temperature ranges.
Availability
AD779KD is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical instrumentation, and power quality analyzers requiring stable component supply, long-term lifecycle support, and MIL-qualified ceramic packaging.
Supply support for AD779KD 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 AD779x family was designed specifically for precision data acquisition in harsh industrial and instrumentation environments, emphasizing integrated functionality, factory-trimmed DC accuracy, and robust AC performance without external calibration.
FAQ
What is the operating temperature range for the AD779KD?
The AD779KD is specified for 0°C to +70°C operation (K-grade), with full AC and DC parameter characterization across this range. Its ceramic DIP package provides superior thermal stability versus plastic alternatives, and MIL-STD-883 compliant versions are available for extended reliability validation. The AD779KD maintains ±1 LSB INL and 80 dB S/N+D within this envelope.
Does the AD779KD require external calibration to achieve datasheet accuracy?
No - the AD779KD is factory trimmed for offset, gain, and linearity errors, delivering ±1 LSB INL and ±0.09% FSR gain error without user calibration. External trims (via R1/R2 in Figures 5–6) are optional and only needed when tighter than datasheet limits are required. The AD779KD achieves rated performance out-of-box with proper decoupling and grounding.
Can the AD779KD interface directly with a 3.3 V microcontroller bus?
No - the AD779KD digital interface operates at +5 V logic levels (VDD = +5 V), with VIH minimum of 2.0 V and VOH of 4.0 V at 0.1 mA. Direct connection to 3.3 V buses risks violating input voltage limits and may cause latch-up. Level-shifting circuitry or a 5 V-tolerant microcontroller interface is required for safe operation with the AD779KD.
What is the purpose of the BIPOFF pin on the AD779KD?
The BIPOFF pin (Pin 10) configures the AD779KD's input range and output coding format: tying it to AGND selects 0–10 V unipolar input with straight binary output; tying it to REFOUT selects ±5 V bipolar input with two's complement output. This single pin determines both analog front-end scaling and digital data interpretation - a key design flexibility feature of the AD779KD.
How does the AD779KD handle power supply noise, and what decoupling is recommended?
The AD779KD exhibits ±6 LSB full-scale shift over ±5% VCC/VEE and ±10% VDD variation, demonstrating strong inherent PSRR. For optimal performance, Analog Devices specifies 10 µF tantalum + 0.1 µF ceramic capacitors placed adjacent to each supply pin (VDD, VCC, VEE), with short traces to ground. REFIN requires an additional 10 µF tantalum to improve S/N+D ratio by filtering reference noise - all critical for achieving the AD779KD's 80 dB specification.
AD779KD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm)
- Packaging:
- Bulk
- 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-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD779KD FAQ
1.How can I place an order for AD779KD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD779KD 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 AD779KD reliable?
The price and inventory of AD779KD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD779KD is usually 5 days.
3.What payment methods are accepted for AD779KD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD779KD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD779KD?
AD779KD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD779KD 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 AD779KD?
For technical support, including AD779KD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD779KD requirements.
6.How does Aetrix verify that AD779KD is sourced from the original manufacturer or authorized distributors?
All AD779KD 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 AD779KD meets industry standards.
7.What is the process for return or replacement of AD779KD?
All AD779KD units undergo pre-shipment inspection (PSI). If there is an issue with AD779KD, 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 AD779KD part is unused and in its original packaging.
Return procedure for AD779KD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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