My Inquiry
My Account
Analog Devices Inc. AD7478ARTZ-REEL
- Part No.:
- AD7478ARTZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
AD7478ARTZ-REEL.pdf
- Description:
- IC ADC 8BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,071
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7478ARTZ-REEL 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 - used for compact, battery-powered data acquisition in portable medical sensors and optical monitoring systems.
For engineers reviewing the AD7478ARTZ-REEL datasheet, AD7478ARTZ-REEL pinout, AD7478ARTZ-REEL application, or AD7478ARTZ-REEL equivalent, key selection considerations include its 8-bit resolution, single-supply operation, SPI-compatible serial interface, guaranteed no-missed-codes performance, and low-power standby mode (1 μA).
Technical Context
The AD7478ARTZ-REEL implements a standard successive-approximation register (SAR) architecture with internal track-and-hold, sampling on the falling edge of CS and initiating conversion immediately. It uses VDD as its reference, enabling a full-scale analog input range of 0 V to VDD without external components.
Its serial interface is SPI-/QSPI-/MICROWIRE-/DSP-compatible, requiring 16 SCLK cycles per conversion, with data output MSB-first and fixed framing: four leading zeros, eight data bits, then four trailing zeros. No pipeline delay is present, ensuring deterministic timing critical for real-time control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - supports basic digital representation of analog signals with 256 discrete levels, sufficient for threshold detection and moderate-fidelity sensor digitization. |
| Throughput Rate | 1 MSPS - enables sampling of signals up to ~500 kHz Nyquist bandwidth, suitable for ultrasound front-ends and high-speed optical pulse capture. |
| SINAD | 49 dB min at 100 kHz - defines usable dynamic range for 8-bit conversion; matches theoretical 50 dB limit, confirming minimal noise/distortion impact. |
| Conversion Time | 800 ns max - fixed latency per sample, enabling precise timing alignment in synchronized multi-channel systems or time-of-flight measurements. |
| Supply Range | 2.7 V to 5.25 V - allows direct interfacing with common logic rails (3.3 V, 5 V) and battery sources (e.g., two Li-ion cells), eliminating level-shifting circuitry. |
| Power Dissipation | 4.8 mW max at 3 V / 1 MSPS - enables continuous operation in space-constrained, thermally sensitive applications like wearable biosensors. |
| Standby Current | 1 μA max - supports ultra-low-power sleep modes in intermittently active systems such as wireless sensor nodes with duty-cycled sampling. |
Pinout & Package
AD7478ARTZ-REEL 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 1.1 mm height - optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power Supply Input | Single supply rail (2.7–5.25 V); also serves as internal reference - sets full-scale input range to 0 V to VDD, simplifying analog front-end design. |
| GND (Pin 2) | Analog Ground Reference | Common return for analog circuitry; must be star-connected to minimize noise coupling into the ADC's sensitive input path. |
| VIN (Pin 3) | Analog Input Channel | Single-ended input accepting 0 V to VDD range; 30 pF input capacitance requires careful driver impedance matching for settling accuracy. |
| SCLK (Pin 4) | Serial Clock Input | Controls both data transfer timing and internal conversion clock - maximum 20 MHz rate enables 1 MSPS throughput with 16-cycle frame. |
| SDATA (Pin 5) | Serial Data Output | MSB-first 16-bit frame: 4 leading zeros + 8 data bits + 4 trailing zeros; tri-state capable for bus sharing in multi-device configurations. |
| CS (Pin 6) | Chip Select / Conversion Trigger | Active-low signal that initiates sampling on falling edge and frames serial data - enables precise synchronization with external timing controllers or microcontrollers. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Deterministic 800 ns conversion latency ensures predictable timing for closed-loop feedback and real-time event capture without latency compensation. |
| Internal VDD reference | Eliminates need for external reference IC or resistor divider, reducing BOM count and layout area while maintaining ratiometric accuracy with supply variations. |
| Guaranteed no-missed-codes | Ensures monotonic transfer function across all 256 codes - critical for position sensing, incremental encoder interfaces, and safety-critical threshold detection. |
| SPI-compatible serial interface | Direct connection to standard microcontroller SPI peripherals without glue logic, supporting flexible clock rates and easy firmware integration. |
| 1 μA standby current | Enables microamp-level system sleep states; ideal for energy harvesting or coin-cell-powered devices requiring years of operational life between replacements. |
Applications
| Portable Medical Sensors | Optical Pulse Monitoring |
|---|---|
Use Scenario: Digitizing photodiode current from fingertip PPG (photoplethysmography) modules in wearable heart-rate monitors. IC Role / Device Role / Timing Role: Single-ended 8-bit SAR ADC acquiring analog pulse waveforms at 1 MSPS with precise CS-triggered sampling aligned to LED drive timing. Use Value: Low 4.8 mW power at 3 V extends battery life; 30 pF input capacitance minimizes loading on transimpedance amplifier output. |
Use Scenario: Capturing fast transient pulses from avalanche photodiodes in laser distance measurement units. IC Role / Device Role / Timing Role: High-speed digitizer synchronizing sampling to laser pulse trigger via CS input, capturing sub-microsecond rise-time events. Use Value: 800 ns conversion time and no pipeline delay enable accurate time-of-flight calculation without interpolation or latency correction. |
| Battery-Powered Data Loggers | Industrial Sensor Nodes |
Use Scenario: Periodic voltage monitoring of lithium battery packs in handheld test equipment with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Low-power ADC entering 1 μA standby between 100 ms sampling intervals, activated by microcontroller GPIO. Use Value: Standby current specification validated down to 1 μA max ensures predictable energy budgeting over multi-year deployments. |
Use Scenario: Digitizing temperature and pressure signals from MEMS sensors in factory-floor condition monitoring gateways. IC Role / Device Role / Timing Role: Compact 6-lead SOT-23 ADC integrated directly adjacent to sensor outputs, minimizing trace length and EMI susceptibility. Use Value: 2.7–5.25 V supply range accommodates wide-input DC-DC converter outputs, avoiding dedicated LDOs for ADC rail. |
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, 3.3 V only, 2.5 mW at 3.3 V, SPI interface, 8-pin SOIC | Lower speed and fixed supply limit suitability for high-throughput or wide-voltage designs | Select when lower power at reduced throughput is acceptable and SOIC packaging is preferred for manual assembly. |
| MAX11100ETT+ | 8-bit, 3 MSPS, 2.7–3.6 V, 5.5 mW at 3 V, SPI, 6-pin TDFN | Higher speed but narrower supply range and larger package thermal resistance (θJA = 200°C/W vs. 230°C/W) | Prefer when >1 MSPS sampling is required and board space allows TDFN; verify thermal margin under continuous operation. |
Compared with ADS7822U and MAX11100ETT+, the AD7478ARTZ-REEL uniquely balances 1 MSPS throughput, 2.7–5.25 V flexibility, and SOT-23 compactness - making it optimal for cost-sensitive, space-constrained, battery-operated systems where full 5 V compatibility and minimal layout overhead are essential.
Availability
AD7478ARTZ-REEL is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, optical sensors, and industrial sensor nodes requiring stable component supply across production lifecycles.
Supply support for AD7478ARTZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD7476/AD7477/AD7478 family was designed for ultra-compact, low-power data acquisition in portable and energy-constrained systems - emphasizing minimal footprint, single-supply simplicity, and deterministic SAR timing.
FAQ
What is the maximum sampling rate supported by the AD7478ARTZ-REEL?
The AD7478ARTZ-REEL supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz serial clock and 16 SCLK cycles per conversion. This rate is specified across the full operating temperature range (−40°C to +85°C) and supply range (2.7 V to 5.25 V), enabling reliable high-speed digitization in demanding portable applications.
Does the AD7478ARTZ-REEL require an external voltage reference?
No, the AD7478ARTZ-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 system cost and board area, and maintains ratiometric accuracy - meaning output codes scale proportionally with supply voltage variations.
How does the AD7478ARTZ-REEL handle power-down mode?
The AD7478ARTZ-REEL enters full power-down mode when SCLK is held inactive and CS remains high, drawing ≤1 μA typical current. Recovery time from this state is 1 μs, allowing rapid reactivation for burst-mode sampling - a key feature for extending battery life in intermittent-sensing applications using the AD7478ARTZ-REEL.
What is the analog input structure of the AD7478ARTZ-REEL?
The AD7478ARTZ-REEL features a single-ended analog input (VIN) with a 0 V to VDD range, 30 pF input capacitance, and ±1 μA DC leakage. It includes an integrated track-and-hold amplifier with 400 ns acquisition time for sine-wave inputs ≤100 kHz, enabling accurate sampling without external buffering in most low-bandwidth sensor interfaces.
Is the AD7478ARTZ-REEL pin-compatible with other members of the AD7476/AD7477/AD7478 family?
Yes, the AD7478ARTZ-REEL shares identical pinout, package (6-lead SOT-23), and serial interface protocol with AD7476ARTZ-REEL and AD7477ARTZ-REEL. This allows hardware reuse across 8-, 10-, and 12-bit variants - designers can select resolution based on system requirements without modifying PCB layout or firmware I/O mapping for the AD7478ARTZ-REEL.
AD7478ARTZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-REEL FAQ
1.How can I place an order for AD7478ARTZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7478ARTZ-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 AD7478ARTZ-REEL reliable?
The price and inventory of AD7478ARTZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7478ARTZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7478ARTZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7478ARTZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7478ARTZ-REEL?
AD7478ARTZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7478ARTZ-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 AD7478ARTZ-REEL?
For technical support, including AD7478ARTZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7478ARTZ-REEL requirements.
6.How does Aetrix verify that AD7478ARTZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7478ARTZ-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 AD7478ARTZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7478ARTZ-REEL?
All AD7478ARTZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7478ARTZ-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 AD7478ARTZ-REEL part is unused and in its original packaging.
Return procedure for AD7478ARTZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7478ARTZ-REEL Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
