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Analog Devices Inc. AD7274BUJ-500RL7
- Part No.:
- AD7274BUJ-500RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
AD7274BUJ-500RL7.pdf
- Description:
- IC ADC 12BIT 3MSPS TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:332
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Product details
Overview
AD7274BUJ-500RL7 from Analog Devices is a 12-bit, 3 MSPS successive approximation ADC in an 8-lead TSOT package, operating from 2.35 V to 3.6 V supply. It delivers 69.5 dB SNR at 1 MHz input, supports external reference from 1.4 V to VDD, and features no pipeline delay for deterministic timing in high-speed data acquisition systems.
For engineers reviewing the AD7274BUJ-500RL7 datasheet, AD7274BUJ-500RL7 pinout, AD7274BUJ-500RL7 application, or AD7274BUJ-500RL7 equivalent, this device is selected for precision, low-latency sampling in battery-powered instrumentation, motor control feedback loops, and industrial sensor interfaces where 12-bit resolution and 3 MSPS throughput are required within tight power and board space constraints.
Technical Context
The AD7274BUJ-500RL7 implements a charge redistribution DAC-based successive approximation architecture with on-chip track-and-hold, enabling full-power bandwidth of 55 MHz and aperture jitter of 18 ps typ. Conversion is initiated by the falling edge of CS and clocked by SCLK up to 48 MHz, requiring exactly 14 SCLK cycles per 12-bit result.
It uses a single-supply analog front end with separate AGND and DGND pins, accepts 0 V to VREF unipolar input, and supports SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface with MSB-first output format (two leading zeros + 12 data bits + two trailing zeros).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees monotonic transfer function with no missing codes over full temperature range. |
| Throughput Rate | 3 MSPS - maximum sustained sampling rate with 14-cycle serial readout at 48 MHz SCLK. |
| SNR @ 1 MHz | 69.5 dB min - enables >11.2 ENOB for high-fidelity signal capture in narrowband applications. |
| Power Consumption | 11.4 mW typ at 3 V - achieves 3.8 mA operational current, critical for portable and thermally constrained designs. |
| Input Voltage Range | 0 V to VREF - requires externally supplied reference between 1.4 V and VDD for full-scale flexibility. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, industrial PLC, and harsh-environment sensing. |
| Aperture Jitter | 18 ps typ - limits sampling uncertainty to <0.02 LSB at 10 MHz input, preserving dynamic performance. |
Pinout & Package
AD7274BUJ-500RL7 is housed in an 8-lead TSOT (Thin Small Outline Transistor) package, 3 mm × 1.7 mm × 0.8 mm, lead pitch 0.5 mm, RoHS-compliant and moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power Supply Input | Single 2.35–3.6 V supply powering analog and digital sections; decoupling capacitor required near pin. |
| SDATA (Pin 2) | Serial Data Output | Three-state CMOS output delivering 12-bit conversion result MSB-first with framing zeros; driven only during active CS. |
| CS (Pin 3) | Chip Select | Active-low input initiating sample acquisition on falling edge and framing serial data transfer; defines conversion start instant. |
| AGND (Pin 4) | Analog Ground Reference | Return path for VIN, VREF, and internal analog circuitry; must be tied to low-impedance ground plane, isolated from DGND except at single point. |
| VREF (Pin 5) | External Reference Input | Accepts 1.4–VDD reference voltage; requires 10 μF capacitor to AGND for noise suppression and stability. |
| SCLK (Pin 6) | Serial Clock Input | Provides clock for both data readout and internal SAR conversion; supports up to 48 MHz with 40/60 duty cycle tolerance. |
| DGND (Pin 7) | Digital Ground Reference | Return path for CS, SCLK, SDATA; must remain within 0.3 V of AGND potential to prevent digital noise coupling into analog path. |
| VIN (Pin 8) | Analog Input Channel | Single-ended input with 42 pF track capacitance; full-scale range defined by VREF; requires low-impedance source for ≤60 ns acquisition time. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic, single-cycle latency from CS assertion to valid data-critical for closed-loop real-time control. |
| Flexible reference range (1.4 V to VDD) | Allows use of low-noise bandgap references or regulated supply rails, maximizing dynamic range without external scaling. |
| Full power-down mode (0.1 μA typ) | Reduces quiescent current by >99.9% between conversions, extending battery life in intermittent-sampling applications. |
| Wide input bandwidth (55 MHz @ 3 dB) | Supports accurate digitization of fast transients and wideband signals without external anti-alias filtering in many cases. |
| SPI/QSPI/MICROWIRE/DSP compatibility | Integrates seamlessly with common microcontrollers and DSPs without protocol translation or glue logic. |
Applications
| Motor Control Feedback | Portable Instrumentation |
|---|---|
Use Scenario: Real-time sampling of phase currents and back-EMF in BLDC motor drives operating at 20 kHz PWM frequency. IC Role / Device Role / Timing Role: High-speed, low-latency ADC capturing current sense waveforms synchronized to PWM edges via precise CS-triggered acquisition. Use Value: Enables field-oriented control with <60 ns acquisition time and 12-bit resolution, reducing torque ripple and improving efficiency at partial load. |
Use Scenario: Battery-powered handheld oscilloscope capturing transient signals up to 5 MHz with 12-bit fidelity. IC Role / Device Role / Timing Role: Primary analog-to-digital converter interfacing directly to front-end amplifier, delivering 3 MSPS samples to embedded ARM processor via SPI. Use Value: Delivers 69.5 dB SNR at 1 MHz while consuming only 11.4 mW, extending runtime beyond 8 hours on a single Li-ion cell. |
| Industrial Sensor Interface | Automotive Onboard Diagnostics |
Use Scenario: Digitizing outputs from strain gauges, RTDs, and pressure sensors in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Precision SAR ADC with external reference support, operating across −40°C to +125°C with guaranteed no-missed-codes behavior. Use Value: Provides ±1 LSB INL and ±1 LSB DNL over full temperature range, eliminating calibration drift in unattended factory-floor deployments. |
Use Scenario: Sampling engine knock sensor signals and exhaust gas oxygen (EGO) sensor outputs in OBD-II compliant ECUs. IC Role / Device Role / Timing Role: High-reliability ADC meeting AEC-Q100 Grade 1 requirements, performing deterministic sampling triggered by crankshaft position events. Use Value: Achieves 70 dB PSRR and 18 ps aperture jitter, rejecting ignition noise and preserving signal integrity for accurate misfire detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7274BRMZ-REEL | Same 12-bit/3 MSPS specs but in 8-lead MSOP package; thermal resistance θJA = 205.9°C/W vs. TSOT's 230°C/W. | Better thermal performance in high-density layouts; larger footprint may conflict with ultra-compact designs. | Select AD7274BRMZ-REEL when board layout allows MSOP and thermal management is prioritized over size. |
| ADS7953IRHBT | 12-bit, 1 MSPS, 16-channel SAR ADC with integrated sequencer and GPIO; higher power (14 mW), wider supply (2.7–5.25 V). | Multi-channel scanning capability eliminates need for external MUX; lower throughput limits high-frequency signal capture. | Select ADS7953IRHBT when system requires simultaneous monitoring of multiple sensors and can trade speed for integration. |
Compared with AD7274BRMZ-REEL, AD7274BUJ-500RL7 offers superior board-area efficiency in space-constrained applications; compared with ADS7953IRHBT, it provides 3× higher throughput and lower latency but requires external channel selection for multi-signal systems.
Availability
AD7274BUJ-500RL7 is available at Aetrix Electronics and suitable for motor control feedback, portable instrumentation, industrial sensor interface, and automotive onboard diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7274BUJ-500RL7 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, headquartered in Norwood, MA, with design and manufacturing expertise spanning over five decades.
The AD7273/AD7274 product line was engineered for high-speed, low-power data acquisition in space- and energy-constrained embedded systems, targeting applications demanding deterministic latency, wide input bandwidth, and robust operation from −40°C to +125°C.
FAQ
What is the minimum SCLK frequency required for guaranteed specifications of the AD7274BUJ-500RL7?
The AD7274BUJ-500RL7 requires a minimum SCLK frequency of 500 kHz to meet all AC and DC specifications across temperature. At lower frequencies, timing margins for tQUIET, tCONVERT, and data hold may be violated, potentially causing read errors or reduced dynamic performance. The part remains functional below 500 kHz but is not characterized for guaranteed operation.
Does the AD7274BUJ-500RL7 require an external reference, and what is its acceptable voltage range?
Yes, the AD7274BUJ-500RL7 requires an external reference applied to the VREF pin. The specified input voltage range is 1.4 V to VDD, allowing direct use of the supply rail or a precision low-drift reference. Operation outside this range risks degraded linearity, increased offset error, or failure to meet guaranteed INL/DNL specs.
How does the AD7274BUJ-500RL7 handle power-down modes, and what is the typical current in full power-down?
The AD7274BUJ-500RL7 supports full power-down mode activated via the serial interface, reducing IDD to 0.1 μA typical at −40°C to +85°C and 10 μA maximum at 85°C to +125°C. This state disables the track-and-hold, reference buffer, and digital core, retaining only leakage paths-ideal for battery-powered wake-on-event architectures.
Can the AD7274BUJ-500RL7 interface directly with a 1.8 V microcontroller SPI port?
No-the AD7274BUJ-500RL7 logic inputs require VIH ≥ 1.7 V at VDD = 2.35–2.7 V and ≥2.0 V at VDD = 2.7–3.6 V; its outputs drive VOH ≥ VDD − 0.2 V. A 1.8 V MCU cannot reliably drive CS or SCLK, nor read SDATA, without level translation. Direct interface is only safe with 2.5 V or higher I/O domains.
What is the acquisition time requirement for the AD7274BUJ-500RL7, and how does it affect external driver design?
The AD7274BUJ-500RL7 specifies a maximum track-and-hold acquisition time of 60 ns. To meet this, the driving amplifier must settle to ±0.5 LSB (≈1.2 mV for 3 V VREF) within that window. This typically requires a unity-gain-stable op amp with >50 MHz GBW and low output impedance (<50 Ω) to drive the 42 pF input capacitance without ringing or overshoot.
AD7274BUJ-500RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 3M
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- SPI, DSP
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- TSOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7274BUJ-500RL7 FAQ
1.How can I place an order for AD7274BUJ-500RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7274BUJ-500RL7 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 AD7274BUJ-500RL7 reliable?
The price and inventory of AD7274BUJ-500RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7274BUJ-500RL7 is usually 5 days.
3.What payment methods are accepted for AD7274BUJ-500RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7274BUJ-500RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7274BUJ-500RL7?
AD7274BUJ-500RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7274BUJ-500RL7 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 AD7274BUJ-500RL7?
For technical support, including AD7274BUJ-500RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7274BUJ-500RL7 requirements.
6.How does Aetrix verify that AD7274BUJ-500RL7 is sourced from the original manufacturer or authorized distributors?
All AD7274BUJ-500RL7 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 AD7274BUJ-500RL7 meets industry standards.
7.What is the process for return or replacement of AD7274BUJ-500RL7?
All AD7274BUJ-500RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7274BUJ-500RL7, 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 AD7274BUJ-500RL7 part is unused and in its original packaging.
Return procedure for AD7274BUJ-500RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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