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Analog Devices Inc. AD674BBD
- Part No.:
- AD674BBD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD674BBD.pdf
- Description:
- IC ADC 12BIT SAR 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,878
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Product details
Overview
AD674BBD from Analog Devices is a complete monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with integrated voltage reference, clock generator, and three-state digital 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 with ±1/2 LSB integral nonlinearity over –40°C to +85°C. It is used in precision industrial data acquisition systems requiring calibrated, self-contained ADC functionality without external timing or reference components.
For engineers reviewing the AD674BBD datasheet, AD674BBD pinout, AD674BBD application, or AD674BBD equivalent, key selection considerations include its hermetic 28-pin ceramic DIP package, bipolar/unipolar range flexibility, internal 10.00 V ±1% reference with 2.0 mA drive capability, 12-bit resolution with no missing codes guaranteed, and direct interface compatibility with 8- and 16-bit microprocessor buses via byte-addressable or full-word read modes.
Technical Context
The AD674BBD implements a SAR architecture with on-chip 12-bit current-output DAC, comparator, and laser-trimmed thin-film resistor network for scaling and bipolar offset. Its internal 10 V reference is temperature-compensated (10 ppm/°C typical) and trimmed to ±1% initial accuracy, enabling stable full-scale calibration across temperature.
Control logic supports two operational modes: full-control mode (using CS, CE, R/C, A0, and 12/8 pins) and standalone mode (triggered by R/C edge). Conversion timing is deterministic-15 µs max for 12-bit cycles-and status is signaled via active-high STS pin that goes low upon completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit-provides 4096 discrete output codes with no missing codes guaranteed over full temperature range. |
| Conversion Time | 15 µs maximum-enables sampling rates up to ~66.7 kSPS in burst mode with deterministic latency. |
| Integral Nonlinearity | ±1/2 LSB (B grade)-ensures monotonicity and accurate code-center alignment for high-fidelity signal reconstruction. |
| Input Ranges | 0 V–10 V, 0 V–20 V, ±5 V, ±10 V-supports both unipolar sensor outputs and bipolar transducer signals without external gain switching. |
| Reference Voltage | 10.00 V ±1%, 10 ppm/°C typical TC-supplies internal DAC and is available externally to drive bipolar offset resistors and external circuitry (2.0 mA total). |
| Supply Voltages | +5 V (VLOGIC), +12 V/+15 V (VCC), –12 V/–15 V (VEE)-requires dual analog rails and single logic rail; no charge pump or LDO needed. |
| Digital Interface | 8-/12-bit parallel output with three-state buffers-compatible with 8080/8086-style bus timing; supports byte-mode (A0/12/8 controlled) or full-word reads. |
Pinout & Package
AD674BBD is housed in a 28-lead hermetically sealed ceramic DIP (package option D-28), rated for industrial temperature operation (–40°C to +85°C) and suitable for high-reliability applications including avionics and downhole instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Logic power supply input | Supplies +5 V ±10% to internal CMOS logic; decoupling to DGND (Pin 15) is mandatory for noise immunity. |
| 12/8 (Pin 2) | Data format select input | LOW enables 8-bit byte-mode output; HIGH selects 12-bit parallel word output-configures bus interface behavior. |
| CS (Pin 3) | Chip select input | Active LOW; enables device decoding in multi-peripheral systems-must be asserted before CE for valid operation. |
| A0 (Pin 4) | Byte address/short cycle control | HIGH during convert start initiates 8-bit cycle; LOW enables full 12-bit conversion-also selects DB11–DB8 (LOW) or DB3–DB0 (HIGH) during read. |
| R/C (Pin 5) | Read/Convert control | Active LOW initiates conversion in full-control mode; falling edge triggers conversion in standalone mode-dual-role timing pin. |
| CE (Pin 6) | Chip enable input | Active HIGH; latches control inputs and initiates read or convert sequence-timing-critical setup/hold requirements apply (50 ns). |
| VCC (Pin 7) | Positive analog supply | +12 V or +15 V input; powers internal DAC, comparator, and reference-requires local 4.7 µF + 0.1 µF decoupling to AGND (Pin 9). |
| REF OUT (Pin 8) | 10 V reference output | Provides trimmed 10.00 V ±1% reference; drives internal circuitry and external loads up to 2.0 mA-must remain stable during conversion. |
| AGND (Pin 9) | Analog ground | Common return for analog supplies, reference, and inputs-must be isolated from DGND except at single-point star ground. |
| REF IN (Pin 10) | Reference input | Connected via 50 Ω resistor to REF OUT for closed-loop reference operation-sets DAC full-scale current and scaling accuracy. |
| VEE (Pin 11) | Negative analog supply | –12 V or –15 V input; powers analog core-decoupling to AGND essential to suppress noise-induced code errors. |
| BIP OFF (Pin 12) | Bipolar offset adjust | Connected to REF OUT via 50 Ω for ±5 V/±10 V operation; tied to AGND for 0 V–10 V/0 V–20 V unipolar mode-configures input range centering. |
| 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-used only when 20 VIN is not connected. |
| 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-used only when 10 VIN is not connected. |
| DGND (Pin 15) | Digital ground | Return path for logic circuits and output buffers-must be separated from AGND except at system-level ground point. |
| DB0–DB3 (Pins 16–19) | LSB data outputs | Provide bits 0–3 in 12-bit mode; enabled during read when A0 = HIGH-three-state buffered for direct microprocessor bus connection. |
| DB4–DB7 (Pins 20–23) | Middle data outputs | Provide bits 4–7 in 12-bit mode; enabled when A0 = LOW in byte-mode-output float delay <150 ns ensures clean bus release. |
| DB8–DB11 (Pins 24–27) | MSB data outputs | Provide bits 8–11 in 12-bit mode; always active during read-bit 11 (MSB) indicates sign in bipolar formats. |
| STS (Pin 28) | Status output | Active HIGH during conversion; transitions LOW within 225 ns of completion-used for interrupt-driven or polling-based data capture. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10 V reference | 10.00 V ±1% initial accuracy with 10 ppm/°C TC-eliminates need for external reference IC and reduces BOM count and layout area. |
| Factory laser-trimmed scaling | Thin-film resistors trimmed for full-scale calibration error ≤0.1% FS-reduces or eliminates field calibration in production test. |
| Flexible input range support | Four calibrated ranges (0–10 V, 0–20 V, ±5 V, ±10 V) selected by external pin strapping-enables single-part inventory for multiple sensor types. |
| Three-state parallel output | 12-bit bus-compatible interface with byte- or word-read capability-directly connects to 8086, Z80, or FPGA data buses without glue logic. |
| Hermetic ceramic DIP package | 28-pin D-28 package qualified for –40°C to +85°C operation-provides moisture resistance and long-term parameter stability in harsh environments. |
Applications
| Industrial Process Monitoring | Avionics Sensor Interface |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA current loop outputs converted to voltage via precision shunt in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC performing calibrated 12-bit conversion with internal reference and bipolar support for differential sensor signals. Use Value: Eliminates external reference and clock components, reducing module size and improving long-term drift performance over temperature. | Use Scenario: Acquisition of accelerometer and gyroscope analog outputs in flight control computers where EMI resilience and reliability are critical. IC Role / Device Role / Timing Role: High-stability ADC interfacing with conditioned transducer signals under wide temperature excursions and vibration. Use Value: Hermetic DIP packaging and MIL-grade temperature rating ensure consistent 12-bit accuracy without recalibration across mission profiles. |
| Test & Measurement Equipment | Downhole Oilfield Instrumentation |
Use Scenario: Embedded digitizer in portable multimeters and automated test equipment requiring traceable DC voltage measurement. IC Role / Device Role / Timing Role: Precision ADC providing calibrated unipolar/bipolar ranges and repeatable full-scale linearity (±1/2 LSB). Use Value: Factory-trimmed INL and reference enable Class I metrology-grade accuracy without user calibration routines. | Use Scenario: Pressure and temperature sensing in borehole logging tools operating at elevated ambient temperatures and high mechanical stress. IC Role / Device Role / Timing Role: Ruggedized ADC with ceramic DIP package and –40°C to +85°C rating handling analog outputs from piezoresistive sensors. Use Value: Internal reference stability and supply rejection minimize drift induced by battery voltage sag and thermal gradients in sealed housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7819BRUZ | 12-bit SAR ADC with serial SPI interface, 1.2 µs conversion time, single +3 V supply, no internal reference. | Designed for low-power, space-constrained embedded systems-not pin-compatible; requires external reference and level-shifting for industrial buses. | Select when board space, power budget, or modern digital interface (SPI) outweigh need for self-contained parallel interface and internal reference. |
| ADS7800U | 12-bit SAR ADC with parallel interface, 10 µs conversion, ±5 V supplies, external reference required, SOIC-28 package. | Offers faster conversion than AD674BBD but lacks integrated reference and hermetic packaging-lower reliability in extended temperature or high-humidity environments. | Select when higher speed is critical and external reference design is acceptable; avoid where hermetic sealing or reference integration is mandatory. |
Compared with AD7819BRUZ and ADS7800U, the AD674BBD uniquely combines internal 10 V reference, hermetic ceramic DIP packaging, and industry-standard AD574A-compatible pinout-making it irreplaceable in legacy industrial controllers and high-reliability analog acquisition systems where component count, long-term stability, and drop-in upgrade paths matter.
Availability
AD674BBD is available at Aetrix Electronics and suitable for industrial process monitoring, avionics sensor interface, and downhole oilfield instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD674BBD 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 defense markets with precision data conversion and power management solutions.
The AD674BBD belongs to Analog Devices' legacy high-accuracy SAR ADC product line, designed specifically for applications demanding self-contained, calibrated, and field-proven 12-bit digitization in harsh environments without external timing or reference components.
FAQ
What is the maximum conversion time specification for the AD674BBD?
The AD674BBD has a maximum conversion time of 15 µs for a full 12-bit cycle, as specified in the Analog Devices AD674B/AD774B datasheet Rev. C for the B grade at –40°C to +85°C. This timing is guaranteed under worst-case supply conditions (VCC = +12 V ±5%, VEE = –12 V ±5%, VLOGIC = +5 V ±10%) and includes all internal SAR sequencing, DAC settling, and comparator decision latency. The AD674BBD achieves this while maintaining ±1/2 LSB integral nonlinearity.
Does the AD674BBD require external components to operate as a complete ADC?
No, the AD674BBD does not require external components to operate as a complete ADC. It integrates a precision 10.00 V ±1% reference, internal clock generator, 12-bit SAR core, and three-state output buffers. Only power supplies (+5 V, +12/+15 V, –12/–15 V), analog input connections (10 VIN or 20 VIN), and control signals (CS, CE, R/C, A0, 12/8) are needed. External resistors (e.g., 50 Ω between REF OUT and REF IN) are required only for reference closure and bipolar offset configuration-not for basic conversion functionality.
What input voltage ranges does the AD674BBD support, and how are they selected?
The AD674BBD supports four calibrated input ranges: 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V. Selection is determined by external pin strapping: 10 VIN (Pin 13) is used for 0 V–10 V or ±5 V ranges; 20 VIN (Pin 14) is used for 0 V–20 V or ±10 V ranges-only one may be connected. Bipolar operation is enabled by connecting BIP OFF (Pin 12) to REF OUT via a 50 Ω resistor; unipolar mode uses BIP OFF tied to AGND (Pin 9). No software or register writes are needed.
Is the AD674BBD pin-compatible with the AD574A, and what are the key functional improvements?
Yes, the AD674BBD is pin-compatible with the industry-standard AD574A, sharing identical 28-pin DIP pinout and control protocol. Key improvements include 15 µs maximum conversion time (vs. 35 µs for AD574A), ±1/2 LSB integral nonlinearity (vs. ±1 LSB for standard AD574A), lower power consumption (~375 mW vs. ~500 mW), and tighter internal reference accuracy (10.00 V ±1% vs. ±2%). These enhancements enable direct drop-in replacement in existing AD574A-based designs with measurable performance gains.
What is the purpose and electrical specification of the REF OUT pin on the AD674BBD?
The REF OUT pin (Pin 8) provides the AD674BBD's internally generated 10.00 V ±1% reference voltage, trimmed to 10 ppm/°C typical temperature coefficient. It supplies current to the internal DAC and bipolar offset circuitry and can deliver up to 2.0 mA to external loads-including the 50 Ω resistor to REF IN and optional external circuitry-provided the load remains constant during conversion. Any variation in external load current will introduce full-scale gain errors, so dynamic loading (e.g., switching regulators) must be avoided.
AD674BBD 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:
- -
AD674BBD FAQ
1.How can I place an order for AD674BBD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD674BBD 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 AD674BBD reliable?
The price and inventory of AD674BBD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD674BBD is usually 5 days.
3.What payment methods are accepted for AD674BBD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD674BBD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD674BBD?
AD674BBD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD674BBD 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 AD674BBD?
For technical support, including AD674BBD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD674BBD requirements.
6.How does Aetrix verify that AD674BBD is sourced from the original manufacturer or authorized distributors?
All AD674BBD 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 AD674BBD meets industry standards.
7.What is the process for return or replacement of AD674BBD?
All AD674BBD units undergo pre-shipment inspection (PSI). If there is an issue with AD674BBD, 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 AD674BBD part is unused and in its original packaging.
Return procedure for AD674BBD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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