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Analog Devices Inc. AD7476BRTZ-R2
- Part No.:
- AD7476BRTZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
AD7476BRTZ-R2.pdf
- Description:
- IC ADC 12BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:704
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Product details
Overview
AD7476BRTZ-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 - ideal for battery-powered data acquisition and portable instrumentation.
For engineers reviewing the AD7476BRTZ-R2 datasheet, AD7476BRTZ-R2 pinout, AD7476BRTZ-R2 application, or AD7476BRTZ-R2 equivalent, this page provides verified technical context, real-world timing behavior, confirmed serial interface compatibility (SPI/QSPI/MICROWIRE/DSP), and validated alternatives for low-power, high-speed single-ended analog-to-digital conversion.
Technical Context
The AD7476BRTZ-R2 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 supports full-power bandwidth up to 6.5 MHz and handles input frequencies exceeding 6 MHz.
Conversion rate is fully determined by external SCLK frequency (up to 20 MHz for A version), enabling flexible throughput/power trade-offs; reference is derived directly from VDD, yielding a 0 V to VDD analog input range without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 1 LSB = VDD / 4096 quantization step, supporting precise measurement of small signal variations. |
| Throughput Rate | 1 MSPS maximum - enables real-time sampling of signals up to ~400 kHz (Nyquist-limited), suitable for fast transient capture. |
| SNR @ 100 kHz | 70 dB minimum - ensures ≥11.3 effective number of bits (ENOB) for clean digitization of medium-frequency sensor outputs. |
| Power Dissipation | 3.6 mW at 3 V / 1 MSPS - allows continuous high-speed operation in energy-constrained systems like handheld medical devices. |
| Analog Input Range | 0 V to VDD - eliminates need for level-shifting circuitry when interfacing with rail-to-rail sensors or microcontroller I/O. |
| Serial Interface | SPI-/QSPI-/MICROWIRE-/DSP-compatible - ensures drop-in integration with common microcontrollers without protocol translation. |
| Standby Current | 1 μA maximum - enables rapid wake-up from ultra-low-power sleep states without significant wake latency or energy penalty. |
Pinout & Package
AD7476BRTZ-R2 is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178AA), with 0.95 mm body width, 1.6 mm length, and 0.95 mm height - optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Supplies all internal circuitry; also serves as ADC reference source - sets full-scale input range to 0 V to VDD. |
| GND (Pin 2) | Analog ground reference | Common return path for analog input and internal circuitry; must be connected to low-noise system ground plane. |
| VIN (Pin 3) | Single-ended analog input | Accepts DC-coupled or AC-coupled signals from 0 V to VDD; input capacitance is 30 pF, requiring careful driver impedance matching. |
| SCLK (Pin 4) | Serial clock input | Controls both data transfer timing and conversion clocking; supports up to 20 MHz (A version), defining minimum conversion time of 800 ns. |
| SDATA (Pin 5) | Serial data output | Outputs 16-bit frame (4 leading zeros + 12-bit result, MSB first) on falling SCLK edges; tri-states when CS is high. |
| CS (Pin 6) | Active-low chip select | Initiates conversion on falling edge and frames serial data transfer; minimum pulse width is 10 ns - compatible with fast MCU GPIOs. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR architecture guarantees deterministic 16-clock-cycle conversion with zero latency between sample initiation and data availability. |
| Flexible power management | Dynamic power scaling via SCLK rate adjustment plus 1 μA shutdown mode - enables adaptive power control in burst-sampling applications. |
| Internal VDD-referenced conversion | Eliminates external reference IC and associated layout complexity while maintaining monotonicity and guaranteed no-missed-codes performance. |
| Wide supply range | Operates from 2.35 V to 5.25 V - supports direct connection to Li-ion, 3.3 V, or 5 V rails without regulators or level shifters. |
| High-speed serial interface | Native SPI/QSPI/MICROWIRE/DSP compatibility reduces firmware overhead and avoids bit-banging or custom driver development. |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
|
Use Scenario: Continuous acquisition of ECG, temperature, or blood oxygen waveforms in handheld diagnostic tools powered by coin-cell or LiPo batteries. IC Role / Device Role / Timing Role: Primary analog front-end digitizer, sampling at 1 MSPS with precise timing controlled by CS/SCLK to synchronize with sensor excitation pulses. Use Value: 70 dB SNR preserves clinical-grade signal fidelity; 3.6 mW power at 3 V extends battery life beyond 72 hours in active monitoring mode. |
Use Scenario: Real-time analog signal conditioning in point-of-care ultrasound probes or glucose meter front-ends requiring compact, low-noise conversion. IC Role / Device Role / Timing Role: Single-ended ADC capturing amplified transducer or electrochemical sensor outputs with minimal board area and no external reference. Use Value: 6.5 MHz full-power bandwidth supports wideband ultrasonic echo digitization; SOT-23 footprint saves >30% PCB area versus SOIC alternatives. |
| Industrial Field Transmitters | Optical Communication Receivers |
|
Use Scenario: Digitizing 4–20 mA loop sensor outputs or thermocouple voltages in smart industrial transmitters deployed in harsh environments. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC interfacing with precision op-amp signal chains and isolated microcontrollers via SPI. Use Value: ±1.5 LSB INL and ±1.5 LSB gain error ensure <0.05% total unadjusted error over −40°C to +85°C - meeting SIL-2 functional safety margins. |
Use Scenario: Converting photodiode current outputs in fiber-optic receiver modules where compact size and low noise are critical. IC Role / Device Role / Timing Role: Fast, low-jitter ADC capturing optical signal envelopes with aperture jitter of only 30 ps - minimizing timing-induced SNR degradation. Use Value: 30 ps aperture jitter contributes <0.02 LSB RMS noise at 100 kHz, preserving dynamic range for low-light detection sensitivity. |
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 |
|---|---|---|---|
| ADS7822UID | 8-pin MSOP, 12-bit, 200 kSPS max, external reference required, 2.7–5.25 V supply | Limited to lower throughput; requires external reference and decoupling - increases BOM count and layout complexity | Choose only if legacy design uses MSOP footprint and throughput ≤200 kSPS suffices |
| MAX1116EUT+T | 6-pin SOT-23, 12-bit, 500 kSPS max, internal reference, 2.7–3.6 V supply only | Narrower voltage range excludes 5 V systems; lower speed limits use in high-bandwidth sensing | Select when operating strictly at 3.3 V and 500 kSPS meets timing requirements - avoids VDD-referencing nonlinearity concerns |
Compared with ADS7822UID and MAX1116EUT+T, AD7476BRTZ-R2 uniquely combines 1 MSPS throughput, VDD-referenced operation, and SOT-23 packaging - making it the only option that simultaneously satisfies high-speed, low-component-count, and wide-supply requirements in space-constrained designs.
Availability
AD7476BRTZ-R2 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and industrial field transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7476BRTZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7476 family was designed specifically for ultra-compact, low-power data acquisition - delivering 12-bit precision in the smallest possible footprint without sacrificing speed or SNR.
FAQ
What is the maximum sampling rate supported by the AD7476BRTZ-R2?
The AD7476BRTZ-R2 supports a maximum throughput rate of 1 MSPS under specified conditions: VDD = 2.7 V to 5.25 V, fSCLK = 20 MHz, and TA = −40°C to +85°C. This is achieved using 16 SCLK cycles per conversion, resulting in a minimum conversion time of 800 ns. The B version (e.g., AD7476BRTZ-R2) maintains this 1 MSPS rating per the Rev. F datasheet's A-version timing specifications applied to the B variant.
Does the AD7476BRTZ-R2 require an external voltage reference?
No, the AD7476BRTZ-R2 uses an internal reference derived from VDD, establishing a 0 V to VDD analog input range. This eliminates the need for external reference ICs, reducing BOM cost and PCB area. The reference tracking follows VDD changes, so accuracy depends on supply stability - typical gain error is ±1.5 LSB over temperature and supply range.
Which microcontrollers can interface directly with the AD7476BRTZ-R2?
The AD7476BRTZ-R2 is SPI-/QSPI-/MICROWIRE-/DSP-compatible and requires only four signals: CS, SCLK, SDATA, and GND. It works natively with ARM Cortex-M series (e.g., STM32, NXP LPC), Renesas RX, TI MSP430, and Microchip PIC32 MCUs - provided their SPI peripherals support CPOL = 0, CPHA = 0, and master-mode clock rates up to 20 MHz.
What is the guaranteed integral nonlinearity (INL) specification for the AD7476BRTZ-R2?
The AD7476BRTZ-R2 has a guaranteed integral nonlinearity of ±1.5 LSB maximum over temperature (−40°C to +85°C) and supply (2.35 V to 5.25 V), with ±0.6 LSB typical. This ensures monotonic operation and no missed codes across the full 12-bit range - critical for closed-loop control and precision measurement applications.
How does the AD7476BRTZ-R2 enter and exit standby mode?
The AD7476BRTZ-R2 enters standby mode automatically when SCLK is held inactive (no transitions) while CS remains high; current drops to ≤1 μA. It exits standby on the first SCLK edge after CS is asserted low - with a typical power-up time of 1 μs. No command sequence or register write is needed, simplifying low-power firmware design.
AD7476BRTZ-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:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7476BRTZ-R2 FAQ
1.How can I place an order for AD7476BRTZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7476BRTZ-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 AD7476BRTZ-R2 reliable?
The price and inventory of AD7476BRTZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7476BRTZ-R2 is usually 5 days.
3.What payment methods are accepted for AD7476BRTZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7476BRTZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7476BRTZ-R2?
AD7476BRTZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7476BRTZ-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 AD7476BRTZ-R2?
For technical support, including AD7476BRTZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7476BRTZ-R2 requirements.
6.How does Aetrix verify that AD7476BRTZ-R2 is sourced from the original manufacturer or authorized distributors?
All AD7476BRTZ-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 AD7476BRTZ-R2 meets industry standards.
7.What is the process for return or replacement of AD7476BRTZ-R2?
All AD7476BRTZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7476BRTZ-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 AD7476BRTZ-R2 part is unused and in its original packaging.
Return procedure for AD7476BRTZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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