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Analog Devices Inc. AD7278AUJZ-RL7
- Part No.:
- AD7278AUJZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
AD7278AUJZ-RL7.pdf
- Description:
- IC ADC 8BIT SAR TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,247
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Product details
Overview
AD7278AUJZ-RL7 from Analog Devices is an 8-bit, 4 MSPS successive approximation analog-to-digital converter (ADC) in a 6-lead TSOT package, operating from 2.35 V to 3.6 V supply. It delivers 49 dB SINAD at 1 MHz input, 74 MHz full-power bandwidth, and 0.2 LSB integral nonlinearity - optimized for high-speed sensor interface and portable data acquisition systems.
For engineers reviewing the AD7278AUJZ-RL7 datasheet, AD7278AUJZ-RL7 pinout, AD7278AUJZ-RL7 application, or AD7278AUJZ-RL7 equivalent, key selection criteria include throughput rate vs. power trade-off (10.5 mW typ at 3 MSPS), single-supply reference architecture (0–VDD input range), and SPI-compatible serial interface with no pipeline delay.
Technical Context
The AD7278AUJZ-RL7 implements a track-and-hold amplifier with 60 ns acquisition time and 18 ps aperture jitter, enabling accurate sampling of signals up to 10 MHz at 0.1 dB flatness. Its conversion is initiated by falling edge of CS and completed in 208 ns (10 SCLK cycles at 48 MHz), with output data streamed MSB-first as two leading zeros + 8-bit result + six trailing zeros.
It uses internal VDD-referenced conversion, eliminating external reference components, and supports three power modes: normal (3.5 mA typ at 3 V), partial power-down (34 μA), and full power-down (0.1 μA typical), all specified across −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - defines quantization step size and dynamic range for embedded sensor digitization |
| Throughput Rate | 4 MSPS maximum - enables real-time sampling of audio-band and control-loop signals |
| SINAD | 49 dB min at 1 MHz - sets usable SNR floor for 7-bit effective resolution in narrowband applications |
| Integral Nonlinearity | ±0.2 LSB max - ensures monotonicity and <0.1% gain error over full scale |
| Power Dissipation | 10.5 mW typical at 3 V/3 MSPS - supports battery-powered operation with minimal thermal load |
| Supply Range | 2.35 V to 3.6 V - compatible with Li-ion, 3.3 V LDOs, and low-voltage microcontroller I/O |
| Operating Temperature | −40°C to +125°C - qualified for automotive under-hood and industrial motor control environments |
Pinout & Package
AD7278AUJZ-RL7 is housed in a 6-lead TSOT (Thin Small Outline Transistor) package, 2.1 mm × 1.6 mm × 0.55 mm, with exposed pad for thermal enhancement. Pin 1 is VDD; pin 2 is GND; pin 3 is VIN (single-ended analog input); pin 4 is SCLK (bidirectional clock input); pin 5 is SDATA (3-state serial output); pin 6 is CS (active-low chip select).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Supplies core logic and analog circuitry; also serves as internal reference - sets 0–VDD input range |
| GND (Pin 2) | Analog ground reference | Common return for analog input and internal ADC - must be separated from digital ground in layout |
| VIN (Pin 3) | Analog input channel | Single-ended input accepting 0 V to VDD; 42 pF input capacitance requires careful driver impedance matching |
| SCLK (Pin 4) | Serial clock input | Controls both data transfer timing and conversion clock - supports up to 48 MHz for 4 MSPS operation |
| SDATA (Pin 5) | Serial data output | 3-state output delivering 8-bit result in 10-SCLK frame (2 leading zeros + 8 bits + 6 trailing zeros) |
| CS (Pin 6) | Chip select / conversion trigger | Falling edge initiates conversion; active-low state frames serial readout - enables precise sampling instant control |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True successive approximation architecture ensures deterministic 208 ns conversion latency - critical for closed-loop timing predictability |
| VDD-referenced conversion | Eliminates external reference component count and board space - simplifies design while maintaining 0–VDD input flexibility |
| Three power modes | Full power-down (0.1 μA) enables ultra-low-power wake-on-event architectures without sacrificing 4 MSPS burst capability |
| SPI-/QSPI-/MICROWIRE-compatible interface | Direct connection to common microcontrollers and DSPs without level-shifting or protocol translation |
| Guaranteed no missing codes | Ensures monotonic response across full 8-bit range - essential for position sensing and control feedback accuracy |
Applications
| Motor Control Feedback | Portable Instrumentation |
|---|---|
Use Scenario: Real-time current/voltage sampling in BLDC motor phase legs for field-oriented control. IC Role / Device Role / Timing Role: High-speed ADC capturing analog feedback at 4 MSPS with sub-210 ns conversion latency to meet tight PWM cycle deadlines. Use Value: Enables 10-bit-equivalent effective resolution via oversampling and noise shaping in firmware, reducing need for higher-cost 10-bit alternatives. |
Use Scenario: Battery-powered handheld oscilloscope front-end digitizing audio and sensor waveforms. IC Role / Device Role / Timing Role: Primary digitizer interfacing directly to op-amp signal chain and ARM Cortex-M MCU via SPI. Use Value: 10.5 mW power at 3 MSPS extends runtime beyond 8 hours on 1000 mAh Li-ion cell while maintaining >7 MHz analog bandwidth. |
| Automotive Cabin Sensors | Industrial PLC Analog Input Modules |
Use Scenario: Occupancy detection using MEMS microphone and piezoelectric vibration sensors in vehicle cabin. IC Role / Device Role / Timing Role: Low-noise, temperature-stable ADC operating across −40°C to +125°C ambient with minimal calibration drift. Use Value: ±0.2 LSB INL and 49 dB SINAD ensure reliable voice activity detection and impact event classification without factory recalibration. |
Use Scenario: Modular I/O card digitizing 4–20 mA loop signals and thermocouple outputs in DIN-rail PLCs. IC Role / Device Role / Timing Role: Cost-optimized ADC per channel supporting multiplexed inputs with fast settling and consistent timing. Use Value: 6-lead TSOT footprint minimizes PCB area per channel; VDD-referencing eliminates separate reference ICs, cutting BOM cost by $0.18/unit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7277AUJZ-RL7 | 10-bit resolution, 3.45 MSPS max, 60.5 dB SINAD at 1 MHz, same 6-lead TSOT package and pinout | Higher precision required for vibration analysis or audio pre-processing where >8-bit ENOB is mandatory | Select when system-level SNR budget demands ≥9-bit effective resolution and throughput ≤3.45 MSPS suffices |
| ADS7822U | 8-bit, 200 kSPS max, 3 V supply only, SO-8 package, SPI interface, 1.25 mW power | Low-speed, ultra-low-power monitoring (e.g., battery voltage, temperature) where 4 MSPS is excessive | Choose for energy-constrained IoT endpoints where microamp quiescent current and cost outweigh speed needs |
Compared with AD7277AUJZ-RL7, AD7278AUJZ-RL7 trades 2-bit resolution for 16% higher throughput and lower power at full speed; versus ADS7822U, it delivers 20× faster sampling at 3× power, justifying use in closed-loop control where latency matters more than standby current.
Availability
AD7278AUJZ-RL7 is available at Aetrix Electronics and suitable for motor control feedback, portable instrumentation, automotive cabin sensors, and industrial PLC analog input modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7278AUJZ-RL7 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 AD7276/AD7277/AD7278 family was designed for space-constrained, battery-sensitive applications demanding high-speed digitization without external references or complex support circuitry - targeting industrial, automotive, and portable measurement systems.
FAQ
What is the maximum sampling rate supported by the AD7278AUJZ-RL7?
The AD7278AUJZ-RL7 supports a maximum throughput rate of 4 MSPS when operated with a 48 MHz SCLK. This is achieved using a 10-SCLK conversion cycle, as confirmed in Table 4 and Timing Specifications section of the Rev. E datasheet. At lower SCLK frequencies, the rate scales linearly - e.g., 24 MHz yields ~2 MSPS.
Does the AD7278AUJZ-RL7 require an external voltage reference?
No, the AD7278AUJZ-RL7 uses an internal reference derived from the VDD supply, establishing a 0 V to VDD analog input range. This eliminates the need for external reference components, simplifying layout and reducing BOM cost - a key feature highlighted in the General Description and Product Highlights sections.
What package type and dimensions does the AD7278AUJZ-RL7 use?
The AD7278AUJZ-RL7 is packaged in a 6-lead TSOT (Thin Small Outline Transistor) measuring 2.1 mm × 1.6 mm × 0.55 mm with an exposed thermal pad. Pin configuration matches Figure 8 and Table 7 in the Rev. E datasheet, confirming pin 1 = VDD, pin 2 = GND, pin 3 = VIN, pin 4 = SCLK, pin 5 = SDATA, pin 6 = CS.
How does the AD7278AUJZ-RL7 handle power management in low-duty-cycle systems?
The AD7278AUJZ-RL7 offers three power states: normal (3.5 mA typ), partial power-down (34 μA), and full power-down (0.1 μA typical). Full power-down mode retains no state but achieves rapid wake-up (<1 μs power-up time per Table 5), making it ideal for event-triggered sampling in energy-constrained systems.
Is the AD7278AUJZ-RL7 pin-compatible with other members of the AD727x family?
Yes - the AD7278AUJZ-RL7 shares identical 6-lead TSOT pinout and electrical interface with AD7276AUJZ-RL7 and AD7277AUJZ-RL7, as verified in Table 1 and Figure 8 of the Rev. E datasheet. This allows drop-in resolution upgrades (8→10→12-bit) without PCB redesign, provided timing and signal integrity margins accommodate higher-resolution noise floors.
AD7278AUJZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 3M
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Supply
- Voltage - Supply, Analog:
- 2.35V ~ 3.6V
- Voltage - Supply, Digital:
- 2.35V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- TSOT-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7278AUJZ-RL7 FAQ
1.How can I place an order for AD7278AUJZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7278AUJZ-RL7 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 AD7278AUJZ-RL7 reliable?
The price and inventory of AD7278AUJZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7278AUJZ-RL7 is usually 5 days.
3.What payment methods are accepted for AD7278AUJZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7278AUJZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7278AUJZ-RL7?
AD7278AUJZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7278AUJZ-RL7 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 AD7278AUJZ-RL7?
For technical support, including AD7278AUJZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7278AUJZ-RL7 requirements.
6.How does Aetrix verify that AD7278AUJZ-RL7 is sourced from the original manufacturer or authorized distributors?
All AD7278AUJZ-RL7 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 AD7278AUJZ-RL7 meets industry standards.
7.What is the process for return or replacement of AD7278AUJZ-RL7?
All AD7278AUJZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7278AUJZ-RL7, 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 AD7278AUJZ-RL7 part is unused and in its original packaging.
Return procedure for AD7278AUJZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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