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Analog Devices Inc. AD1674AR
- Part No.:
- AD1674AR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD1674AR.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,763
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Product details
Overview
AD1674AR 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 digital interface. 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 logic supplies, and delivers ±1 LSB integral nonlinearity at –40°C to +85°C. It is used in precision data acquisition systems requiring DC accuracy and AC performance such as automated test equipment and industrial process monitoring.
For engineers reviewing the AD1674AR datasheet, AD1674AR pinout, AD1674AR application, or AD1674AR equivalent, key selection considerations include its 12-bit resolution with no missing codes, full Nyquist-bandwidth SHA, guaranteed AC specs (70 dB S/(N+D), –90 dB THD), flexible 8-/12-bit microprocessor interface, and plastic SOIC-28 packaging for industrial temperature operation.
Technical Context
The AD1674AR implements a successive approximation register (SAR) architecture with an integrated, user-transparent SHA that acquires to 12-bit accuracy within 1 µs and supports full Nyquist bandwidth sampling. Its internal 10 V reference (9.9–10.1 V) feeds a precision laser-trimmed resistor network enabling four calibrated input ranges without external components.
Digital interface logic supports both full-control mode (using CE, CS, R/C, 12/8, A0) and stand-alone mode (R/C-triggered), with configurable 8-bit or 12-bit parallel output via three-state buffers. Conversion timing is deterministic: 10 µs for 12-bit, 8 µs for 8-bit, with STS status flag and precise aperture delay (50 ns) and jitter (250 ps) specified for dynamic applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees 4096 distinct output codes with no missing codes across full operating range. |
| Sampling Rate | 100 kSPS - enables real-time capture of signals up to 50 kHz (Nyquist limit) with full 12-bit accuracy. |
| INL / DNL | ±1 LSB / No Missing Codes - ensures monotonic transfer function and ≤0.024% full-scale linearity error for precision measurement. |
| S/(N+D) Ratio | 69 dB (min) - corresponds to ~11.5 effective bits at 10 kHz input, validated under AC testing per FFT methodology. |
| Input Ranges | ±5 V, ±10 V, 0–10 V, 0–20 V - selectable via BIP OFF and input pin routing; no external scaling required. |
| Supply Voltages | +5 V (VLOGIC), ±12 V or ±15 V (VCC/VEE) - dual-supply analog section isolates noise-sensitive conversion from digital logic. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments; includes tempco specs for offset (±2 LSB) and full-scale (±8 LSB). |
Pinout & Package
AD1674AR is housed in a 28-lead plastic SOIC (R-28) package with standard industry pinout compatible with AD574A/AD674A. Pin functions are electrically and mechanically validated per Analog Devices' official pin description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Logic Power Supply | +5 V supply for internal digital logic and output buffers; decoupling required near pin. |
| 12/8 (Pin 2) | Digital Format Control | LOW selects two 8-bit read cycles; HIGH enables single 12-bit parallel output. |
| CS (Pin 3) | Chip Select Input | Active LOW; enables device decoding in multi-peripheral bus systems. |
| A0 (Pin 4) | Byte Address / Cycle Length | LOW initiates 12-bit conversion; HIGH triggers 8-bit cycle; during read, selects MSB or LSB nybble. |
| R/C (Pin 5) | Read/Convert Control | LOW = start conversion; HIGH = enable data read; edge-triggered in stand-alone mode. |
| CE (Pin 6) | Chip Enable Input | Active HIGH; initiates convert or read when CS is LOW; synchronizes internal control logic. |
| VCC (Pin 7) | Positive Analog Supply | +12 V or +15 V analog rail; powers SHA, reference, and comparator; requires local filtering. |
| REF OUT (Pin 8) | Analog Reference Output | +10 V buffered reference (2 mA drive); connects to REF IN via 50 Ω for calibration or BIP OFF for bipolar offset. |
| AGND (Pin 9) | Analog Ground | Reference return for analog inputs, reference, and SHA; must be separated from DGND at single point. |
| REF IN (Pin 10) | Reference Input | Accepts 50 Ω-terminated REF OUT for internal reference use; open or grounded for external reference. |
| VEE (Pin 11) | Negative Analog Supply | –12 V or –15 V rail; powers analog front-end; critical for bipolar input range integrity. |
| BIP OFF (Pin 12) | Bipolar Offset Calibration | Connect to REF OUT via 50 Ω for ±5 V/±10 V modes; tie to AGND for unipolar operation. |
| 10 VIN (Pin 13) | 10 V Span Analog Input | Accepts 0–10 V (unipolar) or ±5 V (bipolar); unused in 20 V span mode. |
| 20 VIN (Pin 14) | 20 V Span Analog Input | Accepts 0–20 V (unipolar) or ±10 V (bipolar); unused in 10 V span mode. |
| DGND (Pin 15) | Digital Ground | Return for logic outputs and VLOGIC; isolated from AGND to prevent digital noise coupling. |
| DB0–DB3 (Pins 16–19) | Data Output (LSB Nybble) | Lower 4 bits of 12-bit result; enabled during read when A0=HIGH and 12/8=LOW. |
| DB4–DB7 (Pins 20–23) | Data Output (Mid Nybble) | Middle 4 bits; always active in 12-bit mode; zero-padded in 8-bit LSB read mode. |
| DB8–DB11 (Pins 24–27) | Data Output (MSB Nybble) | Upper 4 bits; enabled when A0=LOW in 8-bit mode or always in 12-bit mode. |
| STS (Pin 28) | Status Output | Active HIGH during conversion; goes LOW 0.6–1.2 µs after data valid-used for handshaking or interrupt generation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Sample-and-Hold Amplifier | Supports full Nyquist bandwidth (50 kHz) with 1 µs acquisition time; eliminates need for external SHA and reduces board space. |
| Factory-Calibrated Input Ranges | Four laser-trimmed ranges (±5 V, ±10 V, 0–10 V, 0–20 V) require no external resistors or recalibration in most applications. |
| AC + DC Performance Guarantee | Specified for S/(N+D) (69 dB), THD (–90 dB), and IMD across temperature-enables mixed-signal validation without additional characterization. |
| Flexible Microprocessor Interface | Configurable 8-/12-bit parallel output with three-state buffers allows direct connection to 8-bit or 16-bit buses without glue logic. |
| Industry-Standard Pin Compatibility | Pins match AD574A/AD674A footprint-enables drop-in upgrade path with improved sampling and AC specs. |
Applications
| Automated Test Equipment (ATE) | Industrial Process Monitoring |
|---|---|
Use Scenario: High-accuracy voltage/current measurements during functional testing of PCBAs and semiconductor devices. IC Role / Device Role / Timing Role: Primary ADC capturing sensor and DUT output signals at 100 kSPS with guaranteed 12-bit linearity and low THD. Use Value: Eliminates external calibration due to factory-trimmed ranges and ±1 LSB INL, reducing test setup time and improving repeatability. | Use Scenario: Continuous monitoring of temperature, pressure, and flow transducers in PLC-based control cabinets. IC Role / Device Role / Timing Role: Precision analog front-end digitizing 4–20 mA loop signals conditioned to ±10 V or 0–10 V ranges. Use Value: Industrial temperature grade (–40°C to +85°C) and robust power supply rejection (±2 LSB) ensure stable operation in electrically noisy cabinet environments. |
| Medical Instrumentation | Power Quality Analyzers |
Use Scenario: Digitizing ECG, EEG, and patient vital sign waveforms requiring low noise and high fidelity. IC Role / Device Role / Timing Role: Signal-chain ADC providing 69 dB S/(N+D) and <250 ps aperture jitter for clean waveform reconstruction. Use Value: Integrated SHA and guaranteed AC specs eliminate need for external anti-aliasing filters beyond basic RC, simplifying FDA-critical signal chain design. | Use Scenario: Capturing voltage and current waveforms for harmonic analysis and RMS calculation in grid-connected inverters. IC Role / Device Role / Timing Role: Simultaneous sampling ADC supporting full-linear bandwidth (500 kHz) and intermodulation distortion testing (IMD). Use Value: Validated IMD performance (–90 dB second/third order) enables accurate detection of sub-1% harmonic distortion in 50/60 Hz systems. |
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 |
|---|---|---|---|
| AD1674BR | Same package and pinout; ±1/2 LSB INL (vs. ±1 LSB) and 70 dB S/(N+D) (vs. 69 dB). | Preferred where higher DC accuracy and marginally better AC performance are required in same industrial temp range. | Select AD1674BR if system-level linearity budget demands <0.5 LSB error or THD must exceed –90 dB consistently. |
| AD7892BR-1 | 12-bit, 100 kSPS SAR ADC in 28-lead SOIC; no internal reference or SHA; requires external REF and external sample control. | Used where board space allows discrete reference/SHA and design flexibility outweighs integration benefit. | Choose AD7892BR-1 only if external component selection is preferred for cost optimization or custom reference voltage requirements. |
Compared with AD1674BR, the AD1674AR trades 0.5 LSB INL and 1 dB S/(N+D) for lower unit cost while retaining identical timing, interface, and thermal specs; versus AD7892BR-1, it delivers full signal-chain integration (SHA + REF) at the expense of slightly higher BOM count in reference-flexible designs.
Availability
AD1674AR is available at Aetrix Electronics and suitable for automated test equipment, industrial process monitoring, and medical instrumentation requiring stable component supply across extended temperature operation and long production lifecycles.
Supply support for AD1674AR 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 AD1674 product line was designed as a pin-compatible, performance-enhanced successor to the AD574A/AD674A family-targeting industrial and test equipment applications demanding integrated signal conditioning, guaranteed AC/DC specs, and reliable operation across wide temperature ranges.
FAQ
What is the maximum sampling rate of the AD1674AR?
The AD1674AR achieves a maximum sampling rate of 100 kSPS with guaranteed 12-bit accuracy. Its 10 µs conversion time for full 12-bit cycles and deterministic timing (including STS flag assertion and data validity windows) make it suitable for real-time acquisition in closed-loop control and waveform capture applications. This rate is maintained across its full industrial temperature range (–40°C to +85°C) and all supported input ranges.
Does the AD1674AR require external calibration for ±10 V bipolar operation?
No, the AD1674AR does not require external calibration for ±10 V bipolar operation. Its factory-laser-trimmed resistor network and internal 10 V reference provide calibrated operation across all four input ranges-including ±10 V-when BIP OFF is connected to REF OUT via a 50 Ω resistor. The datasheet specifies unipolar and bipolar offset errors (±2 LSB and ±6 LSB, respectively) at +25°C, with defined temperature drift, eliminating need for field calibration in most industrial deployments.
How does the AD1674AR handle 8-bit versus 12-bit data reads?
The AD1674AR supports both 8-bit and 12-bit data reads via the 12/8 and A0 control pins. When 12/8 is HIGH, DB0–DB11 output a single 12-bit word. When 12/8 is LOW, two 8-bit reads are required: A0 LOW enables DB4–DB11 (upper byte), and A0 HIGH enables DB0–DB3 (lower byte, padded with four trailing zeros). This dual-mode interface allows seamless integration with 8-bit microcontrollers without external latches or bus transceivers.
Can the AD1674AR operate with ±12 V analog supplies instead of ±15 V?
Yes, the AD1674AR is fully specified to operate with either ±12 V or ±15 V analog supplies (VCC and VEE). Its absolute maximum ratings allow VCC up to +16.5 V and VEE down to –16.5 V, and DC/AC specifications-including INL, S/(N+D), and full-scale error-are guaranteed over the full operating range of +11.4 V to +16.5 V (VCC) and –16.5 V to –11.4 V (VEE). Using ±12 V simplifies power supply design while maintaining full performance.
What is the purpose of the STS pin on the AD1674AR?
STS (Status) is an active-HIGH open-drain output that signals conversion progress: it goes HIGH at conversion start and returns LOW 0.6–1.2 µs after data becomes valid on DB0–DB11. This precise timing enables hardware handshaking-e.g., triggering an interrupt or enabling a latch-without polling. Its guaranteed delay and setup/hold margins ensure reliable synchronization with microprocessor read cycles in both full-control and stand-alone modes.
AD1674AR 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):
- 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:
- -
AD1674AR FAQ
1.How can I place an order for AD1674AR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1674AR 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 AD1674AR reliable?
The price and inventory of AD1674AR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1674AR is usually 5 days.
3.What payment methods are accepted for AD1674AR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1674AR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1674AR?
AD1674AR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1674AR 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 AD1674AR?
For technical support, including AD1674AR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1674AR requirements.
6.How does Aetrix verify that AD1674AR is sourced from the original manufacturer or authorized distributors?
All AD1674AR 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 AD1674AR meets industry standards.
7.What is the process for return or replacement of AD1674AR?
All AD1674AR units undergo pre-shipment inspection (PSI). If there is an issue with AD1674AR, 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 AD1674AR part is unused and in its original packaging.
Return procedure for AD1674AR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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