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Analog Devices Inc. AD7478SRTZ-REEL7
- Part No.:
- AD7478SRTZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
AD7478SRTZ-REEL7.pdf
- Description:
- IC ADC 8BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,943
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Product details
Overview
AD7478SRTZ-REEL7 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 AD7478SRTZ-REEL7 datasheet, AD7478SRTZ-REEL7 pinout, AD7478SRTZ-REEL7 application, or AD7478SRTZ-REEL7 equivalent, key selection criteria include its 8-bit resolution, 1 MSPS throughput, SPI-compatible serial interface, internal VDD-referenced analog input range (0 V to VDD), and guaranteed no-missed-codes performance - all in a space-constrained 6-lead SOT-23 footprint.
Technical Context
The AD7478SRTZ-REEL7 implements a standard successive-approximation register (SAR) architecture with no pipeline delay, sampling on the falling edge of CS and completing conversion in exactly 16 SCLK cycles. Its track-and-hold amplifier supports full-power bandwidth up to 6.5 MHz and acquires within 400 ns after conversion completion.
It uses VDD as the internal reference source, eliminating external reference components and enabling 0 V to VDD analog input range. Serial communication is SPI-/QSPI-/MICROWIRE-/DSP-compatible, with data output MSB-first and fixed framing: four leading zeros, eight data bits, and four trailing zeros.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete output codes with guaranteed no missed codes. |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to ~400 kHz Nyquist bandwidth. |
| SINAD | 49 dB min at 100 kHz input - defines usable dynamic range for medium-fidelity signal digitization. |
| Conversion Time | 800 ns max - enables tight timing control in high-speed synchronous acquisition systems. |
| Supply Range | 2.7 V to 5.25 V - compatible with single-cell Li-ion (3.0–3.6 V) and 5 V logic rails. |
| Power Dissipation | 4.8 mW max at 3 V / 1 MSPS - enables operation in thermally constrained handheld devices. |
| Standby Current | 1 μA max - allows ultra-low-power sleep states between measurement bursts. |
Pinout & Package
AD7478SRTZ-REEL7 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 body, and 1.1 mm height - optimized for high-density PCB layouts in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power Supply Input | Single 2.7–5.25 V rail powers analog core, digital interface, and internal reference - no external reference required. |
| GND (Pin 2) | Analog Ground Reference | Common return for analog input and internal circuitry; must be routed separately from digital ground to minimize noise coupling. |
| VIN (Pin 3) | Analog Input Channel | Single-ended input with 0 V to VDD range and 30 pF input capacitance - requires external RC anti-aliasing filter for >100 kHz signals. |
| SCLK (Pin 4) | Serial Clock Input | Controls conversion timing and data clocking; supports up to 20 MHz frequency - determines maximum throughput rate. |
| SDATA (Pin 5) | Serial Data Output | MSB-first 16-bit frame (4 zeros + 8 data + 4 zeros); tri-state capable; interfaces directly with SPI master without level-shifting at 3 V/5 V. |
| CS (Pin 6) | Chip Select / Conversion Trigger | Active-low signal initiates sampling on falling edge and frames serial data transfer - enables multi-device sharing of SCLK/SDATA lines. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic, cycle-accurate sampling control via CS edge - critical for time-triggered embedded systems. |
| VDD-referenced conversion | Eliminates need for external voltage reference and associated BOM cost, layout area, and thermal drift compensation. |
| Guaranteed no missed codes | Ensures monotonicity and predictable code transitions across full 8-bit range - essential for closed-loop control feedback paths. |
| Flexible power management | 1 μA shutdown current and scalable operational current (1.6 mA at 3 V) allow adaptive power scaling based on sampling duty cycle. |
| SPI-compatible serial interface | Direct interoperability with common microcontrollers (e.g., STM32, MSP430, nRF52) without protocol translation or glue logic. |
Applications
| Portable Medical Sensors | Optical Sensor Interfaces |
|---|---|
|
Use Scenario: Digitizing photodiode current outputs in pulse oximeters and glucose monitors where size, battery life, and signal fidelity are tightly constrained. IC Role / Device Role / Timing Role: Single-channel, event-triggered ADC capturing analog sensor outputs at ≤1 MSPS with sub-microsecond timing precision. Use Value: 8-bit resolution suffices for ratiometric measurements; 4.8 mW power at 3 V extends battery runtime; SOT-23 footprint saves board space in wearable form factors. |
Use Scenario: Converting ambient light or proximity sensor outputs in smart lighting controls and industrial presence detection modules. IC Role / Device Role / Timing Role: Low-latency analog front-end digitizer interfacing with I²C/SPI host controllers via shared serial bus. Use Value: Internal VDD reference eliminates calibration drift vs. temperature; 1 μA standby current enables always-on sensing with periodic wake-up. |
| Battery-Powered Data Loggers | Industrial Modem Front Ends |
|
Use Scenario: Sampling temperature, humidity, or pressure transducers in remote environmental monitoring nodes powered by coin cells or energy harvesters. IC Role / Device Role / Timing Role: Standalone, low-quiescent ADC performing burst-mode acquisition synchronized to MCU sleep/wake cycles. Use Value: No external reference or decoupling complexity reduces bill-of-materials; 6-lead SOT-23 simplifies automated assembly and rework. |
Use Scenario: Capturing analog line signals in DSL or PLC modems requiring fast, low-noise digitization before DSP-based demodulation. IC Role / Device Role / Timing Role: High-speed serial-output ADC feeding FPGA or DSP with deterministic 800 ns conversion latency. Use Value: 6.5 MHz full-power bandwidth supports baseband signal capture; SPI compatibility enables direct connection to Xilinx Zynq or TI C6000 processors. |
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 V only, 3-wire SPI, 2.25 mW at 3 V | Lower speed and narrower supply range; lacks 5 V tolerance and 1 MSPS capability | Select when lower throughput and strict 3 V operation are acceptable - not suitable for 5 V systems or burst-mode 1 MSPS sampling. |
| MAX11100ETT+ | 8-bit, 3 MSPS, internal reference, 10-lead µDFN, 7.5 mW at 3 V | Higher speed and different package; requires more PCB area and higher power | Choose for >1 MSPS needs or when µDFN thermal performance justifies layout redesign - not drop-in compatible due to pin count and footprint. |
Compared with ADS7822U and MAX11100ETT+, the AD7478SRTZ-REEL7 uniquely balances 1 MSPS throughput, 3–5 V supply flexibility, ultra-small SOT-23 packaging, and sub-5 mW power - making it optimal for space- and energy-constrained 8-bit acquisition where neither slower legacy nor higher-power alternatives meet the system-level trade-off.
Availability
AD7478SRTZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and optical sensor interfaces requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for AD7478SRTZ-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, serving industrial, automotive, communications, and healthcare markets.
The AD7476/AD7477/AD7478 family was designed specifically for space-constrained, low-power data acquisition - delivering high-speed SAR ADC functionality in the smallest possible footprint without sacrificing DC accuracy or dynamic performance.
FAQ
What is the maximum sampling rate supported by the AD7478SRTZ-REEL7?
The AD7478SRTZ-REEL7 supports a maximum throughput rate of 1 MSPS under specified conditions (VDD = 2.7 V to 5.25 V, fSCLK = 20 MHz). This is achieved with a fixed 16-clock-cycle conversion time, meaning the actual sampling rate is directly governed by the SCLK frequency and CS timing - no oversampling or interpolation is performed.
Does the AD7478SRTZ-REEL7 require an external voltage reference?
No, the AD7478SRTZ-REEL7 uses its VDD supply as the internal reference source, establishing a 0 V to VDD analog input range. This eliminates the need for external reference components, reducing BOM cost, PCB area, and thermal drift sensitivity - a key design advantage for compact, low-power systems.
What is the guaranteed missing-code performance of the AD7478SRTZ-REEL7?
The AD7478SRTZ-REEL7 guarantees no missing codes across its full 8-bit range. This is explicitly stated in the datasheet's DC Accuracy section, where differential nonlinearity is specified as ±0.5 LSB max - ensuring monotonic transfer function behavior essential for control loop stability and accurate threshold detection.
How does the AD7478SRTZ-REEL7 handle power-down mode?
The AD7478SRTZ-REEL7 enters full power-down mode when SCLK is held inactive and CS remains high, drawing ≤1 μA typical supply current. Recovery time from this state is 1 μs (typ), allowing rapid wake-up for burst-mode acquisition - ideal for duty-cycled sensor systems where average power must be minimized.
Is the AD7478SRTZ-REEL7 compatible with standard SPI interfaces?
Yes, the AD7478SRTZ-REEL7 is fully SPI-, QSPI-, MICROWIRE-, and DSP-compatible. It uses a 3-wire serial interface (SCLK, SDATA, CS), outputs data MSB-first, and requires no configuration registers - enabling direct connection to common microcontrollers without protocol translation or initialization overhead.
AD7478SRTZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -55°C ~ 125°C
- Supplier Device Package:
- SOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7478SRTZ-REEL7 FAQ
1.How can I place an order for AD7478SRTZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7478SRTZ-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 AD7478SRTZ-REEL7 reliable?
The price and inventory of AD7478SRTZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7478SRTZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7478SRTZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7478SRTZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7478SRTZ-REEL7?
AD7478SRTZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7478SRTZ-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 AD7478SRTZ-REEL7?
For technical support, including AD7478SRTZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7478SRTZ-REEL7 requirements.
6.How does Aetrix verify that AD7478SRTZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7478SRTZ-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 AD7478SRTZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7478SRTZ-REEL7?
All AD7478SRTZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7478SRTZ-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 AD7478SRTZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7478SRTZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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