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Analog Devices Inc. AD779JD
- Part No.:
- AD779JD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD779JD.pdf
- Description:
- IC ADC 14BIT SAMPLING 28-CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:16,329
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Product details
Overview
AD779JD from Analog Devices is a 14-bit, 128 kSPS monolithic sampling analog-to-digital converter with integrated sample-hold amplifier, on-chip 5 V reference, clock generation, and 16-bit bus interface. It delivers 80 dB S/N+D (typ), 1 MHz full-power bandwidth, and 10 MΩ input impedance, enabling direct connection to unbuffered sensors in precision data acquisition systems for industrial process control.
For engineers reviewing the AD779JD datasheet, AD779JD pinout, AD779JD application, or AD779JD equivalent, key selection considerations include its J-grade AC-only specification (0°C to +70°C), ceramic DIP-28 package, bipolar/unipolar mode support via BIPOFF pin, and factory-trimmed performance eliminating external calibration in most measurement applications.
Technical Context
The AD779JD implements 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 accurate digitization of fast-slewing signals up to 500 kHz full-linear bandwidth.
It operates from three supplies (+5 V digital, ±12 V analog), uses twos-complement coding in bipolar mode (±5 V input) and straight binary in unipolar mode (0–10 V input), and features asynchronous conversion control via SC, EOC, and OE pins for flexible microprocessor interfacing without timing constraints.
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 without aliasing in linear region. |
| S/N+D Ratio | 80 dB (typ) - ensures ≥13.3 effective bits of dynamic resolution for low-noise signal processing. |
| Input Impedance | 10 MΩ - allows direct connection to high-impedance sources (e.g., thermocouples, RTDs) without buffer amplifiers. |
| Full-Power BW | 1 MHz - supports undersampling of IF/RF signals while maintaining amplitude fidelity at full scale. |
| Supply Voltages | +5 V (VDD), +12 V (VCC), –12 V (VEE) - requires triple-rail supply; not compatible with ±15 V rails. |
| Operating Temp | 0°C to +70°C (J grade) - qualified for commercial and industrial environments with AC-only characterization. |
Pinout & Package
AD779JD is housed in a 28-pin ceramic dual-in-line package (D-28), offering superior thermal stability and hermetic sealing versus plastic variants. Pin layout separates analog (VCC, VEE, AGND, AIN, REFIN, REFOUT, BIPOFF) and digital (VDD, DGND, CS, OE, SC, EOC, EOCEN, DB13–DB0) domains to minimize noise coupling.
| 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 switching noise. |
| VEE (Pin 5) | Analog Negative Supply | –12 V rail for analog section; must be regulated to ±5% to limit PSR-induced gain error (±6 LSB). |
| AIN (Pin 6) | Analog Input | High-impedance (10 MΩ) node accepting 0–10 V (unipolar) or ±5 V (bipolar); no external buffer needed. |
| BIPOFF (Pin 10) | Mode Configuration | Connect to AGND for unipolar mode (straight binary); to REFOUT for bipolar mode (twos-complement). |
| CS (Pin 12) | Digital Enable | Active-low chip select; must be asserted tOE before OE to enable valid 14-bit parallel readout. |
| EOCEN (Pin 13) | EOC Gate Control | Active-low enable for EOC output; when high, EOC enters high-impedance state for bus sharing. |
| DB13–DB0 (Pins 15–28) | Data Output Bus | 14-bit parallel output; three-state drivers synchronized to OE falling edge; single-cycle read compatible with 16-bit buses. |
Key Features
| Feature | Design Value |
|---|---|
| Onboard 5 V Reference | ±0.04% FSR drift over 0°C to +70°C; eliminates need for external reference in cost-sensitive designs. |
| Factory-Trimmed INL/DNL | ±2 LSB INL (max), 14-bit DNL guaranteed - removes requirement for system-level calibration hardware or firmware. |
| Asynchronous Conversion Control | SC-triggered start with EOC status flag - enables integration with any microprocessor without fixed timing windows. |
| High Input Bandwidth | 500 kHz full-linear bandwidth - preserves signal integrity for transient capture in motor control feedback loops. |
| MIL-STD-883 Compliant Option | D-28 ceramic package supports screening per MIL-STD-883B - suitable for aerospace and defense programs requiring extended reliability validation. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous voltage/current monitoring of PLC I/O modules in chemical plant control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing 4–20 mA loop signals conditioned by precision op-amps; samples at 100 kSPS with deterministic latency. Use Value: 10 MΩ input impedance avoids loading of current-sense resistors; 80 dB S/N+D ensures <0.01% measurement uncertainty in 16-bit data streams. | Use Scenario: Digitizing sensor outputs in portable multimeters and automated test equipment (ATE) mainframes. IC Role / Device Role / Timing Role: High-fidelity front-end ADC for DC/AC voltage, resistance, and temperature measurements; configured in unipolar mode for 0–10 V ranges. Use Value: Factory-trimmed zero/gain errors reduce calibration labor; ceramic DIP package withstands reflow and mechanical stress during field repair cycles. |
| Motor Drive Feedback Systems | Medical Instrumentation |
Use Scenario: Sampling phase currents and DC bus voltage in servo drive inverters for closed-loop torque/speed control. IC Role / Device Role / Timing Role: Real-time ADC feeding DSP with synchronized current samples; uses bipolar mode for ±5 V isolated current shunt outputs. Use Value: 1.5 µs input settling time enables accurate capture of fast-switching PWM edges; 1 MHz full-power BW supports harmonic analysis up to 5th order. | Use Scenario: Analog front-end for patient-worn ECG/EMG monitors requiring low-power, high-accuracy biopotential digitization. IC Role / Device Role / Timing Role: Precision ADC converting amplified electrode signals; operated in unipolar mode with external low-noise reference for enhanced DC stability. Use Value: Low 150 ps aperture jitter minimizes noise folding in baseband biopotential spectra; ceramic package ensures long-term parameter stability in clinical environments. |
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 |
|---|---|---|---|
| AD779KN | Same die, plastic DIP-28 package; DC specs fully characterized (±1 LSB INL vs ±2 for AD779JD); identical AC performance. | Lower cost for non-hermetic, non-military applications; reduced thermal cycling reliability vs ceramic. | Select AD779KN when budget constraints outweigh need for hermetic sealing or extended temperature margin. |
| AD7892BR | 12-bit, 1 MSPS SAR ADC; no internal reference; requires external 5 V ref; 70 dB S/N+D; 100 ns conversion time. | Higher speed but lower resolution; lacks integrated SHA and reference; needs external support circuitry. | Choose AD779JD over AD7892BR when 14-bit resolution, integrated reference, and sample-hold capability are mandatory for system simplification. |
Compared with AD779KN, AD779JD offers superior thermal stability and hermetic protection in ceramic packaging but with identical AC specifications and J-grade temperature range; versus AD7892BR, AD779JD provides 2 extra bits of resolution and full integration at the cost of lower maximum throughput rate.
Availability
AD779JD is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, motor drive feedback systems, and medical instrumentation requiring stable component supply across extended product lifecycles.
Supply support for AD779JD 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 AD779JD belongs to Analog Devices' legacy high-speed sampling ADC product line, designed specifically for precision data acquisition in industrial automation, instrumentation, and embedded control systems where integration, accuracy, and reliability are critical.
FAQ
What is the operating temperature range for the AD779JD?
The AD779JD is rated for operation from 0°C to +70°C (J grade). This range is validated for AC parameters only-DC specifications such as INL, gain error, and offset are provided as typical values, not guaranteed limits, across this temperature span. The ceramic DIP package contributes to stable thermal performance within this envelope.
Does the AD779JD require external calibration components?
The AD779JD is factory trimmed for offset, gain, and linearity, so external calibration components are not required for basic operation. In unipolar mode, only a 50 Ω ±1% resistor is needed; in bipolar mode, two such resistors support optional fine trimming. For applications demanding tighter DC accuracy, external trims can adjust zero error within ±40 LSB and gain error within ±80 LSB.
Can the AD779JD operate from ±15 V supplies?
No, the AD779JD is not designed to operate from ±15 V supplies. Absolute maximum ratings specify VCC to AGND ≤ +18 V and VEE to AGND ≥ –18 V, but the device is characterized and specified only for ±12 V analog supplies (VCC = +12 V ±5%, VEE = –12 V ±5%). Operation outside these conditions may cause parametric degradation or functional failure.
What is the purpose of the BIPOFF pin on the AD779JD?
The BIPOFF pin on the AD779JD configures input range and data coding format: tying BIPOFF to AGND selects unipolar mode (0–10 V input, straight binary output), while connecting it to REFOUT enables bipolar mode (±5 V input, twos-complement output). This pin directly controls the internal reference scaling and digital output mapping-no register programming is involved.
How does the AD779JD handle power-up initialization?
The AD779JD requires approximately 10 µs after all supplies (VDD, VCC, VEE) reach regulation for internal logic reset to complete. During this period, SC, CS, and OE should remain inactive (high), and no conversion commands should be issued. After power-up stabilization, the device is ready for normal operation-including immediate SC assertion to initiate the first conversion.
AD779JD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-CDIP (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-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD779JD FAQ
1.How can I place an order for AD779JD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD779JD 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 AD779JD reliable?
The price and inventory of AD779JD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD779JD is usually 5 days.
3.What payment methods are accepted for AD779JD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD779JD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD779JD?
AD779JD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD779JD 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 AD779JD?
For technical support, including AD779JD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD779JD requirements.
6.How does Aetrix verify that AD779JD is sourced from the original manufacturer or authorized distributors?
All AD779JD 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 AD779JD meets industry standards.
7.What is the process for return or replacement of AD779JD?
All AD779JD units undergo pre-shipment inspection (PSI). If there is an issue with AD779JD, 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 AD779JD part is unused and in its original packaging.
Return procedure for AD779JD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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