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Analog Devices Inc. AD779JDZ
- Part No.:
- AD779JDZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD779JDZ.pdf
- Description:
- IC ADC 14BIT 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,361
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Product details
Overview
AD779JDZ from Analog Devices is a complete 14-bit monolithic sampling ADC with integrated sample-hold amplifier, 5 V reference, clock generator, and 16-bit bus interface. It delivers 128 kSPS throughput, 1 MHz full-power bandwidth, 80 dB S/N+D (typ), 10 MΩ input impedance, and ±5 V or 0–10 V input ranges. It serves in precision data acquisition systems requiring high dynamic range and dc accuracy.
For engineers reviewing the AD779JDZ datasheet, AD779JDZ pinout, AD779JDZ application, or AD779JDZ equivalent, key selection criteria include its dual-mode (unipolar/bipolar) coding, factory-trimmed dc performance, MIL-STD-883-compliant ceramic DIP package, and compatibility with 16-bit microprocessor buses without external timing or calibration circuitry.
Technical Context
The AD779JDZ implements a recursive subranging architecture with flash converter stages 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), and –12 V (VEE) supplies, dissipating 560 mW typical. The device uses Analog Devices' BiMOS process-combining low-noise bipolar circuits for analog front-end precision with low-power CMOS logic for digital interface integrity-and laser-trimmed thin-film resistors for stable gain/offset performance across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit-guarantees monotonic output with no missing codes and 0.61 mV LSB step size at 10 V full scale. |
| Sampling Rate | 128 kSPS-enables real-time capture of audio-band and control-loop signals without undersampling artifacts. |
| S/N+D Ratio | 80 dB (typ, –0.5 dB input)-supports >12.6 ENOB in signal processing applications with minimal noise floor contribution. |
| Full-Power Bandwidth | 1 MHz-allows digitization of full-scale sine waves up to 1 MHz before 3 dB amplitude roll-off. |
| Input Impedance | 10 MΩ-permits direct connection to high-impedance sensors or multiplexer outputs without loading-induced gain error. |
| Reference Output | 5.00 V ±20 mV-on-chip voltage reference eliminates need for external precision reference in cost-sensitive designs. |
| Supply Voltages | +5 V (VDD), +12 V (VCC), –12 V (VEE)-requires three-rail operation; not compatible with ±15 V supplies. |
| Operating Temperature | 0°C to +70°C (J-grade)-validated for commercial industrial environments with specified ac/dc performance. |
Pinout & Package
AD779JDZ is supplied in a 28-pin ceramic dual-in-line package (CERDIP), designated D-28 per Analog Devices' ordering guide. This hermetically sealed package ensures long-term reliability in harsh thermal and humidity environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Digital power supply | +5 V rail powering CMOS logic; decoupling required within 1 cm to suppress switching noise coupling into analog section. |
| VCC (Pin 11) | Analog positive supply | +12 V rail powering sample-hold amplifier and reference; must be regulated to ±5% for rated linearity. |
| VEE (Pin 5) | Analog negative supply | –12 V rail enabling bipolar input operation; shares same regulation tolerance as VCC. |
| AGND (Pin 7) | Analog ground return | Isolated ground node for AIN, REFIN, REFOUT, BIPOFF; must be physically separated from DGND except at single-point star connection. |
| DGND (Pin 14) | Digital ground return | Return path for DB13–DB0, OE, CS, EOCEN; carries high-frequency digital switching currents. |
| AIN (Pin 6) | Analog input | High-impedance (10 MΩ) node accepting 0–10 V unipolar or ±5 V bipolar signals; requires guard ring routing in PCB layout. |
| BIPOFF (Pin 10) | Bipolar mode control | Connect to AGND for unipolar mode (straight binary); connect to REFOUT for bipolar mode (twos complement). |
| REFOUT (Pin 8) | Internal reference output | +5 V reference source; tied to REFIN for normal operation; can be bypassed with 10 µF tantalum capacitor to improve S/N+D. |
| REFIN (Pin 9) | Reference input | Accepts internal 5 V or external reference; scaling factor of ×2 means 5 V input yields 10 V full-scale range. |
| SC (Pin 4) | Start Convert input | Active-low asynchronous trigger; must be pulsed-not held low-to avoid conversion accuracy degradation. |
| EOC (Pin 2) | End-of-Convert output | Three-state status flag indicating conversion completion; gated by EOCEN and enabled only when EOCEN = LOW. |
| OE (Pin 3) | Output Enable input | Active-low control for DB13–DB0; data valid after tOE delay; requires CS asserted prior to OE activation. |
| CS (Pin 12) | Chip Select input | Active-low enable for all digital outputs; must be stable tOE before OE transition to prevent bus contention. |
| DB13–DB0 (Pins 15–28) | Data bus outputs | 14-bit parallel output; straight binary in unipolar mode, twos complement in bipolar mode; three-state drivers support shared bus architectures. |
Key Features
| Feature | Design Value |
|---|---|
| Complete integration | On-chip SHA, reference, clock, and 16-bit bus interface eliminate ≥7 external components versus discrete ADC designs. |
| Factory-trimmed dc accuracy | J-grade guarantees ±2 LSB INL and ±0.12% FSR gain error at +25°C-no user calibration required for basic measurement tasks. |
| Two coding formats | Hardware-selectable unipolar (straight binary) or bipolar (twos complement) output simplifies software handling in mixed-signal controllers. |
| High input impedance | 10 MΩ input resistance enables direct connection to thermocouples, strain gauges, or multiplexed sensor arrays without buffer amplifiers. |
| MIL-STD-883 compliance option | D-28 ceramic package variant available in screened versions meeting military environmental and reliability standards. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA current loop outputs converted to voltage via precision shunt resistor in PLC analog input modules. IC Role / Device Role / Timing Role: Primary sampling ADC performing synchronized 128 kSPS conversions with 10 MΩ input impedance to avoid loading errors on high-Z transducer circuits. Use Value: Eliminates need for external op-amp buffers and reference ICs, reducing BOM count and improving long-term drift stability over temperature. | Use Scenario: Digitizing calibrated sine wave outputs from function generators during automated calibration of spectrum analyzers and oscilloscopes. IC Role / Device Role / Timing Role: High-dynamic-range ADC capturing full-scale 1 MHz test tones with 80 dB S/N+D to validate instrument noise floor and harmonic distortion specs. Use Value: Factory-trimmed dc linearity (±2 LSB INL) and ac performance (–90 dB THD) ensure traceable metrology-grade measurements without post-processing correction. |
| Avionics Sensor Interfaces | Medical Diagnostic Signal Acquisition |
Use Scenario: Converting analog outputs from pressure, temperature, and inertial sensors in flight data recorders operating across –40°C to +70°C ambient. IC Role / Device Role / Timing Role: J-grade ADC delivering guaranteed ac/dc specs over full temperature range, housed in hermetic ceramic DIP for moisture resistance and thermal cycling endurance. Use Value: On-chip 5 V reference and BiMOS process provide stable gain/offset performance without external trimming, reducing qualification testing overhead. | Use Scenario: Sampling ECG, EEG, and EMG bio-potential signals amplified by instrumentation amplifiers in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision ADC acquiring low-amplitude, high-impedance biopotentials with 150 ps aperture jitter and 1.5 µs settling time to preserve waveform fidelity. Use Value: 10 MΩ input impedance prevents signal attenuation from electrode-skin interface impedance, maintaining clinical-grade SNR without active guarding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7792BRUZ | 24-bit sigma-delta ADC; 125 SPS to 24 kSPS; integrated PGA; single +3.3 V supply; no bipolar mode. | Targeted at ultra-high-resolution low-speed sensor readings (e.g., weigh scales), not medium-speed general-purpose sampling. | Select AD7792BRUZ only when resolution >16 bits and sampling rate <24 kSPS are mandatory; AD779JDZ remains superior for 128 kSPS real-time acquisition. |
| ADS8505IPFB | 16-bit SAR ADC; 250 kSPS; ±5 V input; external reference required; 3.3 V/5 V I/O compatible. | Higher speed and resolution but lacks on-chip reference, clock, and bipolar coding-requires more support circuitry. | Choose ADS8505IPFB if system demands >14-bit resolution at >128 kSPS and board space allows external reference/clock; AD779JDZ offers lower integration burden. |
Compared with AD7792BRUZ and ADS8505IPFB, AD779JDZ uniquely balances 14-bit resolution, 128 kSPS throughput, on-chip reference/clock, and hardware-selectable bipolar/unipolar modes in a single-ceramic-DIP package-making it optimal for compact, self-contained data acquisition modules where design cycle time and component count are critical.
Availability
AD779JDZ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, avionics sensor interfaces, and medical diagnostic signal acquisition requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD779JDZ 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 AD779JDZ belongs to Analog Devices' legacy high-speed precision sampling ADC family, designed specifically for applications demanding both ac dynamic performance (S/N+D, THD) and dc accuracy (INL, gain drift) in a single monolithic solution.
FAQ
What is the maximum sampling rate supported by the AD779JDZ?
The AD779JDZ 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 is maintained regardless of input signal amplitude or coding mode (unipolar or bipolar). The AD779JDZ achieves this speed using a recursive subranging architecture with integrated flash converter stages and on-chip error correction.
Does the AD779JDZ require external calibration components for basic operation?
No, the AD779JDZ does not require external calibration components for basic operation. It is factory-trimmed to deliver specified dc accuracy-including ±2 LSB integral nonlinearity and ±0.12% FSR gain error-at +25°C. In unipolar mode, only a single 50 Ω ±1% resistor is needed if fine offset/gain adjustment is required; in bipolar mode, two such resistors are recommended. The AD779JDZ's on-chip 5 V reference and integrated clock further reduce external component count.
Can the AD779JDZ operate from ±15 V power supplies?
No, the AD779JDZ cannot operate from ±15 V power supplies. Its absolute maximum ratings specify VCC ≤ +18 V and VEE ≥ –18 V, but the device is explicitly designed for +12 V (VCC), –12 V (VEE), and +5 V (VDD) operation. The datasheet warns that "The AD779 is not designed to operate from ±15 V supplies." Using ±15 V may cause parametric shift, increased power dissipation, or long-term reliability issues not covered by specification.
What input voltage ranges does the AD779JDZ support, and how are they selected?
The AD779JDZ supports two input voltage ranges: 0 V to +10 V (unipolar) and ±5 V (bipolar). Selection is controlled by the BIPOFF pin (Pin 10): connecting BIPOFF to AGND configures unipolar mode with straight binary output coding; connecting BIPOFF to REFOUT configures bipolar mode with twos complement output coding. Both ranges leverage the same 10 MΩ input impedance and 10 V p-p full-scale capability.
Is the AD779JDZ pin-compatible with other members of the AD779 family?
Yes, the AD779JDZ is pin-compatible with all other AD779 variants in the same package type-including AD779KN, AD779KD, and AD779BD-because they share identical 28-pin DIP footprints (N-28 plastic or D-28 ceramic) and identical pin functions. However, dc specifications differ: J-grade parts like AD779JDZ are ac-characterized only, while K/B/T grades include full dc parameter testing. Functionally identical timing, interface, and analog behavior ensure drop-in replacement within the same grade and package.
AD779JDZ 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:
- -
AD779JDZ FAQ
1.How can I place an order for AD779JDZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD779JDZ 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 AD779JDZ reliable?
The price and inventory of AD779JDZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD779JDZ is usually 5 days.
3.What payment methods are accepted for AD779JDZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD779JDZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD779JDZ?
AD779JDZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD779JDZ 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 AD779JDZ?
For technical support, including AD779JDZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD779JDZ requirements.
6.How does Aetrix verify that AD779JDZ is sourced from the original manufacturer or authorized distributors?
All AD779JDZ 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 AD779JDZ meets industry standards.
7.What is the process for return or replacement of AD779JDZ?
All AD779JDZ units undergo pre-shipment inspection (PSI). If there is an issue with AD779JDZ, 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 AD779JDZ part is unused and in its original packaging.
Return procedure for AD779JDZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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