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Analog Devices Inc./Maxim Integrated MAX4477ASA
- Part No.:
- MAX4477ASA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4477ASA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,647
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Product details
Overview
MAX4477ASA from Maxim Integrated is a dual, rail-to-rail output, low-noise, low-distortion operational amplifier optimized for precision signal conditioning in single-supply systems. It delivers 10MHz gain-bandwidth product, 0.0002% THD+N at 1kHz (1kΩ load), 4.5nV/√Hz input voltage-noise density, and operates from +2.7V to +5.5V - making it ideal for high-fidelity ADC buffering and sensor front-ends in medical instrumentation.
For engineers reviewing the MAX4477ASA datasheet, MAX4477ASA pinout, MAX4477ASA application, or MAX4477ASA equivalent, key selection criteria include its unity-gain stability, ground-sensing input range (extends to VSS − 0.1V), rail-to-rail output swing (within 80mV of rails at 1kΩ), shutdown capability (not applicable to MAX4477), and SO-8 package compatibility with legacy layouts.
Technical Context
The MAX4477ASA belongs to the MAX4475–MAX4478 family - unity-gain stable, internally compensated op amps with BiCMOS process architecture. Its input stage supports common-mode voltages down to 0.1V below VSS and up to VDD − 1.7V, enabling true ground-referenced sensing in single-supply configurations. The dual amplifier structure shares a common supply and thermal environment, supporting matched DC performance (±750µV max VOS over temperature) and low crosstalk (−90dB at 10kHz).
It features a push-pull output stage capable of ±5mA drive into resistive loads and stable operation with capacitive loads up to 200pF. Unlike the MAX4488/MAX4489 variants, the MAX4477ASA does not include shutdown functionality and is specified only for gains ≥ 1V/V with full 10MHz bandwidth and 70° phase margin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - enables stable closed-loop operation at unity gain with sufficient loop gain for precision DC and AC applications up to ~100kHz. |
| THD+N (1kHz, 2VP-P, 1kΩ) | 0.0002% - ensures minimal harmonic corruption in audio, DAC output, and high-resolution sensor signal chains. |
| Input Voltage-Noise Density | 4.5nV/√Hz at 1kHz - critical for preserving SNR in low-level signal amplification (e.g., strain gauges, piezoelectric sensors). |
| Input Offset Voltage (max) | ±750µV over −40°C to +125°C - supports accurate DC-coupled measurement without frequent calibration. |
| Rail-to-Rail Output Swing | Within 80mV of VDD/VSS at 1kΩ load - maximizes dynamic range in low-voltage (2.7V–5.5V) systems. |
| Supply Voltage Range | +2.7V to +5.5V - compatible with Li-ion, USB, and industrial 3.3V/5V rails without level-shifting. |
| Quiescent Current per Amp | 2.5mA at VDD = 5V - balances low-noise performance with moderate power consumption for always-on analog stages. |
Pinout & Package
MAX4477ASA is housed in an 8-pin SO (Small Outline) package (package code S8+4), with exposed pad not present. Pin assignments are fully defined in the datasheet for dual-amplifier configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Output of Amplifier A - rail-to-rail capable, drives loads ≥ 1kΩ while maintaining DC accuracy. |
| 2 | INA− | Inverting input of Amplifier A - high-impedance (1000GΩ), supports ground-sensing down to VSS − 0.1V. |
| 3 | INA+ | Noninverting input of Amplifier A - matched bias current (±1pA typ) minimizes offset drift in high-Z sensor interfaces. |
| 4 | VSS | Negative supply - connect to ground in single-supply mode; supports dual-supply operation down to ±1.35V. |
| 5 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor close to pin for noise immunity. |
| 6 | INB+ | Noninverting input of Amplifier B - electrically isolated but thermally coupled to Amplifier A for matched drift. |
| 7 | INB− | Inverting input of Amplifier B - identical DC/AC specs to INA±; enables differential or independent channel use. |
| 8 | OUTB | Output of Amplifier B - independently configurable; no internal connection to OUTA or SHDN (not present on MAX4477). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full supply voltage utilization - e.g., 0.08V to 4.92V swing on 5V rail with 1kΩ load, preserving ADC input range. |
| Ground-sensing input range | Accepts inputs from VSS − 0.1V to VDD − 1.7V - enables direct interfacing to 0V-referenced transducers without level shifters. |
| Ultra-low THD+N | 0.0002% at 1kHz ensures <16-bit ENOB preservation in DAC buffer and audio preamp roles. |
| Low input voltage-noise density | 4.5nV/√Hz at 1kHz maintains signal integrity in mic preamps and strain gauge bridges where source impedance is <10kΩ. |
| Unity-gain stability | No external compensation required - simplifies layout and reduces component count in gain-of-1 buffers and active filters. |
Applications
| ADC Buffers | DAC Output Amplifiers |
|---|---|
Use Scenario: Driving the input of a 16-bit SAR ADC (e.g., MAX11270) with unbuffered sensor output. IC Role / Device Role / Timing Role: Precision voltage follower providing high-Z input isolation and low-noise, rail-to-rail output drive. Use Value: Input bias current ≤150pA (max) prevents gain error in high-impedance sensor paths; 0.0002% THD+N preserves effective resolution. | Use Scenario: Buffering the output of a precision DAC (e.g., MAX5541) to drive variable loads. IC Role / Device Role / Timing Role: Low-offset, low-drift output amplifier ensuring monotonicity and settling within 2µs to 0.01%. Use Value: ±750µV VOS max over temperature eliminates need for system-level trimming; rail-to-rail swing matches DAC full-scale range. |
| Low-Noise Microphone/Preamplifiers | Strain Gauges/Sensor Amplifiers |
Use Scenario: First-stage amplification of electret microphone output in battery-powered voice recorders. IC Role / Device Role / Timing Role: High-input-impedance, low-noise transimpedance or noninverting amplifier with DC-coupled output. Use Value: 4.5nV/√Hz noise density dominates over typical mic self-noise; 2.5mA quiescent current enables >100hr operation on coin cell. | Use Scenario: Amplifying mV-level bridge outputs from metal foil strain gauges in industrial load cells. IC Role / Device Role / Timing Role: Instrumentation-grade dual-op-amp configured as difference amplifier with matched gain paths. Use Value: Dual topology enables matched VOS and TCVOS between channels; 10MHz GBW supports anti-alias filtering up to 100kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333AIDR | Zero-drift architecture; 0.02µV/°C max TCVOS vs. ±0.3µV/°C for MAX4477ASA; lower 1/f noise but higher 1kHz voltage noise (5.5nV/√Hz). | Better long-term DC stability in temperature-varying environments; less suitable for wideband audio due to chopper artifacts. | Select OPA2333AIDR when ultra-low drift dominates over wideband noise; MAX4477ASA preferred for <100kHz signal chains requiring flat noise spectrum. |
| AD8628ARZ-REEL7 | Zero-drift, 1.5µV max VOS (typ), 4.2nV/√Hz noise at 1kHz, but only 2.5MHz GBW and 1V/µs slew rate. | Superior DC accuracy for µV-level measurements; insufficient bandwidth for >50kHz filter or fast-settling DAC buffering. | Choose AD8628ARZ-REEL7 for DC-critical sensor nodes; retain MAX4477ASA where 10MHz GBW and 3V/µs slew rate are required for dynamic signal fidelity. |
Compared with OPA2333AIDR and AD8628ARZ-REEL7, the MAX4477ASA offers the best balance of wide bandwidth (10MHz), ultra-low broadband noise (4.5nV/√Hz), and proven rail-to-rail output drive into 1kΩ - making it optimal for mixed-signal applications demanding both precision and speed without zero-drift complexity.
Availability
MAX4477ASA is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor signal conditioning, and high-resolution data acquisition systems requiring stable component supply across extended temperature ranges (−40°C to +125°C).
Supply support for MAX4477ASA 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 precision, power, and interface applications.
The MAX4475–MAX4478 family was engineered specifically for low-noise, low-distortion signal conditioning in space-constrained, single-supply systems - targeting 16-bit+ data converters, portable medical devices, and industrial sensors.
FAQ
What is the operating temperature range for the MAX4477ASA?
The MAX4477ASA is rated for continuous operation from −40°C to +125°C. This extended industrial temperature range is validated per the datasheet's Absolute Maximum Ratings and DC Electrical Characteristics tables, ensuring reliable performance in automotive under-hood modules, industrial PLCs, and portable medical equipment where ambient temperatures exceed standard commercial limits.
Does the MAX4477ASA include a shutdown pin?
No, the MAX4477ASA does not feature a shutdown function. Shutdown capability is exclusive to the MAX4475 and MAX4488 variants (pin 5 in SOT23/TDFN packages). The MAX4477ASA - as a dual op amp in SO-8 - has no SHDN terminal; all pins are assigned to amplifier I/O or supplies per the official pinout diagram.
What is the maximum capacitive load the MAX4477ASA can drive stably?
The MAX4477ASA maintains stability with capacitive loads up to 200pF, as confirmed in the AC Electrical Characteristics table and Typical Operating Characteristics (Capacitive-Load Stability parameter). Driving larger loads requires external isolation resistance or feedback compensation to prevent peaking or oscillation.
Is the MAX4477ASA unity-gain stable?
Yes, the MAX4477ASA is unity-gain stable. As part of the MAX4475–MAX4478 family, it is internally compensated for stable operation at AV = +1V/V, with 70° phase margin and 12dB gain margin verified in the Gain and Phase vs. Frequency plots. No external compensation components are needed for gain-of-1 configurations.
What package type is used for the MAX4477ASA?
The MAX4477ASA uses an 8-pin SO (Small Outline) package with package code S8+4, outline number 21-0041, and land pattern number 90-0096. It is RoHS-compliant, lead(Pb)-free, and rated for 132°C/W junction-to-ambient thermal resistance on multi-layer PCBs.
MAX4477ASA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Push-Pull, 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 (x2 Channels)
- 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
MAX4477ASA FAQ
1.How can I place an order for MAX4477ASA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4477ASA 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 MAX4477ASA reliable?
The price and inventory of MAX4477ASA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4477ASA is usually 5 days.
3.What payment methods are accepted for MAX4477ASA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4477ASA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4477ASA?
MAX4477ASA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4477ASA 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 MAX4477ASA?
For technical support, including MAX4477ASA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4477ASA requirements.
6.How does Aetrix verify that MAX4477ASA is sourced from the original manufacturer or authorized distributors?
All MAX4477ASA 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 MAX4477ASA meets industry standards.
7.What is the process for return or replacement of MAX4477ASA?
All MAX4477ASA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4477ASA, 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 MAX4477ASA part is unused and in its original packaging.
Return procedure for MAX4477ASA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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