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Analog Devices Inc./Maxim Integrated MAX4477AUA-T
- Part No.:
- MAX4477AUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4477AUA-T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,979
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Product details
Overview
MAX4477AUA-T from Maxim Integrated is a dual, rail-to-rail output, low-noise, low-distortion operational amplifier optimized for precision signal conditioning in 16-bit ADC/DAC interfaces and sensor front-ends. It delivers 10MHz gain-bandwidth, 0.0002% THD+N at 1kHz (1kΩ load), 4.5nV/√Hz input voltage-noise density, and operates from +2.7V to +5.5V single supply with 2.2mA per amplifier quiescent current.
For engineers reviewing the MAX4477AUA-T datasheet, MAX4477AUA-T pinout, MAX4477AUA-T application, or MAX4477AUA-T equivalent, this page provides verified circuit role, package mapping (8-pin µMAX), shutdown absence, unity-gain stability, and design-meaningful noise/distortion tradeoffs for medical instrumentation, strain gauge amplification, and high-resolution data acquisition systems.
Technical Context
The MAX4477AUA-T belongs to the MAX4475–MAX4478 family - unity-gain stable, internally compensated op amps with 10MHz GBW and rail-to-rail output swing within 80mV of supplies (1kΩ load). Its input common-mode range extends to ground and −0.1V below VSS, enabling true ground-sensing operation without phase reversal under overdrive.
It features ultra-low input bias current (±1pA typ), 70µV max input offset voltage, and 120dB large-signal voltage gain - critical for maintaining DC accuracy in high-impedance sensor interfaces such as piezoelectric transducers and digital scales. 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 gain ≥1V/V up to 10MHz; enables anti-aliasing filter design to 100kHz with margin. |
| THD+N | 0.0002% at 1kHz, 2VP-P, 1kΩ load - preserves signal fidelity in 16-bit DAC buffer and audio-grade preamplifier applications. |
| Input Voltage-Noise Density | 4.5nV/√Hz at 1kHz - minimizes added noise in low-level sensor signals (e.g., strain gauges, microphones). |
| Input Bias Current | ±1pA typical - prevents significant voltage error across high-impedance sources (>100MΩ), essential for piezoelectric and pH sensor interfaces. |
| Rail-to-Rail Output Swing | Within 80mV of VDD/VSS at 1kΩ load - maximizes dynamic range in low-voltage (2.7V) systems without level-shifting. |
| Supply Voltage Range | +2.7V to +5.5V single supply - compatible with Li-ion, USB, and industrial 3.3V/5V rails without dual-supply complexity. |
| Operating Temperature | −40°C to +125°C - qualified for automotive cabin electronics and industrial embedded environments. |
Pinout & Package
MAX4477AUA-T is housed in an 8-pin µMAX® package (package code U8+4), featuring exposed pad (EP) connected to VSS for thermal performance. The device contains two independent amplifiers with shared power pins.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives loads down to 1kΩ while maintaining rail-to-rail swing and DC accuracy. |
| 2 | INA− | Inverting input of Amplifier A - high-impedance node; layout sensitivity requires guard ring and short trace routing. |
| 3 | INA+ | Noninverting input of Amplifier A - accepts common-mode voltages from ground to VDD − 1.6V; enables ground-referenced sensor inputs. |
| 4 | VSS | Negative supply - connect directly to system ground; EP must be soldered to VSS plane for thermal reliability. |
| 5 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor placed <5mm from pin to minimize PSRR degradation. |
| 6 | INB+ | Noninverting input of Amplifier B - electrically isolated from Amplifier A; supports differential or dual-channel signal paths. |
| 7 | INB− | Inverting input of Amplifier B - matched to INA− for common-mode rejection in dual-op-amp configurations. |
| 8 | OUTB | Amplifier B output - identical AC/DC performance to OUTA; enables dual-buffer or fully differential output stages. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output with 1kΩ load | Maintains full output swing and linearity in low-voltage systems - eliminates need for external level shifters in 3.3V data acquisition. |
| Input common-mode range includes ground | Enables direct connection of unipolar sensors (e.g., thermistors, RTDs) without input biasing networks. |
| 0.0002% THD+N at 1kHz | Preserves harmonic integrity in 16-bit DAC reconstruction and medical ECG/EEG signal chains. |
| 4.5nV/√Hz input voltage noise | Reduces integrated noise floor in bandwidth-limited sensor amplifiers - critical for sub-µV signal resolution. |
| 10MHz unity-gain bandwidth | Supports fast-settling (2µs to 0.01%) in multiplexed data acquisition and active filter designs up to 100kHz. |
Applications
| ADC Buffers | DAC Output Amplifiers |
|---|---|
Use Scenario: Buffering the unbuffered voltage output of a 16-bit DAC (e.g., MAX5541) into a low-impedance load. IC Role / Device Role / Timing Role: Precision voltage follower with <150pA input bias current to prevent code-dependent errors and maintain monotonicity. Use Value: Eliminates DAC output loading error and preserves 16-bit INL/DNL specifications across full temperature range. | Use Scenario: Driving analog inputs of successive-approximation ADCs with high source impedance and strict settling requirements. IC Role / Device Role / Timing Role: High-speed, low-noise gain stage preceding SAR ADC sampling aperture. Use Value: Achieves 2µs settling to 0.01% with rail-to-rail swing, enabling >500ksps throughput without pipeline latency. |
| Strain Gauges/Sensor Amplifiers | Medical Instrumentation |
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from load cells or pressure sensors. IC Role / Device Role / Timing Role: Low-drift, low-noise instrumentation amplifier front-end (used in 3-op-amp configuration or as first-stage gain block). Use Value: 70µV max VOS and ±0.3µV/°C tempco ensure <0.01% FS error drift over −40°C to +85°C. | Use Scenario: Signal conditioning in portable ECG monitors requiring ultra-low noise and DC accuracy. IC Role / Device Role / Timing Role: Low-noise, high-CMRR preamplifier for biopotential electrode inputs. Use Value: 115dB CMRR and 4.5nV/√Hz noise enable clean extraction of 10µV cardiac signals amid 60Hz interference. |
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 |
|---|---|---|---|
| OPA2333AIDR | Zero-drift architecture; 0.1µV/°C VOS drift vs. MAX4477AUA-T's ±0.3µV/°C; lower 1/f noise but higher 4.9nV/√Hz broadband noise. | Better for DC-critical applications (e.g., precision weigh scales); less optimal for wideband sensor signals above 10kHz. | Select OPA2333AIDR when long-term VOS stability dominates over wideband THD+N. |
| AD8602ARMZ | Lower quiescent current (1mA vs. 2.2mA); 5.2nV/√Hz noise; 8MHz GBW; no guaranteed rail-to-rail output swing into 1kΩ. | Suitable for battery-powered portable instruments where power budget is tighter than noise floor. | Select AD8602ARMZ only if load impedance ≥10kΩ and full rail-to-rail swing is not required. |
Compared with OPA2333AIDR and AD8602ARMZ, the MAX4477AUA-T uniquely balances 10MHz bandwidth, 0.0002% THD+N, and rail-to-rail drive into 1kΩ - making it the preferred choice for high-fidelity, wide-dynamic-range data acquisition where both speed and distortion matter.
Availability
MAX4477AUA-T is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor interfaces, and high-resolution data acquisition systems requiring stable component supply, extended temperature qualification (−40°C to +125°C), and RoHS-compliant packaging.
Supply support for MAX4477AUA-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 precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and automotive applications.
The MAX4475–MAX4478 family was engineered specifically for high-fidelity signal conditioning in 16-bit+ data converters and low-noise sensor front-ends - emphasizing rail-to-rail operation, ground-sensing inputs, and ultra-low THD+N.
FAQ
What is the gain-bandwidth product of the MAX4477AUA-T?
The MAX4477AUA-T has a gain-bandwidth product of 10MHz and is unity-gain stable. This allows stable closed-loop operation at gains ≥1V/V up to 10MHz, supporting high-speed filtering and fast-settling applications. The specification is measured at AV = +1V/V with VDD = +5V and TA = +25°C, and remains consistent across the full −40°C to +125°C operating range.
Does the MAX4477AUA-T include a shutdown pin?
No, the MAX4477AUA-T does not feature a shutdown pin. Unlike the MAX4475 or MAX4488 variants, this dual op amp lacks SHDN functionality. Power control must be implemented externally via supply sequencing or enable circuitry. The pinout confirms pins 1–8 are assigned exclusively to OUTA, INA−, INA+, VSS, VDD, INB+, INB−, and OUTB - with no dedicated shutdown terminal.
What package type is used for the MAX4477AUA-T?
The MAX4477AUA-T uses the 8-pin µMAX® package (outline number 21-0036, package code U8+4), which includes an exposed thermal pad (EP) that must be soldered to the VSS plane. This compact 3mm × 3mm package supports high-density PCB layouts while delivering superior thermal performance (θJA = 206°C/W on multilayer board) compared to SO-8 alternatives.
Can the MAX4477AUA-T drive a 1kΩ load rail-to-rail?
Yes, the MAX4477AUA-T is specified to deliver rail-to-rail output swing into a 1kΩ load - within 80mV of VDD and VSS at VDD = +5V. This capability is confirmed in the DC Electrical Characteristics table and validated across temperature (−40°C to +125°C). It enables direct interfacing with low-impedance ADC inputs or transmission lines without external buffers.
What is the input voltage-noise density of the MAX4477AUA-T at 1kHz?
The MAX4477AUA-T exhibits an input voltage-noise density of 4.5nV/√Hz at 1kHz, as specified in the AC Electrical Characteristics table. This value is representative of its broadband thermal noise floor and is critical for minimizing added noise in low-level sensor amplification - especially in strain gauge, microphone, and medical biopotential applications where signal amplitudes are sub-millivolt.
MAX4477AUA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for MAX4477AUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4477AUA-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 MAX4477AUA-T reliable?
The price and inventory of MAX4477AUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4477AUA-T is usually 5 days.
3.What payment methods are accepted for MAX4477AUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4477AUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4477AUA-T?
MAX4477AUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4477AUA-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 MAX4477AUA-T?
For technical support, including MAX4477AUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4477AUA-T requirements.
6.How does Aetrix verify that MAX4477AUA-T is sourced from the original manufacturer or authorized distributors?
All MAX4477AUA-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 MAX4477AUA-T meets industry standards.
7.What is the process for return or replacement of MAX4477AUA-T?
All MAX4477AUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4477AUA-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 MAX4477AUA-T part is unused and in its original packaging.
Return procedure for MAX4477AUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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