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Analog Devices Inc. AD674BAD
- Part No.:
- AD674BAD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD674BAD.pdf
- Description:
- IC ADC 12BIT SAR 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,791
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Product details
Overview
AD674BAD from Analog Devices is a complete monolithic 12-bit successive-approximation analog-to-digital converter with integrated voltage reference, clock, and three-state output buffers. It operates on ±12 V/±15 V analog supplies and +5 V logic supply, supports 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V input ranges, and delivers 15 µs maximum conversion time across –40°C to +85°C industrial temperature range in hermetically sealed 28-lead ceramic DIP package for precision data acquisition in test equipment and industrial control systems.
For engineers reviewing the AD674BAD datasheet, AD674BAD pinout, AD674BAD application, or AD674BAD equivalent, this page provides verified technical context, exact pin functions, calibrated input range behavior, timing-critical interface constraints, and validated alternatives for drop-in replacement or design migration scenarios requiring MIL-grade stability and laser-trimmed accuracy.
Technical Context
The AD674BAD implements a SAR architecture with internal 10.00 V ±1% trimmed reference and on-chip clock, eliminating external timing components. Its analog front-end includes factory-laser-trimmed thin-film resistors for scaling and bipolar offset, enabling four calibrated input ranges without external calibration circuitry.
Digital interface uses dual-mode three-state buffers supporting either 12-bit parallel read or byte-oriented 8+4-bit access via A0 and 12/8 control pins. Conversion is initiated by R/C falling edge in standalone mode or CE/R/C combination in full-control mode, with status flag (STS) indicating active conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale range |
| Conversion Time | 15 µs max - enables ≥66 kSPS throughput in burst-mode acquisition |
| Input Ranges | 0 V–10 V, 0 V–20 V, ±5 V, ±10 V - selectable via external resistor configuration at BIP OFF and REF IN |
| Reference Voltage | 10.00 V ±1% - internally trimmed, available at REF OUT with 2.0 mA drive capability for external circuitry |
| Linearity Error | ±1 LSB max - guaranteed monotonicity and no missing codes across –40°C to +85°C |
| Supply Voltages | +5 V (VLOGIC), +12/+15 V (VCC), –12/–15 V (VEE) - requires separate analog/digital ground planes (AGND/DGND) |
| Package | 28-lead hermetic ceramic DIP - qualified for industrial temperature range and long-term reliability in harsh environments |
Pinout & Package
AD674BAD is housed in a 28-lead hermetically sealed ceramic dual in-line package (D-28), designed for high-reliability industrial and extended-temperature 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 power supply input | +5 V logic rail; must be decoupled directly to DGND (Pin 15) with 4.7 µF + 0.1 µF capacitor network |
| 12/8 (Pin 2) | Digital mode select input | LOW = two 8-bit reads; HIGH = single 12-bit parallel read - determines data organization for microprocessor interface |
| CS (Pin 3) | Chip Select input | Active LOW; enables device decoding in multi-peripheral bus systems; must be stable before CE assertion |
| A0 (Pin 4) | Byte address/short cycle input | HIGH during convert start = 8-bit cycle; LOW = full 12-bit cycle; during read = selects MSB or LSB nibble |
| R/C (Pin 5) | Read/Convert control input | Active LOW = initiate conversion (standalone mode); Active HIGH = enable data read (full-control mode) |
| CE (Pin 6) | Chip Enable input | Active HIGH; initiates conversion or read when CS is asserted; timing-critical setup/hold requirements apply |
| VCC (Pin 7) | Analog positive supply | +12 V or +15 V; must be decoupled to AGND (Pin 9); noise on this rail directly impacts full-scale calibration |
| REF OUT (Pin 8) | Analog reference output | 10.00 V ±1% source; drives internal DAC and external bipolar offset network; load must remain constant during conversion |
| AGND (Pin 9) | Analog ground reference | Common return for analog inputs, reference, and supplies; must be isolated from DGND except at single-point star ground |
| REF IN (Pin 10) | Reference input terminal | Connected via 50 Ω resistor to REF OUT for internal reference use; open or misconnected causes calibration failure |
| VEE (Pin 11) | Analog negative supply | –12 V or –15 V; decoupling to AGND is mandatory; ripple here induces bipolar offset drift |
| BIP OFF (Pin 12) | Bipolar offset configuration | Connected to REF OUT via 50 Ω for ±5 V/±10 V operation; tied to AGND for 0–10 V/0–20 V unipolar mode |
| 10 VIN (Pin 13) | 10 V span analog input | 0–10 V unipolar or ±5 V bipolar input node; 5 kΩ nominal input impedance; not connected when using 20 VIN |
| 20 VIN (Pin 14) | 20 V span analog input | 0–20 V unipolar or ±10 V bipolar input node; 10 kΩ nominal input impedance; not connected when using 10 VIN |
| DGND (Pin 15) | Digital ground reference | Return for logic I/O and VLOGIC; must be separated from AGND to prevent digital noise coupling into analog path |
| DB0–DB3 (Pins 16–19) | Digital output bits (LSB) | Lower 4 bits of 12-bit word; enabled only when A0 = HIGH during read; tristated otherwise |
| DB4–DB7 (Pins 20–23) | Digital output bits (mid) | Middle 4 bits; enabled when A0 = LOW (MSB byte) or A0 = HIGH (LSB byte with DB4–DB7 = 0) |
| DB8–DB11 (Pins 24–27) | Digital output bits (MSB) | Upper 4 bits; always active during valid read; MSB (DB11) indicates sign in bipolar mode |
| STS (Pin 28) | Status output | Active HIGH during conversion; goes LOW within 225 ns after completion; used for interrupt-driven or polled data capture |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10 V reference | 10.00 V ±1% with 10 ppm/°C tempco - eliminates need for external reference and reduces board space/cost |
| Four calibrated input ranges | Hardware-configurable 0–10 V, 0–20 V, ±5 V, ±10 V - no software scaling required for full resolution |
| Three-state output buffers | Direct 8-/16-bit microprocessor bus interface - avoids external latch or transceiver in embedded controller designs |
| Laser-trimmed thin-film resistors | Factory-calibrated offset, linearity, and scaling - achieves ±1 LSB INL without user trim in most applications |
| Hermetic ceramic DIP package | MIL-STD-883 compliant option available - ensures long-term parameter stability in humid, high-vibration, or high-reliability environments |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous analog sensor signal digitization in PLC-based control cabinets with ambient temperatures up to +85°C and EMI exposure. IC Role / Device Role / Timing Role: Primary ADC capturing 4–20 mA loop outputs and thermocouple signals at ≤66 kSPS with deterministic 15 µs conversion latency. Use Value: Hermetic DIP package ensures parameter stability over 10+ years; integrated reference removes calibration drift contributors in unattended systems. | Use Scenario: High-accuracy voltage/current measurement subsystem in benchtop multimeters and parametric analyzers. IC Role / Device Role / Timing Role: Precision digitizer interfacing to op-amp front-ends; uses ±10 V bipolar range and 12-bit resolution for 0.024% FS accuracy. Use Value: Laser-trimmed linearity (±1 LSB) and 10 ppm/°C reference tempco enable <0.05% total error without periodic recalibration. |
| Avionics Sensor Interface | Medical Diagnostic Instrumentation |
Use Scenario: Analog signal conditioning for pressure, temperature, and position sensors in flight control computers operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Ruggedized ADC providing fault-tolerant digitization with STS flag for health monitoring and watchdog-triggered reacquisition. Use Value: Ceramic DIP construction withstands thermal cycling and vibration; MIL-STD-883 screening available for DO-254 compliance. | Use Scenario: Digitizing biopotential signals (ECG, EEG) and transducer outputs in portable diagnostic devices requiring low power and high SNR. IC Role / Device Role / Timing Role: Low-noise ADC with 0–10 V unipolar input driving isolated microcontroller via 12-bit parallel bus. Use Value: Internal reference and trimming eliminate external precision components, reducing BOM count and improving channel-to-channel matching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD674BJN | Plastic DIP, 0°C to 70°C, same 15 µs conversion time and ±1 LSB linearity but lower temperature rating and non-hermetic package | Suitable for commercial-grade instrumentation where cost and solderability outweigh long-term reliability needs | Select AD674BJN only if operating environment stays within 0–70°C and humidity exposure is controlled |
| AD1674TQ | Same pinout, 10 µs sampling time, includes sample-and-hold; requires external reference; different power supply scheme (single +15 V) | Preferred for dynamic signal capture requiring aperture accuracy; not drop-in due to REF IN/OUT and supply pin differences | Choose AD1674TQ when acquiring fast-changing waveforms; verify layout changes for S/H decoupling and reference routing |
Compared with AD674BJN, AD674BAD offers extended temperature range and hermetic sealing for field-deployed systems, while AD1674TQ trades integrated reference for faster sampling and built-in S/H-making it superior for transient analysis but requiring redesign of reference and supply networks.
Availability
AD674BAD is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, avionics sensor interfaces, and medical diagnostic instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD674BAD 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 industrial, automotive, communications, and healthcare markets since 1965.
The AD674B series belongs to Analog Devices' legacy precision ADC product line, engineered for applications demanding self-contained, calibrated, pin-compatible upgrades to AD574A with improved speed, lower power, and enhanced temperature stability.
FAQ
What is the maximum conversion rate supported by the AD674BAD?
The AD674BAD has a maximum conversion time of 15 µs, enabling a theoretical maximum throughput of approximately 66,667 samples per second under ideal timing conditions. This assumes minimal inter-conversion overhead and proper bus handshaking using the STS flag or CE timing. Real-world sustained rates depend on microprocessor bus speed, read cycle duration, and system-level interrupt latency. The AD674BAD datasheet specifies tC = 9–15 µs for 12-bit cycles across its –40°C to +85°C operating range.
Can the AD674BAD operate with a single +5 V supply?
No, the AD674BAD requires three separate supplies: +5 V for VLOGIC (Pin 1), +12 V or +15 V for VCC (Pin 7), and –12 V or –15 V for VEE (Pin 11). It cannot function with only a +5 V supply. The analog section relies on dual-rail operation to support bipolar input ranges (±5 V, ±10 V) and maintain linearity across full-scale excursions. Attempting single-supply operation will result in undefined behavior, failed conversions, or permanent damage due to violation of absolute maximum ratings.
How does the AD674BAD handle bipolar versus unipolar input configurations?
The AD674BAD selects bipolar or unipolar mode via hardware connections: tie BIP OFF (Pin 12) to REF OUT (Pin 8) through a 50 Ω resistor for ±5 V or ±10 V operation; connect BIP OFF to AGND (Pin 9) for 0–10 V or 0–20 V unipolar mode. Input selection is made by applying signal to either 10 VIN (Pin 13) or 20 VIN (Pin 14), never both. The internal laser-trimmed resistors ensure calibrated gain and offset for each configuration without software correction.
Is the AD674BAD pin-compatible with the AD574A?
Yes, the AD674BAD is fully pin-compatible with the industry-standard AD574A, sharing identical pin numbering, signal definitions, and physical footprint in the 28-lead DIP package. This allows direct replacement in existing AD574A-based designs. However, the AD674BAD offers faster conversion (15 µs vs. 35 µs), lower power consumption, and improved linearity (±1 LSB vs. ±0.5 LSB typical), making it a functional and performance upgrade without PCB modification.
What decoupling is required for stable operation of the AD674BAD?
Stable AD674BAD operation requires dedicated decoupling on all three supplies: a 4.7 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor from VLOGIC (Pin 1) to DGND (Pin 15); identical networks from VCC (Pin 7) and VEE (Pin 11) to AGND (Pin 9). These must be placed within 5 mm of their respective pins. Shared or remote decoupling causes supply noise coupling, resulting in code flicker, increased INL, or conversion failures-especially critical for the ±12 V/±15 V analog rails.
AD674BAD 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD674BAD FAQ
1.How can I place an order for AD674BAD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD674BAD 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 AD674BAD reliable?
The price and inventory of AD674BAD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD674BAD is usually 5 days.
3.What payment methods are accepted for AD674BAD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD674BAD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD674BAD?
AD674BAD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD674BAD 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 AD674BAD?
For technical support, including AD674BAD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD674BAD requirements.
6.How does Aetrix verify that AD674BAD is sourced from the original manufacturer or authorized distributors?
All AD674BAD 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 AD674BAD meets industry standards.
7.What is the process for return or replacement of AD674BAD?
All AD674BAD units undergo pre-shipment inspection (PSI). If there is an issue with AD674BAD, 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 AD674BAD part is unused and in its original packaging.
Return procedure for AD674BAD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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