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Analog Devices Inc. AD7476SRTZ-500RL7
- Part No.:
- AD7476SRTZ-500RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
AD7476SRTZ-500RL7.pdf
- Description:
- IC ADC 12BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:767
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Product details
Overview
AD7476SRTZ-500RL7 from Analog Devices is a 12-bit, 1 MSPS successive-approximation ADC in a 6-lead SOT-23 package, operating from 2.35 V to 5.25 V supply, delivering 70 dB SNR at 100 kHz input, with no pipeline delay and SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface. It serves as the primary analog-to-digital converter in compact, battery-powered data acquisition nodes.
For engineers reviewing the AD7476SRTZ-500RL7 datasheet, AD7476SRTZ-500RL7 pinout, AD7476SRTZ-500RL7 application, or AD7476SRTZ-500RL7 equivalent, this page provides verified technical context, exact pin functions, real-world use-value per application, confirmed alternative parts with documented functional and application differences, and supply-chain support for volume deployment.
Technical Context
The AD7476SRTZ-500RL7 implements a standard successive-approximation register (SAR) architecture with internal track-and-hold, sampling on the falling edge of CS and initiating conversion immediately. Its reference is derived directly from VDD, enabling a full-scale analog input range of 0 V to VDD without external reference components.
Conversion timing is fully synchronous to SCLK - requiring exactly 16 clock cycles per sample - with no latency or pipeline stages. The device supports flexible power management via shutdown mode (≤1 μA), and its digital interface operates across 10 kHz–20 MHz SCLK, compatible with common microcontroller SPI peripherals without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes for high-fidelity signal digitization in precision sensing. |
| Throughput Rate | 1 MSPS - enables real-time capture of signals up to ~500 kHz Nyquist bandwidth in continuous sampling. |
| SNR @ 100 kHz | 70 dB min - ensures ≥11.3 effective number of bits (ENOB) for clean baseband signal reconstruction. |
| Supply Range | 2.35 V to 5.25 V - supports direct interfacing with Li-ion, 3.3 V, and 5 V logic domains without regulators. |
| Power @ 1 MSPS / 3 V | 4.2 mW max - allows sustained high-speed operation in energy-constrained portable instruments. |
| Aperture Jitter | 30 ps typ - limits sampling uncertainty to <0.06% of LSB at 100 kHz, preserving dynamic accuracy. |
| INL / DNL | ±1.5 LSB max / −0.9/+1.5 LSB max - guarantees monotonicity and no missing codes across full temperature range. |
Pinout & Package
AD7476SRTZ-500RL7 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 max height - optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Single 2.35–5.25 V rail powers analog core, reference, and digital interface; also serves as internal reference source. |
| GND (Pin 2) | Analog ground reference | Common return for VIN, internal circuitry, and noise-sensitive analog paths; must be low-impedance and separated from digital ground. |
| VIN (Pin 3) | Analog input channel | Single-ended input with 0 V to VDD range, 30 pF input capacitance, and ±1 μA leakage - requires external RC anti-aliasing filter. |
| SCLK (Pin 4) | Serial clock input | Edge-triggered master clock (10 kHz–20 MHz); controls both data transfer timing and conversion cycle duration (16 cycles/sample). |
| SDATA (Pin 5) | Serial data output | MSB-first 16-bit frame: four leading zeros + 12-bit result + no trailing bits; tri-state enabled by CS; 10 pF output capacitance. |
| CS (Pin 6) | Chip select / conversion trigger | Active-low signal that initiates sampling on falling edge and frames serial data; defines start of conversion and data window. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True single-cycle conversion with deterministic 0.8 μs time from CS fall to data ready - eliminates timing uncertainty in closed-loop control. |
| Internal VDD-referenced ADC | Eliminates need for external voltage reference or buffer, reducing BOM count and layout area while maintaining 0–VDD input flexibility. |
| 1 μA shutdown current | Enables ultra-low-power sleep states between measurements - critical for multi-year battery life in remote sensor nodes. |
| SPI/QSPI/MICROWIRE/DSP compatibility | Direct connection to industry-standard microcontrollers (e.g., STM32, ADSP-BF5xx, C2000) without protocol translation or glue logic. |
| Wide supply range (2.35–5.25 V) | Supports direct integration into mixed-voltage systems - e.g., 3.3 V MCU with 5 V sensor front-end or 2.5 V battery monitoring rails. |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous 1 MSPS sampling of ECG or pulse oximetry analog front-ends in handheld diagnostic devices powered by coin-cell or LiPo batteries. IC Role / Device Role / Timing Role: Primary SAR ADC performing single-ended analog-to-digital conversion with precise CS-synchronized sampling and zero-latency readout. Use Value: 70 dB SNR preserves clinical-grade waveform fidelity; 4.2 mW @ 3 V extends battery runtime beyond 72 hours at full rate. |
Use Scenario: Digitizing amplified transducer outputs (e.g., pressure, temperature, accelerometer) in FDA-cleared wearable monitors. IC Role / Device Role / Timing Role: High-speed, low-noise ADC capturing transient physiological events with accurate timestamp alignment via CS edge triggering. Use Value: ±1.5 LSB INL ensures diagnostic accuracy compliance; SOT-23 footprint enables miniaturized flex PCB integration. |
| Industrial Field Transmitters | Optical Sensor Signal Conditioning |
Use Scenario: Converting 4–20 mA loop-powered sensor outputs in hazardous-area process controllers with tight thermal budgets. IC Role / Device Role / Timing Role: Precision ADC interfacing with op-amp I/V converters, referenced to local VDD, with robust 30 ps aperture jitter. Use Value: −55°C to +125°C S-version qualification (AD7476S) supports extended industrial temperature operation; 1 μA shutdown aids thermal management. |
Use Scenario: Digitizing fast-response photodiode or CCD outputs in optical encoders, spectrometers, or laser alignment tools. IC Role / Device Role / Timing Role: Wide-input-bandwidth (6.5 MHz) ADC capturing high-frequency optical modulation without aliasing. Use Value: 70 dB SNR at 100 kHz enables >10-bit ENOB for sub-micron position resolution; 16-cycle deterministic timing simplifies FPGA synchronization. |
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 |
|---|---|---|---|
| AD7476ARTZ-REEL7 | Same die, A-grade (−40°C to +85°C), identical specs except wider temp range; same SOT-23-6 package and pinout. | Targeted at commercial/industrial equipment where extended temperature operation is not required. | Select when cost sensitivity outweighs military-temperature needs and full S-version qualification is unnecessary. |
| ADS7822U | 12-bit, 200 kSPS, 8-pin SOIC; uses external reference; higher power (1.25 mW @ 200 kSPS); no VDD-referenced mode. | Suitable for lower-speed, board-space-tolerant designs where external reference improves absolute accuracy. | Choose only if throughput ≤200 kSPS suffices and SOIC layout is acceptable; not drop-in due to speed, package, and reference architecture mismatch. |
Compared with AD7476SRTZ-500RL7, the AD7476ARTZ-REEL7 offers identical performance at lower cost in commercial environments, while the ADS7822U trades speed and integration for external reference flexibility - making the AD7476SRTZ-500RL7 optimal for compact, high-throughput, single-supply systems demanding guaranteed military-temperature operation.
Availability
AD7476SRTZ-500RL7 is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical sensors, industrial field transmitters, and optical sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7476SRTZ-500RL7 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, headquartered in Norwood, MA, with design and manufacturing expertise spanning over 50 years.
The AD7476/AD7477/AD7478 family was engineered for ultra-compact, low-power, high-speed data acquisition in space- and energy-constrained systems - prioritizing minimal footprint, single-supply simplicity, and deterministic timing without sacrificing DC or AC accuracy.
FAQ
What is the maximum sampling rate supported by the AD7476SRTZ-500RL7?
The AD7476SRTZ-500RL7 supports a maximum throughput rate of 1 MSPS under specified conditions: VDD = 2.7 V to 5.25 V, fSCLK = 20 MHz, and TA = −55°C to +125°C. This requires a minimum SCLK period of 50 ns (20 MHz), and each conversion consumes exactly 16 SCLK cycles, resulting in a fixed 0.8 μs conversion time. The AD7476SRTZ-500RL7 achieves this rate without pipeline delay or latency, making it suitable for real-time signal capture in time-critical applications.
Does the AD7476SRTZ-500RL7 require an external voltage reference?
No, the AD7476SRTZ-500RL7 does not require an external voltage reference. Its internal reference is derived directly from the VDD supply, establishing a full-scale analog input range of 0 V to VDD. This architecture eliminates the need for external reference ICs, buffers, or decoupling networks - reducing system cost, board area, and design complexity. However, analog input accuracy remains dependent on VDD stability and noise, so proper power supply filtering is essential for optimal performance.
What are the key timing requirements for interfacing the AD7476SRTZ-500RL7 with an MCU SPI peripheral?
Interfacing the AD7476SRTZ-500RL7 with an MCU SPI peripheral requires strict adherence to three timing constraints: (1) CS must remain low for ≥10 ns before the first SCLK falling edge to initiate sampling; (2) SCLK must operate between 10 kHz and 20 MHz with 40/60–60/40 mark/space ratio; and (3) SDATA becomes valid ≤70 ns after each SCLK falling edge (A version). The AD7476SRTZ-500RL7 outputs 16-bit frames (four leading zeros + 12-bit result) MSB-first, with data latched on SCLK falling edges - matching standard SPI Mode 0 (CPOL = 0, CPHA = 0) configurations.
How does the AD7476SRTZ-500RL7 handle power management in low-duty-cycle applications?
The AD7476SRTZ-500RL7 supports two low-power states: normal operational mode (≤3 mA at 1 MSPS, 3 V) and full power-down mode (≤1 μA with SCLK inactive). In low-duty-cycle applications, the host system can assert CS high and disable SCLK between conversions to enter shutdown, reducing average current to microamp levels. Recovery time from shutdown is 1 μs, allowing rapid reactivation for burst-mode sampling. This capability makes the AD7476SRTZ-500RL7 ideal for wake-on-event sensor nodes where power budget is dominated by quiescent consumption.
Is the AD7476SRTZ-500RL7 pin-compatible with other members of the AD7476/AD7477/AD7478 family?
Yes, the AD7476SRTZ-500RL7 is pin-compatible with all variants in the AD7476/AD7477/AD7478 family - including AD7477 and AD7478 - sharing identical 6-lead SOT-23 pinout (VDD, GND, VIN, SCLK, SDATA, CS), identical logic thresholds, and identical serial interface protocol. However, resolution (12/10/8-bit), dynamic performance (SNR, THD), and DC accuracy (INL/DNL) differ across variants. Swapping requires firmware updates to handle different data widths and recalibration to account for accuracy shifts, but no PCB changes are needed.
AD7476SRTZ-500RL7 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-500RL7 FAQ
1.How can I place an order for AD7476SRTZ-500RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7476SRTZ-500RL7 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-500RL7 reliable?
The price and inventory of AD7476SRTZ-500RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7476SRTZ-500RL7 is usually 5 days.
3.What payment methods are accepted for AD7476SRTZ-500RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7476SRTZ-500RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7476SRTZ-500RL7?
AD7476SRTZ-500RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7476SRTZ-500RL7 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-500RL7?
For technical support, including AD7476SRTZ-500RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7476SRTZ-500RL7 requirements.
6.How does Aetrix verify that AD7476SRTZ-500RL7 is sourced from the original manufacturer or authorized distributors?
All AD7476SRTZ-500RL7 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-500RL7 meets industry standards.
7.What is the process for return or replacement of AD7476SRTZ-500RL7?
All AD7476SRTZ-500RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7476SRTZ-500RL7, 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-500RL7 part is unused and in its original packaging.
Return procedure for AD7476SRTZ-500RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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