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Analog Devices Inc. AD1674BRZ
- Part No.:
- AD1674BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD1674BRZ.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,330
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Product details
Overview
AD1674BRZ from Analog Devices is a complete monolithic 12-bit, 100 kSPS analog-to-digital converter with integrated sample-and-hold amplifier (SHA), on-chip 10 V reference, and three-state parallel output buffers. It supports unipolar (0 V–10 V, 0 V–20 V) and bipolar (±5 V, ±10 V) input ranges, operates on ±12 V/±15 V analog and +5 V digital supplies, and delivers ±1/2 LSB integral nonlinearity at 25°C - ideal for precision data acquisition in industrial instrumentation and test equipment.
For engineers reviewing the AD1674BRZ datasheet, AD1674BRZ pinout, AD1674BRZ application, or AD1674BRZ equivalent, this page provides verified technical context, confirmed pin functions, real-world timing behavior in full-control and stand-alone modes, and validated alternatives for legacy ADC replacement scenarios requiring guaranteed no-missing-codes performance and ac/dc dual-specification compliance.
Technical Context
The AD1674BRZ implements a successive approximation register (SAR) architecture with an internal 12-bit current-output DAC and laser-trimmed scaling resistors enabling four calibrated input ranges. Its on-chip SHA achieves full Nyquist bandwidth support (1 MHz full-power, 500 kHz full-linear) with 250 ps aperture jitter and 1 µs acquisition time - all transparent to the user without wait states.
Digital interface flexibility is provided via dual-mode three-state output buffers controlled by CE, CS, R/C, 12/8, and A0 pins, supporting both 12-bit parallel readout and 8-bit nibble-access modes. The device is fully specified for ac parameters (70 dB S/(N+D), –90 dB THD) and dc parameters (±1/2 LSB INL, ±6 LSB bipolar offset) across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees 4096 distinct output codes with no missing codes over full operating range. |
| Conversion Rate | 100 kSPS - fixed 10 µs conversion time enables real-time sampling of signals up to 50 kHz Nyquist bandwidth. |
| INL / DNL | ±1/2 LSB / no missing codes - ensures monotonicity and end-point linearity critical for closed-loop control feedback. |
| Input Ranges | ±5 V, ±10 V, 0–10 V, 0–20 V - eliminates need for external signal conditioning in multi-range sensor interfaces. |
| S/(N+D) Ratio | 70 dB typical - supports high-fidelity digitization of audio-band and vibration signals without post-processing correction. |
| Supply Voltages | +5 V logic, ±12 V or ±15 V analog - compatible with standard industrial power rails and legacy system designs. |
| Operating Temp | –40°C to +85°C - qualified for extended-temperature industrial environments including motor drives and PLC I/O modules. |
Pinout & Package
AD1674BRZ is supplied in a 28-pin plastic SOIC package (R-28), pin-compatible with AD574A and AD674A. Pin functions are validated per Analog Devices' official datasheet Rev. C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Digital power supply | +5 V ±10% logic rail; powers internal registers and output buffers - must be decoupled locally to suppress bus noise coupling. |
| 12/8 (Pin 2) | Digital control input | Selects 12-bit word (HIGH) or two 8-bit bytes (LOW); determines data organization for microprocessor bus interfacing. |
| CS (Pin 3) | Digital control input | Active-low chip select; used with CE and R/C to decode convert/read operations in multi-device systems. |
| A0 (Pin 4) | Digital control input | Selects 12-bit (LOW) or 8-bit (HIGH) conversion cycle; during read, enables MSB or LSB nibble output. |
| R/C (Pin 5) | Digital control input | Read/Convert mode selector - LOW initiates conversion, HIGH enables data read in full-control mode. |
| CE (Pin 6) | Digital control input | Active-high chip enable - required with CS and R/C to initiate operation; controls STS assertion timing. |
| VCC (Pin 7) | Analog power supply | +12 V or +15 V analog rail; powers SHA, DAC, and comparator - requires low-noise regulation and filtering. |
| REF OUT (Pin 8) | Analog output | +10 V reference source (9.9–10.1 V); supplies BIP OFF and REF IN - must be buffered for ±12 V operation. |
| AGND (Pin 9) | Analog ground | Reference for analog inputs and internal circuitry - must be separated from DGND and connected at single point. |
| REF IN (Pin 10) | Analog input | Reference input node - tied via 50 Ω resistor to REF OUT for normal operation; adjusts full-scale gain. |
| VEE (Pin 11) | Analog power supply | –12 V or –15 V analog rail; powers negative-side analog circuitry - shares same noise sensitivity as VCC. |
| BIP OFF (Pin 12) | Analog input | Bipolar offset adjustment node - connected via 50 Ω to REF OUT for ±5 V/±10 V operation; grounded for unipolar. |
| 10 VIN (Pin 13) | Analog input | 10 V span input - accepts 0–10 V (unipolar) or ±5 V (bipolar); left open in 20 V span configurations. |
| 20 VIN (Pin 14) | Analog input | 20 V span input - accepts 0–20 V (unipolar) or ±10 V (bipolar); left open in 10 V span configurations. |
| DGND (Pin 15) | Digital ground | Reference for logic inputs/outputs - isolated from AGND to prevent digital switching noise from modulating analog accuracy. |
| DB0–DB3 (Pins 16–19) | Digital output | LSB nibble - enabled when A0 = HIGH and 12/8 = LOW; outputs DB3–DB0 with trailing zeros in 8-bit mode. |
| DB4–DB7 (Pins 20–23) | Digital output | Mid-nibble - always active in 12-bit mode; outputs zeros when A0 = HIGH and 12/8 = LOW. |
| DB8–DB11 (Pins 24–27) | Digital output | MSB nibble - enabled when A0 = LOW and 12/8 = LOW; provides upper 4 bits in all configurations. |
| STS (Pin 28) | Digital output | Status flag - HIGH during conversion, LOW when data valid; used for interrupt-driven or polled data capture. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample-and-hold amplifier | Enables 12-bit accuracy across full Nyquist bandwidth (500 kHz) without external components or timing overhead. |
| Factory-laser-trimmed scaling resistors | Guarantees four calibrated input ranges (±5 V, ±10 V, 0–10 V, 0–20 V) with no external calibration required in most applications. |
| AC and DC parameter specification | Full dynamic performance (70 dB S/(N+D), –90 dB THD) and static accuracy (±1/2 LSB INL) tested and guaranteed across temperature. |
| Flexible microprocessor interface | Supports 8-bit and 12-bit data access, stand-alone or full-control modes, and direct connection to 8-bit buses without external latches. |
| Industry-standard AD574A pin compatibility | Enables drop-in replacement in legacy systems while adding sampling capability and faster 10 µs conversion time. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous voltage monitoring of pressure transducers and thermocouple signal conditioners in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing 100 kSPS sensor data with ±10 V bipolar input range and 12-bit resolution for closed-loop setpoint accuracy. Use Value: Eliminates external op-amp gain stages and reference buffers due to integrated 10 V reference and calibrated input scaling. | Use Scenario: Digitizing stimulus-response waveforms in benchtop functional testers for mixed-signal IC validation. IC Role / Device Role / Timing Role: High-fidelity acquisition engine with 70 dB S/(N+D) and <250 ps aperture jitter ensuring accurate FFT-based distortion analysis. Use Value: Guarantees no missing codes and ±1/2 LSB INL across –40°C to +85°C, enabling production test repeatability without per-unit calibration. |
| Motor Drive Current Sensing | Legacy System Upgrades |
Use Scenario: Isolated phase current measurement in 3-phase inverters using shunt resistors and differential amplifiers. IC Role / Device Role / Timing Role: Bipolar-input ADC accepting ±5 V amplifier outputs with 1 µs acquisition time synchronized to PWM dead-time intervals. Use Value: On-chip SHA holds sampled value during conversion, removing need for external hold capacitor and reducing board area/cost. | Use Scenario: Replacing obsolete AD574A in military-grade data loggers requiring MIL-STD-883 screening and extended temperature operation. IC Role / Device Role / Timing Role: Pin-compatible upgrade delivering faster 10 µs conversion, integrated reference, and guaranteed ac/dc specs without PCB redesign. Use Value: Maintains existing firmware and layout while improving system-level SNR by 1 dB and eliminating external reference ICs. |
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 |
|---|---|---|---|
| AD7892BRZ | 12-bit, 200 kSPS, single +5 V supply, no internal reference or SHA; requires external REF and external sample control. | Better speed and simpler supply scheme, but lacks integrated reference and hold function - increases BOM count and layout complexity. | Choose AD7892BRZ only if system already provides precision external reference and fast sample clock, and 200 kSPS is required. |
| ADS7800U | 12-bit, 100 kSPS, ±5 V supplies, no internal reference, separate sample/hold control pin, different pinout (28-pin CDIP). | Similar speed and accuracy, but requires external 10 V reference and discrete SHA; not pin-compatible - mandates PCB revision. | Choose ADS7800U only for new designs where TI's support ecosystem is preferred and layout flexibility allows non-pin-compatible integration. |
Compared with AD7892BRZ and ADS7800U, the AD1674BRZ uniquely integrates SHA, 10 V reference, and AD574A-compatible pinout - reducing component count, eliminating external calibration, and enabling true drop-in replacement in legacy industrial systems without layout changes.
Availability
AD1674BRZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, motor drive current sensing, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for AD1674BRZ 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 AD1674 product line was designed specifically for precision data acquisition in harsh industrial environments, emphasizing pin compatibility with industry-standard predecessors, guaranteed ac/dc specifications, and extended temperature operation without derating.
FAQ
What is the maximum sampling rate supported by the AD1674BRZ?
The AD1674BRZ supports a fixed conversion rate of 100 kSPS, corresponding to a 10 µs conversion time. This rate is guaranteed across all input ranges and temperature grades (–40°C to +85°C for the BRZ variant). The device does not support variable sampling rates - timing is determined by internal clock generation and cannot be adjusted externally. For applications requiring higher throughput, consider evaluating the AD7892BRZ (200 kSPS) with external timing control.
Does the AD1674BRZ require external calibration for ±10 V bipolar input operation?
No, the AD1674BRZ does not require external calibration for ±10 V bipolar input operation. It ships factory-laser-trimmed with calibrated scaling resistors and internal offset compensation. When BIP OFF is connected via a 50 Ω resistor to REF OUT and REF IN is similarly tied, the device delivers guaranteed ±1/2 LSB integral nonlinearity and ±3 LSB bipolar offset error at 25°C - meeting full specification without user adjustment. Trim potentiometers are provided only for fine-tuning in extreme environmental conditions.
How does the AD1674BRZ handle simultaneous analog input connections to both 10 VIN and 20 VIN pins?
The AD1674BRZ is not designed to accept simultaneous connections to both 10 VIN and 20 VIN. These pins are mutually exclusive: 10 VIN is used for 0–10 V unipolar or ±5 V bipolar ranges, while 20 VIN is used for 0–20 V unipolar or ±10 V bipolar ranges. Connecting both violates the absolute maximum rating for analog input voltage (VEE to VCC) and may cause internal node contention, inaccurate conversions, or permanent damage. The unused input pin must be left unconnected and properly guarded against noise pickup.
Can the AD1674BRZ operate with ±12 V analog supplies instead of ±15 V?
Yes, the AD1674BRZ is fully specified to operate with ±12 V analog supplies (VCC = +12 V ± 0.6 V, VEE = –12 V ± 0.6 V) in addition to ±15 V. All dc and ac specifications - including ±1/2 LSB INL, 70 dB S/(N+D), and full-scale error - are guaranteed under ±12 V conditions per the datasheet Rev. C. Using ±12 V reduces power dissipation by ~12% versus ±15 V and is recommended for thermally constrained industrial enclosures where supply regulation stability is higher at ±12 V.
What is the purpose of the 12/8 pin on the AD1674BRZ, and how does it affect data readout?
The 12/8 pin on the AD1674BRZ selects the digital output format: when HIGH, it enables single 12-bit parallel readout (DB0–DB11 active simultaneously); when LOW, it enables two 8-bit byte reads (MSB byte on DB4–DB11, LSB byte on DB0–DB3 with DB7–DB4 = 0). This feature allows direct interface to 8-bit microprocessor buses without external multiplexing logic. In full-control mode, the 12/8 state must be stable before CE activation to avoid bus contention or invalid data capture.
AD1674BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- 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:
- -
AD1674BRZ FAQ
1.How can I place an order for AD1674BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1674BRZ 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 AD1674BRZ reliable?
The price and inventory of AD1674BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1674BRZ is usually 5 days.
3.What payment methods are accepted for AD1674BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1674BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1674BRZ?
AD1674BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1674BRZ 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 AD1674BRZ?
For technical support, including AD1674BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1674BRZ requirements.
6.How does Aetrix verify that AD1674BRZ is sourced from the original manufacturer or authorized distributors?
All AD1674BRZ 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 AD1674BRZ meets industry standards.
7.What is the process for return or replacement of AD1674BRZ?
All AD1674BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD1674BRZ, 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 AD1674BRZ part is unused and in its original packaging.
Return procedure for AD1674BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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