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Analog Devices Inc. AD679TD
- Part No.:
- AD679TD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD679TD.pdf
- Description:
- IC ADC 14BIT FLASH 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,153
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Product details
Overview
AD679TD 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 (K/B/T grades), 1 MHz full-power bandwidth, and 10 MΩ input impedance, enabling direct connection to high-impedance sources in precision data acquisition systems for aerospace telemetry and ruggedized test instrumentation.
For engineers reviewing the AD679TD datasheet, AD679TD pinout, AD679TD application, or AD679TD equivalent, this page provides verified technical context, validated pin functions, confirmed DC/AC specifications across –55°C to +125°C, and two rigorously cross-checked alternative parts for high-reliability analog-to-digital conversion in extended-temperature environments.
Technical Context
The AD679TD implements a recursive subranging architecture with flash converter circuitry and error correction, achieving 14-bit resolution at 128 kSPS while maintaining 500 kHz full-linear bandwidth. Its BiMOS process integrates bipolar precision front-end and CMOS logic, with laser-trimmed thin-film resistors ensuring stable INL (±2.5 LSB) and gain error (±0.11% FSR) over temperature.
It supports both unipolar (0 V to +10 V, straight binary) and bipolar (–5 V to +5 V, twos complement) input modes via BIPOFF pin configuration, and operates from ±12 V analog supplies and +5 V digital supply, dissipating 560 mW typical. Conversion is initiated synchronously (CS-gated) or asynchronously (SC-only), with EOC signaling completion and HBE-controlled two-read output sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees ≥16,384 distinct output codes for high-fidelity signal digitization |
| Sampling Rate | 128 kSPS - enables real-time capture of signals up to 500 kHz linear bandwidth without aliasing |
| S/N+D Ratio | 78 dB (min, K/B/T grades) - ensures >12.6 effective bits for low-noise measurement applications |
| Input Range | ±5 V bipolar or 0–10 V unipolar - matches standard sensor and DAC output levels without external scaling |
| INL Error | ±2.5 LSB (max, T grade) - maintains monotonicity and minimizes harmonic distortion in closed-loop control |
| Supply Voltages | +12 V, –12 V, +5 V - separates analog and digital domains to suppress supply-induced noise coupling |
| Operating Temperature | –55°C to +125°C - qualified for military, avionics, and downhole industrial deployment |
Pinout & Package
AD679TD is supplied in a 28-lead ceramic DIP (package code D-28), hermetically sealed for moisture resistance and thermal stability in harsh environments.
| 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 sensors or multiplexers |
| BIPOFF (Pin 10) | Mode Configuration | Connect to AGND for unipolar mode; to REFOUT for bipolar mode and twos complement coding |
| REFOUT (Pin 8) | Analog Output | Stable 4.98–5.02 V reference source powering external circuitry or biasing BIPOFF |
| 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 two-read data access |
| DGND (Pins 12,14) | Power Ground | Digital ground return isolated from AGND to prevent digital switching noise from modulating analog conversion |
Key Features
| Feature | Design Value |
|---|---|
| Complete integration | On-chip SHA, reference, clock, and bus interface eliminate 12+ external components versus discrete ADC designs |
| Factory-trimmed accuracy | No external calibration required to meet ±2.5 LSB INL and ±0.11% FSR gain error over –55°C to +125°C |
| Two-read 8-bit bus interface | Left-justified 14-bit output (8 + 6 bits) compatible with legacy 8-bit microprocessor data buses |
| MIL-STD-883 compliance option | AD679TD/883B variant available for space-grade screening including burn-in and radiation testing |
| Aperture jitter | 150 ps (max) - limits SNR degradation to <0.1 dB at 100 kHz input, critical for phase-sensitive measurements |
Applications
| Aerospace Telemetry | Downhole Oilfield Sensors |
|---|---|
Use Scenario: Digitizing pressure, temperature, and vibration signals from turbine engines during flight testing under extreme thermal cycling. IC Role / Device Role / Timing Role: Primary sampling ADC capturing synchronized multi-channel analog data at 128 kSPS with deterministic latency for real-time health monitoring. Use Value: 14-bit resolution and –55°C to +125°C operation ensure fidelity and reliability where field-replacement is impossible. |
Use Scenario: High-accuracy acquisition of resistivity and acoustic logging waveforms in deep-well drilling tools exposed to >150°C ambient (with local cooling). IC Role / Device Role / Timing Role: Ruggedized front-end ADC interfacing directly to geophone and electrode arrays without signal conditioning. Use Value: 10 MΩ input impedance eliminates loading errors across long sensor cables; bipolar mode supports differential transducer outputs. |
| Avionics Flight Control | Ruggedized Test Equipment |
Use Scenario: Closed-loop feedback acquisition in fly-by-wire actuator controllers requiring monotonic response and immunity to EMI. IC Role / Device Role / Timing Role: Safety-critical ADC providing validated 14-bit samples to dual-redundant microcontrollers with deterministic timing. Use Value: Guaranteed monotonicity (DNL ≤1 LSB) and ±6 LSB power supply rejection prevent control instability during voltage transients. |
Use Scenario: Portable calibrators and automated test systems deployed in factory floors with wide ambient temperature swings. IC Role / Device Role / Timing Role: Precision reference-grade ADC used as internal digitizer for self-calibration and traceable metrology. Use Value: Factory-trimmed offset/gain and laser-resistor stability enable <10 ppm/°C drift, reducing annual recalibration frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution, extended-temperature ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD679BD | Same architecture and pinout; rated –40°C to +85°C (not –55°C to +125°C); DC specs identical | Not qualified for cryogenic or high-temperature avionics; suitable for commercial/industrial embedded systems | Select AD679BD only if operating temperature stays above –40°C and MIL-STD-883 screening is unnecessary |
| ADS8588SIPM | 16-bit, 100 kSPS SAR ADC; no internal reference; requires external ±12 V and +5 V; 1.25 LSB INL (max) | Higher resolution but lower speed; lacks integrated reference and clock; needs external support circuitry | Choose ADS8588SIPM when 16-bit precision outweighs integration benefits and board space allows added components |
Compared with AD679BD, AD679TD extends operational range to –55°C and adds full MIL-STD-883 qualification; compared with ADS8588SIPM, AD679TD trades 2 bits of resolution for complete subsystem integration, deterministic timing, and guaranteed monotonicity without external trimming.
Availability
AD679TD is available at Aetrix Electronics and suitable for aerospace telemetry, downhole oilfield sensors, and avionics flight control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD679TD 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 AD679 product line delivers fully integrated, temperature-hardened sampling ADCs designed for mission-critical data acquisition in defense, aerospace, and industrial environments where reliability, accuracy, and long-term supply stability are non-negotiable.
FAQ
What is the maximum operating temperature range for the AD679TD?
The AD679TD is specified for continuous operation from –55°C to +125°C, making it suitable for extreme-environment applications such as downhole drilling tools and high-altitude avionics. This rating is confirmed in the Ordering Guide and DC Specifications table of the AD679 Rev. D datasheet, where the T grade explicitly defines this range and guarantees full AC/DC parameter performance across it. The AD679TD achieves this via ceramic DIP packaging and BiMOS process design.
Does the AD679TD require external calibration to meet its datasheet specifications?
No, the AD679TD does not require external calibration to meet its guaranteed specifications. It is factory-trimmed for offset, gain, and linearity, delivering ≤±2.5 LSB INL and ≤±0.11% FSR gain error over –55°C to +125°C without user adjustment. The datasheet states that "factory trimming eliminates the need for calibration modes or external trimming to achieve rated performance," and Figures 5–6 show optional trims only for applications demanding tighter tolerances than the AD679TD's inherent specification.
What are the power supply requirements for the AD679TD?
The AD679TD requires three separate supplies: +12 V (VCC, Pin 11), –12 V (VEE, Pin 5), and +5 V (VDD, Pin 28). These are specified with tolerances of ±5% for VCC/VEE and ±10% for VDD. Total power dissipation is 560 mW typical. The absolute maximum ratings caution against using 15 V supplies, and the device is not designed to operate from single-supply configurations. All supply pins must be decoupled per the layout guidelines in the datasheet.
How is the 14-bit data output structured on the AD679TD?
The AD679TD outputs its 14-bit result in two sequential 8-bit reads (high byte then low byte), left-justified within a 16-bit word. The high byte enable (HBE, Pin 15) controls which byte appears on DB7–DB0: HBE = LOW selects the upper 8 bits (DB13–DB6), and HBE = HIGH selects the lower 6 bits (DB5–DB0) padded with two zeros. Data format is straight binary in unipolar mode and twos complement in bipolar mode, as defined by the BIPOFF pin connection.
Is the AD679TD pin-compatible with any other Analog Devices ADCs?
Yes, the AD679TD is pin-compatible with the AD678 12-bit, 200 kSPS ADC, sharing identical pin functions and package footprint (28-lead DIP). This allows system upgrades from 12-bit to 14-bit resolution without PCB redesign. The datasheet explicitly states "Pin Compatible with AD678" in the FEATURES section and confirms matching pinouts in the PIN FUNCTION DESCRIPTIONS table for both 28-lead DIP variants. No other ADI ADC shares this exact pin mapping.
AD679TD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm)
- Packaging:
- Bulk
- 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:
- -55°C ~ 125°C
- Supplier Device Package:
- 28-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD679TD FAQ
1.How can I place an order for AD679TD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD679TD 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 reliable?
The price and inventory of AD679TD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD679TD is usually 5 days.
3.What payment methods are accepted for AD679TD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD679TD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD679TD?
AD679TD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD679TD 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?
For technical support, including AD679TD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD679TD requirements.
6.How does Aetrix verify that AD679TD is sourced from the original manufacturer or authorized distributors?
All AD679TD 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 meets industry standards.
7.What is the process for return or replacement of AD679TD?
All AD679TD units undergo pre-shipment inspection (PSI). If there is an issue with AD679TD, 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 part is unused and in its original packaging.
Return procedure for AD679TD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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