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Analog Devices Inc. AD774BBD
- Part No.:
- AD774BBD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD774BBD.pdf
- Description:
- IC ADC 12BIT SAR 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,024
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Product details
Overview
AD774BBD from Analog Devices is a complete monolithic 12-bit successive-approximation analog-to-digital converter with on-chip 10 V 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 8 µs maximum conversion time in the –40°C to +85°C industrial temperature range using a hermetically sealed 28-lead ceramic DIP package.
For engineers reviewing the AD774BBD datasheet, AD774BBD pinout, AD774BBD application, or AD774BBD equivalent, key selection considerations include its industry-standard AD574A-compatible pinout, flexible 8-/12-bit parallel microprocessor interface, laser-trimmed scaling for calibrated unipolar/bipolar ranges, internal reference stability (10.00 V ±1%, 10 ppm/°C), and guaranteed no missing codes over full temperature range.
Technical Context
The AD774BBD implements a SAR architecture with an integrated 12-bit current-output DAC, comparator, and precision voltage reference. Its analog front-end includes factory-laser-trimmed thin-film resistors for offset, linearity, and span calibration across four input ranges.
Digital control uses active-HIGH CE and active-LOW CS with R/C determining read/convert mode; A0 selects 8-bit short cycle or full 12-bit conversion; 12/8 configures data output as single 12-bit word or two 8-bit bytes. Output buffers are three-state, enabling direct connection to 8- or 16-bit microprocessor buses without external latching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale range |
| Conversion Time (max) | 8 µs - enables high-throughput sampling in real-time control loops |
| Input Ranges | 0 V–10 V, 0 V–20 V, ±5 V, ±10 V - selectable via external resistor configuration at BIP OFF, 10VIN, and 20VIN pins |
| Reference Voltage | 10.00 V ±1% (10 ppm/°C) - stable internal reference available at REF OUT, capable of sourcing 2.0 mA externally |
| Linearity Error (B grade) | ±1/2 LSB - ensures monotonicity and accurate code-center alignment across operating temperature |
| Supply Voltages | +5 V (VLOGIC), +12/+15 V (VCC), –12/–15 V (VEE) - dual-supply analog section enables true bipolar operation |
| No Missing Codes | Guaranteed to 12-bit resolution - all 4096 codes appear in monotonic sequence over full temperature range |
Pinout & Package
AD774BBD is housed in a 28-lead hermetically sealed ceramic DIP package (package option D-28), rated for –40°C to +85°C operation and suitable for high-reliability industrial and military applications where moisture resistance and long-term parameter stability are critical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Logic Supply Input | +5 V ±10% digital power rail; powers internal CMOS logic and output buffers |
| 12/8 (Pin 2) | Data Format Control | Active HIGH selects 12-bit parallel output; LOW enables byte-mode (DB11–DB8 then DB3–DB0 with zero-padded DB7–DB4) |
| CS (Pin 3) | Chip Select Input | Active LOW enables device for conversion or read operations; used for bus arbitration in multi-device systems |
| A0 (Pin 4) | Byte Address / Cycle Select | Active HIGH initiates 8-bit short-cycle conversion; during read, controls which nibble appears on DB11–DB8 vs. DB3–DB0 |
| R/C (Pin 5) | Read/Convert Control | Active LOW starts conversion; HIGH reads data - supports both full-control and standalone timing modes |
| CE (Pin 6) | Chip Enable Input | Active HIGH initiates conversion or read after CS assertion; synchronizes internal state machine and clock enable |
| VCC (Pin 7) | Analog Positive Supply | +12 V or +15 V analog rail powering SAR, DAC, comparator, and reference circuitry |
| REF OUT (Pin 8) | Reference Output | 10 V ±1% buffered reference output; drives external loads up to 2.0 mA while maintaining accuracy during conversion |
| AGND (Pin 9) | Analog Ground | Common return for analog inputs, reference, and analog supply rails; must be isolated from DGND per layout guidelines |
| REF IN (Pin 10) | Reference Input | Connected via 50 Ω resistor to REF OUT for internal reference use; required for proper DAC scaling and calibration |
| VEE (Pin 11) | Analog Negative Supply | –12 V or –15 V analog rail enabling bipolar input operation and full-range comparator swing |
| BIP OFF (Pin 12) | Bipolar Offset Terminal | Connected to REF OUT via 50 Ω for ±5 V/±10 V modes; tied to AGND for 0 V–10 V/0 V–20 V unipolar operation |
| 10 VIN (Pin 13) | 10 V Span Analog Input | Accepts 0 V–10 V (unipolar) or –5 V–+5 V (bipolar); input impedance ≈5 kΩ; not connected when using 20 V span |
| 20 VIN (Pin 14) | 20 V Span Analog Input | Accepts 0 V–20 V (unipolar) or –10 V–+10 V (bipolar); input impedance ≈10 kΩ; not connected when using 10 V span |
| DGND (Pin 15) | Digital Ground | Return path for VLOGIC and digital outputs; must be connected to system digital ground, separate from AGND |
| DB3–DB0 (Pins 16–19) | Data Outputs (LSB) | Lower 4 bits of 12-bit result; enabled during read when A0 = HIGH; tristated otherwise |
| DB7–DB4 (Pins 20–23) | Data Outputs (Mid) | Middle 4 bits; enabled when A0 = LOW in 12-bit mode or 8-bit byte mode; DB7–DB4 = 0 when A0 = HIGH in byte mode |
| DB11–DB8 (Pins 24–27) | Data Outputs (MSB) | Upper 4 bits; always active during read in 12-bit mode; enabled only when A0 = LOW in byte mode |
| STS (Pin 28) | Status Output | Active HIGH during conversion; goes LOW when result is ready and output buffers are valid - used for interrupt-driven or polling-based read timing |
Key Features
| Feature | Design Value |
|---|---|
| Industry-standard AD574A pinout | Enables drop-in replacement in legacy designs without PCB redesign or firmware changes |
| Laser-trimmed thin-film resistors | Minimizes initial offset, linearity, and full-scale errors - eliminates need for external calibration in many applications |
| Four calibrated input ranges | Supports 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V modes via simple external resistor connections - reduces external signal conditioning |
| On-chip 10 V reference with 2.0 mA drive | Provides stable, temperature-compensated reference for internal DAC and external circuitry - avoids external reference IC cost and board space |
| Three-state parallel output buffers | Direct interface to 8-bit or 16-bit microprocessor buses without external latches or transceivers - simplifies system-level timing |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous acquisition of sensor outputs (e.g., pressure, temperature, flow) in PLC-based control cabinets operating in harsh environments. IC Role / Device Role / Timing Role: Primary ADC converting conditioned analog signals to 12-bit digital words for real-time PID loop execution and HMI reporting. Use Value: Hermetic DIP packaging and –40°C to +85°C rating ensure long-term reliability; 8 µs conversion enables ≥100 kSPS effective throughput with minimal latency. | Use Scenario: High-accuracy voltage/current measurement in benchtop multimeters and automated test systems requiring traceable calibration. IC Role / Device Role / Timing Role: Precision digitizer with calibrated input ranges and low linearity error (±1/2 LSB) serving as the core measurement engine. Use Value: Factory-laser-trimmed scaling and internal 10 V reference eliminate drift-related recalibration; no missing codes guarantee measurement integrity across full scale. |
| Avionics Sensor Interfaces | Power Quality Analyzers |
Use Scenario: Converting analog outputs from accelerometers, gyros, and environmental sensors in airborne data acquisition units subject to MIL-STD-883 screening requirements. IC Role / Device Role / Timing Role: Ruggedized ADC providing deterministic 8 µs conversion timing and stable performance under thermal cycling and vibration. Use Value: Ceramic DIP package and B-grade temperature specification meet DO-160 and MIL-STD-883 environmental compliance; internal reference stability reduces system-level compensation complexity. | Use Scenario: Simultaneous sampling of multiple AC voltage and current waveforms in grid-monitoring equipment analyzing harmonics and transient events. IC Role / Device Role / Timing Role: High-speed, high-linearity ADC capturing synchronized samples across phases with precise timing control via STS and R/C signals. Use Value: Guaranteed monotonicity and ±1/2 LSB linearity ensure accurate RMS, THD, and crest factor calculations; flexible input ranges accommodate CT/PT scaling variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD781JRZ | Integrated sample-and-hold, 10 µs acquisition time, SOIC-24 package, no internal reference | Designed for sampled-data systems requiring hold capability; requires external 10 V reference and decoupling | Select when acquisition timing control and reduced external components outweigh need for hermetic packaging and internal reference |
| AD1674KN | Same AD574A pinout, 10 µs conversion, plastic DIP-28, J-grade (0°C to 70°C), ±1 LSB linearity | Commercial-grade alternative with lower temperature range and relaxed linearity spec | Select for cost-sensitive industrial applications where extended temperature range and tighter linearity are not required |
Compared with AD774BBD, AD781JRZ adds sample-and-hold but lacks internal reference and hermetic sealing, while AD1674KN offers identical form factor at lower cost and relaxed specs - AD774BBD remains optimal for high-reliability, wide-temperature, reference-integrated deployments.
Availability
AD774BBD is available at Aetrix Electronics and suitable for industrial process monitoring, avionics sensor interfaces, power quality analyzers, test & measurement equipment, and high-reliability embedded data acquisition systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD774BBD 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD774BBD belongs to Analog Devices' legacy high-precision parallel ADC product line, designed specifically for demanding industrial, military, and aerospace applications requiring guaranteed monotonicity, calibrated input ranges, and hermetic reliability without external support components.
FAQ
What is the maximum conversion time specified for the AD774BBD?
The AD774BBD has a maximum conversion time of 8 µs across its full operating temperature range of –40°C to +85°C. This value is guaranteed for the B-grade version and applies to both 8-bit short-cycle and full 12-bit conversion modes. The timing is measured under worst-case supply conditions (VCC = +12 V ±5%, VEE = –12 V ±5%, VLOGIC = +5 V ±10%) and includes internal clock generation and SAR settling. This performance enables sustained sampling rates exceeding 100 kSPS in burst-mode applications.
Does the AD774BBD require external calibration components?
The AD774BBD does not require external calibration components for basic operation due to factory laser trimming of thin-film resistors for offset, linearity, and full-scale gain. Its internal 10 V reference (10.00 V ±1%, 10 ppm/°C) and calibrated input ranges (0 V–10 V, 0 V–20 V, ±5 V, ±10 V) are functional with only passive external resistors (e.g., 50 Ω between REF OUT and REF IN, and BIP OFF). Trim pots are optional for system-level fine-tuning but omitted in most applications meeting ±1/2 LSB linearity and ±2 LSB offset specifications.
How is the AD774BBD's 12-bit data output structured for microprocessor interfacing?
The AD774BBD supports two data output formats controlled by the 12/8 and A0 pins. With 12/8 HIGH, it outputs a single 12-bit word across DB11–DB0. With 12/8 LOW, it operates in byte mode: A0 LOW enables DB11–DB8 (upper byte), and A0 HIGH enables DB3–DB0 (lower byte) while forcing DB7–DB4 to zero. All outputs are three-state, allowing direct connection to 8-bit or 16-bit data buses without external latches. The STS pin provides status for interrupt-driven or polling-based read synchronization.
What are the absolute maximum ratings for the AD774BBD's power supplies?
The AD774BBD's absolute maximum supply ratings are: VLOGIC = 0 V to +7 V, VCC = 0 V to +16.5 V, and VEE = 0 V to –16.5 V relative to DGND. Exceeding these limits risks permanent damage. Recommended operating ranges are VLOGIC = +4.5 V to +5.5 V, VCC = +11.4 V to +16.5 V (for +12 V or +15 V nominal), and VEE = –16.5 V to –11.4 V (for –12 V or –15 V nominal). Proper decoupling - including 4.7 µF tantalum + 0.1 µF ceramic per supply pin - is mandatory to prevent noise-induced code instability.
Is the AD774BBD pin-compatible with the AD574A, and what advantages does it offer?
Yes, the AD774BBD is fully pin-compatible with the industry-standard AD574A, sharing identical pin numbering, function mapping, and package outline (28-lead DIP). It improves upon the AD574A with faster conversion (8 µs vs. 25 µs max), lower power consumption (375 mW vs. ~500 mW), enhanced linearity (±1/2 LSB vs. ±0.5 LSB typical), and tighter reference accuracy (10.00 V ±1% vs. ±2%). These upgrades enable drop-in replacement in legacy systems while improving throughput, accuracy, and thermal efficiency without PCB or firmware changes.
AD774BBD 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:
- 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:
- -
AD774BBD FAQ
1.How can I place an order for AD774BBD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD774BBD 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 AD774BBD reliable?
The price and inventory of AD774BBD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD774BBD is usually 5 days.
3.What payment methods are accepted for AD774BBD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD774BBD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD774BBD?
AD774BBD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD774BBD 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 AD774BBD?
For technical support, including AD774BBD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD774BBD requirements.
6.How does Aetrix verify that AD774BBD is sourced from the original manufacturer or authorized distributors?
All AD774BBD 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 AD774BBD meets industry standards.
7.What is the process for return or replacement of AD774BBD?
All AD774BBD units undergo pre-shipment inspection (PSI). If there is an issue with AD774BBD, 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 AD774BBD part is unused and in its original packaging.
Return procedure for AD774BBD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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