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Analog Devices Inc. AD678AJ
- Part No.:
- AD678AJ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-CLCC (J-Lead)
- Datasheet:
-
AD678AJ.pdf
- Description:
- IC ADC 12BIT FLASH 44JLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,819
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Product details
Overview
AD678AJ from Analog Devices is a complete 12-bit, 200 kSPS monolithic sampling analog-to-digital converter with integrated sample-hold amplifier, on-chip 5 V reference, clock generation, and dual-mode (8-/12-bit) parallel bus interface. It delivers 71 dB S/N+D (typ), 1 MHz full-power bandwidth, and ±1 LSB INL (typ) across –40°C to +85°C, enabling precision data acquisition in industrial instrumentation and signal processing systems.
For engineers reviewing the AD678AJ datasheet, AD678AJ pinout, AD678AJ application, or AD678AJ equivalent, this page provides verified technical context, validated pin functions for the 44-lead JLCC package, confirmed AC/DC specifications per J-grade testing, and two rigorously cross-referenced alternative parts for unipolar/bipolar measurement systems requiring 200 kSPS throughput and 12-bit resolution.
Technical Context
The AD678AJ employs a recursive subranging architecture combining flash converter stages with error correction logic to achieve 12-bit resolution at 200 kSPS while maintaining 500 kHz full-linear bandwidth. Its sample-hold amplifier features 10 MΩ input impedance and 1 µs settling time, supporting direct connection to high-impedance sources without buffering.
It operates from three independent supplies (+12 V, –12 V, +5 V), integrates a laser-trimmed 4.98–5.02 V reference, and supports configurable digital interfaces: 12-bit parallel output (DB11–DB0) or 8-bit multiplexed output (DB11–DB4 with R/L and HBE control), all TTL/5 V CMOS compatible.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - defines quantization step of 2.44 mV in 10 V unipolar range. |
| Sampling Rate | 200 kSPS - enables real-time capture of signals up to 100 kHz Nyquist frequency. |
| S/N+D Ratio | 71 dB (typ) at –0.5 dB input - ensures >11.8 effective bits for dynamic signal fidelity. |
| Full-Power Bandwidth | 1 MHz - supports accurate digitization of fast transients without amplitude loss. |
| Integral Nonlinearity | ±1 LSB (max) - guarantees monotonicity and absence of missing codes in measurement. |
| Input Range | 0 to +10 V (unipolar) or –5 V to +5 V (bipolar) - matches standard sensor and DAC output levels. |
| Reference Output | 4.98–5.02 V (loaded) - provides stable excitation for external circuits and calibration. |
Pinout & Package
AD678AJ is housed in a 44-lead ceramic J-leaded chip carrier (JLCC) package, pin-compatible with MIL-STD-883 screening variants and optimized for mixed-signal PCB layout with segregated analog/digital pin groups.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN | Analog Input | High-impedance (10 MΩ) node accepting 0–10 V or ±5 V signals directly from sensors or amplifiers. |
| AGND | Analog Ground | Dedicated return path for AIN only; must be isolated from DGND to prevent digital noise coupling. |
| VCC / VEE / VDD | Analog/Digital Supplies | +12 V (VCC), –12 V (VEE), +5 V (VDD); require local 10 µF + 0.1 µF decoupling to AGND. |
| REFOUT / REFIN | Internal Reference I/O | REFOUT = 5 V reference output; REFIN = reference input-tied together via 50 Ω for normal operation. |
| BIPOFF | Bipolar Mode Control | Connect to AGND for unipolar mode (straight binary); to REFOUT via 50 Ω for bipolar mode (twos complement). |
| 12/8 | Interface Format Select | High = 12-bit parallel (DB11–DB0 active); Low = 8-bit multiplexed (DB11–DB4 + R/L/HBE control). |
| SC / CS / OE | Conversion & Bus Control | SC starts conversion; CS enables device; OE enables outputs-TTL/CMOS compatible with defined timing delays. |
| EOC / EOCEN | Conversion Status | EOC goes HIGH when conversion completes; EOCEN enables EOC output (active LOW). |
| DB11–DB0 | Data Outputs | Three-state, 12-bit parallel outputs; in 8-bit mode, DB11–DB4 carry upper/lower byte depending on R/L and HBE. |
| SYNC | Mode Selection | Tied to VDD = synchronous mode (CS-gated SC/EOC); tied to DGND = asynchronous mode (SC independent of CS). |
Key Features
| Feature | Design Value |
|---|---|
| Complete On-Chip Functionality | Integrates SHA, 12-bit ADC, 5 V reference, clock generator, and bus interface-eliminates 12+ external components. |
| Factory Laser Trimming | Delivers ±1 LSB INL and ±4 LSB gain error without user calibration-reduces production test time and cost. |
| Dual-Bus Interface Flexibility | Supports both 16-bit microprocessor buses (single 12-bit read) and 8-bit systems (two 8-bit reads with alignment control). |
| High-Fidelity Dynamic Performance | 71 dB S/N+D and –88 dB THD enable accurate spectral analysis of audio, vibration, and communication signals. |
| Military-Grade Packaging Option | 44-lead JLCC package qualified to MIL-STD-883 screening-suitable for aerospace and defense applications. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous voltage/current monitoring of PLC I/O modules and sensor arrays in factory automation. IC Role / Device Role / Timing Role: Primary sampling ADC capturing 200 kSPS waveforms from strain gauges, RTDs, and current shunts. Use Value: 10 MΩ input impedance eliminates need for buffer op-amps; ±1 LSB INL ensures traceable calibration against NIST standards. |
Use Scenario: Digitizing stimulus-response waveforms during functional testing of mixed-signal ICs and power supplies. IC Role / Device Role / Timing Role: High-speed acquisition front-end synchronized to pattern generator clocks via SYNC and SC inputs. Use Value: 1 MHz full-power bandwidth captures fast transients; 71 dB S/N+D enables accurate FFT-based distortion analysis. |
| Communications Signal Analysis | Avionics Data Acquisition |
Use Scenario: Real-time baseband sampling of IF signals in software-defined radio receivers and spectrum analyzers. IC Role / Device Role / Timing Role: ADC in undersampling architecture-digitizing 49.902 kHz tone with 200 kSPS to validate harmonic distortion. Use Value: –88 dB THD and –85 dB IMD meet MIL-STD-461 radiated emissions requirements for RF subsystems. |
Use Scenario: Engine health monitoring via vibration and temperature sensor fusion in flight control computers. IC Role / Device Role / Timing Role: Radiation-tolerant sampling node operating across –40°C to +85°C with MIL-STD-883-compliant packaging. Use Value: Dual supply operation (+12 V/–12 V) interfaces directly with legacy avionics signal conditioning; 500 kHz linear bandwidth preserves rotor harmonics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD678BD | Same 44-lead JLCC package and –40°C to +85°C range, but fully specified for DC parameters (±0.7 LSB INL, ±3 LSB gain error) vs. AD678AJ's AC-only spec. | Required where offset/gain drift over temperature must be guaranteed (e.g., closed-loop control feedback paths). | Select AD678BD if system-level calibration is impractical and DC accuracy must be assured across full temperature range. |
| AD7892BR | 12-bit, 200 kSPS SAR ADC in 28-lead SOIC; single +5 V supply; no internal reference; requires external REF and clock. | Used in space-constrained, low-power portable instruments where board area and supply count are critical. | Choose AD7892BR only when simplifying power architecture justifies added external component count and reduced dynamic performance (69 dB S/N+D). |
Compared with AD678AJ, AD678BD offers tighter DC specs at identical packaging and temperature grade, while AD7892BR trades integration and dynamic performance for smaller footprint and single-supply operation-making AD678AJ optimal for fixed-platform industrial and defense systems prioritizing signal integrity and minimal BOM.
Availability
AD678AJ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, communications signal analysis, and avionics data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD678AJ 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 AD678AJ belongs to Analog Devices' legacy high-speed precision ADC product line, designed specifically for demanding measurement and signal processing applications where integration, dynamic fidelity, and military-grade reliability are essential.
FAQ
What is the operating temperature range for the AD678AJ?
The AD678AJ is rated for operation from –40°C to +85°C, corresponding to the "A" grade specification. This range is validated for AC parameters including S/N+D ratio, THD, and full-power bandwidth, making it suitable for industrial environments with wide thermal swings. DC parameters such as INL and gain error are specified as typical values at +25°C but not guaranteed across the full range.
Does the AD678AJ include an internal voltage reference?
Yes, the AD678AJ integrates a laser-trimmed 5 V voltage reference with output stability of 4.98 V to 5.02 V under load. REFOUT is provided on Pin 12 (JLCC), and REFIN (Pin 14) is internally connected to REFOUT through a 50 Ω resistor in standard configuration. This eliminates the need for external reference components in most unipolar and bipolar measurement setups.
How does the 8-bit versus 12-bit interface mode work on the AD678AJ?
The AD678AJ supports both modes via the 12/8 pin (Pin 19). When HIGH, DB11–DB0 operate as a 12-bit parallel bus. When LOW, data is multiplexed: DB11–DB4 carry the upper or lower byte based on R/L (Pin 26) and HBE (Pin 25) states. This allows seamless integration with 8-bit microcontrollers without requiring external latches or glue logic.
What are the power supply requirements for the AD678AJ?
The AD678AJ requires three separate supplies: +12 V (VCC, Pin 17), –12 V (VEE, Pin 8), and +5 V (VDD, Pin 43). Typical total power dissipation is 560 mW. Each supply must be decoupled locally with a 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor connected directly to AGND (Pin 11) to maintain dynamic performance and minimize ground bounce.
Can the AD678AJ be used in synchronous and asynchronous conversion modes?
Yes-the AD678AJ supports both modes via the SYNC pin (Pin 21). Tying SYNC to VDD enables synchronous operation where SC and EOC are gated by CS; tying SYNC to DGND enables asynchronous mode where SC initiates conversion independently of CS. In asynchronous mode, EOC becomes an open-drain output requiring a 3 kΩ pull-up resistor to VDD.
AD678AJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-CLCC (J-Lead)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- 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:
- Flash
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- ±12V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 44-JLCC (16.39x16.39)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD678AJ FAQ
1.How can I place an order for AD678AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD678AJ 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 AD678AJ reliable?
The price and inventory of AD678AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD678AJ is usually 5 days.
3.What payment methods are accepted for AD678AJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD678AJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD678AJ?
AD678AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD678AJ 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 AD678AJ?
For technical support, including AD678AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD678AJ requirements.
6.How does Aetrix verify that AD678AJ is sourced from the original manufacturer or authorized distributors?
All AD678AJ 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 AD678AJ meets industry standards.
7.What is the process for return or replacement of AD678AJ?
All AD678AJ units undergo pre-shipment inspection (PSI). If there is an issue with AD678AJ, 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 AD678AJ part is unused and in its original packaging.
Return procedure for AD678AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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