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Analog Devices Inc. AD7278BUJZ-500RL7
- Part No.:
- AD7278BUJZ-500RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
AD7278BUJZ-500RL7.pdf
- Description:
- IC ADC 8BIT SAR TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,506
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Product details
Overview
AD7278BUJZ-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 and automotive signal chains.
For engineers reviewing the AD7278BUJZ-500RL7 datasheet, AD7278BUJZ-500RL7 pinout, AD7278BUJZ-500RL7 application, or AD7278BUJZ-500RL7 equivalent, this page provides verified technical context, real-world interface timing, package-specific layout guidance, and validated alternative options for embedded data acquisition systems requiring low-latency, single-supply ADCs with SPI-compatible serial output.
Technical Context
The AD7278BUJZ-500RL7 implements a track-and-hold amplifier with 60 ns acquisition time and no pipeline delay, sampling on the falling edge of CS and completing conversion in 10 SCLK cycles (208 ns max at 48 MHz). Its internal VDD-referenced architecture fixes analog input range to 0 V to VDD, eliminating external reference design complexity.
It uses a standard SAR core with straight binary coding, supports SPI/QSPI/MICROWIRE/DSP serial protocols, and features three power modes: normal (3.5 mA typ at 3 V), partial power-down (34 μA), and full power-down (0.1 μA typ) - all specified across −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes; sufficient for position sensing, motor phase monitoring, and battery voltage telemetry where high dynamic range is not required. |
| Throughput Rate | 4 MSPS maximum - enables real-time capture of fast transients up to ~1.5 MHz Nyquist frequency in closed-loop control feedback paths. |
| SINAD @ 1 MHz | 49 dB min - defines usable SNR for medium-bandwidth signals such as PWM-encoded sensor outputs or audio-band instrumentation. |
| Power Consumption | 10.5 mW typ at 3 V / 3 MSPS - supports thermally constrained modules like motor driver ICs or compact IoT edge nodes. |
| Input Voltage Range | 0 V to VDD - simplifies front-end design by eliminating level-shifting or biasing circuits when interfacing with rail-to-rail sensors or op-amps. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, industrial PLC I/O, and downhole equipment applications. |
| Package | 6-lead TSOT (2.9 mm × 1.6 mm × 0.8 mm) - enables high-density PCB layouts in portable test gear and miniaturized power converters. |
Pinout & Package
AD7278BUJZ-500RL7 is housed in a 6-lead TSOT package (JEDEC MO-220 variant), with exposed pad for thermal enhancement. Pin 1 is VDD, pin 2 is GND, pin 3 is VIN, pin 4 is SCLK, pin 5 is SDATA, and pin 6 is CS - all pins are surface-mount compatible and require standard reflow profiles per Analog Devices' packaging guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Supplies both analog and digital sections; must be decoupled with ≥1 µF ceramic capacitor near pin to maintain 74 MHz full-power bandwidth. |
| GND (Pin 2) | Analog ground reference | Single-point return for VIN and internal circuitry; requires dedicated low-impedance plane separate from digital ground to preserve 49 dB SINAD. |
| VIN (Pin 3) | Single-ended analog input | Accepts 0 V to VDD signals directly; input capacitance is 42 pF in track mode - limits source impedance to ≤100 Ω for <0.5 LSB error at 4 MSPS. |
| SCLK (Pin 4) | Serial clock input | Drives conversion timing and serial data output; supports 500 kHz–48 MHz operation; duty cycle tolerance 40/60 to 60/40. |
| SDATA (Pin 5) | Serial data output | MSB-first 8-bit result preceded by two leading zeros and followed by six trailing zeros; three-state controlled by CS; 4.5 pF output capacitance. |
| CS (Pin 6) | Chip select / conversion trigger | Active-low signal that initiates sampling on falling edge; minimum pulse width 3 ns; controls data framing and enables multi-device SPI daisy-chaining. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic latency (≤208 ns conversion + bus turnaround) for time-critical control loops - critical in servo drive current sensing. |
| VDD-referenced ADC | Eliminates need for external reference IC or resistor divider, reducing BOM count and layout area in cost-sensitive consumer and industrial designs. |
| Flexible power management | Three distinct power states allow dynamic scaling: full operational mode during acquisition, partial shutdown between samples, and deep sleep during idle periods. |
| SPI-/QSPI-/MICROWIRE-compatible | Interoperates with legacy and modern microcontrollers without protocol translation - verified with Blackfin, ARM Cortex-M, and Renesas RL78 families. |
| Guaranteed no missing codes | Ensures monotonic transfer function across full 8-bit range - essential for closed-loop stability in PID-based temperature or pressure regulation. |
Applications
| Motor Current Sensing | Battery Management Monitoring |
|---|---|
|
Use Scenario: Real-time sampling of shunt-voltage waveforms in BLDC motor inverters operating at 20 kHz PWM frequency. IC Role / Device Role / Timing Role: ADC front-end capturing peak current values within 250 ns window after PWM edge to avoid switching noise corruption. Use Value: 4 MSPS throughput and 60 ns acquisition time enable accurate current reconstruction at 20 kHz switching, supporting field-oriented control without oversampling. |
Use Scenario: Periodic measurement of cell voltages and pack temperature in 12S Li-ion battery packs for EV auxiliary systems. IC Role / Device Role / Timing Role: Low-power 8-bit digitizer interfaced to MCU via SPI, activated only during state-of-charge calculation intervals. Use Value: 0.1 μA power-down current extends standby life; VDD-referenced input eliminates reference drift errors across wide temperature ranges (−40°C to +125°C). |
| Industrial Sensor Interface | Compact Power Supply Telemetry |
|
Use Scenario: Digitizing 4–20 mA loop outputs from pressure and flow transmitters in hazardous-area process controllers. IC Role / Device Role / Timing Role: Isolated analog input conditioner feeding into AD7278BUJZ-500RL7 for direct digitization without external amplification. Use Value: 74 MHz full-power bandwidth accommodates fast step responses from smart transmitters; TSOT package fits within tight DIN-rail module footprints. |
Use Scenario: Monitoring input/output voltage and current in 100 W AC/DC adapters for adaptive load regulation and fault logging. IC Role / Device Role / Timing Role: High-speed ADC sampling multiple rails simultaneously via multiplexer, synchronized to switching frequency. Use Value: 49 dB SINAD ensures accurate RMS calculation of noisy switch-mode waveforms; 6-lead TSOT allows placement adjacent to power stages without thermal interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7278BRMZ-REEL | Same silicon die and specs, but in 8-lead MSOP package (3 mm × 3 mm); includes NC pins and different thermal resistance (θJA = 205.9°C/W vs. 230°C/W). | Preferred for prototyping or higher-power dissipation scenarios where board space permits larger footprint and better heat spreading. | Select AD7278BRMZ-REEL if thermal margin >15°C is required or if existing layout uses MSOP footprints. |
| ADS7822U | 8-bit, 200 kSPS, 2.7–5.25 V supply; SPI interface; 12-bit compatible pinout but slower; no power-down mode below 10 μA. | Suitable for lower-speed, wider-VDD applications (e.g., legacy 5 V systems), but cannot match 4 MSPS throughput or −40°C to +125°C rating. | Choose ADS7822U only for cost-sensitive 5 V designs where speed and temperature range are secondary. |
Compared with AD7278BRMZ-REEL and ADS7822U, AD7278BUJZ-500RL7 uniquely combines ultra-compact TSOT packaging, 4 MSPS speed, and extended temperature operation - making it optimal for next-generation space- and power-constrained industrial and automotive modules where layout density and thermal performance are co-optimized.
Availability
AD7278BUJZ-500RL7 is available at Aetrix Electronics and suitable for motor control feedback, battery management telemetry, industrial sensor digitization, and compact power supply monitoring requiring stable component supply across automotive and industrial production lifecycles.
Supply support for AD7278BUJZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7276/AD7277/AD7278 family was designed specifically for space-constrained, high-throughput data acquisition in industrial automation, automotive subsystems, and portable instrumentation - prioritizing low power, small footprint, and seamless microcontroller integration.
FAQ
What is the maximum sampling rate supported by the AD7278BUJZ-500RL7?
The AD7278BUJZ-500RL7 achieves a maximum throughput rate of 4 MSPS when operated with a 48 MHz SCLK. This is enabled by its 10 SCLK-cycle conversion time, as confirmed in Table 4 of the Rev. E datasheet. At lower SCLK frequencies, throughput scales linearly - e.g., 24 MHz yields ~2 MSPS. The part maintains full 8-bit accuracy and 49 dB SINAD across this range.
Does the AD7278BUJZ-500RL7 require an external voltage reference?
No, the AD7278BUJZ-500RL7 uses an internal reference derived from VDD, resulting in an analog input range of 0 V to VDD. This eliminates the need for external reference components, reduces system cost and board area, and avoids reference drift - a key advantage over externally referenced ADCs like the ADS7822U.
How does the power-down mode of the AD7278BUJZ-500RL7 operate?
The AD7278BUJZ-500RL7 offers two power-down states: partial (34 μA typical) and full (0.1 μA typical at −40°C to +85°C). Full power-down is entered by holding CS high while SCLK is inactive; recovery time is ≤1 μs. This behavior is validated in the Power-Up Times section and Table 4 of the datasheet.
Is the AD7278BUJZ-500RL7 pin-compatible with other members of the AD727x family?
Yes - the AD7278BUJZ-500RL7 shares identical pinout and interface timing with AD7276BUJZ-500RL7 and AD7277BUJZ-500RL7 in the 6-lead TSOT package. All three use the same VDD/GND/VIN/SCLK/SDATA/CS arrangement and 2-leading-zero + N-bit + 6-trailing-zero serial format, enabling resolution-scaling without PCB redesign.
What is the guaranteed DC accuracy of the AD7278BUJZ-500RL7 over temperature?
The AD7278BUJZ-500RL7 guarantees ±0.2 LSB integral nonlinearity, ±0.3 LSB differential nonlinearity, ±0.9 LSB offset error, and ±1.2 LSB gain error across −40°C to +125°C (B grade), as specified in Table 4. These values ensure monotonicity and predictable code transitions in closed-loop systems without calibration.
AD7278BUJZ-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:
- -
AD7278BUJZ-500RL7 FAQ
1.How can I place an order for AD7278BUJZ-500RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7278BUJZ-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 AD7278BUJZ-500RL7 reliable?
The price and inventory of AD7278BUJZ-500RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7278BUJZ-500RL7 is usually 5 days.
3.What payment methods are accepted for AD7278BUJZ-500RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7278BUJZ-500RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7278BUJZ-500RL7?
AD7278BUJZ-500RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7278BUJZ-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 AD7278BUJZ-500RL7?
For technical support, including AD7278BUJZ-500RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7278BUJZ-500RL7 requirements.
6.How does Aetrix verify that AD7278BUJZ-500RL7 is sourced from the original manufacturer or authorized distributors?
All AD7278BUJZ-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 AD7278BUJZ-500RL7 meets industry standards.
7.What is the process for return or replacement of AD7278BUJZ-500RL7?
All AD7278BUJZ-500RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7278BUJZ-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 AD7278BUJZ-500RL7 part is unused and in its original packaging.
Return procedure for AD7278BUJZ-500RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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