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Analog Devices Inc. AD678BJ
- Part No.:
- AD678BJ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-CLCC (J-Lead)
- Datasheet:
-
AD678BJ.pdf
- Description:
- IC ADC 12BIT FLASH 44JLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,766
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Product details
Overview
AD678BJ from Analog Devices is a complete 12-bit monolithic sampling analog-to-digital converter featuring integrated sample-hold amplifier, on-board 5 V reference, clock generation, and microprocessor-compatible bus interface. It delivers 200 kSPS throughput, 1 MHz full-power bandwidth, 72 dB S/N+D (B grade), and supports ±5 V bipolar or 0–10 V unipolar input ranges. It is used in precision data acquisition systems requiring ac/dc-specified performance across industrial temperature range.
For engineers reviewing the AD678BJ datasheet, AD678BJ pinout, AD678BJ application, or AD678BJ equivalent, this page provides verified technical context, validated pin functions, confirmed DC/AC specifications for the B-grade 44-lead JLCC variant, and real-world interface guidance for 8-bit and 12-bit bus configurations.
Technical Context
The AD678BJ implements a recursive subranging architecture with flash converter circuitry and error correction to achieve 12-bit resolution at 200 kSPS. Its sample-hold amplifier provides 1 µs input settling time and 150 ps aperture jitter, enabling accurate digitization of signals up to 1 MHz full-power bandwidth.
It supports dual digital interface modes: 12-bit parallel output (via DB11–DB0) or 8-bit multiplexed output (DB11–DB4 with R/L and HBE control), with straight binary (unipolar) or twos complement (bipolar) coding. Internal BiMOS process combines CMOS logic and bipolar precision circuits, laser-trimmed thin-film resistors ensure dc accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - defines smallest detectable voltage step (2.44 mV in 10 V range) |
| Sampling Rate | 200 kSPS - enables real-time capture of signals up to 100 kHz Nyquist frequency |
| S/N+D Ratio | 72 dB (B grade) - ensures ≥11.6 effective bits for dynamic signal fidelity |
| Full-Power Bandwidth | 1 MHz - supports accurate digitization of fast transients without amplitude loss |
| Input Range | ±5 V bipolar or 0–10 V unipolar - direct compatibility with industrial sensor outputs |
| Integral Nonlinearity | ±0.7 LSB (B grade) - guarantees monotonicity and <0.017% linearity error |
| Supply Voltages | +12 V (VCC), –12 V (VEE), +5 V (VDD) - separates analog/digital domains to minimize noise coupling |
Pinout & Package
AD678BJ is housed in a 44-lead J-leaded ceramic chip carrier (JLCC) package with 0.025" lead pitch, hermetically sealed for industrial reliability and thermal stability over –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN | Analog Input | High-impedance (10 MΩ) node accepting ±5 V or 0–10 V signals directly from sensors or multiplexers |
| AGND / DGND | Analog/Digital Ground | Separate ground returns isolate analog signal path from digital switching noise |
| VCC / VEE / VDD | Analog/Digital Supplies | +12 V/–12 V analog rails and +5 V digital rail enable independent power domain optimization |
| DB11–DB0 | Data Outputs | Three-state TTL/CMOS-compatible outputs supporting 12-bit parallel or 8-bit multiplexed readout |
| CS / OE / SC / EOCEN | Digital Control | Standard microprocessor handshake signals for synchronous/asynchronous conversion triggering and data gating |
| REFOUT / REFIN / BIPOFF | Reference Interface | On-chip 5 V reference with external resistor network enables precise bipolar/unipolar mode selection and trimming |
| SYNC / 12/8 / R/L / HBE | Interface Configuration | Mode-select pins define bus width (8/12-bit), data justification (left/right), and byte enable sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Complete Integration | Combines SHA, ADC, 5 V reference, clock, and bus interface on single die-eliminates 12+ external components vs. discrete designs |
| AC/DC Characterization | B-grade fully specified for both dynamic (S/N+D, THD) and static (INL, gain error) parameters-valid for measurement and signal processing |
| Flexible Bus Interface | Supports 8-bit (two-cycle) or 12-bit (single-cycle) readout with programmable justification-enables drop-in use with legacy 8-bit or modern 16-bit controllers |
| Factory Laser Trimming | Eliminates need for external calibration potentiometers-guarantees ±0.7 LSB INL and ±3 LSB gain error without user adjustment |
| MIL-STD-883 Screening Option | Available in Class B screened versions-meets reliability requirements for aerospace and defense embedded systems |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA loop outputs, thermocouple signals, and strain gauge bridges in PLC I/O modules. IC Role / Device Role / Timing Role: Primary sampling ADC performing synchronized 200 kSPS conversions with 1 µs settling to support multi-channel scan rates. Use Value: 10 MΩ input impedance allows direct connection to high-Z sensors; ±0.7 LSB INL ensures <0.02% measurement uncertainty over full industrial temperature range. | Use Scenario: Digitizing waveform outputs from function generators, spectrum analyzers, and oscilloscope front-ends. IC Role / Device Role / Timing Role: High-fidelity acquisition engine capturing transient events with 72 dB S/N+D and 1 MHz full-power bandwidth. Use Value: 150 ps aperture jitter and 500 kHz full-linear bandwidth preserve signal integrity for FFT-based spectral analysis. |
| Avionics Sensor Interfaces | Medical Diagnostic Systems |
Use Scenario: Converting pressure, temperature, and inertial sensor outputs in flight control computers and health monitoring units. IC Role / Device Role / Timing Role: Radiation-tolerant ADC operating across –40°C to +85°C with MIL-STD-883 screening option for mission-critical timing. Use Value: Dual supply (±12 V) operation and separate AGND/DGND reduce ground-loop errors in distributed avionics architectures. | Use Scenario: Sampling ECG, EEG, and ultrasound analog front-ends where low distortion and calibrated dc accuracy are essential. IC Role / Device Role / Timing Role: Precision acquisition component delivering twos complement bipolar output for differential biopotential signals. Use Value: Bipolar zero error ≤±3 LSB and gain drift ≤±4 LSB/°C ensure stable baseline and amplitude fidelity across patient temperature variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD678BD | Same 28-lead ceramic DIP package; identical B-grade AC/DC specs but different thermal mass and layout footprint | Preferred for through-hole prototyping or legacy board reuse where 44-pin JLCC rework is impractical | Select AD678BD when mechanical compatibility with existing DIP layouts outweighs surface-mount density advantages |
| AD7874BQ | 12-bit, 100 kSPS SAR ADC; no internal reference or SHA; requires external clock and reference; lower power (120 mW) | Used in lower-speed, lower-power portable instrumentation where 200 kSPS is unnecessary | Choose AD7874BQ only if system prioritizes power efficiency over speed and integration level |
Compared with AD678BD and AD7874BQ, the AD678BJ uniquely combines 200 kSPS throughput, on-chip SHA/reference, and industrial-grade dc accuracy in a surface-mount JLCC package-making it optimal for space-constrained, high-reliability data acquisition where full functional integration matters.
Availability
AD678BJ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, avionics sensor interfaces, and medical diagnostic systems requiring stable component supply across extended temperature operation.
Supply support for AD678BJ 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 AD678 product line was designed as a complete, single-chip sampling ADC solution for industrial and military data acquisition systems demanding guaranteed ac/dc performance without external support components.
FAQ
What is the operating temperature range for the AD678BJ?
The AD678BJ is rated for operation from –40°C to +85°C, corresponding to the B-grade industrial temperature specification. This range is validated for all ac and dc parameters including INL (±0.7 LSB), S/N+D (72 dB), and gain error (±3 LSB), making it suitable for harsh industrial environments where thermal stability is critical. The AD678BJ achieves this via ceramic JLCC packaging and BiMOS process design.
Does the AD678BJ require external clock circuitry?
No, the AD678BJ includes fully integrated clock generation circuitry and does not require an external clock source. Its internal oscillator supports the rated 200 kSPS sampling rate without external components. However, the SYNC pin allows optional external synchronization: tying SYNC to VDD enables synchronous mode (SC gated by CS), while tying SYNC to DGND enables asynchronous mode (SC independent of CS).
How does the AD678BJ handle bipolar versus unipolar input configurations?
The AD678BJ supports both modes via the BIPOFF pin: connect BIPOFF to AGND for 0–10 V unipolar input with straight binary coding; connect BIPOFF to REFOUT through a 50 Ω resistor for ±5 V bipolar input with twos complement coding. The internal reference and gain stage are auto-configured based on this connection, and the AD678BJ maintains ±3 LSB bipolar zero error and ±3 LSB gain error in B-grade operation.
What digital interface options does the AD678BJ support?
The AD678BJ supports two interface formats selected by the 12/8 pin: when HIGH, it enables 12-bit parallel output on DB11–DB0 for single-cycle 16-bit bus access; when LOW, it enables 8-bit multiplexed output on DB11–DB4 with R/L (right/left justify) and HBE (high-byte enable) controlling sequential high/low byte reads. Both modes use standard TTL/CMOS levels and three-state drivers gated by CS and OE.
Is the AD678BJ pin-compatible with any higher-resolution alternatives?
Yes-the AD678BJ shares the same 44-lead JLCC pinout as the 14-bit AD679BJ (128 kSPS), enabling a hardware-upgrade path to higher resolution without PCB redesign. However, the AD679BJ uses different internal architecture (subranging vs. pipeline) and has distinct timing (e.g., longer conversion time), so firmware timing must be adjusted. No other 12-bit ADCs share the AD678BJ's exact pin mapping.
AD678BJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-CLCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
AD678BJ FAQ
1.How can I place an order for AD678BJ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD678BJ 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 AD678BJ reliable?
The price and inventory of AD678BJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD678BJ is usually 5 days.
3.What payment methods are accepted for AD678BJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD678BJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD678BJ?
AD678BJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD678BJ 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 AD678BJ?
For technical support, including AD678BJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD678BJ requirements.
6.How does Aetrix verify that AD678BJ is sourced from the original manufacturer or authorized distributors?
All AD678BJ 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 AD678BJ meets industry standards.
7.What is the process for return or replacement of AD678BJ?
All AD678BJ units undergo pre-shipment inspection (PSI). If there is an issue with AD678BJ, 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 AD678BJ part is unused and in its original packaging.
Return procedure for AD678BJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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