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Analog Devices Inc. AD679BD
- Part No.:
- AD679BD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD679BD.pdf
- Description:
- IC ADC 14BIT FLASH 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,672
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Product details
Overview
AD679BD from Analog Devices is a complete 14-bit, 128 kSPS monolithic sampling ADC integrating sample-and-hold amplifier (SHA), voltage reference, clock generator, and 8-bit bus interface. It delivers 78 dB S/N+D (K/B/T grades), 1 MHz full-power bandwidth, and 10 MΩ input impedance for direct connection to unbuffered sources in precision data acquisition systems.
For engineers reviewing the AD679BD datasheet, AD679BD pinout, AD679BD application, or AD679BD equivalent, this page provides verified technical context, real-world timing behavior, bipolar/unipolar mode configuration details, factory-trimmed DC accuracy specs, and validated alternatives for measurement-grade signal digitization in industrial control and test equipment.
Technical Context
The AD679BD employs a recursive subranging architecture with error correction and flash converter circuitry to achieve 14-bit resolution at 128 kSPS. Its on-chip SHA supports 1.5 µs input settling time and 150 ps aperture jitter, enabling accurate undersampling of signals up to 1 MHz.
It operates from +5 V (VDD), ±12 V (VCC/VEE) supplies, dissipating 560 mW typical. Pin-compatible with AD678, it supports synchronous (CS-gated) and asynchronous (CS-independent) conversion modes via SYNC pin configuration, with EOC signaling conversion status through open-drain (asynchronous) or three-state (synchronous) output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees 1 LSB = 0.61 mV step size over 10 V full-scale range |
| Sampling Rate | 128 kSPS - enables real-time capture of signals up to 500 kHz linear bandwidth without aliasing degradation |
| S/N+D Ratio | 78 dB (min, K/B/T grades) - ensures ≥12.7 effective bits for low-noise signal analysis |
| Input Range | ±5 V bipolar or 0–10 V unipolar - supports both signed and unsigned sensor outputs without external scaling |
| Full Power BW | 1 MHz - allows digitization of fast transients and RF envelope detection within Nyquist limit |
| INL / DNL | ±2.5 / ±1 LSB (max, B grade) - maintains monotonicity and linearity critical for closed-loop control feedback |
| Power Supply | +5 V (VDD), ±12 V (VCC/VEE) - separates analog and digital domains to minimize noise coupling |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including motor drives and PLC I/O modules |
Pinout & Package
AD679BD is supplied in a 28-lead ceramic DIP (D-28) package with 0.3-inch body width and 0.1-inch lead pitch. Pin 1 identifier is marked with a notch or dot; pins are arranged in dual-in-line configuration with analog and digital grounds isolated per functional domain.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (Pin 6) | Analog Input | High-impedance (10 MΩ) node accepting ±5 V or 0–10 V signals directly; no external buffer required |
| BIPOFF (Pin 10) | Mode Configuration | Tie to AGND for unipolar mode (straight binary); tie to REFOUT for bipolar mode (twos complement) |
| REFOUT (Pin 8) | Reference Output | 5.00 V ±20 mV source for internal reference and external gain/offset trimming circuits |
| SC (Pin 3) | Digital Input | Active-low start-convert trigger; must be pulsed (not held low) to avoid accuracy degradation |
| EOC (Pin 27) | Digital Output | Open-drain in asynchronous mode (requires 3 kΩ pull-up); three-state in synchronous mode |
| HBE (Pin 15) | Digital Input | Selects high-byte (LOW) or low-byte (HIGH) output on DB7–DB0 during 14-bit two-read access |
| DGND (Pins 12, 14) | Ground Reference | Digital ground return for VDD and all logic I/O; must be separated from AGND except at single-point star ground |
| VCC / VEE (Pins 11 / 5) | Analog Power | +12 V and –12 V analog supply rails powering SHA and core converter; decoupling mandatory |
Key Features
| Feature | Design Value |
|---|---|
| Complete Integration | On-chip SHA, 5 V reference, clock, and 8-bit bus interface eliminate external components for fully specified sampling function |
| Factory-Trimmable Accuracy | Offset and gain errors adjustable via external 50 Ω pots-supports calibration to ≤0.05% FSR zero/gain error in unipolar/bipolar modes |
| Two-Read Data Access | 14-bit result left-justified across DB7–DB0 in two 8-bit reads (high byte first), compatible with standard 8-bit microprocessor buses |
| MIL-STD-883 Option | Screened versions available for military/aerospace use-ensures reliability under extended temperature and vibration stress |
| BiMOS Process Technology | Combines low-noise bipolar front-end with low-power CMOS logic for long-term stability and low thermal drift |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous digitization of thermocouple, strain gauge, and pressure transducer outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Primary sampling ADC performing synchronized 128 kSPS conversions with 1.5 µs input settling and 150 ps aperture jitter. Use Value: Factory-trimmed INL (±2.5 LSB max) and gain error (±0.11% FSR) ensure <0.01% measurement uncertainty over –40°C to +85°C. |
Use Scenario: High-fidelity waveform capture in benchtop oscilloscopes and signal analyzers requiring >75 dB dynamic range. IC Role / Device Role / Timing Role: Signal-path ADC operating in bipolar mode with twos complement output for FFT-based spectral analysis. Use Value: 78 dB S/N+D and 500 kHz full-linear bandwidth enable accurate reconstruction of multi-tone test signals without slew-induced distortion. |
| Motor Drive Current Sensing | Medical Instrumentation |
Use Scenario: Isolated phase current sampling in servo drives using shunt resistors and op-amp conditioning stages. IC Role / Device Role / Timing Role: Precision ADC interfacing to unbuffered 10 MΩ input with direct connection to differential amplifier outputs. Use Value: 10 MΩ input impedance prevents loading of high-Z sensor interfaces; 1 MHz full-power bandwidth captures PWM switching artifacts. |
Use Scenario: Digitizing ECG, EEG, and EMG bio-potential signals in portable diagnostic devices with battery-powered operation. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC supporting unipolar 0–10 V input range with straight binary coding for microcontroller compatibility. Use Value: 560 mW typical power dissipation enables thermal management in compact enclosures; ±0.07% FSR zero error ensures baseline stability in long-duration recordings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7792BRUZ | 24-bit Σ-Δ architecture, 4.17–470 SPS, built-in PGA and reference; no on-chip SHA or clock | Better resolution for low-frequency (<10 Hz) sensor readings; unsuitable for >10 kSPS real-time acquisition | Select AD7792BRUZ only when ultra-high DC precision outweighs speed requirements; AD679BD remains optimal for 100+ kSPS applications. |
| ADS8505IPFB | 16-bit SAR, 250 kSPS, 5 V single supply, no internal reference; requires external REF and clock | Higher speed and resolution but demands full external support circuitry and layout attention | Choose ADS8505IPFB if system already includes precision 5 V reference and clock distribution; AD679BD reduces BOM count and layout complexity. |
Compared with AD7792BRUZ and ADS8505IPFB, the AD679BD uniquely balances 14-bit resolution, 128 kSPS throughput, and full integration-including SHA, reference, and clock-making it the most self-contained solution for industrial data loggers and real-time control loops requiring minimal external components.
Availability
AD679BD is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, motor drive current sensing, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD679BD 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 AD679BD belongs to Analog Devices' legacy high-speed precision ADC product line, designed specifically for industrial and instrumentation applications demanding integrated signal conditioning, guaranteed DC accuracy, and robust operation from –40°C to +85°C.
FAQ
What is the operating temperature range for the AD679BD?
The AD679BD is rated for operation from –40°C to +85°C (B grade), making it suitable for industrial environments such as factory automation, motor control cabinets, and outdoor telemetry systems where ambient temperatures exceed commercial limits. This range is fully characterized for both AC and DC specifications, including INL, gain error, and S/N+D ratio.
How does the AD679BD handle bipolar versus unipolar input configurations?
The AD679BD selects input mode via the BIPOFF pin: tying BIPOFF to AGND configures unipolar mode (0–10 V input, straight binary output), while connecting BIPOFF to REFOUT enables bipolar mode (±5 V input, twos complement output). Both modes share the same 14-bit resolution and 128 kSPS rate, with identical DC accuracy specs across the full temperature range.
Can the AD679BD operate without external calibration components?
Yes-the AD679BD is factory trimmed for offset, gain, and linearity, so basic operation requires only power supplies, decoupling capacitors, and proper grounding. External 50 Ω trim pots are optional and needed only when application-level accuracy demands tighter than ±0.07% FSR zero error or ±0.11% FSR gain error, as specified for the B grade.
What are the power supply requirements for the AD679BD?
The AD679BD requires three independent supplies: +5 V (VDD, Pin 28) for digital logic, +12 V (VCC, Pin 11) for the analog positive rail, and –12 V (VEE, Pin 5) for the analog negative rail. Each supply must be decoupled with ≥10 µF tantalum and 0.1 µF ceramic capacitors close to the respective pins to maintain 78 dB S/N+D performance and prevent digital noise coupling into the analog path.
Is the AD679BD pin-compatible with other members of the AD67x family?
Yes-the AD679BD shares identical pinout and footprint with the AD678 (12-bit, 200 kSPS) and AD679J/K variants, enabling drop-in upgrades in existing designs. All share the same 28-pin ceramic DIP package, identical signal routing for AIN, REFOUT, SC, EOC, and DB7–DB0, and compatible timing interfaces-though AD679BD's higher resolution and lower maximum sampling rate require firmware validation.
AD679BD 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:
- Flash
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±12V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD679BD FAQ
1.How can I place an order for AD679BD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD679BD 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 AD679BD reliable?
The price and inventory of AD679BD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD679BD is usually 5 days.
3.What payment methods are accepted for AD679BD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD679BD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD679BD?
AD679BD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD679BD 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 AD679BD?
For technical support, including AD679BD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD679BD requirements.
6.How does Aetrix verify that AD679BD is sourced from the original manufacturer or authorized distributors?
All AD679BD 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 AD679BD meets industry standards.
7.What is the process for return or replacement of AD679BD?
All AD679BD units undergo pre-shipment inspection (PSI). If there is an issue with AD679BD, 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 AD679BD part is unused and in its original packaging.
Return procedure for AD679BD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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