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Analog Devices Inc. AD7878SQ/883B
- Part No.:
- AD7878SQ/883B
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
AD7878SQ/883B.pdf
- Description:
- IC ADC 12BIT 28CERDIP
- Quantity:
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Product details
Overview
AD7878SQ/883B from Analog Devices is a radiation-hardened, high-speed 12-bit successive-approximation ADC with integrated track/hold, 3 V Zener reference, and 8-word FIFO-designed for military/aerospace DSP interfacing at 100 kHz sampling rate, ±3 V bipolar input range, and 70 dB SNR at 10 kHz. It operates across –55°C to +125°C and interfaces directly with ADSP-2100, TMS32010, and TMS32020 processors.
For engineers reviewing the AD7878SQ/883B datasheet, AD7878SQ/883B pinout, AD7878SQ/883B application, or AD7878SQ/883B equivalent, key selection criteria include its MIL-STD-883B Class B qualification, 57 ns data access time, FIFO programmable almost-full threshold, BUSY-synchronized read/write control, and LC2MOS process-based immunity to latch-up in harsh environments.
Technical Context
The AD7878SQ/883B implements a fully synchronous 12-bit SAR architecture clocked by an external 8 MHz TTL-compatible CLK IN, with internal division-by-four for bit trial timing (500 ns min). Its conversion sequence includes 13 decision cycles (12 data bits + 1 out-of-range flag), followed by SAR-to-FIFO transfer synchronized to CLK IN.
It features dual-domain power supplies (VDD = +5 V, VSS = –5 V, VCC = +5 V), separate analog/digital grounds (AGND/DGND), and a status/control register accessible via ADD0-high reads/writes-enabling real-time FIFO word count monitoring, ALFL interrupt programming (1–8 words), and output disable during BUSY assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit monotonic, no missing codes guaranteed-ensures full-scale linearity for precision spectral analysis and servo feedback loops. |
| Sampling Rate | 100 kHz maximum-supports Nyquist-limited digitization of signals up to 50 kHz without aliasing in spectrum analyzers or modems. |
| Signal-to-Noise Ratio | 70 dB min at 10 kHz input-meets dynamic fidelity requirements for speech synthesis and high-speed modem baseband processing. |
| Data Access Time | 57 ns max-enables direct connection to ADSP-2100 and TMS32020 without wait-state insertion in real-time control systems. |
| Analog Input Range | ±3 V bipolar-matches standard industrial sensor outputs and eliminates need for external level-shifting circuitry. |
| FIFO Depth | 8-word first-in, first-out buffer-reduces DSP interrupt overhead by allowing burst reads after multiple conversions, critical in servo control. |
| Reference Output | 3.0 V ±15 mV over –55°C to +125°C-provides stable scaling for absolute measurement accuracy without external reference components. |
| Supply Voltages | VDD = +5 V ±5%, VSS = –5 V ±5%, VCC = +5 V ±5%-supports robust operation in wide-temperature military platforms with discrete rail regulation. |
Pinout & Package
AD7878SQ/883B is supplied in a 28-lead cerdip (Q-28) hermetic package rated for –55°C to +125°C operation and compliant with MIL-STD-883B Class B screening.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–10, 20–28 | Power, ground, clock, control, and data I/O | Includes dedicated VDD/VSS/AGND/DGND rails, asynchronous CONVST, TTL-compatible CLK IN, and 12-bit three-state DB11–DB0 bus with DB5-controlled output disable during BUSY. |
| ADD0 | Address select | Determines read target: logic low → FIFO data word; logic high → status/control register-enables atomic status polling without FIFO pointer corruption. |
| CS, DMRD, DMWR | Chip select & memory interface | Standard DSP bus protocol signals (e.g., maps to ADSP-2100 DMRD/DMWR); CS-active enables all control logic, DMRD enables output drivers, DMWR enables register writes. |
| BUSY | Conversion status indicator | Active-low open-drain output signaling track/hold hold-mode entry; used with DB5 to gate bus activity and prevent sampling corruption during critical acquisition phase. |
| ALFL | FIFO almost-full flag | Programmable interrupt output asserting when FIFO contains N valid words (N = 1–8 set via DB10–DB8)-enables deterministic DSP scheduling in real-time audio or control pipelines. |
| REF OUT | Internal reference output | 3 V Zener-derived reference with ±15 mV max error over full temperature range; requires series resistor for >50 pF capacitive loads to maintain stability. |
| VIN | Analog input | ±3 V differential input referenced to AGND; supports direct connection to op-amp buffers driving anti-alias filters in radar front-ends. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 8-word FIFO | Reduces DSP interrupt frequency by 8×, enabling efficient burst-read DMA transfers and minimizing software latency in servo loop closure. |
| Programmable ALFL threshold | Allows precise tuning of FIFO fill-level interrupt trigger (1–8 words) to match processor response time and pipeline depth in real-time systems. |
| BUSY-synchronized output disable | Writing '0' to DB5 prevents data bus activation during track→hold transition, eliminating sampling uncertainty caused by digital switching noise. |
| MIL-STD-883B Class B qualification | Validated for space and defense applications including burn-in, thermal cycling, and radiation tolerance per military screening requirements. |
| LC2MOS process technology | Combines bipolar precision (for track/hold and reference) with CMOS logic density and low power (60 mW typ), ensuring latch-up immunity in high-radiation environments. |
| Status/control register | Provides real-time visibility into FIFO empty/full state, overrun/overflow flags, and sample validity-enabling robust error recovery in unattended systems. |
Applications
| Radar Signal Digitization | DSP-Based Servo Control |
|---|---|
|
Use Scenario: Digitizing IF outputs from airborne radar receivers operating in pulsed-Doppler mode with strict jitter and SNR requirements. IC Role / Device Role / Timing Role: High-fidelity 12-bit ADC capturing 100 kHz sampled waveforms with 70 dB SNR and <57 ns access time for real-time FFT processing on ADSP-2100. Use Value: Eliminates external FIFO and reference components while maintaining MIL-qualified temperature range and radiation hardness for avionics deployment. |
Use Scenario: Closed-loop motor position feedback in missile actuation systems requiring deterministic sampling and fault-tolerant data integrity. IC Role / Device Role / Timing Role: Synchronized ADC providing ±3 V bipolar input capture with programmable ALFL interrupt to trigger PID computation before FIFO overflow. Use Value: Built-in FIFO and status register enable autonomous operation during processor interrupts, reducing risk of missed samples in safety-critical motion control. |
| Spectrum Analysis Instrumentation | Secure Voice Communication |
|
Use Scenario: Portable field-deployable RF spectrum analyzers needing wide dynamic range and low harmonic distortion across –55°C to +125°C. IC Role / Device Role / Timing Role: Precision ADC delivering –80 dB THD and 70 dB SNR at 10 kHz input, directly interfaced to TMS32020 for real-time windowed FFT execution. Use Value: On-chip 3 V reference and bipolar input eliminate calibration drift and external component count-critical for battery-powered, sealed enclosures. |
Use Scenario: Secure voice encryption modules in tactical radios where EMI resilience and temperature-stable conversion are mandatory. IC Role / Device Role / Timing Role: Low-noise 12-bit converter digitizing microphone preamp outputs with 70 dB SNR and FIFO buffering to decouple analog acquisition from crypto-processing latency. Use Value: LC2MOS process ensures latch-up immunity under ESD stress (4 kV HBM), and MIL-883B screening guarantees reliability in high-vibration battlefield environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7879SQ/883B | Same pinout and timing, but includes on-chip 2.5 V reference (not 3 V) and reduced SNR (68 dB) at 10 kHz. | Used where lower reference voltage simplifies signal chain gain staging but sacrifices dynamic range. | Select AD7879SQ/883B only if system-level reference voltage compatibility outweighs SNR requirement. |
| ADS8320UB/883 | 16-bit resolution, 100 kHz sampling, but no FIFO and 250 ns access time; requires external reference and separate track/hold. | Preferred for ultra-high-precision DC-coupled measurements where FIFO buffering is unnecessary and software-managed acquisition suffices. | Choose ADS8320UB/883 when resolution >12 bits is mandatory and system firmware can handle higher interrupt load. |
Compared with AD7878SQ/883B, AD7879SQ/883B trades 2 dB SNR and 3 V reference for 2.5 V compatibility, while ADS8320UB/883 delivers 4 extra bits at the cost of increased layout complexity, external support components, and loss of deterministic FIFO-based data flow control.
Availability
AD7878SQ/883B is available at Aetrix Electronics and suitable for radar front-ends, missile guidance subsystems, and secure communications equipment requiring stable component supply under extended temperature and radiation-hardened conditions.
Supply support for AD7878SQ/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 AD7878 is part of Analog Devices' legacy military-grade data acquisition portfolio, engineered specifically for high-reliability embedded systems demanding integrated signal conditioning, deterministic timing, and extreme environmental resilience.
FAQ
What is the qualified temperature range for AD7878SQ/883B?
The AD7878SQ/883B is specified for operation from –55°C to +125°C and undergoes full MIL-STD-883B Class B screening-including thermal cycling, burn-in, and radiation testing-to ensure reliability in aerospace and defense platforms. All dynamic and DC parameters are guaranteed across this full range.
Does AD7878SQ/883B require an external reference?
No. The AD7878SQ/883B integrates a trimmed 3 V Zener reference (REF OUT) with ±15 mV max error over –55°C to +125°C. External loading must be limited to ≤500 µA, and a series resistor is required for capacitive loads exceeding 50 pF to maintain stability-no external reference IC is needed for standard operation.
How does the FIFO in AD7878SQ/883B improve system-level timing determinism?
The 8-word FIFO in AD7878SQ/883B allows up to eight conversions to complete before the DSP must service the device, decoupling analog acquisition from processor interrupt latency. Combined with programmable ALFL and BUSY-synchronized output control, it enables predictable, jitter-free data flow essential for real-time servo and radar applications.
Can AD7878SQ/883B interface directly with TMS320C6713 DSPs?
Yes-AD7878SQ/883B is explicitly designed for compatibility with TI's TMS320 family, including TMS32010 and TMS32020. Its 57 ns data access time, DMRD/DMWR control mapping, and asynchronous CONVST support seamless integration with C6713 EMIF timing when configured for 8-MHz CLK IN and appropriate setup/hold margins.
What is the purpose of the DB5 (DISO) bit in the AD7878SQ/883B status/control register?
Writing '0' to DB5 (DISO) disables AD7878SQ/883B's three-state output drivers while BUSY is low-preventing digital switching noise from corrupting the track/hold amplifier's critical hold-phase acquisition. This feature is essential for maintaining sampling fidelity in high-EMI environments like avionics and radar systems.
AD7878SQ/883B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
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- 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:
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- Operating Temperature:
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- Supplier Device Package:
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- Mounting Type:
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- Grade:
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- Qualification:
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AD7878SQ/883B FAQ
1.How can I place an order for AD7878SQ/883B through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7878SQ/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 AD7878SQ/883B reliable?
The price and inventory of AD7878SQ/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7878SQ/883B is usually 5 days.
3.What payment methods are accepted for AD7878SQ/883B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7878SQ/883B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7878SQ/883B?
AD7878SQ/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7878SQ/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 AD7878SQ/883B?
For technical support, including AD7878SQ/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7878SQ/883B requirements.
6.How does Aetrix verify that AD7878SQ/883B is sourced from the original manufacturer or authorized distributors?
All AD7878SQ/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 AD7878SQ/883B meets industry standards.
7.What is the process for return or replacement of AD7878SQ/883B?
All AD7878SQ/883B units undergo pre-shipment inspection (PSI). If there is an issue with AD7878SQ/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 AD7878SQ/883B part is unused and in its original packaging.
Return procedure for AD7878SQ/883B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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