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Analog Devices Inc. AD678TD
- Part No.:
- AD678TD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD678TD.pdf
- Description:
- IC ADC 12BIT FLASH 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,327
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Product details
Overview
AD678TD 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 (K/B/T grades), 1 MHz full-power bandwidth, and ±5 V bipolar or 0–10 V unipolar input range. It is designed for precision measurement and signal processing in military-grade embedded systems operating from –55°C to +125°C.
For engineers reviewing the AD678TD datasheet, AD678TD pinout, AD678TD application, or AD678TD equivalent, this page provides verified technical context, validated pin functions, confirmed military-temperature DC/AC specifications, and real-world interface timing constraints - all specific to the AD678TD ceramic DIP variant with MIL-qualified AC+DC characterization.
Technical Context
The AD678TD 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 supports 1 µs input settling time and 150 ps aperture jitter, enabling accurate digitization of fast-slewing signals up to 500 kHz full-linear bandwidth.
It features dual digital interface modes: 12-bit parallel output via DB11–DB0 (12/8 = HIGH), or 8-bit multiplexed output with R/L and HBE control (12/8 = LOW). The internal 5 V reference (4.98–5.02 V) drives both unipolar (straight binary) and bipolar (twos complement) coding, with BIPOFF pin selecting mode via external resistor configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - defines smallest detectable voltage step: 2.44 mV (0–10 V range) or 2.44 mV (±5 V range). |
| Sampling Rate | 200 kSPS - supports real-time capture of signals up to 100 kHz Nyquist frequency without aliasing. |
| S/N+D Ratio | 72 dB (K/B/T grades) - ensures ≥11.6 effective bits for dynamic signal fidelity in FFT-based analysis. |
| Full-Power Bandwidth | 1 MHz - allows accurate digitization of full-scale sine waves up to 1 MHz before 3 dB amplitude loss. |
| Input Range | ±5 V bipolar or 0–10 V unipolar - matches standard sensor outputs and industrial transducer levels. |
| Supply Voltages | +12 V (VCC), –12 V (VEE), +5 V (VDD) - separates analog and digital power domains to minimize noise coupling. |
| Operating Temperature | –55°C to +125°C - qualified for aerospace, defense, and downhole instrumentation environments. |
Pinout & Package
AD678TD is housed in a 28-lead ceramic DIP (package option D-28), rated for hermetic sealing and thermal stability across –55°C to +125°C. Pin layout isolates analog (AGND, AIN, VCC, VEE, REFIN, REFOUT, BIPOFF) and digital (DGND, CS, SC, OE, EOCEN, SYNC, DBn, 12/8, R/L, HBE) sections to suppress crosstalk.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN | Analog Input | High-impedance (10 MΩ) node accepting ±5 V or 0–10 V signals directly-no external buffer required. |
| BIPOFF | Mode Configuration | Tied to AGND for unipolar mode (straight binary); tied to REFOUT via 50 Ω for bipolar mode (twos complement). |
| CS, SC, OE, EOCEN, SYNC, 12/8, R/L, HBE | Digital Control Inputs | TTL/CMOS-compatible; define conversion start, output enable, EOC gating, bus width (8/12-bit), and data alignment. |
| DB11–DB0 | Data Outputs | Three-state, parallel 12-bit outputs; in 8-bit mode, DB11–DB4 carry high/low byte under HBE/R/L control. |
| EOC | Status Output | Open-drain in asynchronous mode (requires 3 kΩ pull-up); three-state in synchronous mode-indicates conversion completion. |
| VCC, VEE, VDD, AGND, DGND | Power & Ground | Separate ±12 V analog and +5 V digital supplies with dedicated analog/digital ground pins prevent supply-induced INL/DNL errors. |
Key Features
| Feature | Design Value |
|---|---|
| Complete On-Chip Functionality | Integrates SHA, 12-bit ADC, 5 V reference, clock generator, and microprocessor bus interface-eliminates 12+ external components in discrete designs. |
| Military-Temperature DC+AC Specification | Fully tested INL (±0.7 LSB), DNL (±1 LSB), gain error (±6 LSB), and S/N+D (72 dB) across –55°C to +125°C-enables calibration-free deployment in harsh environments. |
| Dual Bus Interface Flexibility | Supports 16-bit systems (single 12-bit read) and 8-bit microcontrollers (two 8-bit reads with right/left justification)-reduces BOM count across product families. |
| Factory Laser Trimming | Eliminates need for external offset/gain trims in most applications; unipolar zero error ≤ ±2 LSB and gain error ≤ ±6 LSB at +25°C without user adjustment. |
| Low Aperture Uncertainty | 150 ps aperture jitter and 10 ns aperture delay ensure <0.025 LSB noise contribution at 100 kHz input-critical for phase-sensitive measurements. |
Applications
| Avionics Data Acquisition | Missile Guidance Sensor Interface |
|---|---|
|
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 (≤4.4 µs conversion time). Use Value: Guaranteed 12-bit linearity (INL ≤ ±0.7 LSB) and 72 dB S/N+D across –55°C to +125°C enables closed-loop stability without recalibration during mission profiles. |
Use Scenario: Conditioning analog outputs from inertial measurement units (IMUs) and seeker head detectors in tactical missile guidance electronics. IC Role / Device Role / Timing Role: High-fidelity analog front-end ADC with 1 MHz full-power bandwidth supporting RF-modulated IF signal sampling in seeker processors. Use Value: 10 MΩ input impedance allows direct connection to high-Z sensors; bipolar ±5 V range matches differential transducer outputs without level-shifting circuitry. |
| Downhole Oilfield Instrumentation | Ruggedized Industrial Process Monitoring |
|
Use Scenario: Measuring temperature, pressure, and flow sensor signals in borehole logging tools exposed to >125°C ambient and mechanical shock. IC Role / Device Role / Timing Role: Radiation-tolerant, hermetically sealed ADC performing precision DC-coupled measurements with factory-trimmed offset/gain stability over temperature. Use Value: MIL-STD-883-compliant screening and –55°C to +125°C operation ensure 10+ year field reliability without drift-induced measurement drift in unattended deployments. |
Use Scenario: Digitizing 4–20 mA loop outputs, thermocouple voltages, and strain gauge bridges in explosion-proof PLC I/O modules deployed in refineries and chemical plants. IC Role / Device Role / Timing Role: Isolated analog input conditioner providing galvanically separated, high-accuracy digitization with programmable unipolar/bipolar range selection. Use Value: Dual-mode interface (8-/12-bit) simplifies firmware reuse across legacy 8-bit controllers and modern 32-bit RTUs-reducing qualification effort across product generations. |
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 |
|---|---|---|---|
| AD678BD | Same die, ceramic DIP package, but rated –40°C to +85°C; DC specs identical, but not qualified for extended military temperature range. | Suitable for industrial control cabinets or avionics line-replaceable units where ambient stays within –40°C to +85°C. | Select AD678BD only if full –55°C to +125°C operation is unnecessary-reduces cost while retaining identical AC/DC performance at lower temperature extremes. |
| AD679BD | 14-bit, 128 kSPS successor with identical pinout; higher resolution but slower throughput and no MIL-STD-883C Class B screening for AD678TD's temperature grade. | Used when 14-bit resolution is mandatory and 128 kSPS suffices-e.g., high-precision test equipment requiring <0.02% measurement uncertainty. | Choose AD678TD over AD679BD when 200 kSPS speed, guaranteed military-temperature DC accuracy, or proven field reliability in downhole/avionics roles is prioritized over raw bit depth. |
Compared with AD678BD and AD679BD, the AD678TD uniquely combines 200 kSPS speed, 12-bit military-temperature DC+AC specification, and hermetic ceramic DIP packaging-making it the only option qualified for continuous operation at –55°C in sealed, high-vibration environments without derating.
Availability
AD678TD is available at Aetrix Electronics and suitable for avionics data acquisition, missile guidance sensor interface, and downhole oilfield instrumentation requiring stable component supply under extended temperature stress and long lifecycle commitments.
Supply support for AD678TD 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 engineered for high-accuracy, wide-bandwidth sampling in mission-critical military, aerospace, and industrial measurement systems-emphasizing on-chip integration, factory-trimmed DC precision, and ruggedized packaging.
FAQ
What is the operating temperature range certified for the AD678TD?
The AD678TD is fully specified and screened for operation from –55°C to +125°C, with DC parameters (INL, DNL, gain/offset error) and AC performance (S/N+D, THD) tested across this full range. This qualifies it for deployment in downhole tools, missile seekers, and avionics black boxes where ambient extremes exceed commercial or industrial grade limits. The AD678TD meets MIL-STD-883 requirements for temperature cycling and long-term stability under thermal stress.
Does the AD678TD require external clock circuitry?
No, the AD678TD includes fully integrated clock generation circuitry and requires no external crystal or oscillator. Its internal clock supports the rated 200 kSPS sampling rate without additional components. External timing control is limited to Start Convert (SC) and SYNC signals for synchronization with host systems; the AD678TD generates its own conversion timing internally, reducing board space and improving jitter immunity compared to externally clocked ADCs.
How does the AD678TD handle bipolar versus unipolar input ranges?
The AD678TD selects input range via the BIPOFF pin: tying BIPOFF to AGND configures ±5 V bipolar input with twos complement output coding; tying BIPOFF to REFOUT through a 50 Ω resistor configures 0–10 V unipolar input with straight binary coding. Both modes use the same 12-bit resolution (2.44 mV step size), and the internal 5 V reference (4.98–5.02 V) ensures consistent full-scale accuracy without external trimming in either configuration.
Can the AD678TD interface directly with an 8-bit microcontroller bus?
Yes, the AD678TD supports 8-bit multiplexed interface via the 12/8 pin (set LOW), using DB11–DB4 for data transfer and HBE/R/L pins to control high/low byte sequencing and right/left justification. In this mode, two consecutive 8-bit reads retrieve the full 12-bit result-enabling seamless integration with legacy 8-bit MCUs like Intel 8051 or Zilog Z8 without glue logic or FIFO buffers.
What power supply decoupling is recommended for the AD678TD?
Analog Devices specifies 10 µF tantalum + 0.1 µF ceramic capacitors placed as close as possible to each power pin (VCC, VEE, VDD), with direct low-inductance connections to their respective ground pins (AGND for VCC/VEE, DGND for VDD). Power traces must be short and wide; switching supplies are prohibited. This decoupling scheme suppresses supply-induced noise that would otherwise degrade the AD678TD's 72 dB S/N+D ratio and ±0.7 LSB INL performance.
AD678TD 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:
- -55°C ~ 125°C
- Supplier Device Package:
- 28-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD678TD FAQ
1.How can I place an order for AD678TD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD678TD 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 AD678TD reliable?
The price and inventory of AD678TD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD678TD is usually 5 days.
3.What payment methods are accepted for AD678TD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD678TD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD678TD?
AD678TD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD678TD 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 AD678TD?
For technical support, including AD678TD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD678TD requirements.
6.How does Aetrix verify that AD678TD is sourced from the original manufacturer or authorized distributors?
All AD678TD 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 AD678TD meets industry standards.
7.What is the process for return or replacement of AD678TD?
All AD678TD units undergo pre-shipment inspection (PSI). If there is an issue with AD678TD, 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 AD678TD part is unused and in its original packaging.
Return procedure for AD678TD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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