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Analog Devices Inc. AD7478AAKSZ-500RL7
- Part No.:
- AD7478AAKSZ-500RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
AD7478AAKSZ-500RL7.pdf
- Description:
- IC ADC 8BIT SAR SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,055
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Product details
Overview
AD7478AAKSZ-500RL7 from Analog Devices is an 8-bit, 1.2 MSPS successive-approximation analog-to-digital converter (ADC) operating from a single 2.35 V to 5.25 V supply. It features 6-lead SC70 packaging, 12 SCLK-cycle serial interface, and delivers 49 dB SINAD at 100 kHz input frequency. It serves as a high-speed, low-power digitizer in portable medical sensors and battery-powered optical monitoring systems.
For engineers reviewing the AD7478AAKSZ-500RL7 datasheet, AD7478AAKSZ-500RL7 pinout, AD7478AAKSZ-500RL7 application, or AD7478AAKSZ-500RL7 equivalent, key selection criteria include its 8-bit resolution with guaranteed no missing codes, 1.2 MSPS throughput at 20 MHz SCLK, SC70 thermal impedance of 340.2°C/W, and SPI/QSPI/MICROWIRE-compatible serial interface timing.
Technical Context
The AD7478AAKSZ-500RL7 implements a standard successive-approximation register (SAR) architecture with no pipeline delay, where conversion is initiated on the falling edge of CS and completed in exactly 12 SCLK cycles. Its track-and-hold amplifier supports full-power bandwidth up to 13.5 MHz and acquisition time of 225 ns max.
It uses an internal VDD-referenced ADC core, enabling a 0 V to VDD analog input range without external reference components. Digital interface compliance includes SPI, QSPI, MICROWIRE, and DSP protocols, with output coding in straight binary format and data valid on the falling edge of SCLK.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit with guaranteed no missing codes - ensures monotonicity and simplifies firmware validation in closed-loop control. |
| Throughput Rate | 1.2 MSPS maximum - enables real-time sampling of signals up to ~600 kHz Nyquist-limited bandwidth. |
| SINAD @ 100 kHz | 49 dB minimum - defines usable dynamic range for medium-fidelity sensor digitization (e.g., pulse oximetry). |
| Supply Range | 2.35 V to 5.25 V - supports direct interfacing with Li-ion, 3.3 V, and 5 V system rails without LDO overhead. |
| Power Dissipation @ 1 MSPS | 5.1 mW max at 5 V, 3 mW max at 3 V - enables sub-10 mW signal chain operation in always-on wearable nodes. |
| Serial Interface Cycles | 12 SCLK per conversion - fixes deterministic latency and simplifies timing budgeting in microcontroller-driven acquisition. |
| Standby Current | 1 µA maximum - allows rapid wake-from-sleep ADC activation with <1 µs power-up time. |
Pinout & Package
AD7478AAKSZ-500RL7 is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm × 0.9 mm), optimized for space-constrained portable designs. Thermal resistance θJA = 340.2°C/W reflects its compact footprint and surface-mount thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VDD | Power supply input | Single 2.35–5.25 V rail powers analog core, digital logic, and internal reference - eliminates need for external voltage reference. |
| 2: GND | Analog ground reference | Dedicated AGND pin requires star grounding to minimize noise coupling into sensitive SAR conversion node. |
| 3: VIN | Analog input channel | Single-ended input with 0 V to VDD range and 20 pF input capacitance - mandates low-impedance source or external buffer for >10 kΩ sources. |
| 4: CS | Chip select / conversion trigger | Active-low signal initiates sampling on falling edge and frames serial data - enables precise synchronization with external event triggers. |
| 5: SDATA | Serial data output | Three-state output delivers 4 leading zeros + 8-bit result + 4 trailing zeros MSB-first - compatible with standard SPI shift registers without bit-shifting logic. |
| 6: SCLK | Serial clock input | Drives both data transfer and internal conversion timing - supports variable throughput via clock rate scaling (10 kHz–20 MHz). |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR architecture provides deterministic 12-SCLK conversion latency - critical for time-critical feedback loops in motor control or power regulation. |
| VDD-referenced ADC | Eliminates external reference IC and associated layout complexity while maintaining 0 V to VDD input range - reduces BOM count and PCB area. |
| SC70 package | Smallest available footprint among 8-bit 1+ MSPS ADCs - enables integration into ultra-thin wearables and miniature IoT sensor nodes. |
| Flexible power management | 1 µA standby current and <1 µs wake-up allow duty-cycled operation - extends battery life in intermittent-sampling applications like environmental logging. |
| SPI/QSPI/MICROWIRE compatibility | Direct connection to common microcontrollers (e.g., STM32, MSP430, nRF52) without level-shifting or protocol translation - accelerates firmware development. |
Applications
| Portable Medical Sensors | Battery-Powered Optical Monitoring |
|---|---|
|
Use Scenario: Pulse oximeter front-end digitizing photodiode current from red/IR LEDs. IC Role / Device Role / Timing Role: Single-ended 8-bit ADC capturing synchronized LED current samples at ≥1 kHz update rate with minimal latency. Use Value: 1.2 MSPS throughput and 225 ns acquisition time support high-fidelity waveform capture; SC70 size fits within tight optical module envelope. |
Use Scenario: Ambient light sensor in smartwatch display brightness control loop. IC Role / Device Role / Timing Role: Low-power ADC sampling phototransistor output during periodic wake cycles. Use Value: 1 µA standby current and <1 µs wake-up enable microamp-level average power consumption over long idle periods. |
| Industrial Data Acquisition Nodes | Mobile Communication Baseband Monitoring |
|
Use Scenario: Remote vibration sensor node measuring accelerometer output in predictive maintenance equipment. IC Role / Device Role / Timing Role: Digitizer interfacing with MEMS accelerometer's analog output under microcontroller control. Use Value: 2.35–5.25 V supply range accommodates wide-input DC-DC outputs; SPI compatibility simplifies integration with ARM Cortex-M host. |
Use Scenario: RF power amplifier bias current monitoring in LTE/5G small-cell transceivers. IC Role / Device Role / Timing Role: Fast-response ADC capturing PA current for closed-loop thermal derating. Use Value: 13.5 MHz full-power bandwidth supports accurate digitization of fast transient currents; 49 dB SINAD meets baseband SNR requirements. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit, 200 kSPS, 8-lead SOIC, external reference required | Lower speed, larger package, higher power (1.2 mW @ 200 kSPS) | Select when cost sensitivity outweighs speed and size constraints; not suitable for >1 MSPS or SC70-layout designs. |
| MAX11100ETT+ | 8-bit, 3 MSPS, 6-lead TDFN, internal reference, SPI-only interface | Higher throughput but lacks QSPI/MICROWIRE compatibility; 0.9 V to 3.6 V supply only | Prefer for 3.3 V-only systems needing >1.2 MSPS; avoid if 5 V operation or multi-protocol MCU interface is required. |
Compared with ADS7822U and MAX11100ETT+, the AD7478AAKSZ-500RL7 uniquely balances 1.2 MSPS speed, SC70 size, 2.35–5.25 V operation, and multi-protocol serial compatibility - making it optimal for space- and supply-flexible portable instrumentation.
Availability
AD7478AAKSZ-500RL7 is available at Aetrix Electronics and suitable for battery-powered medical devices, portable optical sensors, and industrial wireless data loggers requiring stable component supply across extended production lifecycles.
Supply support for AD7478AAKSZ-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 technologies, serving precision instrumentation, industrial automation, and communications markets since 1965.
The AD7476A/AD7477A/AD7478A family was designed for ultra-compact, low-power, high-speed data acquisition in portable and energy-sensitive systems - delivering scalable resolution (8/10/12-bit) in identical SC70 footprints.
FAQ
What is the maximum sample rate supported by the AD7478AAKSZ-500RL7?
The AD7478AAKSZ-500RL7 supports a maximum throughput rate of 1.2 MSPS, achieved when using a 20 MHz serial clock (SCLK) and operating in normal mode. This corresponds to a minimum conversion time of 600 ns, fixed at 12 SCLK cycles per sample. Performance remains specified across the full 2.35 V to 5.25 V supply range and −40°C to +85°C temperature range.
Does the AD7478AAKSZ-500RL7 require an external voltage reference?
No, the AD7478AAKSZ-500RL7 uses an internal reference derived from the VDD supply, enabling a full-scale analog input range of 0 V to VDD. This eliminates the need for external reference components, reducing system cost and board area. The device maintains 8-bit accuracy and guaranteed no missing codes without external reference calibration.
Which serial interface protocols is the AD7478AAKSZ-500RL7 compatible with?
The AD7478AAKSZ-500RL7 is compatible with SPI, QSPI, MICROWIRE, and generic DSP serial interfaces. Its SDATA output is three-state and synchronized to the falling edge of SCLK, delivering 4 leading zeros + 8-bit result + 4 trailing zeros in straight binary format - ensuring plug-and-play integration with common microcontrollers including STM32, PIC, and TI C2000 series.
What is the power consumption of the AD7478AAKSZ-500RL7 at 3 V and 1 MSPS?
At 3 V supply and 1 MSPS throughput, the AD7478AAKSZ-500RL7 consumes a maximum of 5.1 mW in normal operational mode. In full power-down mode, it draws ≤1 µA (typically 50 nA), enabling ultra-low average power in duty-cycled applications. Power scales linearly with SCLK frequency, allowing further reduction during idle periods.
Is the AD7478AAKSZ-500RL7 pin-compatible with other members of the AD7476A/AD7477A/AD7478A family?
Yes, the AD7478AAKSZ-500RL7 shares identical 6-lead SC70 pinout and pin functions with AD7476AAKSZ-500RL7 and AD7477AAKSZ-500RL7. All three variants use VDD, GND, VIN, CS, SDATA, and SCLK in the same physical locations and electrical roles - enabling hardware reuse across 8-bit, 10-bit, and 12-bit resolution requirements in the same PCB design.
AD7478AAKSZ-500RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 1.2M
- 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:
- SC-70-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7478AAKSZ-500RL7 FAQ
1.How can I place an order for AD7478AAKSZ-500RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7478AAKSZ-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 AD7478AAKSZ-500RL7 reliable?
The price and inventory of AD7478AAKSZ-500RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7478AAKSZ-500RL7 is usually 5 days.
3.What payment methods are accepted for AD7478AAKSZ-500RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7478AAKSZ-500RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7478AAKSZ-500RL7?
AD7478AAKSZ-500RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7478AAKSZ-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 AD7478AAKSZ-500RL7?
For technical support, including AD7478AAKSZ-500RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7478AAKSZ-500RL7 requirements.
6.How does Aetrix verify that AD7478AAKSZ-500RL7 is sourced from the original manufacturer or authorized distributors?
All AD7478AAKSZ-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 AD7478AAKSZ-500RL7 meets industry standards.
7.What is the process for return or replacement of AD7478AAKSZ-500RL7?
All AD7478AAKSZ-500RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7478AAKSZ-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 AD7478AAKSZ-500RL7 part is unused and in its original packaging.
Return procedure for AD7478AAKSZ-500RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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