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Analog Devices Inc. AD678SD/883B
- Part No.:
- AD678SD/883B
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
AD678SD/883B.pdf
- Description:
- IC ADC 12BIT 200KSPS 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,099
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Product details
Overview
AD678SD/883B from Analog Devices is a military-grade, 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-bit/12-bit) parallel bus interface. It delivers 72 dB S/N+D (T grade), 1 MHz full-power bandwidth, and operates across –55°C to +125°C in a 28-lead ceramic DIP package. It is used in ruggedized data acquisition systems requiring high dynamic performance under extreme temperature conditions.
For engineers reviewing the AD678SD/883B datasheet, AD678SD/883B pinout, AD678SD/883B application, or AD678SD/883B equivalent, this page provides verified technical context, MIL-STD-883B-compliant specifications, validated pin functions for synchronous/asynchronous operation, and real-world design implications of its 12-bit twos-complement/unipolar coding, aperture jitter (150 ps), and ±1 LSB INL - all critical for precision signal capture in avionics and defense electronics.
Technical Context
The AD678SD/883B implements a recursive subranging architecture combining flash converter stages with error correction logic to achieve 12-bit resolution at 200 kSPS. Its sample-hold amplifier features 10 MΩ input impedance and 1 µs settling time, enabling direct connection to high-impedance sources without buffering.
It supports two digital interface modes: 12-bit parallel output (single read via DB11–DB0) or 8-bit multiplexed output (two reads with R/L and HBE control), with straight binary (unipolar) or twos-complement (bipolar) coding. Internal voltage reference is trimmed to 4.98–5.02 V and supplies ±0.5 mA in bipolar mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - defines smallest detectable analog change as 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 (T grade) - ensures usable dynamic range for low-level signal recovery in noisy environments. |
| Full-Power Bandwidth | 1 MHz - supports accurate digitization of fast transients without amplitude loss. |
| Aperture Jitter | 150 ps - limits sampling uncertainty-induced noise floor degradation at high input frequencies. |
| INL | ±1 LSB - guarantees monotonicity and absence of missing codes across full temperature range. |
| Supply Voltages | +12 V (VCC), –12 V (VEE), +5 V (VDD) - requires triple-rail analog/digital separation for optimal noise immunity. |
| Operating Temperature | –55°C to +125°C - qualified per MIL-STD-883B screening for extended-life deployment in harsh platforms. |
Pinout & Package
AD678SD/883B is housed in a 28-lead hermetically sealed ceramic dual-in-line package (CERDIP), screened to MIL-STD-883B Class B. Pin 1 identifier located at top-left corner; pins 2, 4, 7, 9, 13, 16, 18, 20, 22, 24, 28 are NC and must be tied to DGND or VDD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (Pin 6) | Analog Input | High-impedance (10 MΩ) node accepting ±5 V (bipolar) or 0–10 V (unipolar); directly interfaces unbuffered sensors/multiplexers. |
| BIPOFF (Pin 10) | Bipolar Mode Control | Configures coding format: tie to AGND for unipolar/straight binary; tie to REFOUT via 50 Ω for bipolar/twos-complement. |
| CS (Pin 4) | Digital Enable | Active-low chip select; gates SC, OE, and EOC in synchronous mode (SYNC = VDD). |
| SC (Pin 3) | Conversion Trigger | Falling edge initiates conversion; requires tSC = 50 ns setup before CS in synchronous mode. |
| EOC (Pin 27) | Status Output | Open-drain in asynchronous mode (needs 3 kΩ pull-up); three-state in synchronous mode; indicates conversion completion. |
| DB11–DB0 (Pins 19–15, 26–17) | Data Bus | Three-state outputs: 12-bit parallel (12/8 = HIGH) or 8-bit multiplexed (12/8 = LOW with R/L/HBE control). |
| VCC/VEE/VDD (Pins 11, 5, 28) | Power Rails | +12 V (analog positive), –12 V (analog negative), +5 V (digital); decoupling required per supply pin. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 5 V reference | Trimmed to 4.98–5.02 V with ±0.5 mA load capability - eliminates external reference IC and reduces calibration drift. |
| Factory laser-trimmed INL/DNL | ±1 LSB INL and guaranteed monotonicity - removes need for system-level linearity correction in closed-loop control. |
| Configurable digital interface | Supports both 8-bit and 12-bit bus widths - enables reuse across legacy 8-bit microcontrollers and modern 16-bit processors without redesign. |
| MIL-STD-883B Class B screening | Includes burn-in, temperature cycling, and hermeticity testing - ensures reliability in mission-critical aerospace and defense deployments. |
| 10 MΩ input impedance | Enables direct connection to high-Z sources (e.g., piezoelectric sensors, thermocouples) without gain-stage loading errors. |
Applications
| Avionics Flight Data Recorder | Tactical Radar Signal Digitizer |
|---|---|
Use Scenario: Continuous recording of analog sensor outputs (accelerometers, gyros, pressure transducers) in fighter jet flight control systems. IC Role / Device Role / Timing Role: Primary sampling ADC capturing synchronized multi-channel analog telemetry at 200 kSPS with deterministic latency. Use Value: 1 MHz full-power bandwidth and 150 ps aperture jitter preserve transient fidelity during high-G maneuvers; –55°C to +125°C operation ensures functionality across stratospheric to desert thermal profiles. | Use Scenario: Digitizing intermediate-frequency (IF) radar return signals in ground-based electronic warfare receivers. IC Role / Device Role / Timing Role: High-fidelity IF sampling front-end preceding digital downconversion and pulse-Doppler processing. Use Value: 72 dB S/N+D and 500 kHz full-linear bandwidth enable detection of weak targets amid clutter; bipolar mode supports AC-coupled IF inputs with DC offset rejection. |
| Missile Guidance Inertial Measurement Unit | Nuclear Power Plant Safety Monitoring System |
Use Scenario: Real-time conditioning and digitization of MEMS gyro and accelerometer outputs in inertial navigation subsystems. IC Role / Device Role / Timing Role: Precision analog front-end ADC providing calibrated 12-bit data to guidance computer via 16-bit bus interface. Use Value: ±1 LSB INL and factory trimming eliminate field recalibration; MIL-STD-883B qualification ensures survivability during launch vibration and re-entry thermal shock. | Use Scenario: Long-term monitoring of reactor coolant temperature, pressure, and neutron flux signals in safety-critical instrumentation channels. IC Role / Device Role / Timing Role: Radiation-tolerant, long-lifetime ADC performing periodic high-accuracy measurements in redundant safety loops. Use Value: Hermetic ceramic DIP package and –55°C to +125°C rating support 40+ year operational life; 10 MΩ input impedance minimizes leakage-induced drift in high-resistance RTD circuits. |
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 |
|---|---|---|---|
| AD678TD/883B | Same package and temperature range, but fully specified for DC parameters (±0.7 LSB INL typ, ±3 LSB gain error) vs. AD678SD/883B's AC-only spec (±1 LSB INL). | Preferred where absolute accuracy (e.g., calibration standards, metrology) matters more than dynamic performance alone. | Select AD678TD/883B when system-level DC calibration is impractical and tighter INL/gain specs are required. |
| AD7874BQ | 12-bit, 100 kSPS, single +5 V supply, no internal reference; requires external REF and clock; 70 dB S/N+D; –40°C to +85°C. | Suitable for commercial/industrial systems with lower speed and simpler power architecture, but lacks MIL-qualification and onboard timing. | Choose AD7874BQ only if cost, single-supply operation, and reduced feature set align with non-military requirements. |
Compared with AD678TD/883B, AD678SD/883B trades tighter DC accuracy for lower cost and identical AC performance in harsh environments; versus AD7874BQ, it provides integrated reference, clock, and MIL-qualification at higher speed and wider temperature range - making it irreplaceable in certified defense platforms.
Availability
AD678SD/883B is available at Aetrix Electronics and suitable for avionics flight data recorders, tactical radar signal digitizers, missile guidance IMUs, and nuclear plant safety monitoring systems requiring stable component supply under extended temperature and long-lifecycle conditions.
Supply support for AD678SD/883B 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 specifically for high-reliability, wide-temperature-range data acquisition in defense, aerospace, and industrial control - integrating precision analog front-ends with robust digital interfacing in monolithic BiMOS technology.
FAQ
What is the operating temperature range of the AD678SD/883B?
The AD678SD/883B is rated for operation from –55°C to +125°C and is screened per MIL-STD-883B Class B, including temperature cycling and burn-in. This makes it suitable for deployment in extreme environments such as jet engine bays, missile guidance sections, and space-qualified payloads where thermal stability is non-negotiable. The AD678SD/883B maintains its 72 dB S/N+D and ±1 LSB INL across this full range without derating.
Does the AD678SD/883B require external clock circuitry?
No, the AD678SD/883B contains fully integrated clock generation circuitry and does not require an external clock source. Its internal oscillator supports the rated 200 kSPS sampling rate with deterministic timing; SYNC, SC, and EOC signals coordinate conversion sequencing. External clocks may be used only in custom configurations - but doing so voids AC performance guarantees and invalidates MIL-STD-883B compliance for the AD678SD/883B.
How is bipolar vs. unipolar mode selected on the AD678SD/883B?
Bipolar or unipolar mode on the AD678SD/883B is selected by the connection of the BIPOFF pin (Pin 10): tie BIPOFF to AGND for unipolar 0–10 V input with straight binary output; tie BIPOFF to REFOUT through a 50 Ω ±1% resistor for bipolar ±5 V input with twos-complement output. This hardware-selectable configuration avoids software overhead and ensures deterministic coding behavior at power-on reset.
What are the power supply requirements for the AD678SD/883B?
The AD678SD/883B requires three independent supplies: +12 V (VCC, Pin 11), –12 V (VEE, Pin 5), and +5 V (VDD, Pin 28). Typical power dissipation is 560 mW. Each supply must be decoupled with a 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor placed adjacent to the respective pin and referenced to AGND (analog ground) - not DGND - to maintain PSRR performance and prevent digital noise coupling into the analog path.
Is the AD678SD/883B pin-compatible with other AD678 variants?
Yes, the AD678SD/883B shares identical pinout and footprint with all 28-lead ceramic DIP versions of the AD678 family, including AD678TD/883B, AD678BD, and AD678KD. This allows drop-in replacement within the same package variant, provided system-level validation accounts for differences in DC specification coverage (e.g., AD678SD/883B is AC-characterized only, while AD678TD/883B includes full DC testing). No PCB layout changes are needed for substitution among DIP-packaged AD678 grades.
AD678SD/883B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
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- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
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AD678SD/883B FAQ
1.How can I place an order for AD678SD/883B through Aetrix?
Please submit a Request for Quotation (RFQ) for AD678SD/883B 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 AD678SD/883B reliable?
The price and inventory of AD678SD/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD678SD/883B is usually 5 days.
3.What payment methods are accepted for AD678SD/883B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD678SD/883B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD678SD/883B?
AD678SD/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD678SD/883B 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 AD678SD/883B?
For technical support, including AD678SD/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD678SD/883B requirements.
6.How does Aetrix verify that AD678SD/883B is sourced from the original manufacturer or authorized distributors?
All AD678SD/883B 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 AD678SD/883B meets industry standards.
7.What is the process for return or replacement of AD678SD/883B?
All AD678SD/883B units undergo pre-shipment inspection (PSI). If there is an issue with AD678SD/883B, 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 AD678SD/883B part is unused and in its original packaging.
Return procedure for AD678SD/883B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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