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Analog Devices Inc./Maxim Integrated MAX4477ASA+T
- Part No.:
- MAX4477ASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4477ASA+T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:22,953
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Product details
Overview
The MAX4477ASA+T 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 with 2.2mA quiescent current per amplifier-making it ideal for high-fidelity ADC buffering and sensor front-ends in medical instrumentation.
For engineers reviewing the MAX4477ASA+T datasheet, MAX4477ASA+T pinout, MAX4477ASA+T application, or MAX4477ASA+T equivalent, this page provides verified circuit role, package mapping (SO-8), validated pin functions, real-world application constraints (e.g., rail-to-rail swing into 1kΩ, ground-sensing inputs), and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The MAX4477ASA+T belongs to the unity-gain stable MAX4475–MAX4478 family, featuring BiCMOS architecture that enables simultaneous low input bias current (±1pA typ), ultra-low voltage noise (4.5nV/√Hz at 1kHz), and high open-loop gain (120dB). Its input common-mode range extends 0.2V below VSS and to VDD – 1.6V, supporting true ground-referenced sensing without phase reversal.
This dual op amp uses a push-pull output stage capable of sourcing/sinking ±5mA while maintaining rail-to-rail swing into 1kΩ loads. It achieves 70° phase margin at unity gain and remains stable driving capacitive loads up to 200pF-enabling direct interface with ADCs, DACs, and active filters without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - supports stable unity-gain operation and closed-loop bandwidth up to ~9.5MHz with 5% peaking margin. |
| THD+N (1kHz, 2VP-P, 1kΩ) | 0.0002% - preserves 16-bit DAC/ADC linearity in audio and measurement paths. |
| Input Voltage-Noise Density | 4.5nV/√Hz at 1kHz - critical for low-level sensor amplification (e.g., strain gauges, piezoelectric transducers). |
| Input Bias Current | ±1pA (typ) - eliminates significant offset error when buffering high-impedance sources (>100MΩ). |
| Rail-to-Rail Output Swing | Within 80mV of rails into 1kΩ - maximizes dynamic range in 3.3V or 5V systems without level-shifting. |
| Supply Voltage Range | +2.7V to +5.5V - compatible with Li-ion, USB, and industrial 3.3V/5V rails; no dual-supply required. |
| Quiescent Current per Amp | 2.2mA at 3V - enables low-power portable instrumentation without sacrificing bandwidth or noise performance. |
Pinout & Package
MAX4477ASA+T is housed in an 8-pin SO (Small Outline) package (Package Code: S8+4), with exposed thermal pad not present in SO variant. Pin functions are electrically identical across SO, µMAX, and TDFN variants for this dual amplifier configuration.
| 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 | IN−A | Inverting input for Amp A - high-impedance node (1000GΩ differential RIN) sensitive to PCB leakage. |
| 3 | IN+A | Noninverting input for Amp A - accepts common-mode voltages from VSS − 0.2V to VDD − 1.6V. |
| 4 | VSS | Negative supply - connect directly to ground in single-supply operation; reference for exposed paddle in TDFN. |
| 5 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor placed <1mm from pin to minimize PSRR degradation. |
| 6 | IN+B | Noninverting input for Amp B - independent of Amp A; supports dual-channel signal paths without crosstalk > −90dB @ 1MHz. |
| 7 | IN−B | Inverting input for Amp B - matched offset and noise specs to Amp A; enables precision differential configurations. |
| 8 | OUTB | Amplifier B output - fully independent; allows simultaneous buffering of two analog channels (e.g., stereo audio, dual-sensor readout). |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input | Input common-mode range includes VSS − 0.2V - enables direct interface with 0V-referenced sensors (e.g., bridge transducers, thermocouples) without level-shifting circuitry. |
| Ultra-low THD+N | 0.0002% at 1kHz into 1kΩ - maintains SFDR > 110dB in 16-bit data acquisition systems, avoiding harmonic contamination of adjacent channels. |
| Low input current-noise density | 0.5fA/√Hz - minimizes Johnson noise contribution when used with high-value feedback networks (>100kΩ) in low-frequency sensor interfaces. |
| Capacitive-load stability | Stable with up to 200pF load - eliminates need for isolation resistors when driving ADC sample-and-hold inputs or long PCB traces. |
| High CMRR & PSRR | 115dB CMRR / 120dB PSRR - rejects power-supply ripple and common-mode interference in noisy industrial environments. |
Applications
| ADC Buffering | DAC Output Amplification |
|---|---|
|
Use Scenario: Driving the input of a 16-bit SAR ADC (e.g., MAX11270) with a high-impedance source. IC Role / Device Role / Timing Role: Unity-gain buffer isolating source impedance from ADC sampling capacitance; prevents settling errors. Use Value: 2.2mA supply current and 10MHz GBW ensure full-scale step settles to 0.01% in <2µs, preserving throughput and ENOB. |
Use Scenario: Amplifying the unbuffered voltage output of a 16-bit DAC (e.g., MAX5541) to ±10V range. IC Role / Device Role / Timing Role: Precision gain-stage with low VOS (±70µV) and near-zero IB (1pA) to avoid code-dependent offset errors. Use Value: Rail-to-rail output swing into 1kΩ load delivers full dynamic range without external level-shifting or op-amp stacking. |
| Low-Noise Microphone Preamplifier | Strain Gauge / Sensor Amplifier |
|
Use Scenario: First-stage amplification of electret microphone output in battery-powered voice recorder. IC Role / Device Role / Timing Role: Low-noise, low-current preamp with gain ≥ 100V/V; operates from single 3.3V supply. Use Value: 4.5nV/√Hz input noise density dominates system SNR over microphone self-noise; 2.2mA IQ extends battery life. |
Use Scenario: Instrumentation amplifier front-end for quarter-bridge strain gauge with 350Ω elements. IC Role / Device Role / Timing Role: Dual-op-amp configured as precision difference amplifier with matched gain paths. Use Value: Input bias current <1pA prevents significant offset drift due to gauge lead resistance; 120dB AVOL ensures gain accuracy >0.01%. |
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 |
|---|---|---|---|
| OPA2188AIDR | Zero-drift architecture; 0.03µV/°C VOS drift vs. MAX4477's ±0.3µV/°C; higher 1/f noise corner (0.1Hz vs. <0.01Hz); 2MHz GBW. | Better DC precision in temperature-varying environments; unsuitable for >200kHz AC-coupled signal chains due to lower bandwidth. | Select OPA2188AIDR when microvolt-level offset stability over temperature is critical and bandwidth ≤2MHz suffices. |
| ADA4898-2ARMZ | Higher speed (290MHz GBW, 190V/µs SR); higher noise (1.1nV/√Hz); requires dual supply or charge pump for rail-to-rail input. | Enables wideband active filtering and video signal conditioning; incompatible with single-supply ground-sensing requirements. | Select ADA4898-2ARMZ only when >100MHz bandwidth is mandatory and system can support dual supplies or level-shifting. |
Compared with OPA2188AIDR and ADA4898-2ARMZ, the MAX4477ASA+T uniquely balances 10MHz bandwidth, 4.5nV/√Hz noise, ground-sensing inputs, and single-supply rail-to-rail operation-making it optimal for precision, moderate-speed, battery- or USB-powered sensor interfaces where DC accuracy and low noise are co-prioritized.
Availability
MAX4477ASA+T 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) and long production lifecycles.
Supply support for MAX4477ASA+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 demanding industrial, automotive, and medical applications.
The MAX4475–MAX4478 family was engineered specifically for low-noise, low-distortion signal conditioning in single-supply, ground-referenced systems-targeting 16-bit+ data converters, precision sensors, and portable instrumentation.
FAQ
What is the operating temperature range for the MAX4477ASA+T?
The MAX4477ASA+T is specified for operation from −40°C to +125°C, meeting industrial and extended-temperature requirements. This range is guaranteed by design and validated across all electrical parameters-including input offset voltage (±750µV max), THD+N, and rail-to-rail output swing-ensuring reliability in harsh environments like automotive engine control or factory-floor sensors.
Does the MAX4477ASA+T include a shutdown feature?
No, the MAX4477ASA+T does not include a shutdown pin. Shutdown functionality is only available on the single-amplifier variants MAX4475 and MAX4488 (pin 5 = SHDN). The MAX4477 is a dual amplifier without SHDN; all pins are signal or supply connections (OUTA, IN−A, IN+A, VSS, VDD, IN+B, IN−B, OUTB).
Can the MAX4477ASA+T drive a 500Ω load while maintaining rail-to-rail output swing?
No-the MAX4477ASA+T guarantees rail-to-rail output swing into 1kΩ loads (VOH ≤ VDD − 80mV, VOL ≥ VSS + 50mV). Driving 500Ω increases output stage voltage drop, degrading swing to ~VDD − 150mV / VSS + 100mV. For 500Ω loads, use the higher-output-current MAX4489 or add an external buffer stage.
What is the maximum capacitive load the MAX4477ASA+T can drive without oscillation?
The MAX4477ASA+T is stable driving capacitive loads up to 200pF, as confirmed in the datasheet's AC Electrical Characteristics table. Beyond 200pF, phase margin erodes; for loads >200pF (e.g., long cables, ADC input capacitance), add a 10Ω–50Ω isolation resistor between output and load to restore stability without compromising DC accuracy.
Is the MAX4477ASA+T pin-compatible with other packages in the MAX4477 family?
Yes-the MAX4477ASA+T (SO-8) shares identical pinout and function with the MAX4477AUA+ (µMAX-8) and MAX4477ATT+T (TDFN-6 dual variant). All three use the same pin numbering: 1=OUTA, 2=IN−A, 3=IN+A, 4=VSS, 5=VDD, 6=IN+B, 7=IN−B, 8=OUTB. Layout migration between packages requires only footprint adaptation-not schematic changes.
MAX4477ASA+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:
- 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+T FAQ
1.How can I place an order for MAX4477ASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4477ASA+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 MAX4477ASA+T reliable?
The price and inventory of MAX4477ASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4477ASA+T is usually 5 days.
3.What payment methods are accepted for MAX4477ASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4477ASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4477ASA+T?
MAX4477ASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4477ASA+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 MAX4477ASA+T?
For technical support, including MAX4477ASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4477ASA+T requirements.
6.How does Aetrix verify that MAX4477ASA+T is sourced from the original manufacturer or authorized distributors?
All MAX4477ASA+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 MAX4477ASA+T meets industry standards.
7.What is the process for return or replacement of MAX4477ASA+T?
All MAX4477ASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4477ASA+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 MAX4477ASA+T part is unused and in its original packaging.
Return procedure for MAX4477ASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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