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Analog Devices Inc./Maxim Integrated MAX4478AUD
- Part No.:
- MAX4478AUD
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX4478AUD.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,295
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Product details
Overview
MAX4478AUD from Maxim Integrated is a quad, 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 16-bit ADC buffers and medical sensor front-ends.
For engineers reviewing the MAX4478AUD datasheet, MAX4478AUD pinout, MAX4478AUD application, or MAX4478AUD equivalent, this page provides verified circuit role, package mapping (14-pin TSSOP), thermal performance (θJA = 100.4°C/W multilayer), shutdown capability absence, and design-meaningful parameter context - all extracted from Maxim's official Rev 11 datasheet and ordering guide.
Technical Context
The MAX4478AUD implements a BiCMOS input stage enabling picoampere-level input bias current (±1pA typ) and ground-sensing input common-mode range (down to VSS − 0.1V). Its unity-gain stability and 10MHz GBW support high-fidelity closed-loop configurations without external compensation.
It features true rail-to-rail output swing (within 80mV of rails at 1kΩ load), 120dB large-signal voltage gain, and robust capacitive-load drive up to 200pF - making it suitable for driving SAR ADC inputs and low-impedance transducer interfaces while maintaining DC accuracy across −40°C to +125°C.
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 amplification up to ~1MHz closed-loop bandwidth. |
| Input Voltage-Noise Density | 4.5nV/√Hz @ 1kHz - enables sub-16-bit noise floor preservation in 100kSPS+ data acquisition systems with high-source-impedance sensors. |
| Total Harmonic Distortion + Noise | 0.0002% @ 1kHz, 2VP-P, RL = 1kΩ - ensures minimal spectral contamination in audio-grade and instrumentation signal chains. |
| Supply Voltage Range | +2.7V to +5.5V single supply - compatible with Li-ion, 3.3V, and 5V logic domains without level-shifting circuitry. |
| Input Common-Mode Range | VSS − 0.1V to VDD − 1.7V - allows direct interfacing with grounded transducers and bipolar signals in single-supply systems. |
| Rail-to-Rail Output Swing | Within 80mV of VDD/VSS @ 1kΩ - maximizes dynamic range utilization in low-voltage ADC buffer applications. |
| Quiescent Supply Current | 2.5mA per amplifier @ VDD = 5V - balances performance and power efficiency for multi-channel embedded signal conditioning. |
Pinout & Package
MAX4478AUD is housed in a 14-pin TSSOP package (package code U14+2, outline 21-0066) with exposed thermal pad (not electrically connected), JEDEC-compliant footprint, and RoHS-compliant finish. Thermal resistance is θJA = 100.4°C/W on multilayer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | OUTA, OUTB, OUTC, OUTD | Four independent rail-to-rail output terminals - each drives ≥ ±5mA and settles to 0.01% in 2µs for fast settling ADC interface. |
| 2, 6, 9, 13 | IN−, IN−, IN−, IN− | Inverting inputs - high-impedance (1000GΩ), low-bias-current nodes for precision feedback networks. |
| 3, 5, 10, 12 | IN+, IN+, IN+, IN+ | Noninverting inputs - include ground-sensing capability and guaranteed no phase reversal under overdrive. |
| 4 | VSS | Negative supply terminal - must be connected to system ground for single-supply operation; EP (exposed pad) not present in TSSOP. |
| 11 | VDD | Positive supply terminal - requires local 0.1µF ceramic bypass capacitor for stable high-frequency PSRR (>90dB). |
Key Features
| Feature | Design Value |
|---|---|
| Low input voltage-noise density | 4.5nV/√Hz @ 1kHz - preserves SNR in microphone preamps and strain gauge bridges where source impedance exceeds 1kΩ. |
| Rail-to-rail output with 1kΩ load | Swings within 80mV of VDD/VSS - enables full-scale utilization of 16-bit ADC reference ranges without headroom loss. |
| Unity-gain stable architecture | No external compensation required - simplifies layout and eliminates stability risk in gain = +1 buffer configurations. |
| High open-loop gain | 120dB large-signal voltage gain - ensures <1LSB error in 16-bit systems with typical feedback resistor ratios. |
| Wide temperature range | −40°C to +125°C operation - qualified for automotive cabin and industrial motor-control sensor interfaces. |
Applications
| ADC Buffers | DAC Output Amplifiers |
|---|---|
|
Use Scenario: Driving the unbuffered output of a 16-bit DAC (e.g., MAX5541) into a 10kΩ load with DC accuracy. IC Role / Device Role / Timing Role: Precision output buffer providing low IB (1pA typ), high AVOL (120dB), and rail-to-rail swing to maintain monotonicity and linearity. Use Value: Eliminates DAC output error due to input bias current, enabling true 16-bit accuracy without trimming or calibration. |
Use Scenario: Conditioning analog output from a high-resolution DAC in portable medical devices. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain stage with 2µs 0.01% settling time for fast update rates. Use Value: Maintains THD+N < 0.0002% across audio band, critical for ECG waveform fidelity and diagnostic confidence. |
| Strain Gauges/Sensor Amplifiers | Medical Instrumentation |
|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from load cells in digital scales. IC Role / Device Role / Timing Role: High-input-impedance, low-drift instrumentation amplifier front-end (configured as diff-amp with matched resistors). Use Value: 70µV max VOS and 0.3µV/°C tempco ensure <0.01% full-scale error drift over industrial temperature range. |
Use Scenario: Front-end signal conditioning for EEG/EMG acquisition with high common-mode rejection. IC Role / Device Role / Timing Role: Ground-sensing, rail-to-rail op amp enabling single-supply biopotential amplification with >90dB CMRR. Use Value: Input common-mode range extending below ground rejects electrode offset voltages without AC coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad, rail-to-rail, low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4188AIPW | Zero-drift architecture, 0.03µV/°C VOS drift vs. MAX4478AUD's ±0.3µV/°C; 6.4MHz GBW vs. 10MHz; higher quiescent current (1.1mA/op). | Better DC precision for µV-level sensor offsets; lower bandwidth limits use in >500kHz closed-loop filters. | Select OPA4188AIPW when ultra-low VOS drift dominates over speed and power; avoid if full 10MHz GBW or <2.5mA/op is required. |
| ADA4625-4ACPZ-R7 | Lower input voltage noise (2.9nV/√Hz), higher slew rate (34V/µs), but decompensated (min gain = +5V/V); no unity-gain stability. | Superior noise performance for ultra-low-level signals; incompatible with unity-gain buffers or integrators without modification. | Select ADA4625-4ACPZ-R7 only for gain ≥ +5V/V configurations requiring lowest possible noise; not drop-in for MAX4478AUD's unity-gain use cases. |
Compared with OPA4188AIPW and ADA4625-4ACPZ-R7, the MAX4478AUD uniquely combines unity-gain stability, 10MHz bandwidth, and 4.5nV/√Hz noise in a 14-pin TSSOP - making it optimal for general-purpose, high-fidelity, multi-channel buffering where gain flexibility and ease of use are prioritized over extreme DC precision or ultra-low noise.
Availability
MAX4478AUD is available at Aetrix Electronics and suitable for ADC buffering, medical sensor signal conditioning, and industrial strain gauge amplification requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4478AUD 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 in industrial, automotive, and communications markets.
The MAX4475–MAX4478 family was engineered specifically for wide-dynamic-range, low-noise, rail-to-rail signal conditioning - targeting 16-bit+ data acquisition, medical instrumentation, and high-fidelity sensor interfaces demanding both speed and accuracy.
FAQ
What is the gain-bandwidth product of the MAX4478AUD?
The MAX4478AUD has a gain-bandwidth product of 10MHz and is unity-gain stable. This specification is confirmed in the AC Electrical Characteristics table of the Maxim datasheet (Rev 11, page 5), where GBWP is listed as 10MHz for AV = +1V/V. The value applies directly to the MAX4478AUD as a member of the MAX4475–MAX4478 series, which shares identical small-signal AC performance.
Does the MAX4478AUD feature a shutdown pin?
No, the MAX4478AUD does not include a shutdown (SHDN) function. According to the Selector Guide (page 15) and Pin Description (page 11), SHDN is only available on the MAX4475 and MAX4488 variants. The MAX4478AUD pinout (TSSOP-14) contains four output pins (1,7,8,14), four inverting inputs (2,6,9,13), four noninverting inputs (3,5,10,12), VDD (11), and VSS (4) - with no dedicated SHDN terminal.
What is the maximum capacitive load the MAX4478AUD can drive without oscillation?
The MAX4478AUD is specified to drive capacitive loads up to 200pF without sustained oscillation, as stated in the AC Electrical Characteristics table (page 6) under "Capacitive-Load Stability". This rating holds for unity-gain configurations and is validated across the full −40°C to +125°C operating temperature range, supporting direct connection to ADC input capacitance and long PCB traces.
What package type is used for the MAX4478AUD?
The MAX4478AUD uses a 14-pin TSSOP package (package code U14+2, outline number 21-0066), as confirmed in the Ordering Information table (page 15) and Package Information section (page 3). It features a standard JEDEC footprint, RoHS-compliant finish, and thermal resistance of θJA = 100.4°C/W on multilayer PCB - distinct from SOT23, TDFN, or µMAX variants in the same family.
Is the MAX4478AUD qualified for automotive applications?
The MAX4478AUD itself is not automotive-qualified; however, the automotive-grade variant is explicitly designated as MAX4478AUD/V+ (with /V suffix), as listed in the Ordering Information table (page 15). The standard MAX4478AUD is rated for −40°C to +125°C operation and meets industrial reliability standards, but lacks AEC-Q100 qualification documentation required for automotive ECUs or infotainment systems.
MAX4478AUD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- 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 (x4 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:
- 14-TSSOP
MAX4478AUD FAQ
1.How can I place an order for MAX4478AUD through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4478AUD 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 MAX4478AUD reliable?
The price and inventory of MAX4478AUD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4478AUD is usually 5 days.
3.What payment methods are accepted for MAX4478AUD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4478AUD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4478AUD?
MAX4478AUD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4478AUD 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 MAX4478AUD?
For technical support, including MAX4478AUD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4478AUD requirements.
6.How does Aetrix verify that MAX4478AUD is sourced from the original manufacturer or authorized distributors?
All MAX4478AUD 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 MAX4478AUD meets industry standards.
7.What is the process for return or replacement of MAX4478AUD?
All MAX4478AUD units undergo pre-shipment inspection (PSI). If there is an issue with MAX4478AUD, 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 MAX4478AUD part is unused and in its original packaging.
Return procedure for MAX4478AUD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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