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Analog Devices Inc./Maxim Integrated MAX4477AUA
- Part No.:
- MAX4477AUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4477AUA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,834
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Product details
Overview
MAX4477AUA from Maxim Integrated is a dual, 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), and operates from +2.7V to +5.5V single supply - ideal for buffering 16-bit DAC outputs in medical instrumentation and sensor interfaces.
For engineers reviewing the MAX4477AUA datasheet, MAX4477AUA pinout, MAX4477AUA application, or MAX4477AUA equivalent, this page provides verified circuit role, package mapping (8-pin µMAX), thermal performance (θJA = 206°C/W multi-layer), shutdown capability absence, and design-meaningful specs including rail-to-rail swing into 1kΩ and ground-sensing input common-mode range.
Technical Context
The MAX4477AUA is a dual-channel op amp within the MAX4475–MAX4478 family, internally compensated for unity-gain stability with 10MHz GBW and 3V/µs slew rate per amplifier. Its BiCMOS process enables ultra-low input bias current (±1pA typ) and high open-loop gain (120dB), supporting DC-accurate active filters and precision buffer stages without phase reversal under overdrive.
It features true rail-to-rail output swing (within 80mV of rails into 1kΩ), input common-mode range extending 0.1V below VSS and up to VDD – 1.7V, and robust capacitive-load drive capability (stable up to 200pF). No shutdown pin is present - distinguishing it from MAX4475/MAX4488 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - supports stable closed-loop operation at unity gain with sufficient loop gain for 100kHz filter designs. |
| Input Voltage-Noise Density | 4.5nV/√Hz at 1kHz - enables high-fidelity amplification of microvolt-level sensor signals without degrading SNR. |
| Total Harmonic Distortion + Noise | 0.0002% at 1kHz, 2VP-P, RL = 1kΩ - preserves signal integrity in audio and precision measurement paths. |
| Supply Voltage Range | +2.7V to +5.5V single supply - compatible with Li-ion, 3.3V, and 5V system rails without level-shifting. |
| Input Common-Mode Range | VSS – 0.1V to VDD – 1.7V - allows direct interfacing with ground-referenced transducers and ADC references. |
| Rail-to-Rail Output Swing | Within 80mV of VDD/VSS into 1kΩ - maximizes dynamic range in low-voltage data acquisition systems. |
| Quiescent Supply Current | 2.2mA per amplifier at VDD = 3V - balances performance and power in battery-operated instrumentation. |
Pinout & Package
MAX4477AUA is housed in an 8-pin µMAX® package (package code U8+4), featuring exposed-pad thermal enhancement and RoHS-compliant construction. The µMAX footprint (90-0092 land pattern) supports high-density PCB layouts while delivering θJA = 206°C/W on multi-layer boards.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives loads down to 1kΩ while maintaining DC accuracy and rail-to-rail swing. |
| 2 | INA− | Inverting input of Amplifier A - high-impedance node (1000GΩ) requiring guarded layout for low-noise operation. |
| 3 | INA+ | Noninverting input of Amplifier A - accepts common-mode voltages from VSS – 0.1V to VDD – 1.7V. |
| 4 | VSS | Negative supply - connect directly to system ground in single-supply configurations. |
| 5 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor placed adjacent to pin for PSRR optimization. |
| 6 | INB+ | Noninverting input of Amplifier B - electrically isolated from Amplifier A; shares same VDD/VSS rails. |
| 7 | INB− | Inverting input of Amplifier B - matched to INA− for common-mode rejection in differential configurations. |
| 8 | OUTB | Amplifier B output - independently configurable; no internal connection to OUTA or shutdown logic. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage-noise density | 4.5nV/√Hz at 1kHz enables <1µV RMS noise contribution in 100kHz bandwidth sensor front-ends. |
| Rail-to-rail output with 1kΩ drive | Maintains full output swing and DC accuracy into low-impedance loads - critical for driving ADC reference buffers. |
| Ground-sensing input stage | Common-mode range includes VSS – 0.1V, allowing direct connection to piezoelectric sensors and bridge transducers. |
| Unity-gain stable architecture | Guaranteed stability without external compensation - simplifies design of gain-of-1 buffers and integrators. |
| No phase reversal under overdrive | Prevents catastrophic output latch-up when inputs exceed common-mode limits - enhances system reliability. |
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. IC Role / Device Role / Timing Role: Precision unity-gain buffer isolating source impedance from ADC sampling capacitance. Use Value: Input bias current ≤150pA prevents code-dependent offset errors; rail-to-rail swing maximizes ADC utilization. | Use Scenario: Amplifying and level-shifting the unbuffered output of a 16-bit DAC (e.g., MAX5541). IC Role / Device Role / Timing Role: Low-noise, DC-accurate output stage ensuring monotonicity and integral nonlinearity <1 LSB. Use Value: 0.0002% THD+N preserves harmonic fidelity; 120dB open-loop gain minimizes gain error. |
| Low-Noise Microphone/Preamplifiers | Strain Gauges/Sensor Amplifiers |
Use Scenario: First-stage amplification of electret microphone output in portable audio recorders. IC Role / Device Role / Timing Role: High-Z, low-noise preamp with gain ≥20V/V before anti-alias filtering. Use Value: 4.5nV/√Hz input noise dominates over typical 10–20mV/Pa mic sensitivity; 10MHz GBW supports wideband audio capture. | Use Scenario: Instrumentation amplifier front-end for quarter-bridge strain gauge measurements. IC Role / Device Role / Timing Role: Dual-op-amp configured as difference amplifier with matched gain paths. Use Value: Matched IN+ / IN− input characteristics minimize CMRR degradation; 70µV max VOS reduces zero-point drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual, low-noise, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2188AIDR | Zero-drift architecture; 0.005µV/°C VOS drift vs. ±6µV/°C for MAX4477AUA; higher quiescent current (1.2mA vs. 2.2mA per amp). | Better long-term DC stability in temperature-varying environments; less suitable for battery-powered systems due to higher IQ. | Select OPA2188AIDR when VOS drift dominates error budget; retain MAX4477AUA for optimal noise/power trade-off in AC-coupled or moderate-temp applications. |
| AD8602ARZ | Lower GBW (10MHz same), but higher input voltage noise (12nV/√Hz); no guaranteed rail-to-rail swing into 1kΩ (min 100mV from rail). | Acceptable for lower-resolution (12–14-bit) systems where noise floor is less critical; may require larger headroom in low-VDD designs. | Choose AD8602ARZ for cost-sensitive industrial controls; prefer MAX4477AUA when 16-bit fidelity and full rail utilization are mandatory. |
Compared with OPA2188AIDR and AD8602ARZ, the MAX4477AUA uniquely combines 4.5nV/√Hz noise, guaranteed rail-to-rail swing into 1kΩ, and 10MHz GBW at 2.2mA per amplifier - making it the optimal choice for high-dynamic-range, low-voltage precision buffering where both noise and output drive are design-critical.
Availability
MAX4477AUA is available at Aetrix Electronics and suitable for medical instrumentation, precision sensor interfaces, and 16-bit data acquisition systems requiring stable component supply across extended temperature ranges (–40°C to +125°C) and long production lifecycles.
Supply support for MAX4477AUA 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) is a semiconductor leader specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX4475–MAX4478 family was designed specifically for precision signal conditioning in noise-sensitive, wide-dynamic-range applications - emphasizing ultra-low distortion, rail-to-rail operation, and ground-sensing capability in compact packages.
FAQ
What is the operating temperature range for the MAX4477AUA?
The MAX4477AUA is specified for operation from –40°C to +125°C, meeting industrial and extended-temperature requirements. This range is validated across all electrical parameters in the datasheet, including input offset voltage, gain-bandwidth product, and output swing - ensuring reliable performance in harsh environments such as automotive engine control units or industrial motor drives where thermal cycling occurs.
Does the MAX4477AUA include a shutdown feature?
No, the MAX4477AUA does not include a shutdown pin. Unlike the MAX4475 or MAX4488 variants, the MAX4477AUA omits the SHDN terminal - confirmed by its pin configuration (no Pin 5 function) and ordering guide. Power management must be implemented externally via supply switching or enable circuitry if low-quiescent-current standby is required in the system design using MAX4477AUA.
What package type is used for the MAX4477AUA?
The MAX4477AUA uses the 8-pin µMAX® package (outline number 21-0036, land pattern 90-0092), identified by package code U8+4. This thermally enhanced, RoHS-compliant package features an exposed paddle connected to VSS, delivering θJA = 206°C/W on multi-layer PCBs - enabling high-density layouts while maintaining thermal safety margins in continuous operation at +125°C ambient.
Can the MAX4477AUA drive capacitive loads?
Yes, the MAX4477AUA is stable driving capacitive loads up to 200pF without oscillation, as verified in the datasheet's AC Electrical Characteristics and Typical Operating Characteristics. This capability supports direct connection to ADC input capacitors, long PCB traces, or downstream filter stages - eliminating the need for isolation resistors in most precision signal chain implementations using MAX4477AUA.
What is the input bias current specification for the MAX4477AUA?
The MAX4477AUA has a maximum input bias current of ±150pA over temperature (–40°C to +125°C), with a typical value of ±1pA at +25°C. This ultra-low IB enables high-impedance sensor interfacing - such as piezoelectric transducers or pH electrodes - without introducing significant voltage errors across feedback networks, preserving accuracy in 16-bit measurement systems using MAX4477AUA.
MAX4477AUA 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:
- 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-uMAX/uSOP
MAX4477AUA FAQ
1.How can I place an order for MAX4477AUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4477AUA 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 MAX4477AUA reliable?
The price and inventory of MAX4477AUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4477AUA is usually 5 days.
3.What payment methods are accepted for MAX4477AUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4477AUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4477AUA?
MAX4477AUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4477AUA 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 MAX4477AUA?
For technical support, including MAX4477AUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4477AUA requirements.
6.How does Aetrix verify that MAX4477AUA is sourced from the original manufacturer or authorized distributors?
All MAX4477AUA 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 MAX4477AUA meets industry standards.
7.What is the process for return or replacement of MAX4477AUA?
All MAX4477AUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4477AUA, 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 MAX4477AUA part is unused and in its original packaging.
Return procedure for MAX4477AUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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