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Analog Devices Inc./Maxim Integrated MAX4475ASA+T
- Part No.:
- MAX4475ASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4475ASA+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:463
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Product details
Overview
MAX4475ASA+T from Maxim Integrated is a single, unity-gain stable, rail-to-rail output operational amplifier optimized for low-noise, low-distortion signal conditioning in precision analog systems. It delivers 10MHz gain-bandwidth, 4.5nV/√Hz input voltage-noise density, 0.0002% THD+N at 1kHz (1kΩ load), 2.2mA quiescent current, and operates from +2.7V to +5.5V single supply - making it ideal for ADC buffering and medical instrumentation front-ends.
For engineers reviewing the MAX4475ASA+T datasheet, MAX4475ASA+T pinout, MAX4475ASA+T application, or MAX4475ASA+T equivalent, key selection criteria include its rail-to-rail output swing with 1kΩ load, ground-sensing input (VCM includes VSS), shutdown capability (0.01µA), and SO-8 package compatibility with legacy layouts requiring low-noise, high-DC-accuracy amplification.
Technical Context
The MAX4475ASA+T employs a BiCMOS process to achieve ultra-low input voltage-noise density (4.5nV/√Hz at 1kHz) and sub-picoampere input bias current (±1pA typ), enabling high-fidelity amplification of high-impedance sources like piezoelectric sensors and DAC outputs. Its unity-gain stability and 10MHz GBW support wideband closed-loop configurations without external compensation.
It features true rail-to-rail output stage capable of swinging within 80mV of either rail into 1kΩ, while maintaining DC accuracy across –40°C to +125°C. The input common-mode range extends to VSS – 0.1V and up to VDD – 1.7V, ensuring robust operation near ground in single-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - supports stable unity-gain operation with sufficient loop gain for precision DC-coupled filters and buffers. |
| Input Voltage-Noise Density | 4.5nV/√Hz at 1kHz - enables high-resolution signal acquisition without degrading SNR in 16-bit ADC interfaces. |
| Total Harmonic Distortion + Noise | 0.0002% at 1kHz, 2VP-P, 1kΩ load - preserves signal fidelity in audio, instrumentation, and sensor signal chains. |
| Quiescent Supply Current | 2.2mA per amplifier at VDD = 3V - balances performance and power efficiency for always-on analog front-ends. |
| Rail-to-Rail Output Swing | Within 80mV of VDD/VSS into 1kΩ - maximizes dynamic range in low-voltage (2.7V–5.5V) systems. |
| Input Common-Mode Range | Includes VSS (down to VSS – 0.1V) - allows direct interfacing with ground-referenced transducers and single-ended DACs. |
| Shutdown Current | 0.01µA - enables system-level power gating without PCB layout changes. |
Pinout & Package
MAX4475ASA+T is supplied in an 8-pin SO (Small Outline) package (Package Code S8+4, Outline Number 21-0041), with thermal resistance θJA = 132°C/W on multi-layer board. Pin 1 is OUT; Pin 2 is IN−; Pin 3 is IN+; Pin 4 is VSS; Pin 5 is N.C.; Pin 6 is VDD; Pin 7 is SHDN; Pin 8 is N.C. The exposed paddle is not present in SO packages.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - rail-to-rail capable, drives 1kΩ loads while maintaining DC accuracy. |
| 2 | IN− | Inverting input - high-impedance (1000GΩ), low-bias-current node for feedback network connection. |
| 3 | IN+ | Noninverting input - accepts signals down to VSS – 0.1V; critical for ground-sensing applications. |
| 4 | VSS | Negative supply - connect to ground in single-supply operation; reference for exposed paddle in TDFN variants (not applicable here). |
| 5 | N.C. | No connection - internally unconnected; must be left floating or tied to ground per layout best practice. |
| 6 | VDD | Positive supply - operates from 2.7V to 5.5V; requires local 0.1µF ceramic bypass capacitor. |
| 7 | SHDN | Shutdown control - logic-high (≥0.7×VDD) enables amplifier; logic-low (≤0.3×VDD) reduces IDD to 0.01µA and places OUT in high-Z state. |
| 8 | N.C. | No connection - internally unconnected; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage-noise density | 4.5nV/√Hz at 1kHz - preserves SNR when amplifying microvolt-level sensor outputs. |
| Rail-to-rail output with 1kΩ load | Swings within 80mV of VDD/VSS - fully utilizes supply headroom in 3V systems for maximum ADC input range. |
| Ground-sensing input common-mode range | VCM includes VSS (to VSS – 0.1V) - eliminates level-shifting for single-ended, ground-referenced sources like strain gauges. |
| Low-power shutdown mode | Reduces supply current to 0.01µA and disables output - enables power cycling in battery-powered data loggers without signal leakage. |
| Unity-gain stability & 10MHz GBW | No external compensation required for AV = +1 - simplifies design of precision buffers and active filters up to ~100kHz. |
Applications
| ADC Buffers | DAC Output Amplifiers |
|---|---|
Use Scenario: Driving the input of a 16-bit SAR ADC (e.g., MAX11270) with unbuffered sensor signal. IC Role / Device Role / Timing Role: Precision voltage buffer isolating high-impedance source from ADC sampling capacitance. Use Value: Input bias current ≤150pA (max) prevents code-dependent offset errors; rail-to-rail output ensures full-scale utilization of ADC reference. | Use Scenario: Amplifying and level-shifting output of a 16-bit DAC (e.g., MAX5541) to ±2.5V bipolar range. IC Role / Device Role / Timing Role: Low-noise, low-distortion output driver with DC accuracy and fast settling (2µs to 0.01%). Use Value: 0.0002% THD+N preserves DAC spectral purity; shutdown mode enables dynamic power control during idle periods. |
| Low-Noise Microphone/Preamplifiers | Medical Instrumentation |
Use Scenario: First-stage amplification of electret microphone output in portable hearing aids or voice recorders. IC Role / Device Role / Timing Role: High-input-impedance, low-noise preamplifier with gain ≥20V/V and bandwidth >20kHz. Use Value: 4.5nV/√Hz noise floor dominates over microphone self-noise; 10MHz GBW supports flat frequency response up to 20kHz. | Use Scenario: Front-end amplification in ECG/EEG patient monitoring systems requiring >100dB CMRR and sub-µV resolution. IC Role / Device Role / Timing Role: Differential input buffer with high PSRR (120dB) and low input offset drift (±0.3µV/°C). Use Value: 70µV max VOS and 90dB min CMRR ensure accurate biopotential measurement; –40°C to +125°C rating supports clinical-grade reliability. |
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 |
|---|---|---|---|
| OPA376AIDR | Lower noise (4.2nV/√Hz), lower IQ (760µA), but only 5.5MHz GBW and no shutdown pin. | Lacks integrated shutdown; better suited for always-on, ultra-low-power sensor nodes where bandwidth <5MHz suffices. | Select OPA376AIDR when minimizing quiescent current is critical and shutdown functionality is implemented externally. |
| ADA4897-1ARJZ-R7 | Higher GBW (100MHz), lower distortion (0.00004% THD+N), but higher IQ (12mA) and no shutdown. | Optimized for high-speed, high-fidelity applications (e.g., ultrasound receive paths); unsuitable for battery-constrained designs. | Choose ADA4897-1ARJZ-R7 only when >10MHz bandwidth and sub-0.0001% THD+N are mandatory and power budget allows. |
Compared with OPA376AIDR and ADA4897-1ARJZ-R7, the MAX4475ASA+T uniquely combines 10MHz GBW, 0.0002% THD+N, 4.5nV/√Hz noise, and integrated shutdown in an SO-8 package - offering balanced performance for precision, power-aware industrial and medical signal chains.
Availability
MAX4475ASA+T is available at Aetrix Electronics and suitable for ADC buffering, DAC output amplification, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX4475ASA+T 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 industrial, automotive, and communications markets.
The MAX4475ASA+T belongs to the MAX4475–MAX4478 family of low-noise, rail-to-rail op amps engineered for precision signal conditioning in space-constrained, low-voltage systems demanding high DC accuracy and wide dynamic range.
FAQ
What is the operating temperature range for the MAX4475ASA+T?
The MAX4475ASA+T is specified for operation from –40°C to +125°C. This extended industrial temperature range ensures reliable performance in harsh environments such as automotive engine compartments, industrial PLC modules, and portable medical devices. All DC and AC specifications-including input offset voltage, THD+N, and gain-bandwidth-are guaranteed across this full range.
Does the MAX4475ASA+T support single-supply operation?
Yes, the MAX4475ASA+T supports true single-supply operation from +2.7V to +5.5V. Its input common-mode voltage range includes ground (VSS – 0.1V), and its rail-to-rail output swings within 80mV of both supply rails into a 1kΩ load. This enables direct interfacing with ground-referenced sensors and low-voltage ADCs without level-shifting circuitry.
What is the purpose of the SHDN pin on the MAX4475ASA+T?
The SHDN (shutdown) pin on the MAX4475ASA+T controls power-down mode: applying logic-low (≤0.3×VDD) reduces quiescent supply current to 0.01µA and places the output in high-impedance state. This feature enables dynamic power management in battery-powered instruments and data acquisition systems where intermittent signal processing is required.
Can the MAX4475ASA+T drive capacitive loads?
Yes, the MAX4475ASA+T is stable driving capacitive loads up to 200pF without oscillation, as confirmed by its capacitive-load stability specification. For loads >100pF, layout best practices-such as minimizing trace length between output and load, and avoiding long unterminated lines-are recommended to preserve phase margin and transient response integrity.
Is the MAX4475ASA+T pin-compatible with other packages in the MAX4475 family?
No, the MAX4475ASA+T (SO-8) is not pin-compatible with the SOT23-6 or TDFN-6 variants of the MAX4475 (e.g., MAX4475AUT+T or MAX4475ATT+T). While all share identical electrical functionality and pin *functions*, the SO-8 package has two no-connect (N.C.) pins (5 and 8) and relocates SHDN to Pin 7, whereas SOT23/TDFN place SHDN at Pin 5 and omit N.C. pins entirely.
MAX4475ASA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
MAX4475ASA+T FAQ
1.How can I place an order for MAX4475ASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4475ASA+T 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 MAX4475ASA+T reliable?
The price and inventory of MAX4475ASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4475ASA+T is usually 5 days.
3.What payment methods are accepted for MAX4475ASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4475ASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4475ASA+T?
MAX4475ASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4475ASA+T 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 MAX4475ASA+T?
For technical support, including MAX4475ASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4475ASA+T requirements.
6.How does Aetrix verify that MAX4475ASA+T is sourced from the original manufacturer or authorized distributors?
All MAX4475ASA+T 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 MAX4475ASA+T meets industry standards.
7.What is the process for return or replacement of MAX4475ASA+T?
All MAX4475ASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4475ASA+T, 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 MAX4475ASA+T part is unused and in its original packaging.
Return procedure for MAX4475ASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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