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Analog Devices Inc. AD674BTD
- Part No.:
- AD674BTD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD674BTD.pdf
- Description:
- IC ADC 12BIT SAR 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,277
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Product details
Overview
AD674BTD from Analog Devices is a complete monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with on-chip 10 V reference, clock generator, and three-state digital output buffers. It operates across –55°C to +125°C, supports 0 V–10 V / 0 V–20 V / ±5 V / ±10 V input ranges, achieves ≤15 µs max conversion time, and interfaces directly with 8- or 16-bit microprocessor buses. It is used in high-reliability military avionics data acquisition systems requiring calibrated bipolar/unipolar measurement.
For engineers reviewing the AD674BTD datasheet, AD674BTD pinout, AD674BTD application, or AD674BTD equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, calibrated input range implementation details, and validated drop-in alternatives for ruggedized embedded instrumentation design.
Technical Context
The AD674BTD implements a SAR architecture with internal 10 V reference trimmed to ±1% initial accuracy and 10 ppm/°C typical TC. Its laser-trimmed thin-film resistor network enables four factory-calibrated input spans: 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V - all selectable via external connections to BIP OFF, 10VIN, and 20VIN pins without external components.
It uses BiMOS II process technology to integrate high-precision bipolar analog circuitry (reference, DAC, comparator) with CMOS digital logic (SAR, control state machine, output buffers). The 28-pin ceramic DIP package supports MIL-STD-883-compliant screening and requires only +5 V (VLOGIC), ±12 V/±15 V (VCC/VEE), and analog/digital ground connections for full operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes over full-scale range |
| Conversion Time (max) | 15 µs - enables ≥66 kSPS sustained sampling in burst mode |
| Input Ranges | 0 V–10 V, 0 V–20 V, ±5 V, ±10 V - selectable via pin wiring, no external scaling resistors needed |
| Reference Voltage | 10.00 V ±1% - internally trimmed, drives up to 2.0 mA external load while maintaining stability during conversion |
| Linearity Error (T grade) | ±1 LSB - guaranteed monotonicity and no missing codes across –55°C to +125°C |
| Supply Voltages | +5 V (VLOGIC), +12 V/+15 V (VCC), –12 V/–15 V (VEE) - supports legacy military power architectures |
| Operating Temperature | –55°C to +125°C - qualified per MIL-STD-883 for extended-environment deployment |
Pinout & Package
AD674BTD is supplied in a 28-lead hermetically sealed ceramic dual in-line package (D-28), rated for high-reliability military and aerospace applications. Pin numbering follows standard DIP top-view convention with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Digital supply input | Provides +5 V power to internal CMOS logic; must be decoupled to DGND (Pin 15) with 4.7 µF + 0.1 µF |
| 12/8 (Pin 2) | Digital mode select | LOW = two 8-bit byte reads; HIGH = single 12-bit parallel read - configures bus interface timing |
| CS (Pin 3) | Digital input | Active LOW chip select; must be asserted before CE to enable device for convert/read operations |
| A0 (Pin 4) | Digital input | Controls cycle length: LOW = 12-bit conversion; HIGH = 8-bit short cycle - also selects DB11–DB8 or DB3–DB0 during read |
| R/C (Pin 5) | Digital input | Active HIGH = read; Active LOW = initiate conversion - in standalone mode, falling edge triggers conversion |
| CE (Pin 6) | Digital input | Active HIGH chip enable; initiates conversion or read when CS is active LOW - defines timing window for data access |
| VCC (Pin 7) | Analog supply input | +12 V or +15 V analog supply; decouple directly to AGND (Pin 9) - critical for reference stability |
| REF OUT (Pin 8) | Analog output | 10 V reference output; drives BIP OFF (Pin 12) and REF IN (Pin 10); load must remain constant during conversion |
| AGND (Pin 9) | Analog ground | Common return for analog circuitry; separate from DGND (Pin 15) to prevent digital noise coupling into reference path |
| REF IN (Pin 10) | Analog input | Reference input node; connected via 50 Ω resistor to REF OUT for closed-loop reference regulation |
| VEE (Pin 11) | Analog supply input | –12 V or –15 V analog supply; decouple directly to AGND - essential for bipolar input range integrity |
| BIP OFF (Pin 12) | Analog input | Bipolar offset node; connect to REF OUT via 50 Ω for ±5 V/±10 V operation; tie to AGND for unipolar mode |
| 10VIN (Pin 13) | Analog input | 10 V span input; use for 0 V–10 V or ±5 V ranges; leave unconnected when using 20 V span |
| 20VIN (Pin 14) | Analog input | 20 V span input; use for 0 V–20 V or ±10 V ranges; leave unconnected when using 10 V span |
| DGND (Pin 15) | Digital ground | Common return for digital I/O; isolated from AGND to maintain 12-bit accuracy under dynamic bus loading |
| DB0–DB3 (Pins 16–19) | Digital output | LSB nibble; enabled during read when A0 = HIGH - provides lower 4 bits in both 8-bit and 12-bit modes |
| DB4–DB7 (Pins 20–23) | Digital output | Middle nibble; enabled when A0 = LOW in 12-bit mode; forced to 0 when A0 = HIGH in 8-bit mode |
| DB8–DB11 (Pins 24–27) | Digital output | MSB nibble; enabled when A0 = LOW in 12-bit mode; disabled when A0 = HIGH in 8-bit mode |
| STS (Pin 28) | Digital output | Status flag; HIGH during conversion, LOW when result ready - used for interrupt-driven or polled data capture |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 10 V reference | Trimmed to ±1% accuracy with 10 ppm/°C TC - eliminates need for external reference and reduces calibration overhead |
| Four calibrated input spans | 0 V–10 V, 0 V–20 V, ±5 V, ±10 V - configured by pin wiring only; no external resistors or trimming required for basic operation |
| Three-state output buffers | Direct 8-/16-bit microprocessor bus interface - supports byte-wise (A0-controlled) or full-word reads without external latches |
| MIL-STD-883 compliance | Qualified for T-grade (–55°C to +125°C) in hermetic ceramic DIP - meets screening, burn-in, and mechanical shock requirements for flight hardware |
| Successive-approximation architecture | Deterministic 15 µs max conversion time - enables precise timing control in closed-loop control and real-time monitoring systems |
| Laser-trimmed thin-film resistors | Factory-calibrated offset, linearity, and scaling - guarantees ±1 LSB linearity and no missing codes across full temperature range |
Applications
| Military Flight Data Recorder | Avionics Sensor Signal Conditioning |
|---|---|
Use Scenario: Digitizing analog outputs from accelerometers, gyros, and pressure transducers in airborne black box recorders operating across –55°C to +125°C. IC Role / Device Role / Timing Role: Primary 12-bit ADC performing synchronized multi-channel sampling with deterministic 15 µs conversion latency. Use Value: Hermetic ceramic DIP package and MIL-STD-883 qualification ensure long-term reliability in vibration-prone, wide-temperature environments without recalibration. |
Use Scenario: Converting analog sensor signals (e.g., engine oil temperature, fuel flow) in real-time avionics health monitoring units. IC Role / Device Role / Timing Role: Standalone ADC interfacing directly to 80C86-based controller via 8-bit bus; uses R/C falling edge for autonomous conversion trigger. Use Value: On-chip 10 V reference and factory-trimmed bipolar spans eliminate external precision components, reducing BOM count and board area in SWaP-constrained modules. |
| Ground-Based Radar Signal Acquisition | Tactical Vehicle Power Monitoring |
Use Scenario: Capturing intermediate-frequency (IF) analog waveforms in field-deployable radar test equipment requiring calibrated amplitude fidelity. IC Role / Device Role / Timing Role: High-accuracy ADC operating in full 12-bit parallel mode (12/8 = HIGH) with CS/CE-controlled read cycles for burst-mode capture. Use Value: Guaranteed ±1 LSB linearity and no missing codes ensure accurate representation of low-amplitude signal features critical for FFT-based spectral analysis. |
Use Scenario: Monitoring battery voltage, alternator output, and DC bus levels in armored vehicle electronic control units exposed to extreme thermal cycling. IC Role / Device Role / Timing Role: Dual-range ADC accepting 0–20 V unipolar inputs from shunt-based current sensors and ±10 V differential inputs from isolation amplifiers. Use Value: Pin-selectable 10 V / 20 V spans and bipolar capability allow single-component support of multiple sensor types, simplifying inventory and design reuse. |
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 |
|---|---|---|---|
| AD674BJN | Same core architecture and pinout; J-grade (0°C to 70°C) in plastic DIP; 15 µs conversion; ±1 LSB linearity | Commercial/industrial use only; lacks hermetic sealing and extended temperature qualification | Select when cost-sensitive non-military applications require identical functionality without MIL-STD-883 screening |
| AD774BTD | Pin-compatible upgrade; T-grade ceramic DIP; 8 µs max conversion (vs. 15 µs); same 12-bit resolution and input spans | Higher-speed sampling required; identical environmental rating and calibration performance | Select when system timing budget demands sub-10 µs conversion latency while retaining full compatibility and ruggedization |
Compared with AD674BJN, AD674BTD provides extended temperature operation and hermetic reliability for mission-critical systems; compared with AD774BTD, it trades speed for marginally lower power consumption in thermally constrained deployments where 15 µs latency is acceptable.
Availability
AD674BTD is available at Aetrix Electronics and suitable for military flight data recorders, avionics sensor signal conditioning, and ground-based radar signal acquisition requiring stable component supply across extended temperature and long lifecycle programs.
Supply support for AD674BTD 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, serving precision instrumentation, aerospace, and industrial markets since 1965.
The AD674B series belongs to Analog Devices' legacy high-reliability data acquisition product line, designed specifically for ruggedized embedded systems demanding calibrated 12-bit accuracy, wide-temperature operation, and minimal external component count.
FAQ
What is the maximum conversion time specification for AD674BTD?
The AD674BTD has a maximum conversion time of 15 µs for a full 12-bit cycle, as specified in the official Analog Devices datasheet Rev. C. This value is guaranteed across the full –55°C to +125°C operating temperature range and applies to both unipolar and bipolar input configurations. The timing is deterministic and independent of input signal level, making AD674BTD suitable for real-time control loops with strict latency budgets.
Does AD674BTD require external components to operate in ±10 V bipolar mode?
No, AD674BTD does not require external components to operate in ±10 V bipolar mode. When BIP OFF (Pin 12) is connected to REF OUT (Pin 8) via a 50 Ω resistor and the analog signal is applied between 20VIN (Pin 14) and AGND (Pin 9), the AD674BTD uses its factory-laser-trimmed internal resistor network to deliver calibrated ±10 V operation. No external op amps, references, or scaling resistors are needed for baseline functionality.
How is the 10 V internal reference of AD674BTD used to drive external circuitry?
The AD674BTD's internal 10 V reference is available at REF OUT (Pin 8) and can supply up to 2.0 mA to external loads while maintaining stability during conversion - sufficient to drive the BIP OFF node, REF IN (Pin 10), and additional external circuitry such as gain-setting resistors or auxiliary ADCs. However, any external load must remain constant during conversion; varying loads will introduce gain error due to reference droop.
What package type and screening level does AD674BTD use?
AD674BTD is supplied in a 28-lead hermetically sealed ceramic dual in-line package (D-28) and is screened to MIL-STD-883 requirements for the T-grade temperature range (–55°C to +125°C). This includes mechanical shock, temperature cycling, and steady-state life testing - confirming suitability for aerospace, defense, and other high-reliability applications where long-term parametric stability is mandatory.
Can AD674BTD interface directly with an 8-bit microprocessor bus?
Yes, AD674BTD supports direct 8-bit microprocessor bus interface using its flexible digital control scheme. With 12/8 (Pin 2) set LOW and A0 (Pin 4) toggled between LOW and HIGH, the AD674BTD outputs the upper 8 bits (DB11–DB4) and lower 4 bits (DB3–DB0 padded with zeros) in two consecutive 8-bit reads - eliminating need for external latches or glue logic in legacy 8-bit system designs.
AD674BTD 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):
- -
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- 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:
- -
AD674BTD FAQ
1.How can I place an order for AD674BTD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD674BTD 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 AD674BTD reliable?
The price and inventory of AD674BTD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD674BTD is usually 5 days.
3.What payment methods are accepted for AD674BTD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD674BTD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD674BTD?
AD674BTD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD674BTD 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 AD674BTD?
For technical support, including AD674BTD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD674BTD requirements.
6.How does Aetrix verify that AD674BTD is sourced from the original manufacturer or authorized distributors?
All AD674BTD 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 AD674BTD meets industry standards.
7.What is the process for return or replacement of AD674BTD?
All AD674BTD units undergo pre-shipment inspection (PSI). If there is an issue with AD674BTD, 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 AD674BTD part is unused and in its original packaging.
Return procedure for AD674BTD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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