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Analog Devices Inc. AD7475AR-REEL
- Part No.:
- AD7475AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7475AR-REEL.pdf
- Description:
- IC ADC 12BIT SRL LP 8-SOIC T/R
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
AD7475AR-REEL from Analog Devices is a 12-bit, 1 MSPS successive-approximation ADC operating from a single 2.7 V to 5.25 V supply, featuring an external 2.5 V reference input (REF IN), no pipeline delay, and SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface. It delivers 68 dB SINAD at 300 kHz input frequency and consumes only 4.5 mW at 3 V/1 MSPS, targeting precision data acquisition in space-constrained, battery-powered instrumentation.
For engineers reviewing the AD7475AR-REEL datasheet, AD7475AR-REEL pinout, AD7475AR-REEL application, or AD7475AR-REEL equivalent, key selection criteria include its 12-bit resolution with ±1.5 LSB INL (A-grade), 800 ns max conversion time at 20 MHz SCLK, VDRIVE-independent 3 V/5 V logic interfacing, and 8-lead MSOP package compatibility with low-power, high-throughput analog-to-digital signal chains.
Technical Context
The AD7475AR-REEL implements a capacitive DAC-based successive-approximation architecture with a track-and-hold amplifier supporting >1 MHz input bandwidth. Conversion is initiated on the falling edge of CS, and sampling timing is precisely controlled without pipeline latency.
Its dual-supply flexibility separates analog power (VDD) from digital I/O voltage (VDRIVE), enabling direct interfacing to 3 V or 5 V processors regardless of VDD level. Power management includes three modes-normal, partial power-down (450 µA typ), and full shutdown (1 µA max)-with conversion rate governed solely by SCLK frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes for high-fidelity digitization of analog sensor or signal chain outputs. |
| Throughput Rate | 1 MSPS - supports real-time sampling of fast transients in medical instruments or optical sensor readouts. |
| SINAD | 68 dB min at 300 kHz - ensures ≥11.3 effective bits for accurate representation of dynamic signals in noisy environments. |
| Power Dissipation | 4.5 mW max at 3 V/1 MSPS - enables extended operation in portable devices without thermal derating. |
| Conversion Time | 800 ns max - fixed 16-cycle SCLK timing enables deterministic latency critical for closed-loop control systems. |
| Reference Input | 2.5 V ±1% REF IN - requires externally decoupled stable reference; defines full-scale analog input range as 0 V to 2.5 V. |
| Supply Range | VDD = 2.7 V to 5.25 V - supports wide-input industrial or automotive power rails without regulation overhead. |
Pinout & Package
AD7475AR-REEL is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for compact PCB layouts in portable and embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Reference Input | Accepts external 2.5 V ±1% reference; must be decoupled with ≥0.1 µF capacitor to GND for stable full-scale accuracy. |
| 2 - VIN | Analog Input | Single-ended input with 0 V to REF IN range; 20 pF input capacitance requires careful driver impedance matching. |
| 3 - GND | Analog Ground | Primary ground reference for all internal circuitry; must connect directly to low-impedance analog ground plane. |
| 4 - SCLK | Serial Clock Input | Provides clock for both data transfer and internal conversion timing; supports up to 20 MHz for 1 MSPS throughput. |
| 5 - SDATA | Serial Data Output | 3-state output delivering 12-bit result MSB-first after four leading zeros; driven by VDRIVE voltage level. |
| 6 - VDRIVE | Digital I/O Supply | Sets logic voltage for SDATA, SCLK, CS; independent of VDD, enabling mixed-voltage microprocessor interfacing. |
| 7 - CS | Chip Select | Active-low signal initiating conversion on falling edge and framing serial data; controls SDATA three-state enable. |
| 8 - VDD | Analog/Digital Core Supply | Powers internal SAR, T/H, and logic; 2.7–5.25 V range allows direct connection to unregulated battery or rail supplies. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Guarantees deterministic, one-shot conversion per CS assertion - essential for time-critical sampling in control loops. |
| VDRIVE voltage independence | Allows SDATA/SCLK/CS to operate at 3 V while VDD runs at 5 V (or vice versa), eliminating level-shifters in mixed-voltage systems. |
| Flexible power management | Three operational modes (normal/partial/full power-down) reduce average current to ≤100 µA during idle periods. |
| Wide input bandwidth | 68 dB SNR at 300 kHz input confirms suitability for anti-aliasing-limited applications like vibration sensing or audio front-ends. |
| Low aperture jitter | 50 ps typical jitter preserves signal integrity at high input frequencies, minimizing sampling-induced noise floor degradation. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Digitizing ECG or pulse oximeter analog front-end outputs in handheld diagnostic devices with limited battery capacity. IC Role / Device Role / Timing Role: Primary ADC capturing biopotential waveforms at ≥1 kSPS with minimal power overhead and precise timing control via CS-triggered sampling. Use Value: 4.5 mW consumption at 3 V extends battery life; 12-bit resolution captures subtle physiological features; MSOP footprint saves board area. |
Use Scenario: Sampling temperature, humidity, and pressure sensors in remote environmental monitoring nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated periodically by MCU to acquire sensor data, then entering full shutdown (1 µA) between samples. Use Value: Full power-down mode minimizes quiescent draw; external REF IN allows use of ultra-low-drift references for long-term measurement stability. |
| Industrial Sensor Signal Conditioning | Optical Sensor Interface |
Use Scenario: Converting outputs from strain gauges or RTDs in factory-floor condition monitoring systems exposed to electrical noise. IC Role / Device Role / Timing Role: High-SNR ADC placed close to sensor to minimize analog trace length, with CS-synchronized sampling rejecting burst interference. Use Value: 68 dB SINAD at 300 kHz rejects high-frequency EMI; 20 pF input capacitance simplifies anti-alias filter design. |
Use Scenario: Reading photodiode or CCD output in portable spectrometers or barcode scanners requiring fast, low-noise digitization. IC Role / Device Role / Timing Role: High-throughput ADC capturing transient optical pulses with precise aperture control to avoid motion blur or timing skew. Use Value: 1 MSPS rate resolves rapid light intensity changes; 10 ns aperture delay and 50 ps jitter preserve pulse fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 1 MSPS SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7476AR-REEL | Same 8-lead MSOP package and pinout; higher 1.25 MSPS throughput but reduced DC accuracy (±2 LSB INL vs. ±1.5 LSB). | Preferred where speed outweighs absolute linearity, e.g., high-speed waveform capture with post-processing calibration. | Select AD7476AR-REEL only if system-level calibration compensates for increased INL; otherwise AD7475AR-REEL provides better out-of-box accuracy. |
| ADS7822U | 12-bit, 200 kSPS max; uses SPI interface but lacks VDRIVE pin - requires matched VDD/VIO, limiting mixed-voltage flexibility. | Suitable for lower-speed, cost-sensitive designs where 1 MSPS is unnecessary and board space allows SOIC-8 instead of MSOP. | Choose ADS7822U when throughput demand is ≤200 kSPS and simplified supply routing justifies trade-off in speed and interface flexibility. |
Compared with AD7476AR-REEL and ADS7822U, AD7475AR-REEL uniquely balances 1 MSPS speed, ±1.5 LSB INL accuracy, VDRIVE-enabled mixed-voltage interfacing, and 4.5 mW ultra-low power - making it optimal for battery-constrained, precision data acquisition where deterministic timing and minimal layout complexity are critical.
Availability
AD7475AR-REEL is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, and industrial sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for AD7475AR-REEL 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, communications, and healthcare markets since 1965.
The AD7475AR-REEL belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-speed digitization in space- and energy-constrained applications where accuracy, timing determinism, and supply flexibility are non-negotiable.
FAQ
What is the maximum sampling rate supported by the AD7475AR-REEL?
The AD7475AR-REEL supports a maximum throughput rate of 1 MSPS, achieved when the serial clock (SCLK) operates at 20 MHz. Its conversion time is fixed at 16 SCLK cycles (800 ns max), and the device guarantees no pipeline delay - meaning each conversion completes before the next CS assertion can initiate another sample. This makes AD7475AR-REEL suitable for real-time applications requiring consistent, low-latency sampling such as closed-loop motor control or vibration analysis.
Does the AD7475AR-REEL include an internal voltage reference?
No, the AD7475AR-REEL does not include an internal voltage reference. It requires an external 2.5 V ±1% reference applied to the REF IN pin to define its full-scale analog input range (0 V to 2.5 V). This differs from the pin-compatible AD7495, which integrates a 2.5 V reference on-chip (REF OUT). The external reference architecture of AD7475AR-REEL allows system designers to select higher-precision or lower-drift references (e.g., ADR4525) when ultimate DC accuracy is required.
Can the AD7475AR-REEL interface directly with a 3 V microcontroller while powered from a 5 V supply?
Yes, the AD7475AR-REEL supports mixed-voltage interfacing via its dedicated VDRIVE pin. When VDD = 5 V and VDRIVE = 3 V, the digital interface pins (SCLK, CS, SDATA) operate at 3 V logic levels, enabling direct connection to 3 V microcontrollers without level shifters. This VDRIVE functionality is explicitly specified in the AD7475AR-REEL datasheet and validated across temperature and process corners - a key differentiator for systems integrating diverse supply domains.
What power-saving modes does the AD7475AR-REEL offer, and how much current do they draw?
The AD7475AR-REEL provides three power-saving modes: normal (1.5 mA max at 3 V/1 MSPS), partial power-down (100 µA max static), and full power-down (1 µA max). In full shutdown, the device retains no state and requires 20 µs to power up and stabilize before the first valid conversion. These modes are controlled exclusively through the standard SPI interface - no additional control pins are needed - allowing firmware-driven optimization of average power in duty-cycled applications like wireless sensor nodes.
Is the AD7475AR-REEL pin-compatible with other members of the AD7475/AD7495 family?
Yes, the AD7475AR-REEL shares identical 8-lead MSOP pinout and pin functions with AD7475BR-REEL, AD7495AR-REEL, and AD7495BR-REEL. However, pin compatibility does not imply functional interchangeability: AD7475 variants require external REF IN, while AD7495 variants provide REF OUT and exhibit higher gain error (±7 LSB vs. ±3 LSB). Swapping AD7475AR-REEL for AD7495AR-REEL without circuit modification will cause reference misconfiguration and invalid conversions.
AD7475AR-REEL 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-REEL FAQ
1.How can I place an order for AD7475AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7475AR-REEL 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-REEL reliable?
The price and inventory of AD7475AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7475AR-REEL is usually 5 days.
3.What payment methods are accepted for AD7475AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7475AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7475AR-REEL?
AD7475AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7475AR-REEL 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-REEL?
For technical support, including AD7475AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7475AR-REEL requirements.
6.How does Aetrix verify that AD7475AR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7475AR-REEL 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-REEL meets industry standards.
7.What is the process for return or replacement of AD7475AR-REEL?
All AD7475AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7475AR-REEL, 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-REEL part is unused and in its original packaging.
Return procedure for AD7475AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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