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Analog Devices Inc. AD674BBRZ
- Part No.:
- AD674BBRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD674BBRZ.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,048
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Product details
Overview
AD674BBRZ 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 supports 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V input ranges; operates on +5 V logic, ±12 V/±15 V analog supplies; and delivers ≤15 µs max conversion time. It is widely used in industrial data acquisition systems requiring high accuracy and microprocessor bus compatibility.
For engineers reviewing the AD674BBRZ datasheet, AD674BBRZ pinout, AD674BBRZ application, or AD674BBRZ equivalent, key selection considerations include its industry-standard AD574A-compatible 28-pin SOIC package, dual-mode (8-/12-bit) parallel interface, laser-trimmed ±1/2 LSB linearity (B grade), internal 10.00 V ±1% reference, and bipolar/unipolar range flexibility without external components.
Technical Context
The AD674BBRZ implements a SAR architecture with on-chip 12-bit current-output DAC, comparator, and precision trimmed thin-film resistor network for scaling and bipolar offset. Its internal 10 V reference exhibits 10 ppm/°C typical temperature coefficient and supplies up to 2.0 mA externally while maintaining stability during conversion.
Control logic supports full-control mode (CS/CE/R/C/A0/12-8 signals) and standalone mode (R/C edge-triggered), enabling direct 8- or 16-bit microprocessor bus interfacing. Output data is left-justified and configurable as one 12-bit word or two 8-bit bytes, with status flag (STS) indicating conversion completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale range |
| Conversion Time (max) | 15 µs - enables ≥66 kSPS throughput in burst mode |
| Linearity Error (B grade) | ±1/2 LSB - guarantees monotonicity and no missing codes across –40°C to +85°C |
| Reference Voltage | 10.00 V ±1% - factory-laser-trimmed, stable 10 ppm/°C, drives external loads up to 2.0 mA |
| Input Ranges | 0 V–10 V, 0 V–20 V, ±5 V, ±10 V - selectable via external connections without gain-switching ICs |
| Supply Voltages | +5 V (VLOGIC), +12 V/+15 V (VCC), –12 V/–15 V (VEE) - supports robust industrial power domains |
| Package | 28-lead plastic SOIC (R-28) - surface-mount compatible, RoHS-compliant, thermal performance validated per JEDEC standards |
Pinout & Package
AD674BBRZ is housed in a 28-lead plastic SOIC (R-28) package with standard 0.3-inch body width and 0.050-inch lead pitch. Pin 1 is marked by a beveled corner; pins are numbered counterclockwise from top-left when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Digital supply input | Provides +5 V ±10% power to internal CMOS logic; decoupling to DGND (Pin 15) required for noise immunity |
| 12/8 (Pin 2) | Digital mode select | High = 12-bit parallel output; Low = byte-mode (DB11–DB8 then DB3–DB0 with zero-padded DB7–DB4) |
| CS (Pin 3) | Chip Select input | Active-low enable for device addressing in multi-peripheral bus systems |
| A0 (Pin 4) | Byte address/short cycle control | High during R/C low = 8-bit conversion; Low = full 12-bit conversion; controls DBx pin enable during read |
| R/C (Pin 5) | Read/Convert command | Low = initiate conversion; High = enable data read; falling edge triggers standalone mode |
| CE (Pin 6) | Chip Enable input | Active-high signal synchronizing CS and R/C to start convert/read cycles; timing-critical setup/hold requirements |
| VCC (Pin 7) | Analog positive supply | +12 V or +15 V analog rail; must be decoupled directly to AGND (Pin 9) with 4.7 µF + 0.1 µF |
| REF OUT (Pin 8) | 10 V reference output | Provides calibrated 10.00 V ±1% source; drives REF IN (Pin 10) and BIP OFF (Pin 12); load must remain constant during conversion |
| AGND (Pin 9) | Analog ground | Common return for analog circuitry; separate from DGND (Pin 15) to minimize digital noise coupling |
| REF IN (Pin 10) | Reference input | Connected via 50 Ω resistor to REF OUT for internal reference use; open or grounded for external reference |
| VEE (Pin 11) | Analog negative supply | –12 V or –15 V analog rail; decoupling to AGND mandatory for full-scale accuracy |
| BIP OFF (Pin 12) | Bipolar offset control | Connected to REF OUT via 50 Ω for ±5 V/±10 V operation; tied to AGND for unipolar 0–10 V/0–20 V |
| 10 VIN (Pin 13) | 10 V span analog input | Accepts 0–10 V (unipolar) or –5 to +5 V (bipolar); 5 kΩ nominal input impedance |
| 20 VIN (Pin 14) | 20 V span analog input | Accepts 0–20 V (unipolar) or –10 to +10 V (bipolar); 10 kΩ nominal input impedance; unused when 10 VIN active |
| DGND (Pin 15) | Digital ground | Return path for VLOGIC and digital I/O; isolated from AGND to preserve SNR |
| DB0–DB3 (Pins 16–19) | Data outputs (LSB) | Lower 4 bits; enabled only when A0 = High during read; three-state controlled by CE/CS |
| DB4–DB7 (Pins 20–23) | Data outputs (mid) | Middle 4 bits; enabled when A0 = Low (DB4–DB7) or A0 = High (DB7–DB4 = 0) in byte mode |
| DB8–DB11 (Pins 24–27) | Data outputs (MSB) | Upper 4 bits; always active in 12-bit mode; disabled in byte mode when A0 = High |
| STS (Pin 28) | Status output | Active-High during conversion; transitions Low within 225 ns of completion; used for interrupt-driven read timing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10 V reference | Eliminates need for external precision reference ICs or trimming networks; reduces BOM count and layout area |
| AD574A pin compatibility | Enables drop-in replacement in legacy designs using AD574A, reducing redesign effort and qualification time |
| Laser-trimmed thin-film resistors | Guarantees ±1/2 LSB linearity and <1 LSB offset error over –40°C to +85°C without user calibration |
| Flexible digital interface | Supports both 8-bit and 12-bit parallel reads, simplifying integration with 8-bit microcontrollers and 16-bit DSPs |
| Four calibrated input ranges | Hardware-selectable 0–10 V, 0–20 V, ±5 V, ±10 V modes eliminate external op-amp gain/level-shift stages |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC digitizing analog sensor signals at ≤10 kSPS with 12-bit resolution and ±5 V bipolar range support. Use Value: Factory-trimmed linearity and internal reference ensure <±0.05% full-scale accuracy without field recalibration across operating temperature. | Use Scenario: Digitizing waveform inputs in benchtop multimeters and automated test systems requiring traceable accuracy. IC Role / Device Role / Timing Role: High-stability ADC capturing DC and low-frequency AC signals with programmable 0–10 V/0–20 V ranges. Use Value: 10 ppm/°C reference drift and ±1/2 LSB INL maintain measurement repeatability across lab ambient variations. |
| Avionics Data Acquisition | Medical Instrumentation |
Use Scenario: Converting transducer outputs from flight control surfaces and environmental sensors in certified avionics modules. IC Role / Device Role / Timing Role: Ruggedized ADC operating from –40°C to +85°C with MIL-STD-883-compliant variants available. Use Value: Hermetic DIP packaging option and extended temperature validation reduce qualification burden for DO-254 hardware assurance. | Use Scenario: Sampling biopotential signals (ECG, EEG) and transducer outputs in diagnostic imaging subsystems. IC Role / Device Role / Timing Role: Precision front-end ADC supporting bipolar ±5 V inputs with low-noise analog section and stable reference. Use Value: Internal 10 V reference and laser-trimmed scaling resistors minimize gain drift affecting diagnostic sensitivity thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7819BRZ | 12-bit SAR ADC with 1.6 µs conversion time, SPI interface, no internal reference; requires external 2.5 V reference | Designed for low-power, space-constrained applications; lacks parallel bus interface and bipolar range support | Select AD7819BRZ only when serial interface, faster conversion, and lower power (<15 mW) outweigh loss of AD574A compatibility and built-in reference |
| ADS7800U | 12-bit SAR ADC with 10 µs conversion time, parallel interface, external reference requirement, and ±5 V input range only | Offers improved SNR (72 dB) and lower power (125 mW), but needs external 5 V reference and external gain/offset circuitry for 0–10 V operation | Select ADS7800U when higher dynamic performance and lower power are critical, and system can accommodate external reference and signal conditioning |
Compared with AD674BBRZ, AD7819BRZ trades integrated reference and parallel bus for speed and serial simplicity, while ADS7800U improves SNR and power efficiency but increases design complexity with external reference and range-setting components.
Availability
AD674BBRZ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, avionics data acquisition, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD674BBRZ 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, founded in 1965 and headquartered in Wilmington, MA.
The AD674B product line was designed to deliver plug-compatible, high-accuracy ADC upgrades for legacy AD574A-based systems, emphasizing minimal redesign, guaranteed linearity, and integrated reference stability for industrial and aerospace applications.
FAQ
What is the maximum conversion time specification for AD674BBRZ?
The AD674BBRZ 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 timing applies across the full operating temperature range of –40°C to +85°C for the B-grade device. The 15 µs value represents worst-case performance under maximum supply voltage variation (+12 V ±5%, –12 V ±5%, +5 V ±10%) and includes all internal SAR sequencing, DAC settling, and comparator decision latency. AD674BBRZ also supports an 8-bit short-cycle mode (≤10 µs) when A0 is asserted high during conversion start.
Does AD674BBRZ require external calibration components for ±5 V bipolar operation?
No, AD674BBRZ does not require external calibration components for ±5 V bipolar operation. When BIP OFF (Pin 12) is connected to REF OUT (Pin 8) through a 50 Ω resistor and REF IN (Pin 10) is similarly connected to REF OUT, the internal laser-trimmed bipolar offset and scaling resistors provide calibrated ±5 V operation. The AD674BBRZ datasheet confirms this configuration yields guaranteed ±1/2 LSB linearity and <6 LSB full-scale error over –40°C to +85°C without user trimming. External trims (R1/R2) are optional for tighter system-level accuracy.
Can AD674BBRZ operate with +12 V and –12 V analog supplies instead of ±15 V?
Yes, AD674BBRZ is fully specified to operate with +12 V (VCC) and –12 V (VEE) analog supplies, in addition to ±15 V. The Absolute Maximum Ratings allow VCC from +11.4 V to +16.5 V and VEE from –16.5 V to –11.4 V, and all electrical specifications-including conversion time, linearity, and reference stability-are guaranteed over this range. Using ±12 V reduces power consumption by ~15% versus ±15 V while maintaining full 12-bit performance, making AD674BBRZ suitable for systems where supply rail constraints or thermal management dictate lower voltage operation.
What is the function of the STS pin on AD674BBRZ and how is it used in system design?
The STS (Status) pin on AD674BBRZ is an active-high open-collector output that signals conversion progress: it goes high when a conversion is initiated (R/C low or CE high) and returns low within 225 ns after conversion completion. In system design, STS enables interrupt-driven data reads-microcontrollers can poll STS or configure it as an external interrupt source-eliminating fixed delay loops and improving CPU efficiency. Because STS timing is tightly specified (tDSC = 225 ns max delay from CE), it supports deterministic real-time sampling in closed-loop control applications using AD674BBRZ.
Is AD674BBRZ pin-compatible with the AD574A, and what advantages does it offer?
Yes, AD674BBRZ is fully pin-compatible with the industry-standard AD574A, sharing identical 28-pin SOIC (R-28) footprint, pin numbering, and signal definitions. Key advantages of AD674BBRZ include faster 15 µs max conversion time (vs. 35 µs for AD574A), lower power consumption (375 mW vs. ~500 mW), improved linearity (±1/2 LSB vs. ±1 LSB for B-grade), integrated 10.00 V ±1% reference (eliminating external reference ICs), and enhanced temperature stability (10 ppm/°C vs. 25 ppm/°C). These improvements enable direct drop-in replacement in AD574A-based systems with immediate performance gains.
AD674BBRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD674BBRZ FAQ
1.How can I place an order for AD674BBRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD674BBRZ 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 AD674BBRZ reliable?
The price and inventory of AD674BBRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD674BBRZ is usually 5 days.
3.What payment methods are accepted for AD674BBRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD674BBRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD674BBRZ?
AD674BBRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD674BBRZ 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 AD674BBRZ?
For technical support, including AD674BBRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD674BBRZ requirements.
6.How does Aetrix verify that AD674BBRZ is sourced from the original manufacturer or authorized distributors?
All AD674BBRZ 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 AD674BBRZ meets industry standards.
7.What is the process for return or replacement of AD674BBRZ?
All AD674BBRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD674BBRZ, 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 AD674BBRZ part is unused and in its original packaging.
Return procedure for AD674BBRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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