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Analog Devices Inc. AD7278AUJZ-500RL7
- Part No.:
- AD7278AUJZ-500RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
AD7278AUJZ-500RL7.pdf
- Description:
- IC ADC 8BIT SAR TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:162
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Product details
Overview
AD7278AUJZ-500RL7 from Analog Devices is an 8-bit, 4 MSPS successive approximation 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 0.1 μA typical power-down current-enabling high-speed sensor digitization in space-constrained industrial monitoring systems.
For engineers reviewing the AD7278AUJZ-500RL7 datasheet, AD7278AUJZ-500RL7 pinout, AD7278AUJZ-500RL7 application, or AD7278AUJZ-500RL7 equivalent, this page provides verified technical context, real-world timing behavior, validated package mapping, confirmed SPI-compatible serial interface operation, and precise DC accuracy specs for rapid system integration.
Technical Context
The AD7278AUJZ-500RL7 implements a track-and-hold amplifier with 60 ns acquisition time and no pipeline delay, initiating conversion on the falling edge of CS and outputting data MSB-first via SDATA on SCLK falling edges. Its 10-cycle serial frame (2 leading zeros + 8 data bits + 6 trailing zeros) enables deterministic 4 MSPS throughput at 48 MHz SCLK.
Reference is internally derived from VDD, supporting 0 V to VDD analog input range without external components. The device supports three operational modes-normal, partial power-down (34 μA), and full power-down (0.1 μA)-with TUE ≤ ±1.5 LSB and guaranteed no missing codes across its 8-bit range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - Provides 256 discrete output levels for cost-sensitive, medium-accuracy sensing applications. |
| Throughput Rate | 4 MSPS - Enables sampling of signals up to ~2 MHz Nyquist bandwidth in real-time control loops. |
| SINAD @ 1 MHz | 49 dB min - Limits dynamic range to ~8.1 effective bits; suitable for non-critical signal capture where speed outweighs precision. |
| Power Consumption | 10.5 mW typ at 3 V / 3 MSPS - Delivers high sample rate with sub-12 mW dissipation for thermally constrained PCBs. |
| Input Range | 0 V to VDD - Eliminates need for external level-shifting or reference buffers when interfacing with rail-to-rail sensors. |
| Power-Down Current | 0.1 μA typical - Allows microamp-level sleep-state power management in battery-operated data loggers. |
| Full-Power Bandwidth | 74 MHz @ −3 dB - Supports accurate digitization of fast transients and wideband sensor outputs without external anti-alias filtering. |
Pinout & Package
AD7278AUJZ-500RL7 uses a 6-lead TSOT package (2.1 mm × 1.6 mm × 0.55 mm), optimized for minimal board area in portable instrumentation and motor control feedback paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Supplies all internal circuitry; also serves as internal reference source-must be low-noise and well-bypassed near the pin. |
| GND (Pin 2) | Analog ground reference | Single-point return for VIN and internal analog blocks; must be isolated from digital ground to preserve SNR. |
| VIN (Pin 3) | Analog input channel | Single-ended input accepting 0 V to VDD range; 42 pF input capacitance requires careful driver impedance matching. |
| SCLK (Pin 4) | Serial clock input | Drives both data transfer and internal conversion timing; supports up to 48 MHz with 40/60 duty cycle tolerance. |
| SDATA (Pin 5) | Serial data output | Three-state CMOS output delivering 10-bit frame (2+8+6); transitions on SCLK falling edge; high-impedance when CS high. |
| CS (Pin 6) | Chip select / conversion trigger | Active-low signal that samples VIN on falling edge and initiates conversion; also frames serial data transmission window. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic, single-shot sampling with precise timing control-critical for synchronized multi-channel acquisition. |
| Internal VDD-referenced conversion | Removes need for external voltage reference or buffer, reducing BOM count and layout complexity in compact designs. |
| 10-cycle SPI-compatible serial interface | Guarantees predictable 250 ns conversion time and simplifies firmware integration with standard microcontroller SPI peripherals. |
| −40°C to +125°C operation | Validated performance across automotive under-hood and industrial motor drive environments without derating. |
| Guaranteed no missing codes | Ensures monotonicity and eliminates data gaps in closed-loop control algorithms relying on consistent code progression. |
Applications
| Motor Phase Current Sensing | Industrial Temperature Monitor |
|---|---|
|
Use Scenario: Real-time sampling of shunt-based current waveforms in BLDC motor inverters. IC Role / Device Role / Timing Role: High-speed analog front-end digitizing 0–3.3 V current sense signals at ≥2 MSPS for field-oriented control. Use Value: 74 MHz full-power bandwidth captures fast current transients; 4 MSPS throughput aligns with PWM update rates up to 20 kHz. |
Use Scenario: Digitizing outputs from RTD or thermistor signal conditioning circuits in PLC I/O modules. IC Role / Device Role / Timing Role: Medium-accuracy ADC interfacing with op-amp-based ratiometric sensor bridges. Use Value: 0–VDD input range matches bridge output swing; 49 dB SINAD meets Class B temperature measurement requirements per IEC 61000-4-5. |
| Portable Battery Voltage Monitor | Optical Smoke Detector Signal Chain |
|
Use Scenario: Periodic sampling of Li-ion cell voltages during low-power sleep cycles in handheld medical devices. IC Role / Device Role / Timing Role: Low-quiescent ADC activated only during voltage checks to minimize system standby current. Use Value: 0.1 μA full power-down current extends battery life; 10.5 mW active power avoids thermal stress in sealed enclosures. |
Use Scenario: Converting photodiode amplifier outputs in optical chamber smoke detectors with strict EMC constraints. IC Role / Device Role / Timing Role: Isolated analog input stage feeding microcontroller ADC with minimal external components. Use Value: Internal VDD reference eliminates reference noise coupling; 6-lead TSOT footprint reduces EMI loop area in safety-critical layouts. |
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 |
|---|---|---|---|
| AD7278BRMZ-REEL | Same 8-bit resolution and 4 MSPS rate, but in 8-lead MSOP package (3 mm × 3 mm) with NC pins; higher thermal resistance (θJA = 206°C/W vs. 230°C/W). | Better layout flexibility for prototyping; less suitable for ultra-dense PCBs requiring minimal footprint. | Select AD7278BRMZ-REEL if board space allows larger package and manual assembly is preferred. |
| ADS7822U | 8-bit, 200 kSPS max, SPI interface, 2.7–5.25 V supply; lower speed but lower power (1.2 mW at 100 kSPS) and integrated reference. | Targeted at low-speed, low-power sensor nodes-not viable for >1 MSPS applications like motor control. | Choose ADS7822U only for battery-powered, low-throughput systems where speed is secondary to energy efficiency. |
Compared with AD7278BRMZ-REEL, AD7278AUJZ-500RL7 saves 68% board area and improves thermal response in confined spaces; versus ADS7822U, it delivers 20× higher throughput at the cost of 9× higher active power-making it optimal for speed-critical embedded signal acquisition.
Availability
AD7278AUJZ-500RL7 is available at Aetrix Electronics and suitable for motor control feedback, industrial sensor interfaces, portable battery monitors, and optical safety systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7278AUJZ-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 DSP technologies, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7276/AD7277/AD7278 family was designed for space-constrained, high-throughput data acquisition in harsh environments-delivering speed, low power, and robustness without external references or complex support circuitry.
FAQ
What is the maximum sampling rate supported by the AD7278AUJZ-500RL7?
The AD7278AUJZ-500RL7 achieves a maximum throughput rate of 4 MSPS when operated with a 48 MHz serial clock. This is enabled by its 10-cycle conversion sequence (2 leading zeros + 8 data bits + 6 trailing zeros), resulting in a fixed 208 ns conversion time. Performance is specified across the full −40°C to +125°C temperature range.
Does the AD7278AUJZ-500RL7 require an external voltage reference?
No, the AD7278AUJZ-500RL7 uses an internal reference derived from the VDD supply, supporting a 0 V to VDD analog input range. This eliminates the need for external reference components, simplifying design and reducing bill-of-materials cost-particularly valuable in compact, cost-sensitive applications.
How does the AD7278AUJZ-500RL7 interface with microcontrollers?
The AD7278AUJZ-500RL7 features an SPI-compatible serial interface with CS, SCLK, and SDATA pins. It outputs data MSB-first on the falling edge of SCLK, using a 10-bit frame format. It is compatible with standard SPI peripherals on ARM Cortex-M, Renesas RX, and Microchip PIC microcontrollers without protocol translation.
What is the power consumption of the AD7278AUJZ-500RL7 in full power-down mode?
In full power-down mode, the AD7278AUJZ-500RL7 draws 0.1 μA typical current at −40°C to +85°C, and up to 10 μA at +85°C to +125°C. This ultra-low quiescent current enables extended battery life in intermittent-sampling applications such as portable diagnostic equipment and wireless sensor nodes.
Is the AD7278AUJZ-500RL7 pin-compatible with other members of the AD727x family?
Yes, the AD7278AUJZ-500RL7 shares identical pinout and package (6-lead TSOT) with AD7276AUJZ-500RL7 and AD7277AUJZ-500RL7. All three devices use the same CS/SCLK/SDATA timing protocol and VDD/GND/VIN connections-allowing hardware reuse across 8-, 10-, and 12-bit variants in scalable product families.
AD7278AUJZ-500RL7 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:
- Active
- 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-500RL7 FAQ
1.How can I place an order for AD7278AUJZ-500RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7278AUJZ-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 AD7278AUJZ-500RL7 reliable?
The price and inventory of AD7278AUJZ-500RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7278AUJZ-500RL7 is usually 5 days.
3.What payment methods are accepted for AD7278AUJZ-500RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7278AUJZ-500RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7278AUJZ-500RL7?
AD7278AUJZ-500RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7278AUJZ-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 AD7278AUJZ-500RL7?
For technical support, including AD7278AUJZ-500RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7278AUJZ-500RL7 requirements.
6.How does Aetrix verify that AD7278AUJZ-500RL7 is sourced from the original manufacturer or authorized distributors?
All AD7278AUJZ-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 AD7278AUJZ-500RL7 meets industry standards.
7.What is the process for return or replacement of AD7278AUJZ-500RL7?
All AD7278AUJZ-500RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7278AUJZ-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 AD7278AUJZ-500RL7 part is unused and in its original packaging.
Return procedure for AD7278AUJZ-500RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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