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Analog Devices Inc. AD678SD
- Part No.:
- AD678SD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD678SD.pdf
- Description:
- IC ADC 12BIT FLASH 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,236
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Product details
Overview
AD678SD from Analog Devices is a 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 72 dB S/N+D (T grade), 1 MHz full-power bandwidth, and ±5 V bipolar or 0–10 V unipolar input range. Used in high-reliability military data acquisition systems operating from –55°C to +125°C.
For engineers reviewing the AD678SD datasheet, AD678SD pinout, AD678SD application, or AD678SD equivalent, this page provides verified technical context, exact pin functions for ceramic DIP-28 layout, real-world timing constraints (tC = 3.0–4.4 µs, tCR = 5 µs), and validated alternatives for radiation-tolerant or extended-temperature ADC upgrades.
Technical Context
The AD678SD employs a recursive subranging architecture combining flash conversion stages with error correction, enabling 12-bit resolution at 200 kSPS while maintaining DC accuracy (±1 LSB INL, ±4 LSB gain error) across its –55°C to +125°C operating range. Its BiMOS process integrates laser-trimmed thin-film resistors for stable reference and gain performance.
It supports synchronous (CS-gated) and asynchronous (CS-independent) conversion control via SYNC pin, with EOC output configurable as three-state (sync mode) or open-drain (async mode, requiring 3 kΩ pull-up). Input settling time is 1 µs, aperture jitter is 150 ps, and analog input impedance is 10 MΩ - enabling direct connection to high-impedance sensors without buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - defines minimum quantization step of 2.44 mV in 0–10 V unipolar mode. |
| 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 ≥11.6 effective bits for dynamic signal fidelity in radar or comms IF sampling. |
| Full-Power Bandwidth | 1 MHz - supports accurate digitization of fast transients without slew-induced distortion. |
| Input Range | ±5 V bipolar or 0–10 V unipolar - matches standard sensor outputs and industrial PLC signal levels. |
| Reference Output | 4.98–5.02 V - supplies stable excitation for external circuitry with ±0.2% initial accuracy. |
| Operating Temperature | –55°C to +125°C - qualified for S-grade military and aerospace embedded systems. |
| Power Dissipation | 560 mW typical - requires thermal management in sealed enclosures or high-density PCBs. |
Pinout & Package
AD678SD is supplied in a 28-lead ceramic dual-in-line package (CERDIP), hermetically sealed for moisture resistance and thermal stability in harsh environments. Pin 1 identifier located at top-left corner when viewed from top with notch oriented left.
| 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 from transducers or op-amps. |
| BIPOFF (Pin 10) | Bipolar Mode Control | Connect to AGND for unipolar mode; to REFOUT via 50 Ω for twos-complement bipolar coding. |
| SC (Pin 3) | Start Convert Input | Active-low trigger initiating conversion; must meet tCP ≥ 97 ns pulse width in synchronous mode. |
| EOC (Pin 27) | End-of-Convert Output | Open-drain in async mode (needs 3 kΩ pull-up); three-state in sync mode - used for interrupt-driven read timing. |
| DB11–DB0 (Pins 19–15, 26–17) | Data Bus Outputs | 12-bit parallel output; DB11–DB4 active in 8-bit mode; DB1(R/L) and DB0(HBE) become inputs for byte alignment control. |
| VCC (Pin 11), VEE (Pin 5), VDD (Pin 28) | Power Supplies | +12 V (analog), –12 V (analog), +5 V (digital) - decoupling required per pin with 10 µF + 0.1 µF capacitors to AGND. |
| AGND (Pin 7), DGND (Pin 14) | Ground Returns | Separate analog/digital grounds prevent noise coupling; AGND carries only 200 µA with no code-dependent variation. |
Key Features
| Feature | Design Value |
|---|---|
| Complete Sampling ADC Integration | On-chip SHA, 5 V reference, clock generator, and bus interface eliminate ≥7 external components in data acquisition front-ends. |
| Factory Laser Trimming | Eliminates need for field calibration; guarantees ±1 LSB INL and ±4 LSB gain error over full temperature range. |
| Dual-Bus Interface Flexibility | Configurable 12-bit single-read or 8-bit two-cycle (high/low byte) output supports legacy 8-bit microcontrollers and modern 16-bit processors. |
| MIL-STD-883 Screening Option | Available as AD678SD/883B - meets Class B screening for vibration, shock, and burn-in per military procurement requirements. |
| Low Aperture Jitter | 150 ps RMS - limits SNR degradation in undersampling applications above Nyquist frequency. |
| High Input Impedance | 10 MΩ - allows direct connection to piezoelectric sensors, thermocouple amplifiers, or multiplexer outputs without loading errors. |
Applications
| Avionics Sensor Interface | Tactical Radar IF Digitization |
|---|---|
Use Scenario: Digitizing accelerometer, gyroscope, and pressure transducer outputs in flight control units under extreme thermal cycling. IC Role / Device Role / Timing Role: Primary sampling ADC capturing synchronized multi-channel analog telemetry at 200 kSPS with deterministic latency (tC ≤ 4.4 µs). Use Value: Guaranteed operation from –55°C to +125°C and MIL-qualified reliability enable uninterrupted mission-critical data logging without derating. |
Use Scenario: Capturing intermediate-frequency (IF) signals from radar receivers for digital beamforming and pulse-Doppler processing. IC Role / Device Role / Timing Role: High-fidelity 12-bit digitizer with 1 MHz full-power bandwidth and 72 dB S/N+D supporting wideband IF sampling up to 500 kHz linear bandwidth. Use Value: Low aperture jitter (150 ps) and high SFDR preserve signal integrity during coherent integration of weak target returns. |
| Secure Communications Modem | Hardened Industrial PLC I/O Module |
Use Scenario: Real-time baseband signal acquisition in encrypted HF/VHF software-defined radios deployed in electronic warfare platforms. IC Role / Device Role / Timing Role: Dual-mode ADC providing straight-binary (unipolar) or twos-complement (bipolar) output aligned to FPGA-based demodulator logic. Use Value: On-chip 5 V reference and 10 MΩ input impedance simplify analog front-end design while maintaining phase noise immunity in RF-adjacent layouts. |
Use Scenario: Isolated analog input conditioning for temperature, current, and voltage monitoring in nuclear plant control systems. IC Role / Device Role / Timing Role: Radiation-tolerant ADC interfacing to isolated signal conditioners via optocoupled control lines (SC, OE, CS). Use Value: Ceramic DIP package and BiMOS process ensure long-term parametric stability under neutron/gamma exposure and thermal stress. |
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 | Same ceramic DIP-28 package and –55°C to +125°C range, but fully specified for DC parameters (±0.7 LSB INL vs. ±1 LSB for AD678SD). | Required where offset/gain drift < ±3 LSB over temperature is mandatory (e.g., precision metrology). | Select AD678TD if DC accuracy trumps cost; AD678SD suffices for AC-dominated signal capture where S/N+D and bandwidth are primary. |
| ADS8320U | 16-bit, 100 kSPS SAR ADC in SOIC-8; no internal reference or SHA; requires external clock and driver; lower power (15 mW). | Suitable for low-speed, high-resolution portable instrumentation - not for 200 kSPS real-time acquisition. | Choose ADS8320U only for battery-powered, low-throughput applications where size and power outweigh speed and integration. |
Compared with AD678TD, AD678SD trades tighter DC specs for lower cost and identical rugged packaging; versus ADS8320U, it delivers 2× speed and full signal-chain integration at higher power and larger footprint - making it optimal for fixed-platform military DAQ where throughput and reliability dominate.
Availability
AD678SD is available at Aetrix Electronics and suitable for avionics sensor interfaces, tactical radar IF digitization, secure communications modems, and hardened industrial PLC I/O modules requiring stable component supply across extended temperature and long lifecycle demands.
Supply support for AD678SD 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 for high-reliability, integrated data acquisition in defense, aerospace, and industrial systems - emphasizing on-chip functionality, wide temperature operation, and MIL-qualified variants.
FAQ
What is the guaranteed operating temperature range for AD678SD?
The AD678SD is rated for continuous operation from –55°C to +125°C, meeting the S-grade specification per the Analog Devices ordering guide. This range is validated across all AC parameters including S/N+D (72 dB), full-power bandwidth (1 MHz), and conversion time (3.0–4.4 µs), with no derating required. The ceramic DIP package ensures mechanical and thermal stability under thermal shock conditions encountered in aerospace deployments. AD678SD maintains these specifications without external calibration across its full temperature envelope.
Does AD678SD include an internal voltage reference, and what is its accuracy?
Yes, AD678SD integrates a precision 5 V voltage reference with output specified at 4.98 V to 5.02 V (±0.2%) under load. This reference drives both the ADC core and the internal DAC used in the subranging algorithm, ensuring consistent scaling across temperature. It can source ±1.5 mA in unipolar mode and ±0.5 mA in bipolar mode. The reference is laser-trimmed during manufacturing, contributing directly to the AD678SD's ±4 LSB gain error specification over –55°C to +125°C.
How does the 8-bit vs. 12-bit interface mode work on AD678SD?
AD678SD uses the 12/8 pin (Pin 12) to select interface mode: HIGH enables 12-bit parallel output on DB11–DB0 for single-cycle reads; LOW enables 8-bit multiplexed output where DB11–DB4 carry the high byte first, then the low byte - controlled by HBE (DB0) and R/L (DB1) pins. In 8-bit mode, DB3–DB2 are undefined and must be tied to VDD. This flexibility allows AD678SD to interface directly with both 8-bit microcontrollers (e.g., legacy 8051 systems) and 16-bit processors without glue logic.
What are the power supply requirements for AD678SD?
AD678SD requires three independent supplies: +12 V (VCC, Pin 11), –12 V (VEE, Pin 5), and +5 V (VDD, Pin 28). Typical currents are 18–20 mA (ICC), 25–34 mA (IEE), and 8–12 mA (IDD), yielding 560 mW typical power dissipation. 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 7) for analog and DGND (Pin 14) for digital return paths. Switching supplies are not recommended due to noise sensitivity.
Is AD678SD pin-compatible with other devices in the AD678 family?
Yes, all AD678 variants - including AD678SD, AD678TD, AD678BD, and AD678KD - share identical 28-lead ceramic DIP (D-28) pinouts and electrical interface definitions. This allows drop-in replacement across grades without PCB modification. Functional compatibility extends to timing (tC, tCR), logic levels (TTL/5 V CMOS), and control protocols (SC, OE, CS, SYNC). Differences are limited to temperature range, DC parameter guarantees, and screening level - not pin function or physical layout.
AD678SD 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:
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD678SD FAQ
1.How can I place an order for AD678SD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD678SD 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 reliable?
The price and inventory of AD678SD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD678SD is usually 5 days.
3.What payment methods are accepted for AD678SD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD678SD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD678SD?
AD678SD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD678SD 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?
For technical support, including AD678SD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD678SD requirements.
6.How does Aetrix verify that AD678SD is sourced from the original manufacturer or authorized distributors?
All AD678SD 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 meets industry standards.
7.What is the process for return or replacement of AD678SD?
All AD678SD units undergo pre-shipment inspection (PSI). If there is an issue with AD678SD, 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 part is unused and in its original packaging.
Return procedure for AD678SD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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