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Analog Devices Inc./Maxim Integrated MAX4478ASD+
- Part No.:
- MAX4478ASD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4478ASD+.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:433
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Product details
Overview
The MAX4478ASD+ from Maxim Integrated is a quad, 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, ±70µV input offset voltage (typ), and operates from +2.7V to +5.5V single supply with 2.2mA per amplifier quiescent current.
For engineers reviewing the MAX4478ASD+ datasheet, MAX4478ASD+ pinout, MAX4478ASD+ application, or MAX4478ASD+ equivalent, this page provides verified circuit role, package mapping (SO-14), pin-validated terminal functions, real-world application constraints (e.g., 200pF capacitive-load stability), and two confirmed alternative op amps with documented functional trade-offs.
Technical Context
The MAX4478ASD+ belongs to the unity-gain stable MAX4475–MAX4478 family, featuring BiCMOS architecture that enables simultaneous rail-to-rail output swing (within 80mV of rails at 1kΩ), ground-sensing input common-mode range (down to VSS − 0.1V), and no phase reversal under overdrive. Its 10MHz GBW and 3V/µs slew rate support high-fidelity buffering up to ~400kHz full-power bandwidth.
It integrates four independent amplifiers in one SO-14 package, each with matched DC performance (±750µV max VOS over −40°C to +125°C) and low input bias current (±150pA max). Unlike the MAX4488/MAX4489 variants, it lacks shutdown functionality and is not internally compensated for gains ≥ +5V/V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - supports stable unity-gain operation and closed-loop bandwidth up to ~10MHz for high-frequency signal conditioning. |
| THD+N (1kHz, 2VP-P, 1kΩ) | 0.0002% - enables 16-bit DAC/ADC interface without introducing measurable harmonic distortion. |
| Input Voltage-Noise Density | 4.5nV/√Hz at 1kHz - preserves SNR in low-level sensor amplification (e.g., strain gauges, piezoelectric transducers). |
| Input Offset Voltage (TA = +25°C) | ±70µV (typ) - ensures <0.1 LSB error in 16-bit systems with 5V full-scale range. |
| Supply Voltage Range | +2.7V to +5.5V - compatible with Li-ion, 3.3V, and 5V logic domains without level-shifting. |
| Rail-to-Rail Output Swing | Within 80mV of VDD/VSS at 1kΩ load - maximizes dynamic range in low-voltage systems. |
| Quiescent Current per Amp | 2.2mA at VDD = 3V - balances low-noise performance with moderate power consumption for multi-amp designs. |
Pinout & Package
MAX4478ASD+ uses a 14-pin SO (Small Outline) package (Package Code S14+4, Outline Number 21-0041), with exposed pad not present. Thermal resistance θJA is 84°C/W on multilayer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives external load; rail-to-rail capable with ≤200pF capacitive stability. |
| 2 | INA− | Inverting input of Amp A - high-impedance node; requires matched layout to INA+ to minimize CMRR degradation. |
| 3 | INA+ | Noninverting input of Amp A - accepts signals down to VSS − 0.1V; critical for ground-referenced sensor interfaces. |
| 4 | VSS | Negative supply - connect directly to system ground in single-supply operation; reference for all inputs/outputs. |
| 5 | INB+ | Noninverting input of Amp B - electrically identical to INA+; used for dual-channel differential sensing. |
| 6 | INB− | Inverting input of Amp B - paired with INB+; maintains same noise/distortion specs as channel A. |
| 7 | OUTB | Amplifier B output - independent of OUTA; supports dual-channel buffer or instrumentation amp configurations. |
| 8 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor close to pin to suppress supply noise coupling. |
| 9 | INC− | Inverting input of Amp C - shares same BiCMOS input stage characteristics; supports third analog channel. |
| 10 | INC+ | Noninverting input of Amp C - extends ground-sensing capability to third channel for multi-sensor systems. |
| 11 | OUTC | Amplifier C output - enables three independent buffered paths (e.g., triple ADC input channels). |
| 12 | IND+ | Noninverting input of Amp D - completes quad configuration; suitable for reference buffer or fourth sensor path. |
| 13 | IND− | Inverting input of Amp D - matches input impedance and noise performance of other channels. |
| 14 | OUTD | Amplifier D output - provides fourth rail-to-rail output; allows full quad-channel signal conditioning in one SO-14 IC. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal under overdrive | Guaranteed behavior prevents latch-up or signal inversion when inputs exceed common-mode range - essential for fault-tolerant sensor interfaces. |
| Capacitive-load stability up to 200pF | Enables direct driving of ADC input capacitance or long PCB traces without external compensation networks. |
| Input common-mode range includes ground | Supports true single-supply operation with 0V-referenced transducers (e.g., thermocouples, bridge sensors) without level-shifting circuitry. |
| Low input bias current (1pA typ) | Minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiodes), preserving accuracy in precision measurement. |
| 120dB large-signal voltage gain | Ensures <1ppm gain error in closed-loop configurations - critical for high-resolution data acquisition linearity. |
Applications
| ADC Buffering | DAC Output Amplification |
|---|---|
|
Use Scenario: Driving the unbuffered voltage output of a 16-bit DAC (e.g., MAX5541) into a variable load. IC Role / Device Role / Timing Role: Precision output buffer with rail-to-rail swing and ultra-low THD+N to preserve DAC resolution. Use Value: Eliminates gain/offset errors from DAC output impedance; 0.0002% THD+N prevents harmonic contamination of analog output. |
Use Scenario: Conditioning the analog output of a 16-bit DAC before feeding to an actuator or filter. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain stage with ground-sensing inputs for bipolar signal reconstruction. Use Value: 4.5nV/√Hz input noise and ±70µV VOS ensure <0.1 LSB total error across full temperature range. |
| Strain Gauge Signal Conditioning | Medical Instrumentation Front-End |
|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from load cells or pressure sensors. IC Role / Device Role / Timing Role: Instrumentation-grade preamplifier with matched quad channels for multi-bridge configurations. Use Value: 10MHz GBW supports fast transient response; 0.5fA/√Hz current noise avoids degradation from high-impedance bridge elements. |
Use Scenario: Biopotential signal amplification (ECG, EEG) requiring high CMRR and low 1/f noise. IC Role / Device Role / Timing Role: First-stage gain block with rail-to-rail output and no phase reversal for patient safety compliance. Use Value: Input common-mode range extending below ground enables AC-coupled electrode interfaces; 260nVP-P 0.1–10Hz noise meets IEC 60601-2-27 requirements. |
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. MAX4478ASD+'s ±6µV/°C; lower 1/f noise but 6MHz GBW. | Better DC stability for long-duration measurements; less suitable for >100kHz signal chains due to lower bandwidth. | Select OPA2188AIDR when ultra-low drift dominates over bandwidth; MAX4478ASD+ preferred for wideband sensor excitation or audio-path buffering. |
| AD8604ARUZ | Quad rail-to-rail op amp; 8MHz GBW, 5.25nV/√Hz noise, no guaranteed phase-reversal immunity. | Lower cost and wider availability; lacks explicit overdrive phase-reversal guarantee and 200pF capacitive-load stability spec. | Choose AD8604ARUZ for cost-sensitive industrial controls; MAX4478ASD+ remains superior for medical or test equipment demanding robust fault behavior. |
Compared with OPA2188AIDR and AD8604ARUZ, the MAX4478ASD+ uniquely combines 10MHz bandwidth, guaranteed no-phase-reversal operation, and 200pF capacitive-load stability - making it the only option among the three qualified for high-fidelity, fault-resilient, multi-channel analog front-ends in safety-critical systems.
Availability
MAX4478ASD+ is available at Aetrix Electronics and suitable for precision data acquisition, medical instrumentation, and industrial sensor interface applications requiring stable component supply, extended temperature operation (−40°C to +125°C), and RoHS-compliant packaging.
Supply support for MAX4478ASD+ 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and medical applications.
The MAX4475–MAX4478 family was engineered specifically for low-noise, low-distortion signal conditioning in 16-bit+ data conversion systems - emphasizing rail-to-rail operation, ground-sensing inputs, and robust overdrive behavior.
FAQ
What is the operating temperature range for the MAX4478ASD+?
The MAX4478ASD+ is specified for continuous operation from −40°C to +125°C. This extended range is validated across all key parameters including input offset voltage (±750µV max), THD+N, and rail-to-rail output swing - making it suitable for under-hood automotive and industrial environments where thermal stress is critical. The junction temperature limit is +150°C.
Does the MAX4478ASD+ include a shutdown feature?
No, the MAX4478ASD+ does not include a shutdown function. Shutdown capability is exclusive to the MAX4475 and MAX4488 variants (pin 5 = SHDN). The MAX4478ASD+ has no SHDN pin; all four amplifiers remain active whenever VDD and VSS are powered. This simplifies design for always-on signal chains but excludes ultra-low-power sleep modes.
Can the MAX4478ASD+ drive a 1000pF capacitive load?
The MAX4478ASD+ is guaranteed stable with capacitive loads up to 200pF. Driving 1000pF will likely cause oscillation or degraded settling time. For heavier loads, external isolation (e.g., series resistor + feedback capacitor) or a dedicated buffer amplifier is required. The 200pF limit is measured per amplifier channel and applies regardless of supply voltage or gain configuration.
What is the maximum supply voltage rating for the MAX4478ASD+?
The absolute maximum supply voltage for the MAX4478ASD+ is +6.0V between VDD and VSS. However, the recommended operating range is +2.7V to +5.5V. Operation above +5.5V voids parametric guarantees and risks permanent damage. The device's internal ESD protection and BiCMOS process are optimized for the 2.7–5.5V window, where all specifications - including THD+N and noise - are fully characterized.
Is the MAX4478ASD+ pin-compatible with other devices in the MAX447x family?
The MAX4478ASD+ (SO-14) is not pin-compatible with the SOT23-6 or TDFN-6 variants (e.g., MAX4475AUT+T), nor with µMAX-8 packages. Its 14-pin SO footprint is unique within the family for quad-channel versions. Pin mapping follows the standard SO-14 layout shown in the datasheet Figure "MAX4478 - SO/TSSOP Top View", with dedicated pins for all four amplifiers' inputs and outputs - unlike dual or single variants that share package pins.
MAX4478ASD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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-SOIC
MAX4478ASD+ FAQ
1.How can I place an order for MAX4478ASD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4478ASD+ 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 MAX4478ASD+ reliable?
The price and inventory of MAX4478ASD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4478ASD+ is usually 5 days.
3.What payment methods are accepted for MAX4478ASD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4478ASD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4478ASD+?
MAX4478ASD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4478ASD+ 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 MAX4478ASD+?
For technical support, including MAX4478ASD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4478ASD+ requirements.
6.How does Aetrix verify that MAX4478ASD+ is sourced from the original manufacturer or authorized distributors?
All MAX4478ASD+ 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 MAX4478ASD+ meets industry standards.
7.What is the process for return or replacement of MAX4478ASD+?
All MAX4478ASD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4478ASD+, 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 MAX4478ASD+ part is unused and in its original packaging.
Return procedure for MAX4478ASD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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