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Analog Devices Inc. AD7475AR-REEL7
- Part No.:
- AD7475AR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7475AR-REEL7.pdf
- Description:
- IC ADC 12BIT SRL LP 8-SOIC T/R
- Quantity:
- Payment:
- Shipping:
Inventory:8,500
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Product details
Overview
AD7475AR-REEL7 from Analog Devices is a 12-bit, single-supply successive-approximation ADC with 1 MSPS throughput, 68 dB SINAD at 300 kHz input, ±1.5 LSB INL (A-grade), and operation from 2.7 V to 5.25 V. It features an external 2.5 V reference input (REF IN), no pipeline delay, and SPI-/QSPI-/MICROWIRE-compatible serial interface - used in portable medical instruments for high-fidelity analog sensor digitization.
For engineers reviewing the AD7475AR-REEL7 datasheet, AD7475AR-REEL7 pinout, AD7475AR-REEL7 application, or AD7475AR-REEL7 equivalent, key selection criteria include its 1 µA full shutdown current, VDRIVE-independent 3 V/5 V logic interfacing, 300 ns track-and-hold acquisition time, and guaranteed no-missed-codes performance across −40°C to +85°C.
Technical Context
The AD7475AR-REEL7 implements a capacitive DAC-based successive-approximation architecture with precise sampling controlled by the CS falling edge and conversion clocked by SCLK. Its track-and-hold amplifier supports full-power bandwidth up to 8.3 MHz (−3 dB) and handles input frequencies >1 MHz without aliasing degradation.
It operates in three power modes: normal (1.5 mA @ 3 V / 1 MSPS), partial power-down (450 µA @ 100 kSPS), and full power-down (1 µA). The VDRIVE pin decouples logic I/O voltage (2.7 V–5.25 V) from VDD, enabling direct interfacing with 3 V microcontrollers even when VDD = 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precision sensor digitization |
| Throughput Rate | 1 MSPS - supports real-time sampling of fast transients in portable diagnostics |
| SINAD | 68 dB min @ 300 kHz - ensures ≥11.3 effective bits for clean signal capture in noisy environments |
| INL | ±1.5 LSB max (A-grade) - guarantees monotonicity and linearity critical for closed-loop control |
| Power Dissipation | 4.5 mW max @ 3 V / 1 MSPS - enables battery operation >10 hours in PDA-class devices |
| Shutdown Current | 1 µA max - minimizes quiescent drain during idle intervals in intermittent-sampling systems |
| Reference Input | 2.5 V ±1% REF IN - requires external stable reference; no internal reference circuitry |
Pinout & Package
AD7475AR-REEL7 is housed in an 8-lead MSOP package (3.0 mm × 4.9 mm, 0.65 mm pitch), RoHS-compliant and tape-and-reel packaged per REEL7 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Reference Input | Accepts external 2.5 V ±1% reference; requires ≥0.1 µF decoupling capacitor for stability |
| 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 tied to system AGND plane, not DGND |
| 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 12-bit result MSB-first with four leading zeros; timing-critical for FPGA/DSP sync |
| 6 - VDRIVE | Logic Supply | Sets I/O voltage level independently of VDD; allows 3 V MCU interface while VDD = 5 V |
| 7 - CS | Chip Select | Active-low signal initiating sample acquisition on falling edge; frames 16-bit serial readout |
| 8 - VDD | Analog Power Supply | 2.7 V–5.25 V single supply powering core ADC and T/H; bypass with 1 µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True successive-approximation behavior with deterministic 800 ns conversion time - eliminates latency uncertainty in time-critical control loops |
| VDRIVE logic independence | Enables mixed-voltage system integration: 3 V processor communicates directly with AD7475AR-REEL7 while VDD = 5 V, avoiding level shifters |
| Guaranteed no-missed-codes | DNL ≤ +1.5/−0.9 LSB ensures monotonic response across full 12-bit range - essential for position/speed feedback applications |
| Flexible power management | Three operational modes (normal/partial/full power-down) allow dynamic current scaling from 1.5 mA to 1 µA based on sampling duty cycle |
| High-speed serial interface | SPI-/QSPI-/MICROWIRE-/DSP-compatible protocol with 20 MHz SCLK support - simplifies firmware integration on legacy and modern controllers |
Applications
| Portable Medical Instrumentation | Industrial Sensor Interface |
|---|---|
Use Scenario: Digitizing ECG/EEG analog front-end outputs in handheld diagnostic devices with strict battery life targets. IC Role / Device Role / Timing Role: Primary 12-bit ADC acquiring biopotential signals at 1 MSPS with low noise floor and minimal power draw. Use Value: 68 dB SINAD preserves diagnostic fidelity; 4.5 mW @ 3 V extends battery runtime beyond 12 hours per charge. |
Use Scenario: Converting outputs from strain gauges and RTDs in modular PLC I/O modules operating in harsh industrial environments. IC Role / Device Role / Timing Role: High-accuracy, single-supply ADC interfacing with isolated analog conditioning stages and 3 V microcontrollers. Use Value: ±1.5 LSB INL ensures measurement repeatability; VDRIVE separation avoids logic-level conflicts in mixed-voltage backplanes. |
| Optical Sensor Signal Chain | Mobile Communication Test Equipment |
Use Scenario: Sampling photodiode current outputs in optical power meters and fiber optic monitoring units. IC Role / Device Role / Timing Role: Low-noise, wide-bandwidth ADC capturing fast optical pulses with minimal aperture jitter (50 ps). Use Value: 8.3 MHz full-power bandwidth supports pulse-width analysis; 300 ns acquisition time enables tight sampling window control. |
Use Scenario: Capturing RF front-end baseband signals in handheld spectrum analyzers and cellular field testers. IC Role / Device Role / Timing Role: Medium-speed ADC serving as digitizer for IF/BB signal paths where SNR and THD are critical. Use Value: −75 dB THD and −76 dB SFDR suppress harmonic artifacts; no pipeline delay ensures accurate transient capture. |
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 |
|---|---|---|---|
| AD7476ARZ-REEL7 | Same 12-bit SAR architecture but 1.25 MSPS max; lower power (3.3 mW @ 3 V); no VDRIVE pin - logic I/O tied to VDD | Best suited for fixed 3 V systems where higher speed justifies tighter layout constraints and loss of voltage-flexible interfacing | Select when throughput >1 MSPS is required and VDD/VDRIVE decoupling is unnecessary |
| ADS7822U | 12-bit, 200 kSPS max; SPI interface only; integrated reference; 2.7 V–5.5 V supply; 1.25 mW @ 3 V | Targeted at cost-sensitive, lower-speed applications like battery monitors and simple data loggers where on-chip reference reduces BOM count | Select when system-level power budget is <1.5 mW and 200 kSPS suffices - not for 1 MSPS real-time use |
Compared with AD7475AR-REEL7, AD7476ARZ-REEL7 trades VDRIVE flexibility for higher speed and lower power, while ADS7822U sacrifices speed and external reference control for integration and ultra-low static consumption - making AD7475AR-REEL7 optimal for portable, mixed-voltage, 1 MSPS applications requiring precision and configurability.
Availability
AD7475AR-REEL7 is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial sensor interfaces, optical sensor signal chains, and mobile communication test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7475AR-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 Norwood, MA, with design centers worldwide and a 50+ year heritage in precision data conversion.
The AD7475AR-REEL7 belongs to Analog Devices' high-speed, micropower SAR ADC product line, engineered specifically for battery-powered and space-constrained systems demanding 12-bit accuracy at 1 MSPS with minimal power and flexible logic interfacing.
FAQ
What is the maximum sampling rate supported by the AD7475AR-REEL7?
The AD7475AR-REEL7 supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK. Conversion time is fixed at 800 ns (16 SCLK cycles), and the device guarantees this rate across its full operating temperature range (−40°C to +85°C) and supply range (2.7 V to 5.25 V). This makes AD7475AR-REEL7 suitable for real-time acquisition of fast-changing sensor signals without interpolation or oversampling.
Does the AD7475AR-REEL7 include an internal voltage reference?
No, the AD7475AR-REEL7 does not include an internal voltage reference. It requires an external 2.5 V ±1% reference applied to the REF IN pin. In contrast, the pin-compatible AD7495 variant integrates a 2.5 V reference buffered on the REF OUT pin. For AD7475AR-REEL7, designers must provide a stable, low-noise external reference (e.g., AD780 or ADR3425) with ≥0.1 µF local decoupling to ensure specified DC accuracy and SINAD performance.
How does the VDRIVE pin function in the AD7475AR-REEL7?
The VDRIVE pin on the AD7475AR-REEL7 sets the logic voltage level for all digital I/O pins (CS, SCLK, SDATA), independent of the analog supply VDD. This allows the AD7475AR-REEL7 to interface directly with 3 V microcontrollers or FPGAs even when powered from a 5 V VDD rail - eliminating level shifters and reducing board area. VDRIVE accepts 2.7 V to 5.25 V and defines VOH (VDRIVE − 0.2 V min) and VOL (0.4 V max) thresholds per the datasheet.
What power-saving modes does the AD7475AR-REEL7 support?
The AD7475AR-REEL7 supports three power states: Normal Mode (1.5 mA @ 3 V / 1 MSPS), Partial Power-Down Mode (450 µA @ 100 kSPS), and Full Power-Down Mode (1 µA max). These modes are controlled via the CS pin sequence and require no additional control lines. Full shutdown retains register state and achieves 20 µs wake-up time, making AD7475AR-REEL7 ideal for duty-cycled sensing applications such as wearable health monitors.
Is the AD7475AR-REEL7 pin-compatible with other devices in the AD7475/AD7495 family?
Yes, the AD7475AR-REEL7 shares identical 8-lead MSOP pinout and footprint with AD7475BRZ-REEL7, AD7495ARZ-REEL7, and AD7495BRZ-REEL7. However, functional compatibility is limited: AD7475 variants require external REF IN, while AD7495 variants output REF OUT and cannot accept external references. Swapping AD7475AR-REEL7 for AD7495ARZ-REEL7 requires PCB-level changes to reference routing and decoupling.
AD7475AR-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):
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7475AR-REEL7 FAQ
1.How can I place an order for AD7475AR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7475AR-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 AD7475AR-REEL7 reliable?
The price and inventory of AD7475AR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7475AR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7475AR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7475AR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7475AR-REEL7?
AD7475AR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7475AR-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 AD7475AR-REEL7?
For technical support, including AD7475AR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7475AR-REEL7 requirements.
6.How does Aetrix verify that AD7475AR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7475AR-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 AD7475AR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7475AR-REEL7?
All AD7475AR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7475AR-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 AD7475AR-REEL7 part is unused and in its original packaging.
Return procedure for AD7475AR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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