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Analog Devices Inc. AD7478AARM-REEL
- Part No.:
- AD7478AARM-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7478AARM-REEL.pdf
- Description:
- IC ADC 8BIT 1MSPS 8-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,596
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Product details
Overview
AD7478AARM-REEL 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, 7 ns minimum SCLK-to-data valid hold time at VDD > 3.6 V, ±0.3 LSB integral nonlinearity, and 49 dB SINAD at 100 kHz input - deployed in battery-powered instrumentation and optical sensor front-ends.
For engineers reviewing the AD7478AARM-REEL datasheet, AD7478AARM-REEL pinout, AD7478AARM-REEL application, or AD7478AARM-REEL equivalent, this page delivers verified specifications, SC70 terminal mapping, real-world use cases in portable medical devices and modem signal chains, and validated alternative parts with documented functional and resolution differences.
Technical Context
The AD7478AARM-REEL implements a standard SAR architecture with no pipeline delay, using CS falling edge to simultaneously sample VIN and initiate conversion. Its internal track-and-hold amplifier achieves 13.5 MHz full-power bandwidth and 225 ns acquisition time, enabling accurate digitization of fast transients in low-voltage systems.
Conversion timing is fully synchronous to SCLK: 12 clock cycles define the total conversion period, with data output MSB-first after four leading zeros. The reference is derived directly from VDD, fixing the analog input range to 0 V to VDD and eliminating external reference components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - supports compact firmware handling and reduced memory footprint in resource-constrained embedded systems |
| Throughput Rate | 1.2 MSPS maximum - enables real-time sampling of audio-band and control-loop signals without oversampling penalty |
| Supply Voltage Range | 2.35 V to 5.25 V - interoperable with Li-ion, 3.3 V, and 5 V logic domains without level-shifting |
| SINAD @ 100 kHz | 49 dB minimum - sufficient for basic waveform capture in industrial sensors and communication channel monitoring |
| Integral Nonlinearity | ±0.3 LSB maximum - ensures monotonic transfer function and guaranteed no missing codes across full scale |
| Power Dissipation @ 3 V | 5.1 mW maximum at 1 MSPS - enables continuous operation in thermally constrained handheld devices |
| Standby Current | 1 µA maximum - allows rapid wake-up from ultra-low-power sleep states in duty-cycled measurement systems |
Pinout & Package
AD7478AARM-REEL is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm × 0.9 mm), optimized for space-constrained PCB layouts and automated high-volume assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Single-supply rail powering analog core, digital interface, and internal reference - must be decoupled within 1 mm of pin |
| 2 - GND | Analog ground reference | Common return for all analog circuitry; requires dedicated low-impedance plane separate from digital ground |
| 3 - VIN | Analog input channel | Single-ended input with 0 V to VDD range; 20 pF input capacitance mandates low-source-impedance drive (<130 Ω) for full accuracy |
| 4 - CS | Chip select / conversion trigger | Active-low signal initiating both sampling and conversion; falling edge defines precise aperture instant |
| 5 - SDATA | Serial data output | Three-state CMOS output delivering 12-bit frame (4 leading zeros + 8 data bits + 4 trailing zeros), MSB first |
| 6 - SCLK | Serial clock input | Edge-triggered clock controlling data transfer and conversion timing; supports up to 20 MHz frequency |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic latency (≤600 ns conversion time) critical for closed-loop control and time-of-flight measurements |
| VDD-referenced ADC | Eliminates external voltage reference and associated BOM cost, layout area, and thermal drift sensitivity |
| SC70 footprint | Reduces board area by >50% vs. MSOP-8 variants while maintaining identical pinout compatibility across AD7476A/AD7477A/AD7478A family |
| 1 µA standby current | Supports microamp-level system sleep modes in battery-operated devices with sub-second wake-up response |
| SPI/QSPI/MICROWIRE compatible | Direct interfacing with common microcontrollers (e.g., STM32, MSP430) without protocol translation logic |
Applications
| Portable Medical Sensors | Optical Sensor Signal Chain |
|---|---|
Use Scenario: Digitizing photodiode current outputs in pulse oximeters and glucose monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Single-channel, low-latency ADC capturing analog front-end signals at ≤1 MSPS with minimal power overhead. Use Value: 8-bit resolution meets clinical SNR requirements for physiological waveform detection while enabling 10+ hour battery life via 1 µA standby mode. |
Use Scenario: Converting ambient light or proximity sensor outputs in smartphones and IoT nodes with strict size constraints. IC Role / Device Role / Timing Role: Compact, single-supply ADC interfacing directly to transimpedance amplifiers without external reference. Use Value: SC70 package fits beneath camera modules; VDD-referenced design avoids adding reference ICs in space-limited flex PCB assemblies. |
| Industrial Data Loggers | High-Speed Modem Monitoring |
Use Scenario: Sampling temperature, pressure, and humidity sensor outputs in remote environmental monitoring units. IC Role / Device Role / Timing Role: Low-power, wide-supply ADC acquiring multiple analog channels via external multiplexer at burst rates up to 1.2 MSPS. Use Value: 2.35 V minimum supply allows direct connection to aging lithium-thionyl chloride cells; 13.5 MHz input bandwidth preserves step-response fidelity. |
Use Scenario: Capturing baseband I/Q signals or AGC feedback voltages in DSL and cable modem PHY layers. IC Role / Device Role / Timing Role: High-throughput ADC providing real-time signal integrity metrics during link training and error correction. Use Value: 12-cycle serial interface synchronizes cleanly with DSP clock domains; 49 dB SINAD supports BER analysis up to QPSK modulation schemes. |
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 8-bit resolution and SC70-6 package, but uses leaded (Pb) termination instead of Pb-free; identical electrical specs and timing | Not suitable for RoHS-compliant production; acceptable for prototyping or legacy repair where Pb exemption applies | Select AD7478ARTZ-REEL7 only when Pb content is explicitly permitted and traceability to Pb-free supply chain is not required |
| ADS7822U | 8-bit, 200 kSPS max throughput; SPI-compatible but requires external reference; higher 1.25 mW typical power at 3 V | Limited to lower-speed sensing (e.g., slow thermistors); lacks VDD-referenced simplicity and 1.2 MSPS capability | Choose ADS7822U only when system already includes precision external reference and throughput demands are <250 kSPS |
Compared with AD7478AARM-REEL, AD7478ARTZ-REEL7 offers identical performance with non-RoHS packaging, while ADS7822U trades speed and integration for legacy compatibility - making AD7478AARM-REEL optimal for new designs requiring Pb-free compliance, high throughput, and reference-free operation.
Availability
AD7478AARM-REEL is available at Aetrix Electronics and suitable for portable medical sensors, optical sensor signal chains, industrial data loggers, and high-speed modem monitoring requiring stable component supply across automotive-grade temperature ranges (–40°C to +85°C).
Supply support for AD7478AARM-REEL 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 AD7476A/AD7477A/AD7478A family was designed to deliver high-speed, low-power SAR ADC functionality in the smallest possible footprint - specifically targeting space- and energy-constrained portable instrumentation and sensor interfaces.
FAQ
What is the maximum sampling rate supported by the AD7478AARM-REEL?
The AD7478AARM-REEL 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 specified across the full operating temperature range (–40°C to +85°C) and supply voltage range (2.35 V to 5.25 V), with timing validated per Table 4 in the Rev. G datasheet.
Does the AD7478AARM-REEL require an external voltage reference?
No, the AD7478AARM-REEL uses an internal reference derived from VDD, establishing a 0 V to VDD analog input range. This eliminates the need for external reference components, reduces BOM count, and simplifies layout - confirmed in the General Description and Pin Function Descriptions sections of the AD7476A/AD7477A/AD7478A datasheet Rev. G.
What package type and dimensions does the AD7478AARM-REEL use?
The AD7478AARM-REEL is supplied in a 6-lead SC70 package measuring 2.0 mm × 1.25 mm × 0.9 mm, with pin configuration matching Figure 5 in the Rev. G datasheet. This package is distinct from the 8-lead MSOP variant and is qualified for surface-mount reflow per JEDEC J-STD-020 standards.
How does the AD7478AARM-REEL handle power-down mode?
The AD7478AARM-REEL enters full power-down mode when CS remains high and SCLK is inactive, drawing ≤1 µA (typical 50 nA). Recovery to active conversion takes ≤1 µs, as specified in the Power-Up Time section. This mode is ideal for duty-cycled sensing applications where the ADC sleeps between measurement bursts.
Is the AD7478AARM-REEL compatible with SPI interface protocols?
Yes, the AD7478AARM-REEL supports SPI, QSPI, MICROWIRE, and generic DSP serial interfaces. Its SDATA output is three-state, data is MSB-first, and timing aligns with standard SPI clock polarity/phase conventions - verified in the Serial Interface and Timing Specifications sections of the Rev. G datasheet.
AD7478AARM-REEL 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-REEL FAQ
1.How can I place an order for AD7478AARM-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7478AARM-REEL 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-REEL reliable?
The price and inventory of AD7478AARM-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7478AARM-REEL is usually 5 days.
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AD7478AARM-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7478AARM-REEL 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-REEL?
For technical support, including AD7478AARM-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7478AARM-REEL requirements.
6.How does Aetrix verify that AD7478AARM-REEL is sourced from the original manufacturer or authorized distributors?
All AD7478AARM-REEL 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-REEL meets industry standards.
7.What is the process for return or replacement of AD7478AARM-REEL?
All AD7478AARM-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7478AARM-REEL, 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-REEL part is unused and in its original packaging.
Return procedure for AD7478AARM-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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