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Analog Devices Inc. AD679TD/883B
- Part No.:
- AD679TD/883B
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
AD679TD/883B.pdf
- Description:
- IC ADC 14BIT 128KSPS 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,335
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Product details
Overview
AD679TD/883B from Analog Devices is a 14-bit, 128 kSPS monolithic sampling ADC with integrated sample-and-hold amplifier, on-chip 5 V reference, clock generator, and 8-bit bus interface. It delivers 78 dB S/N+D (T grade), 1 MHz full-power bandwidth, and 10 MΩ input impedance, enabling direct connection to high-impedance sources in precision test instrumentation and military-grade data acquisition systems.
For engineers reviewing the AD679TD/883B datasheet, AD679TD/883B pinout, AD679TD/883B application, or AD679TD/883B equivalent, key selection factors include MIL-STD-883B compliance, –55°C to +125°C operation, bipolar/unipolar mode support, two-read 14-bit output timing, and compatibility with legacy AD678-based designs requiring upgrade to 14-bit resolution without PCB changes.
Technical Context
The AD679TD/883B implements a recursive subranging architecture with flash converter circuitry and error correction to achieve 14-bit accuracy at 128 kSPS. Its BiMOS process integrates high-precision bipolar analog front-end with low-power CMOS logic and laser-trimmed thin-film resistors for stable DC performance.
It supports both synchronous (CS-gated) and asynchronous (CS-independent) conversion control via the SYNC pin, with EOC signaling either as three-state (synchronous) or open-drain (asynchronous). Input range is configurable for 0–10 V unipolar or ±5 V bipolar operation using the BIPOFF pin, and data is output left-justified in straight binary or twos complement format across DB7–DB0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees 1 LSB = 0.61 mV for 10 V full-scale range, enabling sub-millivolt measurement fidelity. |
| Sampling Rate | 128 kSPS - supports real-time capture of signals up to 500 kHz linear bandwidth without aliasing degradation. |
| S/N+D Ratio | 78 dB (min, T grade) - ensures ≥12.7 effective bits for dynamic signal analysis in radar and comms test equipment. |
| Input Impedance | 10 MΩ - allows direct interface to unbuffered sensors, multiplexers, or high-Z sources without loading-induced gain error. |
| Supply Voltages | +12 V (VCC), –12 V (VEE), +5 V (VDD) - dual-rail analog supplies enable true bipolar input handling and rail-to-rail dynamic range. |
| Operating Temperature | –55°C to +125°C - qualified per MIL-STD-883B, suitable for avionics, missile guidance, and space-qualified telemetry systems. |
| Integral Nonlinearity | ±2.5 LSB (max, T grade) - limits code-dependent measurement uncertainty to <0.015% FSR in calibration-critical metrology. |
| Full-Power Bandwidth | 1 MHz - permits undersampling of IF signals in software-defined radio receivers while maintaining amplitude integrity. |
Pinout & Package
AD679TD/883B is supplied in a 28-lead ceramic DIP (package code D-28), hermetically sealed and screened to MIL-STD-883B requirements for enhanced reliability in harsh environments.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| AIN (6) | Analog Signal Input | High-impedance (10 MΩ) node accepting ±5 V bipolar or 0–10 V unipolar inputs; requires no external buffer for most sensor/mux interfaces. |
| BIPOFF (10) | Bipolar Offset Control | Configures coding mode: tied to AGND for unipolar/straight binary; tied to REFOUT for bipolar/twos complement operation. |
| SC (3) | Start Convert Input | Active-low trigger initiating conversion; must be pulsed (not held low) to avoid accuracy degradation per datasheet warning. |
| EOC (27) | End-of-Convert Output | Open-drain in asynchronous mode (requires 3 kΩ pull-up); three-state in synchronous mode; signals completion of 6.3 µs conversion. |
| HBE (15) | High Byte Enable | Selects DB7–DB0 output content: LOW = high byte (bits 13–6); HIGH = low byte (bits 5–0), enabling 14-bit read over 8-bit bus. |
| VCC (11), VEE (5), VDD (28) | Analog/Digital Power | +12 V/–12 V analog rails provide headroom for ±5 V input; +5 V digital rail powers TTL/CMOS-compatible I/O and internal logic. |
Key Features
| Feature | Design Value |
|---|---|
| Complete Integration | On-chip SHA, reference, clock, and bus interface eliminate 12+ external components versus discrete ADC solutions, reducing layout complexity and board area. |
| MIL-STD-883B Compliance | Screened per Method 5005 for burn-in, temperature cycling, and mechanical shock-ensuring long-term stability in defense/aerospace deployments. |
| Factory Laser Trimming | Eliminates need for user calibration or external trim pots in most applications; achieves ±0.07% FSR zero/gain error without field adjustment. |
| Pin Compatibility with AD678 | Direct drop-in replacement for 12-bit AD678 in existing 28-pin DIP layouts, enabling resolution upgrade without redesign or requalification. |
| Two-Read 14-Bit Interface | Left-justified 14-bit output delivered as 8-bit high byte + 6-bit low byte over standard 8-bit microprocessor buses, simplifying firmware integration. |
Applications
| Test & Measurement Instrumentation | Military Data Acquisition Systems |
|---|---|
|
Use Scenario: High-accuracy voltage logging in automated test equipment (ATE) capturing transient waveforms from RF power amplifiers. IC Role / Device Role / Timing Role: Primary sampling ADC performing synchronized 128 kSPS digitization with 1 MHz full-power bandwidth and 78 dB S/N+D. Use Value: 14-bit resolution and factory-trimmed INL (±2.5 LSB) ensure traceable calibration against NIST standards without per-unit trimming. |
Use Scenario: Real-time sensor fusion in airborne inertial navigation units operating across –55°C to +125°C thermal extremes. IC Role / Device Role / Timing Role: Ruggedized ADC acquiring gyro and accelerometer outputs with MIL-STD-883B screening and dual-supply noise immunity. Use Value: Hermetic ceramic DIP package and –55°C/+125°C qualification guarantee uninterrupted operation during missile launch and re-entry thermal cycles. |
| Radar Signal Processing Front-End | Avionics Health Monitoring |
|
Use Scenario: Digitizing intermediate frequency (IF) signals in ground-based radar receivers where undersampling of >1 MHz signals is required. IC Role / Device Role / Timing Role: Sampling ADC leveraging 1 MHz full-power bandwidth and 500 kHz full-linear bandwidth for clean IF capture. Use Value: Recursive subranging architecture maintains 78 dB S/N+D even at Nyquist-limited frequencies, preserving target detection SNR. |
Use Scenario: Continuous monitoring of engine vibration, oil pressure, and temperature in commercial aircraft flight control computers. IC Role / Device Role / Timing Role: Precision ADC interfacing with piezoelectric sensors and RTDs, supporting bipolar/unipolar modes via BIPOFF pin. Use Value: 10 MΩ input impedance enables direct connection to unbuffered transducers, eliminating op-amp stages and associated drift/error sources. |
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 |
|---|---|---|---|
| AD679BD | Same die, ceramic DIP package, but rated –40°C to +85°C (B grade) and screened to commercial MIL-STD-883 levels-not full 883B. | Lacks extended temperature range and full military screening; unsuitable for space or high-reliability defense platforms. | Select AD679BD only for industrial or non-safety-critical aerospace applications where cost is prioritized over full MIL-STD-883B compliance. |
| ADS8505IDBT | 16-bit, 250 kSPS SAR ADC with internal reference; requires external clock; no integrated SHA; operates from single +5 V supply. | Higher resolution but lacks on-chip SHA and dual-supply flexibility; not pin-compatible; different timing interface (no HBE/EOCEN). | Choose ADS8505IDBT when 16-bit accuracy and lower power (120 mW) outweigh need for integrated signal conditioning and MIL-STD-883B qualification. |
Compared with AD679BD and ADS8505IDBT, AD679TD/883B uniquely combines MIL-STD-883B screening, –55°C to +125°C operation, integrated SHA/reference/clock, and AD678 pin compatibility-making it irreplaceable in legacy-maintained, high-reliability military systems requiring guaranteed long-term supply and qualification continuity.
Availability
AD679TD/883B is available at Aetrix Electronics and suitable for test instrumentation, avionics health monitoring, and radar signal processing requiring stable component supply under extended temperature and radiation-tolerant conditions.
Supply support for AD679TD/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 DSP ICs, serving precision instrumentation, aerospace, and industrial markets since 1965.
The AD679 product line was designed specifically for high-accuracy, high-speed data acquisition in military and space-constrained environments where integration, reliability, and extended temperature operation are mandatory.
FAQ
What is the operating temperature range of the AD679TD/883B?
The AD679TD/883B is specified for operation from –55°C to +125°C and is fully screened per MIL-STD-883B, including temperature cycling and burn-in tests. This range is validated for all AC and DC parameters in the T-grade specification, making AD679TD/883B suitable for deployment in missile guidance systems, satellite telemetry, and downhole oilfield tools where ambient extremes are routine.
Does the AD679TD/883B require external calibration components?
No-AD679TD/883B is factory laser-trimmed for offset, gain, and linearity, achieving ±0.07% FSR zero/gain error and ±2.5 LSB INL without external trims. Only a 50 Ω 1% resistor is needed in unipolar mode if fine calibration is required; bipolar mode may use two such resistors. The AD679TD/883B datasheet confirms that full-rated performance is attained with no user calibration in typical applications.
How does the AD679TD/883B handle bipolar versus unipolar input ranges?
The AD679TD/883B selects input mode via the BIPOFF pin: tie to AGND for 0–10 V unipolar input with straight binary output; tie to REFOUT for ±5 V bipolar input with twos complement output. Internal circuitry scales the 10 V reference accordingly, and the 14-bit result remains left-justified across DB7–DB0 in both modes-enabling seamless firmware reuse across measurement configurations.
Is the AD679TD/883B pin-compatible with the AD678 ADC?
Yes-the AD679TD/883B uses identical 28-lead ceramic DIP pinout and electrical interface as the AD678, allowing direct replacement in legacy designs. Both share identical SC, EOC, OE, CS, and DBx signal definitions, and the AD679TD/883B's higher resolution and improved S/N+D do not alter timing or layout constraints, enabling resolution upgrades without PCB revision.
What power supplies does the AD679TD/883B require, and why are three rails necessary?
The AD679TD/883B requires +12 V (VCC), –12 V (VEE), and +5 V (VDD) supplies. The dual analog rails support true bipolar input operation (±5 V) and maximize dynamic range for the internal SHA and comparator stages, while the +5 V digital rail powers TTL/CMOS-compatible I/O and logic. This separation prevents digital switching noise from modulating analog performance-a critical requirement for 14-bit accuracy in MIL-STD-883B applications.
AD679TD/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:
- -
- 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:
- -
AD679TD/883B FAQ
1.How can I place an order for AD679TD/883B through Aetrix?
Please submit a Request for Quotation (RFQ) for AD679TD/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 AD679TD/883B reliable?
The price and inventory of AD679TD/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD679TD/883B is usually 5 days.
3.What payment methods are accepted for AD679TD/883B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD679TD/883B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD679TD/883B?
AD679TD/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD679TD/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 AD679TD/883B?
For technical support, including AD679TD/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD679TD/883B requirements.
6.How does Aetrix verify that AD679TD/883B is sourced from the original manufacturer or authorized distributors?
All AD679TD/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 AD679TD/883B meets industry standards.
7.What is the process for return or replacement of AD679TD/883B?
All AD679TD/883B units undergo pre-shipment inspection (PSI). If there is an issue with AD679TD/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 AD679TD/883B part is unused and in its original packaging.
Return procedure for AD679TD/883B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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