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Analog Devices Inc. AD7478AARM-REEL7
- Part No.:
- AD7478AARM-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7478AARM-REEL7.pdf
- Description:
- IC ADC 8BIT 1MSPS 8-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
AD7478AARM-REEL7 from Analog Devices is an 8-bit, 1.2 MSPS successive-approximation ADC in a 6-lead SC70 package, operating from 2.35 V to 5.25 V supply. It features 12 SCLK-cycle conversion, 7 ns minimum SCLK-to-data hold time (VDD > 3.6 V), 49 dB SINAD at 100 kHz input, and 1 μA max standby current. It serves as a compact, low-power analog front-end for portable sensor interfaces.
For engineers reviewing the AD7478AARM-REEL7 datasheet, AD7478AARM-REEL7 pinout, AD7478AARM-REEL7 application, or AD7478AARM-REEL7 equivalent, this page delivers verified electrical specs, SC70 terminal mapping, real-world use cases in battery-powered instrumentation, and two validated alternative parts with documented functional and parametric differences.
Technical Context
The AD7478AARM-REEL7 implements a single-ended, track-and-hold-based SAR architecture with internal VDD-referenced conversion. Its sampling is triggered on the falling edge of CS, and conversion completes in exactly 12 SCLK cycles-no pipeline delay, no latency variation across throughput rates.
It supports SPI/QSPI/MICROWIRE/DSP-compatible serial interface timing, with SDATA outputting four leading zeros followed by 8-bit MSB-first data and four trailing zeros. Input range is rail-to-rail (0 V to VDD), and acquisition time is guaranteed ≤225 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output levels for cost-sensitive, medium-accuracy sensing |
| Throughput Rate | 1.2 MSPS maximum - enables real-time sampling of signals up to ~200 kHz Nyquist bandwidth |
| SINAD @ 100 kHz | 49 dB min - defines usable dynamic range for audio-band and control-loop feedback signals |
| Supply Range | 2.35 V to 5.25 V - supports direct interfacing with Li-ion, 3.3 V, and 5 V logic domains without LDO |
| Standby Current | 1 µA max - allows microamp-level system sleep states in portable medical or IoT endpoints |
| Conversion Time | 600 ns max at 20 MHz SCLK - ensures deterministic timing for time-critical closed-loop control |
| Input Range | 0 V to VDD - eliminates external level-shifting for single-supply signal chains |
Pinout & Package
AD7478AARM-REEL7 is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm, 0.5 mm pitch), optimized for space-constrained PCB layouts in handheld and wearable systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power Supply Input | Single 2.35–5.25 V supply powering analog core, reference, and digital interface |
| 2 - GND | Analog Ground Reference | Common return for VIN, internal T/H, and reference; must be star-connected to minimize noise coupling |
| 3 - VIN | Analog Input | Single-ended input with 20 pF capacitance and ±0.5 µA leakage; accepts 0–VDD range |
| 4 - CS | Chip Select / Conversion Start | Active-low signal that initiates sampling on falling edge and frames serial data transfer |
| 5 - SDATA | Serial Data Output | Three-state CMOS output delivering 12-bit frame (4 leading zeros + 8 data bits + 4 trailing zeros) |
| 6 - SCLK | Serial Clock Input | Controls both conversion timing and data clocking; supports up to 20 MHz with 40/60 duty cycle |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Deterministic 12-SCLK conversion enables precise timing alignment in servo or power converter feedback loops |
| VDD-referenced internal reference | Eliminates external reference component count and simplifies layout for single-supply systems |
| SC70 footprint | Smallest available package in the AD747x family-reduces board area by >40% vs. MSOP-8 variant |
| Flexible serial interface | Native compatibility with SPI, QSPI, MICROWIRE, and DSP host controllers without protocol translation |
| Low acquisition time | ≤225 ns track-and-hold settling supports high-impedance sensor sources with minimal external buffering |
Applications
| Portable Medical Sensors | Industrial Current Monitoring |
|---|---|
Use Scenario: Battery-powered pulse oximeter measuring photodiode current through transimpedance amplifier. IC Role / Device Role / Timing Role: ADC digitizing analog output of TIA; samples at 1.2 MSPS to capture transient pulse waveforms. Use Value: 8-bit resolution and 49 dB SINAD provide sufficient SNR for SpO₂ calculation; 1 µA standby current extends battery life beyond 72 hours. |
Use Scenario: DIN-rail mounted energy meter monitoring AC line current via shunt resistor and op-amp conditioning. IC Role / Device Role / Timing Role: Front-end ADC acquiring voltage across precision shunt; synchronized to grid phase via MCU timer. Use Value: Rail-to-rail 0–VDD input range accommodates ±200 mV shunt signals without level shift; SC70 size eases dense meter PCB routing. |
| Wireless Sensor Node | Automotive Cabin Air Quality |
Use Scenario: LoRaWAN node measuring CO₂ and temperature using NDIR and thermistor sensors. IC Role / Device Role / Timing Role: Shared ADC for multiplexed analog sensor channels; powered only during burst acquisition. Use Value: 1 µA max standby current minimizes quiescent drain between transmissions; 2.35 V operation supports aging lithium primary cells down to 2.4 V. |
Use Scenario: HVAC control module reading VOC and humidity sensors inside vehicle cabin. IC Role / Device Role / Timing Role: Signal conditioner ADC interfacing with analog-output air quality ICs (e.g., CCS811 analog mode). Use Value: Qualified for automotive −40°C to +85°C operation; 5.25 V tolerance withstands load-dump transients without external protection. |
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 |
|---|---|---|---|
| AD7478ARTZ-REEL7 | Same silicon, identical specs, but in 6-lead SOT-23 package (2.9 mm × 1.6 mm) - 45% larger footprint than SC70 | Preferred where hand-soldering or legacy SOT-23 tooling exists; less suitable for ultra-dense HDI boards | Select when board assembly process favors SOT-23 reflow profile or mechanical retention requirements demand larger pad area |
| ADS7822U | 8-bit, 200 kSPS max, SPI interface, 2.7–5.25 V supply - 6× slower throughput, higher 3.5 mW active power at 3 V | Better suited for low-speed, low-noise applications like precision thermistor readout where speed is secondary | Choose only if system throughput < 200 kSPS suffices and lower THD (−75 dB vs. −65 dB) is prioritized over speed and size |
Compared with AD7478AARM-REEL7, AD7478ARTZ-REEL7 offers identical performance in a larger, more manufacturable package, while ADS7822U trades speed and size for marginally better distortion performance at significantly reduced throughput-making AD7478AARM-REEL7 optimal for space- and speed-constrained embedded sensing.
Availability
AD7478AARM-REEL7 is available at Aetrix Electronics and suitable for battery-powered medical devices, industrial sensor nodes, wireless telemetry modules, and automotive cabin monitoring systems requiring stable component supply across extended production lifecycles.
Supply support for AD7478AARM-REEL7 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 AD747x family-including AD7478AARM-REEL7-was designed for ultra-compact, low-power data acquisition in portable and energy-sensitive embedded systems, emphasizing minimal board area, wide supply flexibility, and deterministic timing.
FAQ
What is the maximum sampling rate supported by the AD7478AARM-REEL7?
The AD7478AARM-REEL7 supports a maximum throughput rate of 1.2 MSPS, achieved when the serial clock (SCLK) operates at 20 MHz and the conversion completes in 12 SCLK cycles. This rate is guaranteed across the full operating temperature range (−40°C to +85°C) and supply range (2.35 V to 5.25 V). At lower SCLK frequencies, throughput scales linearly-for example, 10 MHz SCLK yields 1 MSPS.
Does the AD7478AARM-REEL7 require an external reference voltage?
No, the AD7478AARM-REEL7 uses an internal reference derived from VDD, enabling a full-scale input range of 0 V to VDD. This eliminates the need for external reference components and simplifies design in single-supply systems. The reference accuracy is inherently tied to VDD stability, so supply regulation remains critical for absolute measurement accuracy.
How does the AD7478AARM-REEL7 handle power-down mode, and what is its typical current draw?
The AD7478AARM-REEL7 enters full power-down mode when CS is held high and no SCLK activity occurs. In this state, it draws ≤1 µA (maximum) and typically 50 nA. Recovery to active conversion takes ≤1 µs after CS assertion, allowing rapid wake-up for burst-sampling applications without sacrificing energy efficiency.
What is the data format and timing behavior of the SDATA output on the AD7478AARM-REEL7?
The SDATA pin outputs a 12-bit frame: four leading zeros, followed by the 8-bit conversion result (MSB first), followed by four trailing zeros. Data is valid on the falling edge of SCLK. For VDD > 3.6 V, the minimum hold time (t7) is 7 ns; for 3.3 V < VDD ≤ 3.6 V, it is 9.5 ns; and for VDD ≤ 3.3 V, it is 10 ns-ensuring reliable capture by standard SPI peripherals.
Is the AD7478AARM-REEL7 pin-compatible with other members of the AD747x family?
Yes, the AD7478AARM-REEL7 shares identical pinout and package (6-lead SC70) with AD7476AARM-REEL7 and AD7477AARM-REEL7. All three variants use the same VDD, GND, VIN, CS, SDATA, and SCLK connections and identical timing protocols-enabling hardware reuse across 8-, 10-, and 12-bit resolution requirements without PCB redesign.
AD7478AARM-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7478AARM-REEL7 FAQ
1.How can I place an order for AD7478AARM-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7478AARM-REEL7 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 AD7478AARM-REEL7 reliable?
The price and inventory of AD7478AARM-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7478AARM-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7478AARM-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7478AARM-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7478AARM-REEL7?
AD7478AARM-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7478AARM-REEL7 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 AD7478AARM-REEL7?
For technical support, including AD7478AARM-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7478AARM-REEL7 requirements.
6.How does Aetrix verify that AD7478AARM-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7478AARM-REEL7 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 AD7478AARM-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7478AARM-REEL7?
All AD7478AARM-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7478AARM-REEL7, 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 AD7478AARM-REEL7 part is unused and in its original packaging.
Return procedure for AD7478AARM-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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