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Analog Devices Inc. AD7475BR-REEL7
- Part No.:
- AD7475BR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7475BR-REEL7.pdf
- Description:
- IC ADC 12BIT SRL LP 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:325
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Product details
Overview
AD7475BR-REEL7 from Analog Devices is a 12-bit, single-supply successive-approximation ADC with 1 MSPS throughput, 68 dB SINAD at 300 kHz input, ±1 LSB max integral nonlinearity (B grade), and operation from 2.7 V to 5.25 V. It features an external 2.5 V reference input (REF IN), VDRIVE for independent logic-level interfacing, and is used in portable medical instruments requiring high-speed, low-power signal digitization.
For engineers reviewing the AD7475BR-REEL7 datasheet, AD7475BR-REEL7 pinout, AD7475BR-REEL7 application, or AD7475BR-REEL7 equivalent, this page delivers verified specifications, package mapping to 8-lead MSOP, functional pin roles, real-world use cases in battery-powered systems, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The AD7475BR-REEL7 implements a capacitive DAC-based successive-approximation architecture with no pipeline delay, sampling triggered on the falling edge of CS and conversion fully controlled by SCLK timing. Its track-and-hold supports full-power bandwidth up to 8.3 MHz (–3 dB) and acquires signals in ≤325 ns after a full-scale step.
It uses a single 2.7 V–5.25 V supply (VDD) while supporting independent logic interface voltage via VDRIVE (2.7 V–5.25 V), enabling direct connection to 3 V or 5 V microprocessors without level shifters. Reference is externally applied to REF IN (2.5 V ±1%), and the device enters full power-down mode drawing ≤1 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes for precise analog signal quantization |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to 500 kHz Nyquist bandwidth |
| SINAD | 68 dB min at 300 kHz - ensures ≥11.0 effective bits for medium-frequency sensor signals |
| Integral Nonlinearity | ±1 LSB max (B grade) - guarantees monotonicity and no missing codes across full scale |
| Power Dissipation | 4.5 mW max at 3 V / 1 MSPS - enables >220 kSPS per mW efficiency in portable designs |
| Aperture Jitter | 50 ps typ - limits sampling uncertainty to <0.1 LSB at 100 kHz input |
| Reference Input | 2.5 V ±1% - requires stable external reference; no internal reference present |
Pinout & Package
AD7475BR-REEL7 is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), RoHS-compliant and moisture-sensitive level 1. Pin 1 is marked with a dot; pin numbering follows standard counter-clockwise orientation from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Reference Input | Accepts external 2.5 V ±1% reference; requires ≥0.1 µF decoupling capacitor to GND |
| 2 - VIN | Analog Input | Single-ended input with 0 V to REF IN range; 20 pF input capacitance affects anti-alias filter design |
| 3 - GND | Analog Ground | Primary ground reference for analog circuitry; must be connected to clean analog plane |
| 4 - SCLK | Serial Clock Input | Drives both data transfer and internal conversion timing; supports up to 20 MHz clock rate |
| 5 - SDATA | Serial Data Output | 3-state output delivering 4 leading zeros + 12-bit MSB-first result on SCLK falling edge |
| 6 - VDRIVE | Logic Supply | Sets I/O voltage level independently of VDD; allows 3 V MCU interface even with 5 V VDD |
| 7 - CS | Chip Select | Active-low signal initiating sample acquisition on falling edge and framing serial data window |
| 8 - VDD | Analog/Digital Power | Single 2.7 V–5.25 V supply powering core ADC, T/H, and digital logic; 450 mW max dissipation |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True successive-approximation behavior enables deterministic, single-shot conversion control via CS timing |
| VDRIVE logic independence | Allows direct SPI interface to 3 V or 5 V processors without level-shifting circuitry or timing penalties |
| Low power at full speed | Consumes only 1.5 mA at 3 V / 1 MSPS - ideal for duty-cycled battery-powered data loggers |
| Wide input bandwidth | 8.3 MHz full-power bandwidth (–3 dB) supports accurate digitization of fast transients and RF envelope signals |
| Three power modes | Full shutdown (1 µA), partial power-down (100 µA), and normal operation enable dynamic power scaling per sample rate |
Applications
| Portable ECG Monitors | Handheld Test Meters |
|---|---|
Use Scenario: Digitizing low-amplitude, high-impedance biopotential signals (e.g., 0.5–5 mV ECG leads) in compact, battery-operated clinical devices. IC Role / Device Role / Timing Role: Primary analog front-end ADC acquiring 12-bit samples at 1–2 kSPS during patient monitoring, with burst-mode 1 MSPS capability for arrhythmia detection. Use Value: 68 dB SINAD ensures diagnostic-grade fidelity; 4.5 mW power at 3 V extends battery life beyond 72 hours on two AA cells. |
Use Scenario: Capturing transient voltage/current waveforms in handheld multimeters and clamp meters with autoranging and true-RMS calculation. IC Role / Device Role / Timing Role: High-speed sampling engine feeding DSP algorithms for real-time RMS, crest factor, and harmonic analysis. Use Value: 1 MSPS throughput enables 500 kHz Nyquist bandwidth for accurate switching power supply ripple measurement; VDRIVE simplifies integration with 3.3 V ARM Cortex-M host. |
| Wireless Sensor Nodes | Industrial PLC Analog Inputs |
Use Scenario: Battery-powered IoT nodes measuring temperature, pressure, or vibration using MEMS sensors with millivolt-level outputs. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated by wake-up timer or external interrupt, converting sensor output before entering 1 µA shutdown. Use Value: Full power-down current ≤1 µA minimizes quiescent drain; external 2.5 V reference ensures stable scaling across temperature (-40°C to +85°C). |
Use Scenario: Modular analog input modules in programmable logic controllers digitizing 4–20 mA loop signals or ±10 V industrial sensors. IC Role / Device Role / Timing Role: Precision ADC in isolated signal conditioning stage, interfacing via optocoupled SPI to main controller. Use Value: ±1 LSB INL (B grade) meets Class A accuracy requirements for 12-bit industrial I/O; SOIC/MSOP package supports automated PCB assembly. |
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 |
|---|---|---|---|
| AD7476BRMZ-REEL | Same 12-bit SAR architecture, but 1.25 MSPS max throughput and 3.5 mW @ 3 V / 1 MSPS; pin-compatible 8-lead MSOP footprint. | Higher speed and lower power suit higher-sample-rate sensor fusion; lacks VDRIVE pin - logic interface tied to VDD. | Select AD7476BRMZ-REEL when system requires marginally faster sampling and can accept fixed I/O voltage matching VDD. |
| ADS7822U | 12-bit SAR ADC with integrated 2.5 V reference and 200 kSPS max throughput; 8-lead SOIC package; consumes 2.5 mW @ 3 V. | Lower speed and built-in reference simplify BOM for cost-sensitive metering; not suitable for >200 kSPS applications. | Choose ADS7822U where board space permits SOIC and design prioritizes reference integration over speed. |
Compared with AD7475BR-REEL7, AD7476BRMZ-REEL offers higher throughput and lower power but forfeits VDRIVE flexibility, while ADS7822U trades speed for integrated reference and simpler layout - making AD7475BR-REEL7 optimal for 1 MSPS, multi-voltage embedded systems needing external reference control.
Availability
AD7475BR-REEL7 is available at Aetrix Electronics and suitable for portable medical instruments, handheld test equipment, wireless sensor nodes, and industrial PLC analog input modules requiring stable component supply with guaranteed long-term availability.
Supply support for AD7475BR-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD7475BR-REEL7 belongs to Analog Devices' precision SAR ADC product line, engineered for battery-powered and space-constrained applications demanding high speed, low power, and flexible logic interfacing without sacrificing DC accuracy.
FAQ
What is the reference configuration for AD7475BR-REEL7?
The AD7475BR-REEL7 requires an external 2.5 V ±1% reference applied to the REF IN pin. It does not include an internal reference. A minimum 0.1 µF ceramic capacitor must be placed between REF IN and GND for stability. This differs from the AD7495, which provides an on-chip 2.5 V reference at REF OUT. The AD7475BR-REEL7's external reference architecture allows users to select higher-precision or temperature-stable references when needed.
Does AD7475BR-REEL7 support SPI-compatible serial interfaces?
Yes, AD7475BR-REEL7 features an SPI-/QSPI™-/MICROWIRE-/DSP-compatible serial interface. It uses CS (active-low chip select), SCLK, and SDATA pins. Conversion data is output MSB-first as four leading zeros followed by 12 data bits, synchronized to the falling edge of SCLK. No additional framing or protocol overhead is required, and it operates with standard 3-wire SPI master configurations.
What power modes does AD7475BR-REEL7 offer and how are they controlled?
AD7475BR-REEL7 supports three power modes: Normal (1.5–2.1 mA), Partial Power-Down (100 µA static), and Full Power-Down (≤1 µA). Mode selection is controlled entirely through the serial interface using specific CS/SCLK sequences defined in the datasheet's Operating Modes section - no dedicated control pins are required. Recovery time from full shutdown is 20 µs.
Is AD7475BR-REEL7 pin-compatible with AD7495?
No, AD7475BR-REEL7 is not pin-compatible with AD7495. Although both use 8-lead MSOP/SOIC packages and share identical pin count and physical layout, Pin 1 is REF IN on AD7475BR-REEL7 but REF OUT on AD7495. Swapping them without PCB modification will cause incorrect reference connection and functional failure. They are functionally related but electrically distinct variants.
What is the maximum recommended SCLK frequency for AD7475BR-REEL7?
The maximum rated SCLK frequency for AD7475BR-REEL7 is 20 MHz, which enables the full 1 MSPS throughput rate (16 SCLK cycles per conversion). At 20 MHz, conversion time is 800 ns max. Lower SCLK frequencies (e.g., 5 MHz) reduce throughput proportionally but maintain full DC and AC performance - allowing trade-offs between speed and EMI or power consumption in noise-sensitive designs.
AD7475BR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7475BR-REEL7 FAQ
1.How can I place an order for AD7475BR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7475BR-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 AD7475BR-REEL7 reliable?
The price and inventory of AD7475BR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7475BR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7475BR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7475BR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7475BR-REEL7?
AD7475BR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7475BR-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 AD7475BR-REEL7?
For technical support, including AD7475BR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7475BR-REEL7 requirements.
6.How does Aetrix verify that AD7475BR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7475BR-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 AD7475BR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7475BR-REEL7?
All AD7475BR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7475BR-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 AD7475BR-REEL7 part is unused and in its original packaging.
Return procedure for AD7475BR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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