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Analog Devices Inc. AD7476SRTZ-R2
- Part No.:
- AD7476SRTZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
AD7476SRTZ-R2.pdf
- Description:
- IC ADC 12BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:390
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Product details
Overview
AD7476SRTZ-R2 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 and consuming only 3.6 mW at 3 V. It serves as a high-speed, low-power analog-to-digital converter for battery-constrained signal acquisition systems.
For engineers reviewing the AD7476SRTZ-R2 datasheet, AD7476SRTZ-R2 pinout, AD7476SRTZ-R2 application, or AD7476SRTZ-R2 equivalent, key selection considerations include its 12-bit resolution with ±1.5 LSB INL, no pipeline delay, SPI-compatible serial interface, and guaranteed no missing codes - critical for precision data acquisition in portable instrumentation and sensor interfaces.
Technical Context
The AD7476SRTZ-R2 implements a standard successive-approximation register (SAR) architecture with integrated track-and-hold, sampling on the falling edge of CS and completing conversion in exactly 16 SCLK cycles. Its reference is internally derived from VDD, enabling a full-scale input range of 0 V to VDD without external reference components.
Timing is fully controlled by the external serial clock (SCLK); conversion rate scales directly with SCLK frequency (up to 20 MHz for A-version), and the device supports standby mode with ≤1 μA quiescent current. Input bandwidth exceeds 6 MHz, and aperture jitter is specified at 30 ps typ, supporting accurate digitization of high-frequency signals up to 100 kHz with 70 dB SNR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output levels for high-fidelity signal representation |
| Throughput Rate | 1 MSPS - enables real-time sampling of signals up to ~500 kHz Nyquist bandwidth |
| SNR @ 100 kHz | 70 dB min - supports >11.3 effective number of bits (ENOB) for clean signal capture |
| Supply Range | 2.35 V to 5.25 V - compatible with single-cell Li-ion, 3.3 V, and 5 V logic domains |
| Power @ 1 MSPS / 3 V | 3.6 mW - enables >1000 conversions per joule in energy-sensitive applications |
| INL / DNL | ±1.5 LSB max / −0.9/+1.5 LSB max - ensures monotonicity and no missing codes across full scale |
| Aperture Jitter | 30 ps typ - limits sampling uncertainty to <0.1 LSB error at 100 kHz input |
Pinout & Package
AD7476SRTZ-R2 is housed in a RoHS-compliant, lead-free 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 analog core, digital interface, and internal reference |
| GND (Pin 2) | Analog ground reference | Common return for VIN, internal circuitry, and noise-sensitive analog paths |
| VIN (Pin 3) | Single-ended analog input | Accepts 0 V to VDD full-scale unipolar signals; 30 pF input capacitance requires careful driver design |
| SCLK (Pin 4) | Serial clock input | Controls conversion timing and data clocking; supports up to 20 MHz for 1 MSPS operation |
| SDATA (Pin 5) | Serial data output | MSB-first 16-bit frame: four leading zeros + 12-bit result + no trailing bits (AD7476-specific format) |
| CS (Pin 6) | Active-low chip select | Initiates conversion on falling edge; frames serial data transfer and enables multi-device sharing |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR architecture provides deterministic 16-cycle conversion time with precise sampling control via CS |
| Internal VDD-referenced ADC | Eliminates need for external reference; maximizes dynamic range with 0 V to VDD input compliance |
| SPI/QSPI/MICROWIRE/DSP compatibility | Direct interface to common microcontrollers without protocol translation or glue logic |
| Ultra-low standby current | ≤1 μA shutdown current extends battery life in intermittent-sampling systems |
| Wide input bandwidth | 6.5 MHz full-power bandwidth supports anti-aliasing filter design for signals up to 100 kHz |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous voltage/current monitoring in handheld ECG or pulse oximeter units powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary ADC acquiring analog biosignals at 100–500 kSPS with minimal power overhead and no latency-induced phase distortion. Use Value: 3.6 mW at 3 V and 1 μA standby enable >1-week runtime on a single CR2032 cell while maintaining 12-bit fidelity for diagnostic-grade waveform capture. |
Use Scenario: Digitizing transducer outputs (e.g., pressure, temperature, SpO₂ photodiode) in FDA-cleared wearable monitors. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with guaranteed no missing codes and low INL for calibrated sensor linearization. Use Value: ±1.5 LSB INL and 70 dB SNR ensure reliable detection of sub-millivolt physiological variations without post-acquisition correction. |
| Industrial Sensor Transmitters | Optical Communication Receivers |
Use Scenario: 4–20 mA loop-powered field sensors converting RTD or strain gauge outputs in harsh environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Precision SAR ADC interfacing directly to low-noise instrumentation amplifiers, referenced to local VDD. Use Value: Operation down to 2.35 V and robust 30 ps aperture jitter maintain accuracy despite supply ripple and ambient temperature swings. |
Use Scenario: Monitoring bias currents and photodiode outputs in fiber-optic receiver modules requiring fast response to optical power fluctuations. IC Role / Device Role / Timing Role: High-speed acquisition node capturing transient events (e.g., burst-mode optical pulses) with deterministic 1 MSPS timing. Use Value: 1 MSPS throughput and 6.5 MHz bandwidth allow faithful reconstruction of optical envelope dynamics without undersampling artifacts. |
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, tape-and-reel packaging (3000 pcs), identical electrical specs and pinout | No functional difference; optimized for automated SMT assembly vs. cut-tape (R2) | Select AD7476ARTZ-REEL7 for high-volume production; AD7476SRTZ-R2 suits prototyping and low-quantity builds |
| ADS7822U | 12-bit, 200 kSPS, 8-pin SOIC; higher power (1.25 mW @ 200 kSPS), no internal reference (requires external VREF) | Limited to lower-speed, space-tolerant designs; lacks SOT-23 footprint and VDD-referenced simplicity | Choose ADS7822U only if legacy board layout or external reference control is required; AD7476SRTZ-R2 offers superior speed, integration, and size |
Compared with AD7476ARTZ-REEL7, AD7476SRTZ-R2 provides identical performance in cut-tape form for flexible procurement, while ADS7822U trades speed, size, and reference integration for legacy compatibility - making AD7476SRTZ-R2 optimal for new compact, battery-aware designs demanding 1 MSPS.
Availability
AD7476SRTZ-R2 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and industrial sensor transmitters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AD7476SRTZ-R2 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 AD7476SRTZ-R2 belongs to Analog Devices' micropower SAR ADC product line, engineered for ultra-low-power, high-speed data acquisition in space- and energy-constrained applications such as portable instrumentation and sensor nodes.
FAQ
What is the maximum sampling rate supported by the AD7476SRTZ-R2?
The AD7476SRTZ-R2 supports a maximum throughput rate of 1 MSPS when operated with a 20 MHz SCLK and VDD ≥ 2.7 V. At lower supply voltages (2.35 V to 2.7 V), the maximum SCLK is 12 MHz, limiting throughput to 600 kSPS. This behavior is defined in the A- and B-version specifications, and AD7476SRTZ-R2 corresponds to the A version per Analog Devices' ordering guide.
Does the AD7476SRTZ-R2 require an external voltage reference?
No, the AD7476SRTZ-R2 uses an internal reference derived from VDD, enabling a full-scale input range of 0 V to VDD. This eliminates the need for external reference components, simplifies PCB layout, and reduces system cost - a key advantage over alternatives like the ADS7822U that require precision external VREF.
What is the serial data format output by the AD7476SRTZ-R2?
The AD7476SRTZ-R2 outputs a 16-bit serial frame on SDATA, MSB first: four leading zeros followed by the 12-bit conversion result. There are no trailing zeros. This format is distinct from the AD7477 (10-bit + two trailing zeros) and AD7478 (8-bit + four trailing zeros), ensuring unambiguous firmware parsing for the AD7476SRTZ-R2.
How does the AD7476SRTZ-R2 manage power in low-duty-cycle applications?
The AD7476SRTZ-R2 features a full power-down mode drawing ≤1 μA when SCLK is inactive, activated automatically when CS remains high between conversions. Combined with its 3.6 mW active power at 3 V, this enables average power scaling proportional to actual sampling duty cycle - ideal for wake-on-event sensor nodes where AD7476SRTZ-R2 spends >99% of time in standby.
Is the AD7476SRTZ-R2 pin-compatible with other members of the AD7476/AD7477/AD7478 family?
Yes, all three devices share identical 6-lead SOT-23 pinouts and logic-level timing, allowing direct substitution in hardware. However, firmware must be updated to handle differing data frame lengths (12-bit vs. 10-bit vs. 8-bit) and associated performance trade-offs - e.g., AD7476SRTZ-R2 delivers 70 dB SNR versus 61 dB for AD7477 and 49 dB for AD7478 at 1 MSPS.
AD7476SRTZ-R2 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-R2 FAQ
1.How can I place an order for AD7476SRTZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7476SRTZ-R2 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-R2 reliable?
The price and inventory of AD7476SRTZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7476SRTZ-R2 is usually 5 days.
3.What payment methods are accepted for AD7476SRTZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7476SRTZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7476SRTZ-R2?
AD7476SRTZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7476SRTZ-R2 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-R2?
For technical support, including AD7476SRTZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7476SRTZ-R2 requirements.
6.How does Aetrix verify that AD7476SRTZ-R2 is sourced from the original manufacturer or authorized distributors?
All AD7476SRTZ-R2 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-R2 meets industry standards.
7.What is the process for return or replacement of AD7476SRTZ-R2?
All AD7476SRTZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7476SRTZ-R2, 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-R2 part is unused and in its original packaging.
Return procedure for AD7476SRTZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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