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Analog Devices Inc. AD1674TD
- Part No.:
- AD1674TD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD1674TD.pdf
- Description:
- IC ADC 12BIT SAR 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,298
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Product details
Overview
AD1674TD from Analog Devices is a complete monolithic 12-bit, 100 kSPS analog-to-digital converter with integrated sample-and-hold amplifier (SHA), on-chip 10 V reference, and three-state parallel digital interface. It supports unipolar (0 V–10 V, 0 V–20 V) and bipolar (±5 V, ±10 V) input ranges, operates on ±12 V/±15 V analog and +5 V logic supplies, and delivers ±1 LSB integral nonlinearity at –55°C to +125°C. It is used in high-reliability military data acquisition systems requiring stable DC accuracy and AC performance under extreme temperature.
For engineers reviewing the AD1674TD datasheet, AD1674TD pinout, AD1674TD application, or AD1674TD equivalent, this page provides verified technical context, exact pin functions, real-world timing behavior in stand-alone and full-control modes, confirmed military-grade thermal specifications, and validated drop-in alternatives for ruggedized measurement systems.
Technical Context
The AD1674TD implements a successive approximation register (SAR) architecture with an integrated SHA that supports full Nyquist bandwidth operation up to 1 MHz and achieves 70 dB S/(N+D) ratio at 10 kHz. Its BiMOS II process integrates precision laser-trimmed scaling resistors enabling four calibrated input ranges without external components.
It features dual-mode digital interface: full-control mode using CE/CS/R/C/A0/12/8 signals for multiplexed bus systems, and stand-alone mode where R/C edge-triggering simplifies timing and reduces aperture jitter to 250 ps. Conversion time is fixed at 9–10 µs for 12-bit cycles across its –55°C to +125°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees 4096 distinct output codes with no missing codes over full temperature range. |
| Sampling Rate | 100 kSPS - enables real-time capture of signals up to 500 kHz full-linear bandwidth with <–0.1 dB amplitude error. |
| INL / DNL | ±1 LSB / No Missing Codes - ensures monotonicity and end-point linearity critical for closed-loop control feedback. |
| Input Ranges | ±5 V, ±10 V, 0–10 V, 0–20 V - selectable via BIP OFF and input pin routing; no external scaling required. |
| S/(N+D) Ratio | 70 dB @ 10 kHz - measured with coherent FFT; supports accurate spectral analysis in signal intelligence receivers. |
| Operating Temp | –55°C to +125°C - qualified per MIL-STD-883; suitable for avionics, engine control, and downhole instrumentation. |
| Power Supplies | +5 V (VLOGIC), ±12 V or ±15 V (VCC/VEE) - separate analog/digital grounds (AGND/DGND) minimize noise coupling. |
| Conversion Time | 9–10 µs (12-bit) - deterministic timing enables precise synchronization in time-of-flight or phase-sensitive measurements. |
Pinout & Package
AD1674TD is supplied in a 28-lead hermetically sealed ceramic DIP (package code D-28), rated for extended military temperature operation and compatible with wave soldering per MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Power supply input | +5 V logic rail; powers internal CMOS logic and output buffers; must be decoupled locally. |
| 12/8 (Pin 2) | Digital input | Selects 12-bit parallel (HIGH) or two 8-bit nibbles (LOW); determines data organization for microprocessor interface. |
| CS (Pin 3) | Digital input | Active-low chip select; enables conversion or read when CE is HIGH and R/C state defines operation mode. |
| A0 (Pin 4) | Digital input | Selects 12-bit (LOW) vs. 8-bit (HIGH) conversion cycle; during read, selects MSB or LSB byte output enable. |
| R/C (Pin 5) | Digital input | Read/Convert control: LOW initiates conversion in full-control mode; falling edge triggers conversion in stand-alone mode. |
| CE (Pin 6) | Digital input | Active-high chip enable; initiates operation when CS is LOW and R/C defines function; synchronizes internal timing. |
| VCC (Pin 7) | Power supply input | +12 V or +15 V analog supply; powers SHA, DAC, and comparator; requires low-noise filtering. |
| REF OUT (Pin 8) | Analog output | +10 V reference source; drives BIP OFF via 50 Ω for bipolar offset calibration; max 2 mA load. |
| AGND (Pin 9) | Analog ground | Analog reference common; must be isolated from DGND except at single-point star ground to prevent noise injection. |
| REF IN (Pin 10) | Analog input | Reference input node; connected to REF OUT via 50 Ω resistor for internal reference use; sets full-scale gain. |
| VEE (Pin 11) | Power supply input | –12 V or –15 V analog supply; powers negative-side circuitry including SHA and comparator; matched to VCC. |
| BIP OFF (Pin 12) | Analog input | Bipolar offset adjustment node; tied to REF OUT via 50 Ω for ±5 V/±10 V operation; grounded for unipolar mode. |
| 10 VIN (Pin 13) | Analog input | 10 V span input: accepts 0–10 V (unipolar) or ±5 V (bipolar); unused in 20 V span configuration. |
| 20 VIN (Pin 14) | Analog input | 20 V span input: accepts 0–20 V (unipolar) or ±10 V (bipolar); unused in 10 V span configuration. |
| DGND (Pin 15) | Digital ground | Digital reference common; connects to system logic ground; separated from AGND to avoid digital switching noise. |
| DB0–DB3 (Pins 16–19) | Digital output | LSB nibble (bits 0–3); enabled only when A0 = HIGH and 12/8 = LOW; outputs 0000 when A0 = LOW. |
| DB4–DB7 (Pins 20–23) | Digital output | Middle nibble (bits 4–7); always active in 12-bit mode; outputs 0000 when A0 = HIGH and 12/8 = LOW. |
| DB8–DB11 (Pins 24–27) | Digital output | MSB nibble (bits 8–11); enabled when A0 = LOW (12-bit or 8-bit MSB read); high-impedance when A0 = HIGH. |
| STS (Pin 28) | Digital output | Status flag: HIGH during conversion; falls LOW 0.6–1.2 µs after data valid; used for interrupt-driven read timing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Sample-and-Hold Amplifier | Supports full Nyquist bandwidth (1 MHz) with <1 µs acquisition time; eliminates need for external SHA and associated layout complexity. |
| Four Calibrated Input Ranges | Factory-laser-trimmed resistors enable ±5 V, ±10 V, 0–10 V, and 0–20 V operation without external scaling or recalibration. |
| DC + AC Performance Guaranteed | Specified for both dc parameters (offset, full-scale error) and ac metrics (70 dB S/(N+D), –90 dB THD) across full military temperature range. |
| Flexible Microprocessor Interface | Three-state output buffers support direct connection to 8-bit or 16-bit buses; 12/8 and A0 pins configure data width and byte ordering. |
| MIL-STD-883 Qualified | Screened and tested per MIL-STD-883 Method 5005 for hermeticity, thermal shock, and long-term reliability in harsh environments. |
| Stand-Alone Mode Timing Control | R/C edge-triggered conversion reduces aperture jitter to 250 ps; improves dynamic performance versus software-controlled full-control mode. |
Applications
| Avionics Flight Data Recorder | Tactical Radar Signal Digitization |
|---|---|
|
Use Scenario: Capturing synchronized analog sensor data (accelerometers, gyros, pressure transducers) in airborne platforms exposed to –55°C to +125°C thermal cycling. IC Role / Device Role / Timing Role: Primary ADC performing 100 kSPS sampling with deterministic 9–10 µs conversion latency; STS flag triggers DMA read to reduce CPU overhead. Use Value: ±1 LSB INL and guaranteed 70 dB S/(N+D) ensure accurate reconstruction of vibration spectra and fault signatures across full temperature envelope. |
Use Scenario: Digitizing intermediate frequency (IF) outputs from radar receiver chains in ground-mobile electronic warfare systems. IC Role / Device Role / Timing Role: Stand-alone mode R/C edge-triggered acquisition minimizes aperture jitter (250 ps), preserving phase coherence for pulse-Doppler processing. Use Value: Full-linear bandwidth of 500 kHz and –90 dB second-order IMD enable clean capture of closely spaced RF tones without intermodulation artifacts. |
| Engine Control Unit (ECU) Sensor Hub | Downhole Oilfield Telemetry |
|
Use Scenario: Consolidating multiple analog inputs (exhaust gas O₂, knock detection, throttle position) in diesel engine ECUs operating near hot exhaust manifolds. IC Role / Device Role / Timing Role: Unipolar 0–10 V and bipolar ±5 V ranges accommodate diverse sensor outputs; BIP OFF pin simplifies field calibration. Use Value: On-chip 10 V reference and laser-trimmed scaling resistors eliminate external voltage references and trimming potentiometers, reducing BOM count and failure points. |
Use Scenario: High-temperature logging while drilling (HT/LWD) tools deployed at >150°C wellbore temperatures with limited power and space. IC Role / Device Role / Timing Role: Hermetic ceramic DIP package (D-28) withstands thermal shock and hydrogen embrittlement; operates reliably at –55°C startup and +125°C steady-state. Use Value: 385–575 mW power dissipation and ±12 V supply compatibility allow integration into compact, battery-powered telemetry modules with minimal thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD1674BD | Same architecture and pinout; –40°C to +85°C grade; ±1/2 LSB INL (tighter than AD1674TD's ±1 LSB). | Industrial control, test equipment - lacks extended low-temp capability and MIL-STD-883 screening. | Select AD1674BD when cost sensitivity outweighs military temp range and hermetic packaging requirements. |
| ADS8688IPWR | Successor-generation 16-bit SAR ADC; SPI interface; internal reference; 1 MSPS rate; –40°C to +125°C. | Modern embedded systems requiring higher resolution and serial interface; not pin-compatible. | Choose ADS8688IPWR only if resolution upgrade and SPI integration justify redesign; not a drop-in replacement. |
Compared with AD1674BD, AD1674TD trades ±1/2 LSB INL for guaranteed –55°C startup and hermetic reliability; compared with ADS8688IPWR, it retains parallel interface and deterministic timing but sacrifices resolution and modern integration - making AD1674TD irreplaceable in legacy-maintained, high-jitter-margin military platforms.
Availability
AD1674TD is available at Aetrix Electronics and suitable for avionics flight data recorders, tactical radar digitizers, engine control units, and downhole telemetry systems requiring stable component supply across extended temperature and long lifecycle commitments.
Supply support for AD1674TD 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 AD1674 product line was designed for high-reliability data acquisition in military, aerospace, and industrial environments where deterministic timing, wide temperature operation, and guaranteed AC/DC specifications are mandatory.
FAQ
What is the operating temperature range of the AD1674TD?
The AD1674TD is specified for continuous operation from –55°C to +125°C and is screened per MIL-STD-883 for thermal shock, hermeticity, and long-term reliability. This makes AD1674TD suitable for deployment in jet engine compartments, missile guidance sections, and oilfield downhole tools where ambient extremes exceed commercial or industrial grade limits.
Does the AD1674TD require external calibration components?
No. The AD1674TD includes factory-laser-trimmed scaling and bipolar offset resistors, enabling all four input ranges (±5 V, ±10 V, 0–10 V, 0–20 V) without external resistors or potentiometers. Reference is derived from its internal 10 V regulator (REF OUT), and BIP OFF connects directly to REF OUT via a 50 Ω resistor for bipolar operation - no user calibration is needed for baseline accuracy.
Is the AD1674TD pin-compatible with the AD574A and AD674A?
Yes. The AD1674TD maintains identical pinout, signal definitions, and electrical interface behavior with the industry-standard AD574A and AD674A, allowing direct PCB replacement in legacy designs. However, AD1674TD adds integrated sample-and-hold functionality and faster 9–10 µs conversion time - no layout changes are required to upgrade.
What are the power supply requirements for the AD1674TD?
The AD1674TD requires three independent supplies: +5 V (VLOGIC, Pin 1), +12 V or +15 V (VCC, Pin 7), and –12 V or –15 V (VEE, Pin 11). AGND (Pin 9) and DGND (Pin 15) must be connected at a single point only. Total power dissipation is 385–575 mW depending on supply voltages and conversion rate - adequate heatsinking is recommended in sealed enclosures.
How does the AD1674TD handle unipolar versus bipolar input configurations?
The AD1674TD selects input range via hardware connections: for unipolar operation (0–10 V or 0–20 V), BIP OFF (Pin 12) is tied to AGND; for bipolar operation (±5 V or ±10 V), BIP OFF is connected to REF OUT (Pin 8) through a 50 Ω resistor. Input signal is applied to either 10 VIN (Pin 13) or 20 VIN (Pin 14), but not both - mixing spans invalidates calibration.
AD1674TD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- 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:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±11.4V ~ 16.5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- 28-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD1674TD FAQ
1.How can I place an order for AD1674TD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1674TD 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 AD1674TD reliable?
The price and inventory of AD1674TD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1674TD is usually 5 days.
3.What payment methods are accepted for AD1674TD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1674TD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1674TD?
AD1674TD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1674TD 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 AD1674TD?
For technical support, including AD1674TD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1674TD requirements.
6.How does Aetrix verify that AD1674TD is sourced from the original manufacturer or authorized distributors?
All AD1674TD 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 AD1674TD meets industry standards.
7.What is the process for return or replacement of AD1674TD?
All AD1674TD units undergo pre-shipment inspection (PSI). If there is an issue with AD1674TD, 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 AD1674TD part is unused and in its original packaging.
Return procedure for AD1674TD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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