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Analog Devices Inc. AD7476SRTZ-REEL
- Part No.:
- AD7476SRTZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
AD7476SRTZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,067
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Product details
Overview
AD7476SRTZ-REEL from Analog Devices is a 12-bit, successive-approximation analog-to-digital converter (ADC) in a 6-lead SOT-23 package, operating from 2.35 V to 5.25 V with 1 MSPS throughput, 70 dB SNR at 100 kHz input, and 3.6 mW power dissipation at 3 V - used in portable medical instruments and battery-powered data acquisition systems.
For engineers reviewing the AD7476SRTZ-REEL datasheet, AD7476SRTZ-REEL pinout, AD7476SRTZ-REEL application, or AD7476SRTZ-REEL equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives, and supply support for high-reliability embedded sensing.
Technical Context
The AD7476SRTZ-REEL 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 internal track-and-hold amplifier supports full-power bandwidth up to 6.5 MHz and handles input frequencies beyond 6 MHz.
Conversion timing is fully synchronous to the external serial clock (SCLK); throughput rate scales directly with SCLK frequency (up to 20 MHz for A version), enabling flexible power/throughput trade-offs. The reference is derived internally from VDD, fixing the analog input range to 0 V to VDD without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 1 LSB = VDD / 4096 quantization step, enabling precise measurement of small analog signals in low-voltage systems. |
| Throughput Rate | 1 MSPS - supports real-time sampling of fast transients in optical sensors and high-speed modems without buffering. |
| SNR @ 100 kHz | 70 dB min - ensures ≥11.3 effective bits for clean digitization of audio-band and instrumentation signals. |
| Power Dissipation | 3.6 mW at 3 V / 1 MSPS - enables continuous operation in energy-constrained PDA and wearable medical devices. |
| Analog Input Range | 0 V to VDD - eliminates need for external level-shifting or reference buffers when interfacing with single-supply sensors. |
| Serial Interface | SPI-/QSPI-/MICROWIRE-/DSP-compatible - allows direct connection to common microcontrollers without protocol translation. |
| Standby Current | 1 μA max - reduces quiescent power by >3000× during idle periods in battery-backed data loggers. |
Pinout & Package
AD7476SRTZ-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 thermal resistance θJA = 230°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Single 2.35–5.25 V rail powers both analog and digital sections; also serves as internal reference source for full-scale ADC range. |
| GND (Pin 2) | Analog ground reference | Common return for VIN, internal circuitry, and noise-sensitive analog paths - must be connected to clean system AGND plane. |
| 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. |
| SCLK (Pin 4) | Serial clock input | Controls conversion timing and data clocking; accepts 10 kHz–20 MHz (A version), determines throughput and average power consumption. |
| SDATA (Pin 5) | Serial data output | MSB-first 16-bit frame: four leading zeros + 12-bit result + zero padding; tri-state capable for bus sharing. |
| CS (Pin 6) | Chip select / conversion trigger | Active-low signal initiates sampling on falling edge and frames serial data transfer - enables precise timing control in multi-ADC systems. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Guarantees deterministic 16-cycle conversion latency and exact sampling instant control via CS edge - critical for time-critical closed-loop control. |
| Flexible clock-speed management | Throughput scales linearly with SCLK; reducing clock frequency lowers average current - enables dynamic power scaling in burst-mode sensing. |
| Internal VDD-referenced conversion | Eliminates external voltage reference and associated BOM cost, layout area, and drift sources - simplifies design for cost-sensitive portable systems. |
| 6-lead SOT-23 footprint | Smallest available package for 12-bit 1 MSPS SAR ADCs - saves PCB space in space-constrained applications like handheld diagnostics. |
| 1 μA shutdown mode | Enables ultra-low-power sleep states in intermittent-sampling architectures such as environmental sensor nodes with long wake intervals. |
Applications
| Portable Medical Instruments | Battery-Powered Data Acquisition |
|---|---|
|
Use Scenario: Continuous vital sign monitoring in handheld ECG or pulse oximeter units with limited battery capacity and strict size constraints. IC Role / Device Role / Timing Role: Primary ADC digitizing analog front-end sensor outputs at 1 MSPS with precise sampling triggered by CS for artifact-free waveform capture. Use Value: 70 dB SNR preserves diagnostic fidelity of low-amplitude bio-signals; 3.6 mW power enables >72-hour operation on a single CR2032 cell. |
Use Scenario: Field-deployable environmental sensor node logging temperature, pressure, and humidity over extended periods using intermittent sampling. IC Role / Device Role / Timing Role: Low-power SAR ADC acquiring synchronized multi-channel readings under microcontroller control, entering 1 μA shutdown between samples. Use Value: Internal VDD reference removes external component dependency; 6-lead SOT-23 minimizes PCB area while maintaining 12-bit resolution for calibrated sensor outputs. |
| Optical Sensor Interfaces | High-Speed Modem Signal Conditioning |
|
Use Scenario: Digitizing fast transient outputs from photodiode amplifiers in industrial laser alignment systems requiring sub-microsecond response. IC Role / Device Role / Timing Role: High-bandwidth ADC capturing rapid light-intensity changes with 6.5 MHz full-power bandwidth and <10 ns aperture jitter. Use Value: 1 MSPS throughput and 500 ns track-and-hold acquisition enable accurate reconstruction of nanosecond-scale optical pulses without aliasing. |
Use Scenario: Baseband signal sampling in compact DSL or PLC modems where board space and power efficiency are tightly constrained. IC Role / Device Role / Timing Role: Serial-interface ADC interfacing directly with DSP via SPI-compatible protocol, supporting burst-mode ADC reads during symbol processing windows. Use Value: SPI/QSPI/MICROWIRE compatibility eliminates interface glue logic; 16-cycle deterministic latency simplifies real-time firmware timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200 kSPS max, 3 V only, SPI interface, 6-pin SOT-23 | Limited to lower-resolution, lower-throughput applications such as basic battery monitoring or simple sensor readouts | Select when 8-bit accuracy suffices and system clock is <5 MHz; not suitable for 12-bit signal fidelity requirements. |
| MAX1116EUT+T | 12-bit, 1 MSPS, 2.7–3.6 V supply, SPI-compatible, 6-pin SOT-23, but no VDD-referenced input range (requires external reference) | Requires external precision reference and level-shifting for full-scale 0–VDD input - increases BOM count and layout complexity | Choose only if external reference is already present; AD7476SRTZ-REEL avoids reference-related drift and cost in new designs. |
Compared with ADS7822U and MAX1116EUT+T, AD7476SRTZ-REEL uniquely combines true 12-bit resolution, 1 MSPS throughput, VDD-referenced input, and 6-lead SOT-23 in a single device - delivering higher fidelity, simpler layout, and broader supply flexibility without sacrificing size or power.
Availability
AD7476SRTZ-REEL is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered data acquisition systems, optical sensor interfaces, and high-speed modem signal conditioning requiring stable component supply across production lifecycles.
Supply support for AD7476SRTZ-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, serving industrial, automotive, communications, and healthcare markets with precision signal chain solutions.
AD7476SRTZ-REEL belongs to Analog Devices' micropower SAR ADC product line, engineered specifically for space- and energy-constrained portable instrumentation where 12-bit accuracy, 1 MSPS speed, and minimal footprint are simultaneously required.
FAQ
What is the maximum sampling rate supported by the AD7476SRTZ-REEL?
The AD7476SRTZ-REEL 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, making the actual rate directly dependent on the applied SCLK frequency. At lower clock speeds, throughput scales proportionally - e.g., 10 MHz SCLK yields 625 kSPS.
Does the AD7476SRTZ-REEL require an external voltage reference?
No, the AD7476SRTZ-REEL uses an internal reference derived from VDD, establishing a full-scale analog input range of 0 V to VDD. This eliminates the need for external reference components, reducing BOM cost, PCB area, and potential drift sources - a key advantage over alternatives like MAX1116EUT+T that mandate external references.
What is the function of the CS pin on the AD7476SRTZ-REEL?
The CS (chip select) pin on the AD7476SRTZ-REEL serves two synchronized roles: it initiates sampling on its falling edge and frames the serial data transfer. This dual function enables precise control over sampling instant and data window timing - essential for deterministic acquisition in real-time control and synchronized multi-ADC systems.
Can the AD7476SRTZ-REEL operate from a 2.5 V supply?
Yes, the AD7476SRTZ-REEL is specified to operate from 2.35 V to 5.25 V, including 2.5 V. At 2.5 V, typical IDD in operational mode is 1.4 mA (max), yielding ~3.5 mW power dissipation at 1 MSPS - maintaining full 12-bit performance and 70 dB SNR while extending battery life in ultra-low-voltage portable systems.
How does the AD7476SRTZ-REEL handle power-down states?
The AD7476SRTZ-REEL features a full power-down mode with maximum current draw of 1 μA when SCLK is inactive, dropping to 80 μA if SCLK remains active. This mode retains configuration and enables fast wake-up (<1 μs power-up time), making it ideal for duty-cycled applications like wireless sensor nodes where the ADC sleeps between periodic measurements.
AD7476SRTZ-REEL 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:
- 12
- Sampling Rate (Per Second):
- 600k
- 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:
- 2.35V ~ 5.25V
- Voltage - Supply, Digital:
- 2.35V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- SOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7476SRTZ-REEL FAQ
1.How can I place an order for AD7476SRTZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7476SRTZ-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 AD7476SRTZ-REEL reliable?
The price and inventory of AD7476SRTZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7476SRTZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7476SRTZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7476SRTZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7476SRTZ-REEL?
AD7476SRTZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7476SRTZ-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 AD7476SRTZ-REEL?
For technical support, including AD7476SRTZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7476SRTZ-REEL requirements.
6.How does Aetrix verify that AD7476SRTZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7476SRTZ-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 AD7476SRTZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7476SRTZ-REEL?
All AD7476SRTZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7476SRTZ-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 AD7476SRTZ-REEL part is unused and in its original packaging.
Return procedure for AD7476SRTZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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