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Analog Devices Inc. AD7478AARMZ-REEL
- Part No.:
- AD7478AARMZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7478AARMZ-REEL.pdf
- Description:
- IC ADC 8BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,937
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Product details
Overview
AD7478AARMZ-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 a 6-lead SC70 package, 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 - optimized for space-constrained, battery-powered data acquisition in portable instrumentation.
For engineers reviewing the AD7478AARMZ-REEL datasheet, AD7478AARMZ-REEL pinout, AD7478AARMZ-REEL application, or AD7478AARMZ-REEL equivalent, this page delivers verified specifications, SC70 terminal mapping, real-world use cases in optical sensing and mobile communications, and two validated alternative parts with documented functional and parametric differences.
Technical Context
The AD7478AARMZ-REEL implements a standard SAR architecture with no pipeline delay, using CS to initiate sampling on its falling edge and control serial framing. Conversion timing is fully determined by SCLK frequency - requiring exactly 12 clock cycles per conversion at up to 20 MHz.
It employs an internal track-and-hold amplifier with 13.5 MHz full-power bandwidth and 225 ns acquisition time, referenced directly to VDD to enable 0 V to VDD analog input range. Digital interface is SPI/QSPI/MICROWIRE/DSP-compatible with MSB-first serial output containing four leading zeros followed by eight data bits and four trailing zeros.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - supports compact digital processing in low-complexity embedded systems without oversampling. |
| Throughput Rate | 1.2 MSPS maximum - enables real-time sampling of signals up to ~600 kHz Nyquist bandwidth. |
| Supply Voltage Range | 2.35 V to 5.25 V - compatible with single-cell Li-ion (3.0–3.7 V), 3.3 V, and 5 V logic domains. |
| SINAD @ 100 kHz | 49 dB minimum - defines usable dynamic range for medium-fidelity sensor digitization. |
| INL / DNL | ±0.3 LSB max each - guarantees monotonicity and no missing codes across full 8-bit range. |
| Power Dissipation @ 1 MSPS | 5.1 mW max at 5 V, 3 mW max at 3 V - enables operation in thermally constrained handheld devices. |
| Standby Current | 1 µA maximum - allows rapid wake-up from ultra-low-power sleep states. |
Pinout & Package
AD7478AARMZ-REEL is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm × 0.9 mm body, 0.65 mm pitch), optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power Supply Input | Single 2.35–5.25 V supply; also serves as internal reference source for 0–VDD analog input range. |
| 2 - GND | Analog Ground Reference | Common return for analog circuitry; must be connected to low-impedance system ground plane. |
| 3 - VIN | Analog Input Channel | Single-ended input accepting 0 V to VDD; 20 pF input capacitance requires low-source-impedance drive. |
| 4 - CS | Chip Select / Conversion Trigger | Active-low signal initiating sample-and-hold on falling edge and framing serial data output. |
| 5 - SDATA | Serial Data Output | Three-state CMOS output delivering 12-bit frame (4 leading zeros + 8 data bits + 4 trailing zeros) MSB first on SCLK falling edge. |
| 6 - SCLK | Serial Clock Input | Controls both conversion timing (12-cycle cycle) and data readout; supports up to 20 MHz operation. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True successive-approximation operation ensures deterministic 12-SCLK conversion latency with precise sampling instant control via CS. |
| VDD-referenced ADC | Eliminates need for external reference; simplifies BOM and supports rail-to-rail input range scaling with supply voltage. |
| Flexible power management | 1 µA standby current and dynamic power-down mode reduce average consumption during idle intervals in burst-sampling applications. |
| High-speed serial interface | SPI/QSPI/MICROWIRE/DSP compatibility enables direct connection to common microcontrollers and DSPs without level-shifting or protocol translation. |
| SC70 footprint | Smallest available package in the AD7476A/AD7477A/AD7478A family - saves >50% board area versus MSOP variant. |
Applications
| Portable Medical Sensors | Optical Sensor Interfaces |
|---|---|
Use Scenario: Digitizing photodiode current outputs in pulse oximeters and glucose monitors with limited PCB space and battery life constraints. IC Role / Device Role / Timing Role: Single-channel 8-bit ADC capturing analog front-end signals at ≤1 MSPS with minimal latency and low quiescent power. Use Value: Enables continuous monitoring with <5 µW standby power and 225 ns acquisition time, supporting fast response to physiological transients. |
Use Scenario: Converting ambient light or proximity sensor outputs in smartphones and wearables where size and power are critical. IC Role / Device Role / Timing Role: Low-pin-count ADC interfacing directly to I²C/SPI-capable MCUs via compact SC70 package and standard serial protocol. Use Value: Reduces system-level component count by eliminating external reference and decoupling capacitors while maintaining 49 dB SINAD fidelity. |
| Industrial Handheld Testers | Mobile Communication Front Ends |
Use Scenario: Sampling voltage/current feedback in portable multimeters and insulation testers powered by alkaline or Li-ion batteries. IC Role / Device Role / Timing Role: High-speed, rail-to-rail input ADC supporting wide supply range (2.35–5.25 V) and operating reliably across temperature extremes (−40°C to +85°C). Use Value: Delivers guaranteed monotonicity (±0.3 LSB INL/DNL) and 1.2 MSPS throughput without calibration, reducing firmware overhead. |
Use Scenario: Digitizing RF power detector or RSSI signals in cellular IoT modules where RF isolation and layout simplicity are essential. IC Role / Device Role / Timing Role: Isolated analog input channel with 13.5 MHz full-power bandwidth and low aperture jitter (30 ps typ) for stable RF envelope capture. Use Value: Supports accurate signal strength measurement across varying supply conditions without external buffering or gain staging. |
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 thinner 0.55 mm profile (vs. 0.9 mm for ARMZ); identical electrical specs. | Preferred for ultra-thin assemblies (e.g., smart cards, slim sensors) where Z-height is constrained. | Select AD7478ARTZ-REEL7 when mechanical stack-up limits total component height to ≤0.6 mm. |
| ADS7822U | 8-bit, 200 kSPS max, 2.7–5.25 V supply, MSOP-8 package; lower speed but integrated reference and higher SNR (62 dB). | Better suited for precision, low-speed industrial sensing where SNR >60 dB is required and throughput <200 kSPS suffices. | Choose ADS7822U when absolute accuracy and noise performance outweigh speed and size requirements. |
Compared with AD7478AARMZ-REEL, AD7478ARTZ-REEL7 offers identical functionality in a lower-profile SC70 variant, while ADS7822U trades speed and size for higher SNR and integrated reference - making the former ideal for space-critical designs and the latter for accuracy-focused, lower-throughput systems.
Availability
AD7478AARMZ-REEL is available at Aetrix Electronics and suitable for portable medical sensors, optical sensor interfaces, industrial handheld testers, and mobile communication front ends requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7478AARMZ-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 specifically for battery-powered, space-constrained data acquisition systems requiring high throughput, low power, and minimal external components - targeting portable instrumentation and sensor interface applications.
FAQ
What is the maximum sampling rate supported by the AD7478AARMZ-REEL?
The AD7478AARMZ-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 exactly 12 SCLK cycles. This timing is specified across the full operating temperature range (−40°C to +85°C) and supply range (2.35 V to 5.25 V), with no pipeline delay affecting latency determinism. The AD7478AARMZ-REEL maintains this rate without performance degradation under typical load conditions.
Does the AD7478AARMZ-REEL require an external voltage reference?
No, the AD7478AARMZ-REEL 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, reduces BOM cost and board area, and simplifies design for applications where input dynamic range tracks supply voltage - such as battery-monitoring circuits or single-supply sensor interfaces. The AD7478AARMZ-REEL does not support external reference inputs.
What are the key timing requirements for interfacing the AD7478AARMZ-REEL with an MCU?
Key timing parameters include: minimum CS pulse width of 10 ns; CS-to-SCLK setup time of 10 ns; SCLK low/high pulse widths ≥0.4×tSCLK; and SCLK-to-data valid hold time of 7 ns (VDD > 3.6 V). The AD7478AARMZ-REEL requires 12 SCLK cycles per conversion, and the SDATA output is three-stated 36 ns after the final SCLK falling edge. These values are guaranteed across all operating conditions and must be met to ensure reliable data capture.
How does the power consumption of the AD7478AARMZ-REEL scale with throughput?
AD7478AARMZ-REEL power scales linearly with sample rate: at 1 MSPS and 3 V supply, it consumes 3 mW maximum; at 5 V, 5.1 mW maximum. In full power-down mode, current drops to 1 µA max (50 nA typical), reducing power to 3 µW at 3 V. The AD7478AARMZ-REEL supports dynamic power management - lowering SCLK frequency during idle periods automatically reduces average power without compromising conversion integrity.
Is the AD7478AARMZ-REEL pin-compatible with other members of the AD7476A/AD7477A/AD7478A family?
Yes, the AD7478AARMZ-REEL shares identical pinout, package (SC70-6), and interface protocol with AD7476AARMZ-REEL and AD7477AARMZ-REEL. All three variants use the same VDD/GND/VIN/CS/SDATA/SCLK pin assignments and 12-/14-/16-bit serial frame formats (with differing zero padding). This allows hardware reuse across resolution grades - though firmware must handle different data lengths and performance envelopes (e.g., 49 dB SINAD for AD7478AARMZ-REEL vs. 71 dB for AD7476AARMZ-REEL).
AD7478AARMZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7478AARMZ-REEL FAQ
1.How can I place an order for AD7478AARMZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7478AARMZ-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 AD7478AARMZ-REEL reliable?
The price and inventory of AD7478AARMZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7478AARMZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7478AARMZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7478AARMZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7478AARMZ-REEL?
AD7478AARMZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7478AARMZ-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 AD7478AARMZ-REEL?
For technical support, including AD7478AARMZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7478AARMZ-REEL requirements.
6.How does Aetrix verify that AD7478AARMZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7478AARMZ-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 AD7478AARMZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7478AARMZ-REEL?
All AD7478AARMZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7478AARMZ-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 AD7478AARMZ-REEL part is unused and in its original packaging.
Return procedure for AD7478AARMZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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