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Analog Devices Inc. AD7478ARTZ-500RL7
- Part No.:
- AD7478ARTZ-500RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
AD7478ARTZ-500RL7.pdf
- Description:
- IC ADC 8BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,618
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Product details
Overview
AD7478ARTZ-500RL7 from Analog Devices is an 8-bit, 1 MSPS successive-approximation ADC in a 6-lead SOT-23 package, operating from 2.7 V to 5.25 V supply, delivering 49 dB SINAD at 100 kHz input, with 800 ns conversion time and 4.8 mW power dissipation at 3 V/1 MSPS - used in compact battery-powered data acquisition and optical sensor front-ends.
For engineers reviewing the AD7478ARTZ-500RL7 datasheet, AD7478ARTZ-500RL7 pinout, AD7478ARTZ-500RL7 application, or AD7478ARTZ-500RL7 equivalent, key selection criteria include its 8-bit resolution, single-supply operation, SPI-compatible serial interface, no pipeline delay, and guaranteed no missing codes - critical for deterministic timing in portable instrumentation and real-time signal monitoring.
Technical Context
The AD7478ARTZ-500RL7 implements a standard successive-approximation register (SAR) architecture with internal track-and-hold, sampling on the falling edge of CS and completing conversion in exactly 16 SCLK cycles. Its reference is derived directly from VDD, enabling a 0 V to VDD analog input range without external components.
It features a flexible serial interface compatible with SPI, QSPI, MICROWIRE, and DSP controllers, with output data formatted as four leading zeros followed by eight data bits and four trailing zeros (MSB first), and supports full power-down mode drawing ≤1 μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output levels for moderate-precision sensing applications. |
| Throughput Rate | 1 MSPS - enables real-time sampling of signals up to ~500 kHz Nyquist bandwidth. |
| SINAD @ 100 kHz | 49 dB min - defines usable dynamic range for audio-band and sensor signal digitization. |
| Conversion Time | 800 ns max - fixed latency per sample, enabling precise timing control in closed-loop systems. |
| Supply Voltage Range | 2.7 V to 5.25 V - supports direct interfacing with Li-ion, 3.3 V, and 5 V logic domains. |
| Power Dissipation @ 3 V | 4.8 mW max at 1 MSPS - enables >200 kSPS operation within 100 μW average power budgets. |
| Input Range | 0 V to VDD - eliminates need for level-shifting or external reference in single-supply designs. |
Pinout & Package
AD7478ARTZ-500RL7 is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178AA), with 0.95 mm pitch, 2.9 mm × 1.6 mm footprint, and thermal resistance θJA = 230°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Single 2.7–5.25 V rail powers analog core, reference, and digital interface; also serves as ADC reference source. |
| 2 - GND | Analog ground | Common return for analog input, internal circuitry, and reference; must be low-impedance and separated from digital ground. |
| 3 - VIN | Analog input | Single-ended input with 0 V to VDD range, 30 pF capacitance, ±1 μA leakage - requires external RC anti-aliasing if sampling >100 kHz. |
| 4 - SCLK | Serial clock input | Controls conversion timing and data clocking; accepts 10 kHz–20 MHz; determines throughput rate and average power consumption. |
| 5 - SDATA | Serial data output | Three-state CMOS output; delivers 12-bit frame (4-8-4 format) MSB-first on SCLK falling edge; high-impedance when CS inactive. |
| 6 - CS | Chip select / conversion trigger | Active-low signal initiating sampling on falling edge and framing 12-bit serial transfer; enables multi-device SPI bus sharing. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Deterministic 800 ns conversion latency enables precise synchronization in time-critical control loops. |
| Internal VDD-referenced ADC | Eliminates external reference IC and associated layout complexity while maintaining full-scale linearity across supply range. |
| Guaranteed no missing codes | Ensures monotonic response and predictable behavior in closed-loop feedback and threshold-detection applications. |
| 1 μA shutdown current | Reduces system standby power to near-zero - essential for battery life extension in intermittent-sampling instruments. |
| SPI/QSPI/MICROWIRE compatibility | Direct interoperability with common microcontrollers (e.g., STM32, MSP430, ADSP-BF5xx) without protocol translation logic. |
Applications
| Portable Medical Sensors | Optical Sensor Interfaces |
|---|---|
Use Scenario: Digitizing photodiode current outputs in handheld pulse oximeters and glucose meters with limited PCB area and strict battery life targets. IC Role / Device Role / Timing Role: Single-ended 8-bit SAR ADC acquiring analog sensor signals at 100–500 kSPS with deterministic latency and minimal external components. Use Value: Enables compact, low-power front-end design with no external reference or op-amp buffer required due to VDD-referenced input and 30 pF input capacitance. |
Use Scenario: Converting ambient light or IR proximity sensor outputs in smart wearables and IoT nodes where size and quiescent current are critical. IC Role / Device Role / Timing Role: Low-latency, low-power ADC sampling fast transient optical events (e.g., gesture detection) with precise timing control via CS-triggered acquisition. Use Value: 1 μA shutdown mode extends battery life between measurements; 800 ns conversion allows rapid wake-up and sampling without sacrificing responsiveness. |
| Industrial Data Loggers | Mobile Communication Front-Ends |
Use Scenario: Capturing temperature, pressure, or voltage telemetry in field-deployed environmental monitors powered by coin cells or energy harvesters. IC Role / Device Role / Timing Role: 8-bit precision ADC interfacing directly to resistive sensors or op-amp outputs, controlled by low-power MCU over SPI. Use Value: 2.7–5.25 V operation supports wide input voltage ranges; 4.8 mW at 1 MSPS enables burst-mode acquisition without thermal derating. |
Use Scenario: Sampling RF power detector outputs or baseband signal paths in 4G/LTE small-cell modules and portable test equipment. IC Role / Device Role / Timing Role: High-speed, low-jitter ADC capturing envelope or RSSI signals with 30 ps aperture jitter and 6.5 MHz full-power bandwidth. Use Value: 49 dB SINAD at 100 kHz ensures accurate amplitude measurement of modulated signals; SOT-23 footprint saves board space in dense RF layouts. |
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 |
|---|---|---|---|
| ADS7822IDR | 8-bit, 200 kSPS, 2.7–5.5 V, 3.3 mW @ 3 V - slower but lower noise (52 dB SINAD) and integrated reference buffer. | Better suited for DC-coupled, low-frequency sensor measurements requiring higher SNR than speed. | Select ADS7822IDR when absolute accuracy and low-frequency stability outweigh throughput needs. |
| MAX11100ETT+ | 8-bit, 1 MSPS, 2.7–3.6 V only, 2.5 mW @ 3 V - narrower supply range but lower power and smaller 6-bump WLP package. | Ideal for ultra-compact, single-3.3V systems where board area is more constrained than voltage flexibility. | Choose MAX11100ETT+ for space-constrained 3.3 V designs prioritizing minimal footprint and sub-3 mW operation. |
Compared with ADS7822IDR and MAX11100ETT+, AD7478ARTZ-500RL7 uniquely balances 1 MSPS speed, wide 2.7–5.25 V operation, and VDD-referenced simplicity - making it optimal for mixed-voltage portable systems needing deterministic latency and minimal BOM count.
Availability
AD7478ARTZ-500RL7 is available at Aetrix Electronics and suitable for battery-powered medical sensors, optical sensor interfaces, industrial data loggers, and mobile communication front-ends requiring stable component supply across extended production lifecycles.
Supply support for AD7478ARTZ-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, with deep expertise in precision data conversion and sensor signal chains.
The AD7476/AD7477/AD7478 family was designed specifically for space- and power-constrained applications requiring high-speed, low-power, single-supply ADCs in miniature packages - targeting portable instrumentation, sensor nodes, and embedded control systems.
FAQ
What is the maximum sampling frequency supported by the AD7478ARTZ-500RL7?
The AD7478ARTZ-500RL7 supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz serial clock (SCLK) and 16-cycle conversion sequence. This yields a fixed 800 ns conversion time, enabling precise timing control in real-time signal capture applications without pipeline delay.
Does the AD7478ARTZ-500RL7 require an external reference voltage?
No, the AD7478ARTZ-500RL7 uses an internal reference derived from the VDD supply, supporting an analog input range of 0 V to VDD. This eliminates the need for external reference ICs or decoupling networks, simplifying design and reducing bill-of-materials cost in single-supply systems.
What serial interface protocols is the AD7478ARTZ-500RL7 compatible with?
The AD7478ARTZ-500RL7 features an SPI-compatible serial interface that operates with standard SPI, QSPI, MICROWIRE, and DSP host controllers. It uses CS as frame sync, SCLK for timing, and SDATA for MSB-first 12-bit frames (4-8-4 format), ensuring broad microcontroller interoperability without protocol translation.
How does the AD7478ARTZ-500RL7 manage power in low-duty-cycle applications?
The AD7478ARTZ-500RL7 includes a full power-down mode drawing ≤1 μA when SCLK is inactive, allowing dramatic power reduction between conversions. Combined with programmable SCLK speed, this enables adaptive power scaling - e.g., 4.8 mW during active sampling at 1 MSPS, dropping to microwatt-level standby.
Is the AD7478ARTZ-500RL7 pin-compatible with other members of the AD7476/AD7477/AD7478 family?
Yes, all AD7476/AD7477/AD7478 variants share identical 6-lead SOT-23 pinout and functional pin definitions (VDD, GND, VIN, SCLK, SDATA, CS). This allows hardware reuse across 8-, 10-, and 12-bit versions - firmware and layout remain unchanged when upgrading resolution or adjusting performance trade-offs.
AD7478ARTZ-500RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 1M
- 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:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7478ARTZ-500RL7 FAQ
1.How can I place an order for AD7478ARTZ-500RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7478ARTZ-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 AD7478ARTZ-500RL7 reliable?
The price and inventory of AD7478ARTZ-500RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7478ARTZ-500RL7 is usually 5 days.
3.What payment methods are accepted for AD7478ARTZ-500RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7478ARTZ-500RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7478ARTZ-500RL7?
AD7478ARTZ-500RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7478ARTZ-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 AD7478ARTZ-500RL7?
For technical support, including AD7478ARTZ-500RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7478ARTZ-500RL7 requirements.
6.How does Aetrix verify that AD7478ARTZ-500RL7 is sourced from the original manufacturer or authorized distributors?
All AD7478ARTZ-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 AD7478ARTZ-500RL7 meets industry standards.
7.What is the process for return or replacement of AD7478ARTZ-500RL7?
All AD7478ARTZ-500RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7478ARTZ-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 AD7478ARTZ-500RL7 part is unused and in its original packaging.
Return procedure for AD7478ARTZ-500RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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