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Analog Devices Inc. AD7476SRT-REEL7
- Part No.:
- AD7476SRT-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
AD7476SRT-REEL7.pdf
- Description:
- IC ADC 12BIT 1MSPS SOT-23-6 TR
- Quantity:
- Payment:
- Shipping:
Inventory:4,737
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Product details
Overview
AD7476SRT-REEL7 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 features no pipeline delay, SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface, and internal VDD-referenced conversion for 0 V to VDD analog input range - ideal for space-constrained, battery-powered data acquisition.
For engineers reviewing the AD7476SRT-REEL7 datasheet, AD7476SRT-REEL7 pinout, AD7476SRT-REEL7 application, or AD7476SRT-REEL7 equivalent, key selection criteria include its 12-bit resolution with ±1.5 LSB INL, 1 MSPS throughput at 20 MHz SCLK, 6.5 MHz full-power bandwidth, low 1 μA standby current, and verified compatibility with microprocessor/DSP serial interfaces requiring minimal board area.
Technical Context
The AD7476SRT-REEL7 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 derived directly from VDD, eliminating external reference components while enabling rail-to-rail input range.
Timing is fully controlled by CS and SCLK: conversion initiates at CS fall, data is clocked out MSB-first on SCLK falling edges, and SDATA enters high-impedance state within 20 ns after SCLK fall (A version). The device supports flexible power management via shutdown mode (1 μA max) and dynamic clock-speed scaling to reduce average power during idle periods.
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 portable instrumentation. |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to 500 kHz Nyquist bandwidth without aliasing in high-speed modem or sensor readout. |
| SNR @ 100 kHz | 70 dB min - ensures ≥11.3 effective number of bits (ENOB) for clean digitization of medium-frequency sensor outputs. |
| Supply Range | 2.35 V to 5.25 V - enables direct interfacing with Li-ion (3.0–4.2 V), 3.3 V logic, and 5 V legacy systems without level-shifting. |
| Power @ 1 MSPS | 3.6 mW at 3 V - allows continuous high-speed acquisition in PDA or medical handhelds with multi-day battery life. |
| INL / DNL | ±1.5 LSB max / −0.9/+1.5 LSB max - guarantees monotonicity and no missing codes across full temperature range (−40°C to +85°C). |
| Aperture Jitter | 30 ps typ - limits sampling uncertainty to <0.05% of 1 MSPS period, preserving dynamic performance at high input frequencies. |
Pinout & Package
AD7476SRT-REEL7 is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178AA), footprint compatible with standard SOT-23 pick-and-place equipment and offering thermal impedance 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 logic, and serves as internal reference - eliminates need for external voltage reference. |
| GND (Pin 2) | Analog ground reference | Common return path for analog circuitry; must be connected to low-impedance system ground to maintain 70 dB SNR performance. |
| VIN (Pin 3) | Analog input channel | Single-ended input with 0 V to VDD range and 30 pF input capacitance - requires external RC anti-alias filter matched to 6.5 MHz full-power bandwidth. |
| SCLK (Pin 4) | Serial clock input | Controls conversion timing and data transfer; accepts 10 kHz–20 MHz CMOS-level clock - higher frequency reduces conversion time to 0.8 μs. |
| SDATA (Pin 5) | Serial data output | Three-state CMOS output delivering 12-bit result MSB-first, prefixed by four zeros - compatible with SPI Mode 0/3 and requires no external pull-up. |
| CS (Pin 6) | Chip select / conversion trigger | Active-low signal that initiates sampling on falling edge and frames 16-bit serial frame - enables deterministic, microprocessor-synchronized acquisition. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR architecture provides immediate, deterministic latency: conversion completes in fixed 16 SCLK cycles with no hidden cycles or buffer dependencies. |
| VDD-referenced conversion | Internal reference tied to VDD enables full-scale input range of 0 V to VDD - simplifies design by removing external reference IC and associated layout sensitivity. |
| Ultra-low standby current | 1 μA maximum shutdown current extends battery life in intermittent-sampling applications like wireless sensor nodes or portable diagnostics. |
| Wide supply voltage range | Operates down to 2.35 V - supports brown-out resilience in Li-ion systems and compatibility with 2.5 V/3.3 V/5 V host platforms without regulators. |
| SPI/QSPI/MICROWIRE compatibility | Standard serial interface with MSB-first, 16-bit frame (4 leading zeros + 12 data bits) ensures plug-and-play integration with ARM Cortex-M, TI C2000, and ADI SHARC DSPs. |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
|
Use Scenario: Continuous 1 MSPS sampling of ECG or pulse oximetry analog front-end outputs in handheld diagnostic devices powered by coin-cell or Li-po batteries. IC Role / Device Role / Timing Role: Primary SAR ADC acquiring single-ended biopotential signals with rail-to-rail input range and minimal power overhead. Use Value: 3.6 mW consumption at 3 V enables >72 hours of continuous logging on a 200 mAh battery, while 70 dB SNR preserves clinical-grade waveform fidelity. |
Use Scenario: High-fidelity digitization of amplified photodiode or thermistor outputs in point-of-care blood analyzers or glucose meters. IC Role / Device Role / Timing Role: Precision analog-to-digital converter interfacing directly to op-amp output, synchronized to microcontroller via CS/SCLK. Use Value: ±1.5 LSB INL and no missing codes ensure accurate calibration traceability across temperature, critical for FDA-regulated medical accuracy requirements. |
| Industrial IoT Edge Nodes | Optical Communication Receivers |
|
Use Scenario: Monitoring vibration, temperature, or pressure in predictive maintenance gateways deployed in harsh factory environments. IC Role / Device Role / Timing Role: Low-power, wide-temperature ADC converting conditioned sensor outputs under microcontroller control with deterministic timing. Use Value: Guaranteed operation from −40°C to +85°C and 1 μA shutdown current allow unattended multi-year deployment in temperature-variable enclosures. |
Use Scenario: Digitizing fast transient photocurrent pulses from avalanche photodiodes (APDs) in fiber-optic transceivers or LIDAR front-ends. IC Role / Device Role / Timing Role: High-speed sampling ADC capturing narrow optical pulses with 6.5 MHz full-power bandwidth and 30 ps aperture jitter. Use Value: 1 MSPS throughput and 100 kHz–70 dB SNR performance enable accurate pulse amplitude and timing extraction for high-data-rate optical links. |
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, 200 kSPS, 3 V only, SPI-compatible but no VDD reference - requires external 2.5 V reference. | Lower resolution and speed; suited for cost-sensitive, low-bandwidth sensor monitoring where 12-bit precision is unnecessary. | Select ADS7822U only when 8-bit resolution suffices and board space allows separate reference routing. |
| MAX1116EUA+ | 12-bit, 500 kSPS, 2.7–3.6 V supply, internal reference, but 8-lead µMAX package - larger footprint and lower throughput than AD7476SRT-REEL7. | Acceptable for space-tolerant industrial controls needing same resolution but not 1 MSPS rate. | Choose MAX1116EUA+ if SOT-23 size is not mandatory and 500 kSPS meets system timing budget. |
Compared with ADS7822U and MAX1116EUA+, AD7476SRT-REEL7 uniquely combines 12-bit resolution, 1 MSPS throughput, VDD-referenced operation, and 6-lead SOT-23 packaging - making it the only option satisfying simultaneous requirements for high speed, precision, ultra-small size, and simplified power/reference design.
Availability
AD7476SRT-REEL7 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, industrial IoT edge nodes, and optical sensor interfaces requiring stable component supply, long-term manufacturability, and guaranteed Pb-free compliance.
Supply support for AD7476SRT-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 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 AD7476SRT-REEL7 belongs to Analog Devices' micropower SAR ADC product line, engineered specifically for space- and energy-constrained applications demanding high resolution without sacrificing speed or simplicity.
FAQ
What is the maximum sampling rate supported by the AD7476SRT-REEL7?
The AD7476SRT-REEL7 supports a maximum throughput rate of 1 MSPS when operated with a 20 MHz serial clock and VDD between 2.7 V and 5.25 V. At lower supply voltages (2.35–3.6 V), the maximum rate is 600 kSPS per the B/S version specifications. Conversion time is fixed at 16 SCLK cycles, so actual rate scales linearly with clock frequency - e.g., 10 MHz SCLK yields 625 kSPS.
Does the AD7476SRT-REEL7 require an external voltage reference?
No, the AD7476SRT-REEL7 uses an internal reference derived from VDD, enabling a full-scale analog input range of 0 V to VDD. This eliminates the need for external reference components, reduces BOM count, and avoids reference-related errors such as drift or noise coupling - a key advantage over many competing 12-bit ADCs.
What are the absolute maximum ratings for the AD7476SRT-REEL7 supply voltage?
The absolute maximum rating for VDD to GND is −0.3 V to +7 V. However, functional operation is specified only from 2.35 V to 5.25 V. Exceeding 5.25 V may cause permanent damage, and operation below 2.35 V is not guaranteed - though the device can remain powered down at as low as 2.0 V per datasheet footnote.
How does the AD7476SRT-REEL7 handle power-down mode, and what is its current draw?
The AD7476SRT-REEL7 enters full power-down mode when SCLK is held inactive and CS remains high, drawing ≤1 μA at any VDD within specification. In this state, the internal reference and track-and-hold are disabled, and SDATA enters high-impedance. Wake-up time is 1 μs typical, allowing rapid resumption of sampling without recalibration.
Is the AD7476SRT-REEL7 pin-compatible with other members of the AD7476/AD7477/AD7478 family?
Yes, all variants - including AD7476 (12-bit), AD7477 (10-bit), and AD7478 (8-bit) - share identical 6-lead SOT-23 pinout, electrical interface, and timing behavior. This allows hardware reuse across resolution tiers; only firmware must be updated to interpret the differing data word lengths (12, 10, or 8 bits plus leading/trailing zeros).
AD7476SRT-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- SPI, DSP
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- SOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7476SRT-REEL7 FAQ
1.How can I place an order for AD7476SRT-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7476SRT-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 AD7476SRT-REEL7 reliable?
The price and inventory of AD7476SRT-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7476SRT-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7476SRT-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7476SRT-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7476SRT-REEL7?
AD7476SRT-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7476SRT-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 AD7476SRT-REEL7?
For technical support, including AD7476SRT-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7476SRT-REEL7 requirements.
6.How does Aetrix verify that AD7476SRT-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7476SRT-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 AD7476SRT-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7476SRT-REEL7?
All AD7476SRT-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7476SRT-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 AD7476SRT-REEL7 part is unused and in its original packaging.
Return procedure for AD7476SRT-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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