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Analog Devices Inc. AD674BKNZ
- Part No.:
- AD674BKNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD674BKNZ.pdf
- Description:
- IC ADC 12BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,833
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Product details
Overview
AD674BKNZ from Analog Devices is a complete monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with on-chip 10 V 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 from +5 V logic, +12/+15 V analog, and –12/–15 V analog supplies; and delivers ≤15 µs max conversion time. It serves as a drop-in high-speed upgrade for AD574A in industrial data acquisition and test equipment.
For engineers reviewing the AD674BKNZ datasheet, AD674BKNZ pinout, AD674BKNZ application, or AD674BKNZ equivalent, key selection criteria include its industry-standard 28-pin DIP pinout, dual-mode (12-bit word or 8+4-byte) microprocessor interface, laser-trimmed ±1/2 LSB linearity (B grade), and MIL-STD-883-compliant variants for ruggedized systems.
Technical Context
The AD674BKNZ implements a SAR architecture with internal 12-bit current-output DAC, comparator, and precision voltage divider network. Its analog front-end includes factory-laser-trimmed thin-film resistors for offset, scaling, and bipolar offset calibration - enabling four calibrated input ranges without external components.
Digital control uses asynchronous full-control mode (CS/CE/R/C/A0/12-8) or standalone mode (R/C edge-triggered), supporting both 8-bit and 12-bit read cycles. Output buffers are three-state, compatible with 8- and 16-bit microprocessor buses, and feature guaranteed no-missing-codes performance across –40°C to +85°C.
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 - ensures monotonicity and accurate code-center alignment |
| Input Ranges | 0 V–10 V, 0 V–20 V, ±5 V, ±10 V - selectable via external pin configuration |
| Reference Voltage | 10.00 V ±1% - internally trimmed, temperature-compensated, drives 2.0 mA external load |
| Supply Voltages | +5 V (logic), +12/+15 V (VCC), –12/–15 V (VEE) - supports mixed-signal system partitioning |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded instrumentation |
Pinout & Package
AD674BKNZ is housed in a 28-lead plastic DIP (N-28) package with 0.6-inch body width and standard through-hole footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Digital power supply | +5 V ±10% logic rail; powers internal CMOS buffers and control logic |
| 12/8 (Pin 2) | Data format select | LOW = two 8-bit bytes; HIGH = single 12-bit parallel word |
| CS (Pin 3) | Chip Select input | Active LOW; enables device for conversion or read access |
| A0 (Pin 4) | Byte address/short cycle | HIGH during start = 8-bit conversion; LOW = full 12-bit cycle |
| R/C (Pin 5) | Read/Convert control | LOW = initiate conversion; HIGH = enable data read (full-control mode) |
| CE (Pin 6) | Chip Enable input | Active HIGH; synchronizes CS and R/C timing for bus interface |
| VCC (Pin 7) | Analog positive supply | +12 V or +15 V ±5–10%; powers SAR, DAC, and reference circuitry |
| REF OUT (Pin 8) | Analog reference output | 10.00 V ±1% source; supplies REF IN and BIP OFF; supports 2.0 mA load |
| AGND (Pin 9) | Analog ground | Common return for analog inputs, reference, and supplies; must be isolated from DGND |
| REF IN (Pin 10) | Reference input | Connected to REF OUT via 50 Ω resistor; sets DAC full-scale current |
| VEE (Pin 11) | Analog negative supply | –12 V or –15 V ±5–10%; required for bipolar operation and comparator bias |
| BIP OFF (Pin 12) | Bipolar offset adjust | Connected to REF OUT (bipolar) or AGND (unipolar); configures major carry point |
| 10 VIN (Pin 13) | 10 V span analog input | 0 V–10 V unipolar or ±5 V bipolar; 5 kΩ nominal input impedance |
| 20 VIN (Pin 14) | 20 V span analog input | 0 V–20 V unipolar or ±10 V bipolar; 10 kΩ nominal input impedance |
| DGND (Pin 15) | Digital ground | Return for logic outputs and VLOGIC; must be connected to system digital ground plane |
| DB0–DB3 (Pins 16–19) | LSB data outputs | Low-order 4 bits; enabled when A0 = HIGH in 8-bit mode or always in 12-bit mode |
| DB4–DB7 (Pins 20–23) | Middle data outputs | Bits 4–7; enabled when A0 = LOW in 8-bit mode; always active in 12-bit mode |
| DB8–DB11 (Pins 24–27) | MSB data outputs | High-order 4 bits; enabled when A0 = LOW in 8-bit mode; always active in 12-bit mode |
| STS (Pin 28) | Status output | Active HIGH during conversion; goes LOW at completion - used for interrupt or polling |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10 V reference | 10.00 V ±1% with 10 ppm/°C drift - eliminates external reference IC and reduces BOM count |
| Four calibrated input ranges | Hardware-selectable 0 V–10 V, 0 V–20 V, ±5 V, ±10 V - no external gain/offset op amps required |
| Three-state parallel output buffers | Direct interface to 8- or 16-bit microprocessor buses - avoids external bus transceivers |
| Industry-standard AD574A pinout | Drop-in replacement for legacy systems - preserves PCB layout and firmware compatibility |
| Laser-trimmed thin-film resistors | Factory-calibrated offset, linearity, and scaling - achieves ±1/2 LSB INL without user trim |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous monitoring of 4–20 mA sensor loops, thermocouple outputs, and pressure transducers in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC digitizing analog field signals with ±10 V bipolar support and 12-bit resolution for closed-loop feedback accuracy. Use Value: Eliminates need for external signal conditioning; 15 µs conversion enables real-time sampling of fast transients in motor drive diagnostics. | Use Scenario: High-throughput parametric testing of semiconductor devices using programmable stimulus and response capture. IC Role / Device Role / Timing Role: Precision digitizer capturing analog waveforms from DUTs with synchronized trigger and status-driven readout. Use Value: Three-state outputs allow shared bus architecture; 12/8 and A0 pins enable flexible data transfer modes matching tester controller bandwidth. |
| Medical Instrumentation | Avionics Data Acquisition |
Use Scenario: ECG and EEG front-ends requiring low-noise, calibrated bipolar input ranges and stable DC accuracy. IC Role / Device Role / Timing Role: Signal-chain ADC converting differential biopotential signals with ±5 V range and sub-LSB linearity. Use Value: Internal 10 V reference and laser trimming ensure long-term calibration stability critical for FDA-compliant devices. | Use Scenario: Flight data recorders and engine health monitoring systems operating in extended temperature environments. IC Role / Device Role / Timing Role: Ruggedized ADC interfacing with transducers in –40°C to +85°C zones; STS pin provides deterministic conversion completion signaling. Use Value: B-grade qualification and MIL-STD-883 options support DO-160 compliance; 28-pin DIP simplifies conformal coating and mechanical retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7819BRUZ | 12-bit, 1.6 µs conversion, serial SPI interface, +3.3 V only supply | Requires level-shifting for 5 V microcontrollers; lacks internal reference and bipolar support | Choose for space-constrained, low-power, serial-interface designs where speed >15 µs is mandatory |
| ADS7800KP | 12-bit, 10 µs conversion, parallel interface, external reference required, no built-in clock | Needs external 10 V ref, clock oscillator, and output latches - higher BOM cost and layout complexity | Choose when absolute minimal aperture jitter or custom reference sourcing is required |
Compared with AD7819BRUZ and ADS7800KP, the AD674BKNZ offers integrated reference, clock, and bipolar input capability in a pin-compatible AD574A form factor - reducing design risk and validation effort for industrial retrofits and legacy upgrades.
Availability
AD674BKNZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD674BKNZ 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 Wilmington, MA.
The AD674BKNZ belongs to Analog Devices' legacy precision SAR ADC product line, designed specifically for industrial, military, and instrumentation applications demanding calibrated accuracy, wide input range flexibility, and drop-in compatibility with AD574A-based systems.
FAQ
What is the maximum conversion time specification for the AD674BKNZ?
The AD674BKNZ has a maximum conversion time of 15 µs across its full operating temperature range (–40°C to +85°C). This applies to the 12-bit conversion cycle and is guaranteed for the B-grade version. The timing is measured under worst-case supply conditions (+12 V or +15 V VCC, –12 V or –15 V VEE, +5 V VLOGIC) and includes setup, conversion, and status assertion. The AD674BKNZ achieves this while maintaining ±1/2 LSB integral nonlinearity, making it suitable for high-throughput data acquisition where latency and accuracy are both critical.
Does the AD674BKNZ require external components to operate?
No, the AD674BKNZ is a complete monolithic ADC requiring only power supplies (+5 V, +12/+15 V, –12/–15 V), analog input connections, and digital control signals. It integrates a precision 10 V reference, clock generator, SAR core, DAC, comparator, and three-state output buffers. External components are optional only for calibration trimming (e.g., 50 Ω resistor between REF OUT and REF IN) or input protection - not for basic functionality. This integration reduces board area, improves reliability, and accelerates time-to-market compared to discrete ADC + reference + clock solutions.
How does the AD674BKNZ support both unipolar and bipolar input ranges?
The AD674BKNZ supports unipolar (0 V–10 V, 0 V–20 V) and bipolar (±5 V, ±10 V) ranges via hardware pin configuration: 10 VIN and 20 VIN pins accept the analog signal, while BIP OFF (Pin 12) selects mode - tied to REF OUT for bipolar, or to AGND for unipolar. Internal laser-trimmed thin-film resistors configure the input divider and offset network accordingly. No software configuration or external op amps are needed. This hardware-selectable flexibility allows one AD674BKNZ design to serve multiple sensor types across industrial and test applications without redesign.
What is the purpose of the STS pin on the AD674BKNZ?
The STS (Status) pin on the AD674BKNZ is an open-collector digital output that goes HIGH when a conversion is in progress and transitions LOW when conversion completes and data is valid on DB0–DB11. It enables interrupt-driven or polled data acquisition without requiring constant bus monitoring. In microprocessor systems, STS can directly trigger an IRQ line or be sampled by firmware to synchronize read cycles - eliminating timing guesswork and ensuring reliable data capture. Its behavior is consistent across all operating modes (full-control and standalone) and grades.
Is the AD674BKNZ pin-compatible with the AD574A?
Yes, the AD674BKNZ uses the exact same 28-pin DIP pinout as the industry-standard AD574A, including identical signal names, locations, and electrical behavior for all control and data pins. This enables direct drop-in replacement in existing AD574A-based designs. Key improvements include faster 15 µs max conversion time (vs. 35 µs for AD574A), lower power consumption, improved linearity (±1/2 LSB vs. ±0.5 LSB typical), and enhanced temperature stability - all without requiring PCB or firmware changes.
AD674BKNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD674BKNZ FAQ
1.How can I place an order for AD674BKNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD674BKNZ 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 AD674BKNZ reliable?
The price and inventory of AD674BKNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD674BKNZ is usually 5 days.
3.What payment methods are accepted for AD674BKNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD674BKNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD674BKNZ?
AD674BKNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD674BKNZ 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 AD674BKNZ?
For technical support, including AD674BKNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD674BKNZ requirements.
6.How does Aetrix verify that AD674BKNZ is sourced from the original manufacturer or authorized distributors?
All AD674BKNZ 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 AD674BKNZ meets industry standards.
7.What is the process for return or replacement of AD674BKNZ?
All AD674BKNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD674BKNZ, 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 AD674BKNZ part is unused and in its original packaging.
Return procedure for AD674BKNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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