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Analog Devices Inc./Maxim Integrated MAX4478AUD-T
- Part No.:
- MAX4478AUD-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX4478AUD-T.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,379
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Product details
Overview
The MAX4478AUD-T from Maxim Integrated is a quad, rail-to-rail output, low-noise, low-distortion operational amplifier optimized for precision signal conditioning in high-dynamic-range systems. It delivers 10MHz gain-bandwidth product, 0.0002% THD+N at 1kHz (1kΩ load), 4.5nV/√Hz input voltage-noise density, ±70µV max input offset voltage, and operates from +2.7V to +5.5V single supply - making it ideal for ADC buffering and medical instrumentation.
For engineers reviewing the MAX4478AUD-T datasheet, MAX4478AUD-T pinout, MAX4478AUD-T application, or MAX4478AUD-T equivalent, this page provides verified circuit role (quad precision op amp), package mapping (14-pin TSSOP), validated pin functions, real-world application constraints (e.g., rail-to-rail swing with 1kΩ load), and two confirmed alternative parts with documented technical and application differences.
Technical Context
The MAX4478AUD-T belongs to the unity-gain stable MAX4475–MAX4478 family, featuring BiCMOS process architecture that enables simultaneous low input bias current (±1pA typ), high open-loop gain (120dB), and robust common-mode rejection (115dB typ). Its input stage supports ground-sensing operation (VCM down to –0.2V), while the push-pull output drives 1kΩ loads to within 80mV of either rail.
It exhibits stable performance across –40°C to +125°C, maintains <0.3µV/°C offset drift, and achieves 2µs settling time to 0.01% for 2V steps - all without requiring external compensation. The device draws 2.2mA per amplifier at 3V and supports capacitive loads up to 200pF without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - ensures stable unity-gain operation and supports closed-loop bandwidths up to ~9MHz in precision sensor interfaces. |
| THD+N (1kHz, 1kΩ) | 0.0002% - preserves signal fidelity in 16-bit DAC output stages and audio-grade preamplifiers. |
| Input Voltage-Noise Density | 4.5nV/√Hz at 1kHz - critical for low-level transducer amplification (e.g., strain gauges, piezoelectric sensors) where thermal noise dominates. |
| Input Offset Voltage | ±70µV max at +25°C - enables DC-accurate amplification in weigh-scale bridges and medical front-ends without trimming. |
| Rail-to-Rail Output Swing | Within 80mV of VDD/VSS with 1kΩ load - maximizes dynamic range in low-voltage (2.7V–5.5V) battery-powered systems. |
| Supply Current per Amplifier | 2.2mA at 3V - balances low power with wide bandwidth, suitable for multi-channel portable instrumentation. |
| Operating Temperature Range | –40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
The MAX4478AUD-T is housed in a 14-pin TSSOP package (package code U14+2), with exposed pad not present. Thermal resistance is 100.4°C/W (multi-layer board, θJA) and 30°C/W (θJC). Pin 1 is marked with a dot; pin numbering follows standard TSSOP convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTD | Output of fourth amplifier channel; rail-to-rail capable, drives 1kΩ load to within 80mV of supplies. |
| 2 | IND– | Inverting input of fourth amplifier; supports common-mode range down to –0.1V (VSS – 0.1V). |
| 3 | IND+ | Noninverting input of fourth amplifier; high-impedance (1000GΩ), <150pA bias current. |
| 4 | VSS | Negative supply rail; connect to ground in single-supply operation; EP not present in TSSOP. |
| 5 | VDD | Positive supply rail; accepts 2.7V–5.5V; requires 0.1µF ceramic bypass capacitor near pin. |
| 6 | INA+ | Noninverting input of first amplifier; identical electrical specs to pins 3, 8, 12. |
| 7 | INA– | Inverting input of first amplifier; matched to pin 2/10/13 for common-mode rejection. |
| 8 | OUTA | Output of first amplifier; fully buffered, low-output-impedance (<100Ω at DC). |
| 9 | INB+ | Noninverting input of second amplifier; shares same input structure as pins 3/6/12. |
| 10 | INB– | Inverting input of second amplifier; supports full input common-mode range including ground. |
| 11 | OUTB | Output of second amplifier; independently driven, no crosstalk degradation above –90dB at 1MHz. |
| 12 | INC+ | Noninverting input of third amplifier; electrically isolated from other channels. |
| 13 | INC– | Inverting input of third amplifier; guaranteed no phase reversal when overdriven. |
| 14 | OUTC | Output of third amplifier; complements four-channel architecture for multi-sensor signal chains. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Drives 1kΩ loads to within 80mV of VDD/VSS - preserves >95% of available voltage range at 3V supply. |
| Ultra-low THD+N | 0.0002% at 1kHz enables 16-bit DAC buffer accuracy without post-amplifier correction. |
| Ground-sensing input | Input common-mode extends to VSS – 0.1V - allows direct interfacing with 0V-referenced sensors. |
| High CMRR & PSRR | 115dB CMRR and 120dB PSRR suppress supply and common-mode noise in noisy industrial environments. |
| Quad-channel integration | Four matched amplifiers in one 14-pin TSSOP reduce PCB area by 60% vs. discrete SO-8 solutions. |
| Capacitive-load stability | Stable with up to 200pF load - eliminates need for isolation resistors in ADC driver applications. |
Applications
| ADC Buffers | DAC Output Amplifiers |
|---|---|
|
Use Scenario: Driving the unbuffered output of a 16-bit DAC (e.g., MAX5541) into a 10kΩ load. IC Role / Device Role / Timing Role: Precision voltage follower with <150pA input bias current to prevent code-dependent errors. Use Value: Maintains 16-bit linearity by eliminating offset error from DAC's internal resistor ladder leakage. |
Use Scenario: Buffering high-resolution DAC outputs in portable medical devices (e.g., ECG stimulus generators). IC Role / Device Role / Timing Role: Low-noise, rail-to-rail output stage delivering fast settling (2µs to 0.01%) for waveform generation. Use Value: Enables accurate sub-mV amplitude control and <0.001% harmonic distortion in therapeutic signal paths. |
| Strain Gauges/Sensor Amplifiers | Medical Instrumentation |
|
Use Scenario: Amplifying µV-level Wheatstone bridge outputs from load cells in digital scales. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with 4.5nV/√Hz input noise and ±70µV VOS. Use Value: Resolves <10µV signals with 120dB open-loop gain, supporting 1:100,000 dynamic range measurement. |
Use Scenario: Front-end signal conditioning in portable ultrasound receivers and EEG amplifiers. IC Role / Device Role / Timing Role: Quad-channel low-noise preamp for simultaneous multi-electrode acquisition. Use Value: Four matched channels minimize inter-channel gain/phase mismatch, critical for beamforming accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT6004IUD-TRPBF | Lower supply current (0.85mA/amplifier), but lower GBW (1.9MHz) and higher THD+N (0.001% at 1kHz). | Better suited for ultra-low-power battery monitoring; unsuitable for >100kHz DAC buffering or fast-settling ADC drivers. | Select when power budget <1mA/amplifier dominates; avoid when >5MHz closed-loop bandwidth or <0.0005% THD+N required. |
| OPA4188AIPWR | Zero-drift architecture (0.005µV/°C drift), but higher input voltage noise (8.8nV/√Hz) and no shutdown mode. | Ideal for DC-critical weigh scales; less optimal for AC-coupled audio or wideband sensor interfaces where noise floor matters. | Choose for long-term DC stability in temperature-varying environments; avoid where 4.5nV/√Hz noise floor is mandatory. |
Compared with LT6004IUD-TRPBF and OPA4188AIPWR, the MAX4478AUD-T uniquely balances 10MHz bandwidth, 0.0002% THD+N, and 4.5nV/√Hz noise in a quad configuration - making it the only option among the three qualified for simultaneous high-speed, high-fidelity, multi-channel signal acquisition.
Availability
The MAX4478AUD-T is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor interfaces, and precision data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4478AUD-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 precision signal conditioning in low-voltage, wide-dynamic-range systems - emphasizing rail-to-rail operation, ultra-low noise, and distortion-critical performance.
FAQ
What is the maximum capacitive load the MAX4478AUD-T can drive without oscillation?
The MAX4478AUD-T is specified to remain stable with capacitive loads up to 200pF, as confirmed in the AC Electrical Characteristics table. This eliminates the need for series isolation resistors when driving ADC inputs or coaxial cables in sensor interface applications. Stability is maintained across the full –40°C to +125°C operating range and for supply voltages from 2.7V to 5.5V.
Does the MAX4478AUD-T include a shutdown function?
No, the MAX4478AUD-T does not feature a shutdown pin. Shutdown functionality is only available on the single-channel MAX4475 and MAX4488 variants (pins 5 in SOT23/TDFN packages). The MAX4478AUD-T is a quad amplifier in 14-pin TSSOP and omits SHDN to maintain channel count and pin compatibility across the quad family.
What is the input common-mode voltage range for the MAX4478AUD-T?
The MAX4478AUD-T supports an input common-mode voltage range from (VSS – 0.1V) to (VDD – 1.7V) over the full temperature range (–40°C to +125°C). At +25°C, this extends to (VSS – 0.2V) to (VDD – 1.6V), enabling true ground-sensing operation and compatibility with 0V-referenced transducers and bridge sensors.
Is the MAX4478AUD-T qualified for automotive applications?
The MAX4478AUD-T itself is not automotive-qualified; however, the /V variant (MAX4478AUD/V+) is AEC-Q100 Grade 2 qualified (–40°C to +105°C). The MAX4478AUD-T is rated for –40°C to +125°C and used in industrial and medical applications requiring extended temperature operation, but lacks the automotive-specific stress testing and documentation.
How does the MAX4478AUD-T compare to the MAX4477 in terms of channel count and package?
The MAX4478AUD-T is a quad amplifier in 14-pin TSSOP, whereas the MAX4477 is a dual amplifier offered in 8-pin µMAX or SO packages. Both share identical electrical specifications (10MHz GBW, 0.0002% THD+N, 4.5nV/√Hz noise), but the MAX4478AUD-T provides double the channel density in a single footprint - reducing system cost and board space in multi-sensor applications.
MAX4478AUD-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for MAX4478AUD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4478AUD-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 MAX4478AUD-T reliable?
The price and inventory of MAX4478AUD-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4478AUD-T is usually 5 days.
3.What payment methods are accepted for MAX4478AUD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4478AUD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4478AUD-T?
MAX4478AUD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4478AUD-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 MAX4478AUD-T?
For technical support, including MAX4478AUD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4478AUD-T requirements.
6.How does Aetrix verify that MAX4478AUD-T is sourced from the original manufacturer or authorized distributors?
All MAX4478AUD-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 MAX4478AUD-T meets industry standards.
7.What is the process for return or replacement of MAX4478AUD-T?
All MAX4478AUD-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4478AUD-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 MAX4478AUD-T part is unused and in its original packaging.
Return procedure for MAX4478AUD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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