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Analog Devices Inc./Maxim Integrated MAX4494ASA
- Part No.:
- MAX4494ASA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4494ASA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,733
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Product details
Overview
The MAX4494ASA from Maxim Integrated is a dual-channel, rail-to-rail output operational amplifier designed for precision signal conditioning in automotive and industrial systems operating from ±2.25V to ±5.5V dual supplies or +4.5V to +11V single supply. It delivers 5MHz gain-bandwidth, 770µA per amplifier quiescent current, 110dB open-loop gain (RL = 100kΩ), and output swing within 10mV of either rail (RL = 100kΩ), enabling high-accuracy DAC buffering in battery-powered sensor interfaces.
For engineers reviewing the MAX4494ASA datasheet, MAX4494ASA pinout, MAX4494ASA application, or MAX4494ASA equivalent, key selection criteria include its -40°C to +125°C automotive temperature rating, 8-pin SO package footprint, rail-to-rail output stage with 200mV rail margin at 1kΩ load, and low THD+N of 0.002% at 1kHz - critical for audio and precision analog front-ends.
Technical Context
This bipolar-process op amp features a rail-to-rail output stage capable of driving loads down to 1kΩ while maintaining ≤200mV from supply rails, and an input common-mode range extending 200mV below VEE to within 1.5V of VCC. Its unity-gain stability and 75° phase margin ensure robust performance in closed-loop configurations without external compensation.
The device achieves 0.002% THD+N at 1kHz with 5VP-P output and exhibits no phase reversal under overdriven input conditions. Its 3V/µs slew rate and 190kHz full-power bandwidth support moderate-speed signal acquisition while maintaining low distortion across the automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 5MHz - supports stable unity-gain and low-noise amplification up to audio frequencies |
| Quiescent Current per Amplifier | 770µA - enables dual-channel operation in power-constrained systems like portable instrumentation |
| Input Common-Mode Range | VEE – 0.2V to VCC – 1.5V - accommodates ground-referenced inputs and wide-swing sensor signals |
| Output Voltage Swing | Within 10mV of rails (RL = 100kΩ) - maximizes dynamic range in low-voltage data acquisition |
| Open-Loop Gain | 110dB (RL = 100kΩ) - ensures <0.001% gain error in precision buffer and reference applications |
| THD+N | 0.002% at f = 1kHz - meets high-fidelity signal chain requirements for sensor and audio conditioning |
| Slew Rate | 3V/µs - supports 5VP-P output at 190kHz full-power bandwidth without distortion |
Pinout & Package
The MAX4494ASA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and rated for automotive temperature operation (-40°C to +125°C). This surface-mount package measures 4.9mm × 3.9mm with 1.27mm pitch, compatible with standard PCB assembly processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Channel A Output | Amplified output of first op amp; rail-to-rail swing supports full-scale DAC interface |
| 2 (INA–) | Channel A Inverting Input | Inverting node for feedback configuration; 110MΩ input resistance minimizes loading |
| 3 (INA+) | Channel A Noninverting Input | High-impedance input for sensor or reference voltage; extends 200mV below VEE |
| 4 (VEE) | Negative Supply | Ground or negative rail connection; bypass with 0.1µF capacitor for noise immunity |
| 5 (VCC) | Positive Supply | Positive rail connection; requires local 0.1µF decoupling to suppress supply transients |
| 6 (INB+) | Channel B Noninverting Input | Independent second channel input; matched offset voltage (≤1mV) enables differential sensing |
| 7 (INB–) | Channel B Inverting Input | Second channel inverting node; identical AC/DC specs to Channel A for consistent performance |
| 8 (OUTB) | Channel B Output | Second rail-to-rail output; enables dual-path signal conditioning without cross-talk degradation |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Enables full utilization of supply voltage headroom in low-voltage systems (e.g., +5V single-supply DAC buffers) |
| No phase reversal on overdrive | Prevents latch-up or erratic behavior when inputs exceed common-mode limits - critical in transient-prone industrial environments |
| Automotive temperature rating | -40°C to +125°C operation ensures reliability in engine control units, ADAS sensors, and under-hood electronics |
| Low THD+N (0.002%) | Preserves signal fidelity in audio preamplifiers and high-resolution sensor signal chains where harmonic distortion degrades accuracy |
| Unity-gain stable | Eliminates need for external compensation components, reducing BOM count and layout complexity in gain-of-one configurations |
Applications
| Battery-Powered Sensor Interface | DAC Output Amplifier |
|---|---|
|
Use Scenario: Signal conditioning for low-power MEMS accelerometers and temperature sensors in portable diagnostic tools. IC Role / Device Role / Timing Role: Dual-channel buffer and level-shifter, converting ratiometric sensor outputs to ADC-compatible voltage ranges. Use Value: 770µA per amplifier quiescent current extends battery life; rail-to-rail output ensures full-scale use of 12-bit ADC input range. |
Use Scenario: Post-DAC amplification in programmable voltage sources for automated test equipment. IC Role / Device Role / Timing Role: Precision voltage follower with low offset drift, translating DAC output to drive 1kΩ loads. Use Value: 10mV rail margin at 100kΩ and 200mV at 1kΩ preserves resolution; 0.002% THD+N prevents harmonic contamination of synthesized waveforms. |
| Industrial Control Loop | Voltage Reference Generator |
|
Use Scenario: Feedback amplification in 4–20mA transmitter circuits with HART modulation capability. IC Role / Device Role / Timing Role: High-common-mode rejection amplifier isolating loop current sense voltage from noisy field wiring. Use Value: 90dB CMRR at DC and 65dB at 10kHz rejects induced noise; 110dB open-loop gain ensures <0.001% loop gain error. |
Use Scenario: Buffered reference output for multi-channel precision ADCs in data loggers. IC Role / Device Role / Timing Role: Low-drift, low-noise buffer stabilizing bandgap references against load variation and supply ripple. Use Value: 3µV/°C offset drift and 8nV/√Hz input noise maintain reference integrity; dual channels support independent VREF/VREF/2 generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV358AMX/NOPB | Lower GBWP (1MHz), higher quiescent current (150µA per amp), no extended input range below VEE | Not qualified for automotive temp range; suitable only for commercial-grade cost-sensitive designs | Select only if supply voltage >±3V and THD+N >0.01% is acceptable |
| TSV912IDT | Higher GBWP (8MHz), lower quiescent current (80µA), but limited input range (VEE to VCC–1.2V) and no automotive qualification | Lacks -40°C to +125°C rating and rail-to-rail input; unsuitable for harsh-environment sensor nodes | Consider only for consumer-grade, low-power, high-speed applications outside automotive/industrial use |
Compared with LMV358AMX/NOPB and TSV912IDT, the MAX4494ASA provides guaranteed automotive temperature operation, extended input common-mode range below VEE, and superior THD+N - making it the only option among the three qualified for precision, high-reliability dual-channel buffering in automotive control modules and industrial PLC analog I/O.
Availability
The MAX4494ASA is available at Aetrix Electronics and suitable for battery-powered systems, DAC output amplification, and industrial control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4494ASA 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX4493/MAX4494/MAX4495 family was engineered for low-power, rail-to-rail precision amplification in space-constrained, thermally demanding applications - particularly automotive sensor interfaces and portable instrumentation.
FAQ
What is the maximum capacitive load the MAX4494ASA can drive without oscillation?
The MAX4494ASA is stable with capacitive loads up to 300pF when configured in unity-gain. For larger loads, an isolation resistor (e.g., 15Ω) in series with the output restores stability - verified in the datasheet's Typical Operating Characteristics (Figure MAX4493-22 through MAX4493-24). This behavior applies identically to both channels of the MAX4494ASA.
Does the MAX4494ASA support single-supply operation, and what is the minimum voltage?
Yes, the MAX4494ASA operates from a single supply of +4.5V to +11V. Its input common-mode range extends 200mV below the negative rail (i.e., to ground in single-supply mode), and its rail-to-rail output delivers full swing from near 0V to near VCC - enabling direct interfacing with microcontroller ADCs and DACs powered from +5V rails.
What is the input offset voltage specification for the MAX4494ASA over temperature?
The MAX4494ASA guarantees a maximum input offset voltage of 10mV over the full automotive temperature range (-40°C to +125°C), with typical drift of 3µV/°C. At +25°C, typical VOS is 0.3mV. These values are confirmed in the DC Electrical Characteristics table and validated by design across all production units.
Is the MAX4494ASA pin-compatible with other devices in the MAX449x family?
The MAX4494ASA uses the standard 8-pin SO footprint shared by all MAX4494 variants (e.g., MAX4494AKA+, MAX4494AKA/V+T), but differs from the 8-pin SOT23 and µMAX packages in pin spacing and thermal characteristics. Pin functions are identical across all MAX4494 packages - OUTA, INA–, INA+, VEE, VCC, INB+, INB–, OUTB - ensuring drop-in replacement within the same package type.
How does the MAX4494ASA perform in terms of power-supply rejection ratio (PSRR)?
The MAX4494ASA delivers 65dB to 80dB PSRR across its ±2.25V to ±5.5V supply range, with typical performance of 75dB at 1kHz. This PSRR level effectively suppresses supply ripple and noise coupling into sensitive analog signal paths - critical for maintaining accuracy in shared-rail systems with digital switching noise.
MAX4494ASA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 200 nA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 770µA (x2 Channels)
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 11 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4494ASA FAQ
1.How can I place an order for MAX4494ASA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4494ASA 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 MAX4494ASA reliable?
The price and inventory of MAX4494ASA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4494ASA is usually 5 days.
3.What payment methods are accepted for MAX4494ASA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4494ASA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4494ASA?
MAX4494ASA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4494ASA 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 MAX4494ASA?
For technical support, including MAX4494ASA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4494ASA requirements.
6.How does Aetrix verify that MAX4494ASA is sourced from the original manufacturer or authorized distributors?
All MAX4494ASA 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 MAX4494ASA meets industry standards.
7.What is the process for return or replacement of MAX4494ASA?
All MAX4494ASA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4494ASA, 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 MAX4494ASA part is unused and in its original packaging.
Return procedure for MAX4494ASA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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