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Analog Devices Inc. AD674BBR
- Part No.:
- AD674BBR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD674BBR.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,084
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Product details
Overview
AD674BBR from Analog Devices is a complete monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with on-chip 10 V reference, clock, and three-state digital output buffers. It supports ±5 V/±10 V bipolar and 0 V–10 V/0 V–20 V unipolar input ranges, operates from +5 V logic and ±12 V/±15 V analog supplies, 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 direct microprocessor bus interfacing.
For engineers reviewing the AD674BBR datasheet, AD674BBR pinout, AD674BBR application, or AD674BBR equivalent, key selection considerations include its industry-standard AD574A-compatible 28-pin SOIC package, dual-mode 8-/12-bit parallel data output, internal reference stability (10.00 V ±1%, 10 ppm/°C), and guaranteed no missing codes across full temperature range.
Technical Context
The AD674BBR implements a SAR architecture with integrated current-output DAC, comparator, and laser-trimmed thin-film resistor network for scaling and bipolar offset. Its control logic supports both full-control mode (using CS, CE, R/C, A0, 12/8) and standalone mode (triggered by R/C edge), enabling flexible integration with 8- or 16-bit microprocessors.
It features on-chip voltage divider networks for 10 V and 20 V span inputs, programmable bipolar/unipolar operation via BIP OFF pin configuration, and status flag (STS) signaling conversion completion. The internal 10 V reference drives external loads up to 2.0 mA while maintaining accuracy during conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with guaranteed monotonicity and no missing codes. |
| Conversion Time (max) | 15 µs - enables sampling rates up to ~66.7 kSPS in high-speed data acquisition systems. |
| Integral Nonlinearity | ±1/2 LSB - ensures absolute accuracy within 0.012% of full scale for calibrated systems. |
| Input Ranges | ±5 V, ±10 V (bipolar); 0–10 V, 0–20 V (unipolar) - supports direct connection to transducer outputs without external signal conditioning. |
| Reference Voltage | 10.00 V ±1% (10 ppm/°C) - stable internal reference eliminates need for external precision reference in most applications. |
| Supply Voltages | +5 V (VLOGIC), +12/+15 V (VCC), –12/–15 V (VEE) - standard industrial bipolar supply configuration compatible with legacy systems. |
| Package | 28-lead plastic SOIC (R-28) - surface-mount footprint suitable for automated assembly and space-constrained PCB layouts. |
Pinout & Package
AD674BBR is housed in a 28-lead plastic small-outline integrated circuit (SOIC) package (R-28), pin-compatible with the industry-standard AD574A footprint. This package supports reflow soldering and provides mechanical robustness for industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Digital power supply input | Supplies +5 V logic core; 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 | Configures output format: HIGH = single 12-bit word; LOW = two 8-bit bytes (MSB first, LSB zero-padded). |
| CS (Pin 3) | Chip Select input | Active LOW; enables device for read or convert operations when CE is also asserted. |
| A0 (Pin 4) | Byte address/short cycle input | During conversion start: LOW = 12-bit cycle, HIGH = 8-bit cycle; during read: controls DB11–DB4 vs. DB3–DB0 enablement. |
| R/C (Pin 5) | Read/Convert control input | Active HIGH = read data; Active LOW = initiate conversion (full-control mode); falling edge triggers conversion (standalone mode). |
| CE (Pin 6) | Chip Enable input | Active HIGH; initiates conversion or read when CS is LOW and R/C state is valid; defines timing window for control signals. |
| VCC (Pin 7) | Analog positive supply | +12 V or +15 V analog rail; must be decoupled to AGND (Pin 9) with low-ESR capacitors to prevent code instability. |
| REF OUT (Pin 8) | Analog reference output | 10.00 V ±1% buffered reference; drives BIP OFF (Pin 12) and REF IN (Pin 10); supports ≤2.0 mA external load. |
| AGND (Pin 9) | Analog ground | Common return for analog circuitry; must be isolated from DGND (Pin 15) except at single-point star ground to minimize noise coupling. |
| REF IN (Pin 10) | Reference input | 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 analog rail; decoupling to AGND is critical for bipolar mode accuracy and noise rejection. |
| BIP OFF (Pin 12) | Bipolar offset control | 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 | Accepts 0–10 V (unipolar) or ±5 V (bipolar); input impedance ≈5 kΩ; not connected when using 20 VIN. |
| 20 VIN (Pin 14) | 20 V span analog input | Accepts 0–20 V (unipolar) or ±10 V (bipolar); input impedance ≈10 kΩ; not connected when using 10 VIN. |
| DGND (Pin 15) | Digital ground | Common return for logic outputs and VLOGIC; must be separated from AGND except at system-level ground point. |
| DB0–DB3 (Pins 16–19) | Digital output bits (LSB) | Low-order 4 bits; enabled during read when A0 = HIGH; tri-stated when A0 = LOW in 12-bit mode. |
| DB4–DB7 (Pins 20–23) | Digital output bits (middle) | Middle 4 bits; enabled when A0 = LOW in 12-bit mode; output zeros when A0 = HIGH in 8-bit byte mode. |
| DB8–DB11 (Pins 24–27) | Digital output bits (MSB) | High-order 4 bits; always active during read; MSB (DB11) is bit 11 of 12-bit result. |
| STS (Pin 28) | Status output | Active HIGH during conversion; goes LOW when result is ready and output buffers are enabled for read access. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 10 V reference | 10.00 V ±1% with 10 ppm/°C drift - eliminates external reference component count and layout complexity while ensuring consistent full-scale calibration. |
| AD574A pin compatibility | Direct drop-in replacement for legacy AD574A designs - enables performance upgrade (faster conversion, lower power) without PCB redesign. |
| Flexible digital interface | Supports 8-bit or 12-bit parallel readout via A0 and 12/8 pins - simplifies integration with both 8-bit microcontrollers and 16-bit processors without glue logic. |
| Laser-trimmed resistor network | Factory-trimmed scaling and bipolar offset resistors - guarantees four calibrated input ranges (±5 V, ±10 V, 0–10 V, 0–20 V) without user calibration in most applications. |
| Three-state output buffers | Bus-compatible outputs with controlled enable timing - allows direct connection to shared microprocessor data buses without external transceivers. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensor outputs in PLC-based control cabinets operating at –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor signals with 12-bit resolution and guaranteed monotonicity for closed-loop feedback integrity. Use Value: ±1/2 LSB INL ensures <0.012% full-scale error in calibrated systems, supporting SIL-2 functional safety compliance without additional redundancy. | Use Scenario: High-accuracy benchtop multimeters and automated test equipment requiring stable DC voltage measurement over extended temperature ranges. IC Role / Device Role / Timing Role: Precision front-end ADC capturing calibrated reference voltages and DUT outputs with minimal gain/offset drift. Use Value: Internal 10 V reference (10 ppm/°C) and laser-trimmed resistors reduce system-level calibration frequency from quarterly to annual, lowering TCO. |
| Avionics Data Acquisition | Medical Diagnostic Instrumentation |
Use Scenario: Signal conditioning module in airborne health and usage monitoring systems (HUMS) where weight, reliability, and wide-temperature operation are critical. IC Role / Device Role / Timing Role: Ruggedized ADC converting transducer outputs from vibration, strain, and temperature sensors in harsh EMI environments. Use Value: Hermetic-grade packaging option (AD674BAD/BBD) and MIL-STD-883 compliance support DO-160 qualification; SOIC version meets RTCA DO-254 design assurance. | Use Scenario: Patient vital sign monitors requiring FDA-cleared analog front ends with traceable metrology and long-term stability. IC Role / Device Role / Timing Role: Clinical-grade ADC digitizing ECG, EEG, and blood pressure waveforms with deterministic 15 µs conversion latency. Use Value: Guaranteed no missing codes and ±1/2 LSB linearity ensure waveform fidelity for arrhythmia detection algorithms without interpolation artifacts. |
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 serial SPI interface; 3.3 V only; no internal reference; 2.5 µs conversion time. | Requires external reference and level-shifting for 5 V systems; suited for low-pin-count, low-power embedded designs. | Select AD7819BRZ only if board space, power budget, or serial interface preference outweighs need for parallel bus compatibility and self-contained operation. |
| ADS7800U | 12-bit SAR ADC with parallel interface; ±5 V supplies; 10 µs conversion; external reference required; 28-pin PDIP only. | Lacks internal reference and bipolar offset circuitry; requires external 10 V reference and trimming network for ±5 V operation. | Choose ADS7800U only when legacy PDIP footprint is mandatory and system-level reference/calibration infrastructure already exists. |
Compared with AD7819BRZ and ADS7800U, the AD674BBR uniquely integrates reference, clock, and bipolar scaling in a drop-in AD574A-compatible SOIC package-reducing BOM count by ≥4 components and eliminating reference drift-induced gain errors in field-deployed systems.
Availability
AD674BBR is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, avionics data acquisition, and medical diagnostic instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD674BBR 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 product line was designed to provide pin-compatible, higher-performance upgrades to the industry-standard AD574A ADC-delivering faster conversion, improved linearity, and integrated reference functionality for demanding data acquisition applications.
FAQ
What is the maximum conversion time specification for the AD674BBR?
The AD674BBR has a maximum conversion time of 15 µs across its full operating temperature range of –40°C to +85°C. This value is guaranteed for both 8-bit and 12-bit conversion cycles under worst-case supply conditions (+5 V ±10%, +12 V/+15 V ±10%, –12 V/–15 V ±10%). The 15 µs figure applies specifically to the AD674BBR grade and distinguishes it from the faster AD774BBR variant (8 µs max). This timing enables sustained sampling rates up to approximately 66.7 kSPS in continuous acquisition systems.
Does the AD674BBR require external calibration components for basic operation?
No, the AD674BBR does not require external calibration components for basic operation. Its laser-trimmed thin-film resistors provide factory-calibrated scaling and bipolar offset, supporting four input ranges (±5 V, ±10 V, 0–10 V, 0–20 V) with guaranteed ±1/2 LSB integral nonlinearity. A 50 Ω resistor between REF OUT and REF IN is required for internal reference use, and BIP OFF must be connected to REF OUT (bipolar) or AGND (unipolar)-but no trimmers, op amps, or external references are needed for functional operation. The AD674BBR datasheet confirms that "in many applications, no calibration trimming will be required."
Can the AD674BBR operate with a single +5 V supply?
No, the AD674BBR cannot operate with a single +5 V supply. It requires three independent supply rails: +5 V (VLOGIC, Pin 1), +12 V or +15 V (VCC, Pin 7), and –12 V or –15 V (VEE, Pin 11). The analog section uses bipolar supplies to support ±5 V and ±10 V input ranges and maintain linearity across the full 12-bit transfer function. Attempting to power VCC or VEE from +5 V will result in catastrophic failure or undefined behavior, as confirmed by the Absolute Maximum Ratings table specifying VCC to DGND = 0 to +16.5 V and VEE to DGND = 0 to –16.5 V.
What is the purpose of the 12/8 and A0 pins on the AD674BBR?
The 12/8 and A0 pins configure the AD674BBR's digital interface mode. The 12/8 pin selects overall data organization: HIGH enables single 12-bit word output; LOW enables two 8-bit byte reads (MSB first, LSB zero-padded). The A0 pin controls byte addressing during read cycles: when 12/8 = LOW and A0 = LOW, DB11–DB8 are enabled; when A0 = HIGH, DB3–DB0 are enabled and DB7–DB4 are forced to zero. During conversion start, A0 = LOW initiates a full 12-bit cycle; A0 = HIGH initiates an abbreviated 8-bit cycle. These pins allow seamless integration with both 8-bit and 16-bit microprocessor buses without external logic.
Is the AD674BBR pin-compatible with the AD574A, and what are the key functional improvements?
Yes, the AD674BBR is fully pin-compatible with the AD574A in the same 28-pin SOIC (R-28) package. Key functional improvements include: 15 µs maximum conversion time versus 35 µs for the AD574A; ±1/2 LSB integral nonlinearity (vs. ±1 LSB for AD574A); integrated 10 V reference (eliminating external reference IC); lower power consumption (375 mW typical vs. 500+ mW); and enhanced temperature stability (10 ppm/°C reference drift vs. 25 ppm/°C). These improvements enable direct drop-in replacement in legacy AD574A designs while improving system accuracy, speed, and power efficiency without PCB changes.
AD674BBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
AD674BBR FAQ
1.How can I place an order for AD674BBR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD674BBR 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 AD674BBR reliable?
The price and inventory of AD674BBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD674BBR is usually 5 days.
3.What payment methods are accepted for AD674BBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD674BBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD674BBR?
AD674BBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD674BBR 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 AD674BBR?
For technical support, including AD674BBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD674BBR requirements.
6.How does Aetrix verify that AD674BBR is sourced from the original manufacturer or authorized distributors?
All AD674BBR 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 AD674BBR meets industry standards.
7.What is the process for return or replacement of AD674BBR?
All AD674BBR units undergo pre-shipment inspection (PSI). If there is an issue with AD674BBR, 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 AD674BBR part is unused and in its original packaging.
Return procedure for AD674BBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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