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Analog Devices Inc./Maxim Integrated MAX4475AUA+
- Part No.:
- MAX4475AUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4475AUA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:167
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Product details
Overview
The MAX4475AUA+ from Maxim Integrated is a single, rail-to-rail output, low-noise, low-distortion operational amplifier optimized for precision signal conditioning in single-supply systems. It delivers 10MHz gain-bandwidth, 0.0002% THD+N at 1kHz, 4.5nV/√Hz input voltage-noise density, and operates from +2.7V to +5.5V - making it ideal for high-fidelity DAC output buffering and medical sensor front-ends.
For engineers reviewing the MAX4475AUA+ datasheet, MAX4475AUA+ pinout, MAX4475AUA+ application, or MAX4475AUA+ equivalent, this page provides verified technical context, package-specific pin mapping (µMAX-8), real-world application cards, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The MAX4475AUA+ is unity-gain stable with a 10MHz gain-bandwidth product and 3V/µs slew rate, enabling accurate amplification of wideband analog signals without oscillation. Its input stage features ultra-low input bias current (±1pA typ) and ground-sensing capability (input common-mode range extends to VSS − 0.2V), supporting direct interfacing with transducer outputs referenced to ground.
It integrates a low-power shutdown mode (SHDN pin) that reduces supply current to 0.01µA and places the output in high-impedance state - critical for power-gated sensor nodes. The device maintains rail-to-rail output swing within 80mV of supplies into 1kΩ load while preserving DC accuracy (VOS = ±70µV, AVOL = 120dB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - supports stable closed-loop operation up to 1MHz with gain ≥1, suitable for anti-aliasing filters and DAC reconstruction stages. |
| THD+N @ 1kHz, RL = 1kΩ | 0.0002% - enables 16-bit+ dynamic range preservation in audio and instrumentation signal chains. |
| Input Voltage-Noise Density | 4.5nV/√Hz @ 1kHz - minimizes added noise when amplifying microvolt-level sensor signals (e.g., strain gauges, piezoelectrics). |
| Input Bias Current | ±1pA (typ) - prevents significant offset error when driving high-impedance sources like pH electrodes or photodiode transimpedance feedback networks. |
| Rail-to-Rail Output Swing | Within 80mV of VDD/VSS into 1kΩ - maximizes usable dynamic range in low-voltage (3V/3.3V) systems without level-shifting circuitry. |
| Shutdown Current | 0.01µA - allows integration into battery-powered devices requiring µA-level sleep-state leakage budgets. |
| Supply Voltage Range | +2.7V to +5.5V - compatible with Li-ion, USB, and industrial 3.3V/5V rails without external regulators. |
Pinout & Package
The MAX4475AUA+ is housed in an 8-pin µMAX® package (package code U8+4), featuring exposed-pad thermal enhancement and RoHS-compliant lead-free finish. This compact 3mm × 3mm footprint supports high-density PCB layouts while delivering θJA = 206°C/W (multi-layer board) for reliable operation up to +125°C ambient.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - rail-to-rail capable; drives loads down to 1kΩ while maintaining DC accuracy and stability with ≤200pF capacitive load. |
| 2 | IN− | Inverting input - high-impedance node (RIN = 1000GΩ); requires matched trace routing to minimize common-mode rejection degradation. |
| 3 | IN+ | Noninverting input - accepts common-mode voltages from VSS − 0.2V to VDD − 1.6V; enables true ground-referenced sensing. |
| 4 | VSS | Negative supply - connect directly to system ground in single-supply configurations; also ties exposed paddle (EP) in µMAX package. |
| 5 | SHDN | Shutdown control - logic-high (>0.7×VDD) enables amplifier; logic-low (<0.3×VDD) disables output and reduces IDD to 0.01µA. |
| 6 | N.C. | No connection - not internally bonded; leave unconnected or tie to VSS for mechanical stability (not electrically required). |
| 7 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor placed <1mm from pin to suppress high-frequency supply noise coupling. |
| 8 | EP | Exposed thermal paddle - must be soldered to solid ground plane to achieve specified θJA and ensure thermal reliability at full load. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low THD+N | 0.0002% at 1kHz ensures distortion remains below −114dBc, preserving SNR in 16-bit ADC/DAC interfaces without post-processing correction. |
| Ground-sensing input | Input common-mode range includes VSS − 0.2V, enabling direct connection to 0V-referenced sensors (e.g., bridge-based load cells) without level-shifting resistors. |
| Rail-to-rail output drive | Delivers full-scale swing into 1kΩ while maintaining >85dB large-signal voltage gain - eliminates need for external level translators in 3.3V data acquisition systems. |
| Low-power shutdown | Reduces quiescent current to 0.01µA and forces output high-Z, enabling dynamic power gating in portable instrumentation with multi-channel sequencing. |
| High open-loop gain | 120dB AVOL ensures <1µV error contribution from finite gain in unity-gain buffer configurations, critical for precision reference buffering. |
Applications
| ADC Buffers | DAC Output Amplifiers |
|---|---|
|
Use Scenario: Driving the input of a 16-bit SAR ADC (e.g., MAX11206) with a high-impedance source such as a precision voltage divider or filtered sensor output. IC Role / Device Role / Timing Role: Unity-gain buffer isolating source impedance from ADC sampling capacitance; maintains DC accuracy and settles within 2µs to 0.01%. Use Value: Prevents missing codes due to settling errors; 70µV VOS and 1pA IBIAS avoid introducing offset/gain drift in calibrated measurement paths. |
Use Scenario: Amplifying and level-shifting the unbuffered voltage output of a 16-bit DAC (e.g., MAX5541) to drive a 0–5V actuator interface. IC Role / Device Role / Timing Role: Precision output amplifier with rail-to-rail swing and low THD+N, configured for gain-of-2 or unity gain depending on DAC reference. Use Value: Eliminates 16-bit linearity errors caused by DAC output loading; 0.0002% THD+N preserves spectral purity in closed-loop control signals. |
| Low-Noise Microphone/Preamplifiers | Strain Gauges/Sensor Amplifiers |
|
Use Scenario: First-stage amplification of electret microphone output in voice-controlled IoT endpoints operating from 3.3V supply. IC Role / Device Role / Timing Role: Low-noise, low-current preamp with gain ≥20V/V; powered from same rail as MCU to simplify power architecture. Use Value: 4.5nV/√Hz input noise dominates only above ~1kHz; combined with 1pA IBIAS, enables >65dB SNR in 100Hz–10kHz audio band. |
Use Scenario: Instrumentation amplifier front-end for quarter-bridge strain gauge in industrial weight scale with 2.7V battery supply. IC Role / Device Role / Timing Role: Single-op-amp difference amplifier (gain = 100V/V) with ground-sensing inputs accepting mV-level bridge outputs referenced to system ground. Use Value: Input CMVR down to VSS − 0.2V avoids need for negative supply; 70µV VOS contributes <0.07% FS error before calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA376AIDBVR | Lower input voltage noise (2.8nV/√Hz), but higher THD+N (0.0006%), no shutdown pin, and 5.5MHz GBW. | Better for ultra-low-noise DC-coupled sensor amps; unsuitable where shutdown control or >5MHz bandwidth is required. | Select OPA376AIDBVR when noise floor dominates over distortion and shutdown is unnecessary. |
| ADA4897-1ARJZ-R7 | Higher GBW (100MHz), lower input bias current (0.2pA), but higher supply current (1.2mA vs. 2.2mA) and no integrated shutdown. | Preferred for high-speed pulse amplification or wideband active filtering; less optimal for battery-constrained, low-power systems. | Choose ADA4897-1ARJZ-R7 when bandwidth >10MHz is mandatory and power budget allows >5× higher IDD. |
Compared with OPA376AIDBVR and ADA4897-1ARJZ-R7, the MAX4475AUA+ uniquely balances sub-5nV/√Hz noise, 0.0002% THD+N, 10MHz bandwidth, and integrated shutdown in a thermally enhanced µMAX package - making it the optimal choice for precision, low-power, single-supply instrumentation where all four attributes are simultaneously required.
Availability
The MAX4475AUA+ is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor signal conditioning, and portable DAC/ADC interface designs requiring stable component supply across extended temperature ranges (−40°C to +125°C) and long production lifecycles.
Supply support for MAX4475AUA+ 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
Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for demanding industrial, automotive, and medical applications, with emphasis on precision, low power, and robustness.
The MAX4475AUA+ belongs to Maxim's low-noise, rail-to-rail op amp family targeting high-dynamic-range signal chains - specifically engineered for 16-bit+ data converters, sensor front-ends, and battery-operated precision instrumentation.
FAQ
What is the maximum capacitive load the MAX4475AUA+ can drive without oscillation?
The MAX4475AUA+ is stable driving capacitive loads up to 200pF without external compensation. This specification is verified under standard test conditions (AV = +1V/V, RL = 10kΩ to VDD/2). For loads exceeding 200pF, a series resistor (typically 10–50Ω) should be placed between the output and capacitive node to isolate the amplifier's output stage and maintain phase margin. The MAX4475AUA+'s internal compensation ensures this stability limit holds across its full operating temperature range (−40°C to +125°C).
Does the MAX4475AUA+ support dual-supply operation?
Yes, the MAX4475AUA+ supports dual-supply operation from ±1.35V to ±2.75V, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. When used in dual-supply mode, VSS is connected to the negative rail (e.g., −2.7V) and VDD to the positive rail (e.g., +2.7V). Input common-mode range extends from (VSS − 0.2V) to (VDD − 1.6V), and rail-to-rail output swing remains functional relative to both supplies. Bypass capacitors must be placed from each supply to ground.
What is the purpose of Pin 6 (N.C.) on the MAX4475AUA+ µMAX package?
Pin 6 on the MAX4475AUA+ is designated N.C. (No Connection) - it is not internally bonded to any die function and carries no electrical signal. Per Maxim's datasheet and package drawing (Outline 21-0036), this pin may be left floating or optionally tied to VSS for mechanical reinforcement during reflow soldering. It must never be connected to SHDN, VDD, or any active signal, as doing so could compromise package integrity or cause undefined behavior.
How does the shutdown feature of the MAX4475AUA+ affect output state?
When the SHDN pin (Pin 5) of the MAX4475AUA+ is pulled low (<0.3×VDD), the amplifier enters shutdown mode: supply current drops to 0.01µA (typ), and the output is placed in a high-impedance (Hi-Z) state - effectively disconnecting it from the load. This behavior is explicitly confirmed in the datasheet's "Shutdown Mode" section and DC Electrical Characteristics table. The output does not clamp to VDD or VSS; it floats, allowing safe multiplexing or sharing of output nodes in multi-amplifier systems.
Is the MAX4475AUA+ qualified for automotive applications?
No, the MAX4475AUA+ is not AEC-Q100 qualified. Automotive-grade variants are explicitly marked with "/V" suffixes (e.g., MAX4475AUT/V+T for SOT23 or MAX4475AUA/V+T for µMAX). The MAX4475AUA+ is rated for industrial temperature range (−40°C to +125°C) and meets RoHS compliance, but lacks the extended reliability testing, failure analysis, and documentation required for automotive qualification. For automotive use, select the /V-suffixed version or consult Maxim's official automotive product matrix.
MAX4475AUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 2.5mA
- Current - Output / Channel:
- 48 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4475AUA+ FAQ
1.How can I place an order for MAX4475AUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4475AUA+ 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 MAX4475AUA+ reliable?
The price and inventory of MAX4475AUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4475AUA+ is usually 5 days.
3.What payment methods are accepted for MAX4475AUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4475AUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4475AUA+?
MAX4475AUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4475AUA+ 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 MAX4475AUA+?
For technical support, including MAX4475AUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4475AUA+ requirements.
6.How does Aetrix verify that MAX4475AUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4475AUA+ 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 MAX4475AUA+ meets industry standards.
7.What is the process for return or replacement of MAX4475AUA+?
All MAX4475AUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4475AUA+, 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 MAX4475AUA+ part is unused and in its original packaging.
Return procedure for MAX4475AUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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