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Analog Devices Inc./Maxim Integrated MAX4257EUA
- Part No.:
- MAX4257EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4257EUA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,849
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Product details
Overview
MAX4257EUA from Analog Devices is a single-supply, rail-to-rail output operational amplifier optimized for low-noise (7.9nV/√Hz at 30kHz), low-distortion (0.0012% THD+N at 1kHz, AV=1V/V) portable instrumentation. It delivers 22MHz gain-bandwidth product with stability at gains ≥10V/V, draws only 400µA quiescent current per amplifier, and operates from 2.4V to 5.5V - making it ideal for battery-powered ADC buffers and medical sensor front-ends.
For engineers reviewing the MAX4257EUA datasheet, MAX4257EUA pinout, MAX4257EUA application, or MAX4257EUA equivalent, key selection criteria include its decompensated 22MHz GBW architecture, 8mV rail-to-rail output swing into 10kΩ, shutdown capability (0.5µA), and compatibility with high-impedance sources like strain gauges and piezoelectric transducers.
Technical Context
The MAX4257EUA is a dual-channel, internally compensated op amp requiring minimum closed-loop gain of 10V/V for stability - distinct from unity-gain-stable variants (e.g., MAX4250–MAX4254). Its 2.1V/µs slew rate and 68° phase margin at AV=10V/V support fast settling (1.6µs to 0.01%) in precision signal conditioning paths.
It features ground-sensing inputs (VCM includes VSS), push-pull rail-to-rail outputs capable of ±5mA drive, and robust capacitive-load handling up to 400pF without external compensation - critical for driving ADC input filters or long PCB traces in compact portable designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 22MHz - enables stable operation at AV ≥ 10V/V with sufficient loop gain for low-distortion 16-bit ADC buffering |
| Slew Rate | 2.1V/µs - supports fast transient response in pulse-amplification and active filter applications |
| Input Voltage-Noise Density | 7.9nV/√Hz at 30kHz - ensures minimal added noise in wideband sensor signal chains |
| Total Harmonic Distortion + Noise | 0.0012% at 1kHz, AV=1V/V, RL=1kΩ - meets fidelity requirements for audio-grade and medical instrumentation |
| Quiescent Supply Current | 400µA per amplifier - enables multi-channel low-power operation in battery-constrained systems |
| Rail-to-Rail Output Swing | Within 8mV of rails into 10kΩ - maximizes dynamic range in 3V or lower single-supply systems |
| Input Common-Mode Range | Extends to VSS (ground) and up to VDD − 1.1V - allows direct interfacing with ground-referenced sensors |
Pinout & Package
MAX4257EUA is housed in an 8-pin µMAX® package (pin-compatible with SO-8), measuring 3mm × 3mm with exposed pad for thermal enhancement. Pin 1 = OUTA, Pin 2 = IN−A, Pin 3 = IN+A, Pin 4 = VSS, Pin 5 = VDD, Pin 6 = IN−B, Pin 7 = IN+B, Pin 8 = OUTB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | OUTA, OUTB | Amplifier outputs - rail-to-rail, high-current push-pull stage capable of ±5mA drive |
| 2, 6 | IN−A, IN−B | Inverting inputs - matched pair with 1pA bias current, enabling precision differential gain configurations |
| 3, 7 | IN+A, IN+B | Noninverting inputs - support ground-referenced sensing; common-mode range includes VSS |
| 4 | VSS | Negative supply terminal - connect directly to system ground in single-supply operation |
| 5 | VDD | Positive supply terminal - accepts 2.4V to 5.5V; requires local 0.1µF ceramic bypass |
Key Features
| Feature | Design Value |
|---|---|
| Decompensated 22MHz GBW | Enables high closed-loop gain (≥10V/V) with superior bandwidth and distortion performance vs. unity-gain-stable variants |
| Ultra-low input current noise | 0.5fA/√Hz - preserves signal integrity when amplifying high-impedance sources (e.g., piezoelectric sensors) |
| Rail-to-rail output with 8mV headroom | Maximizes usable voltage swing in 2.4V–3.3V systems, improving SNR in low-voltage data acquisition |
| 400pF capacitive-load stability | Eliminates need for isolation resistors when driving ADC input RC filters or long traces |
| Low THD+N (0.0012% @ 1kHz) | Meets stringent linearity requirements for 16-bit analog-to-digital conversion without post-processing correction |
Applications
| ADC Buffering | Portable Medical Sensors |
|---|---|
Use Scenario: Driving the input of a 16-bit SAR ADC (e.g., MAX195) in a handheld ECG monitor. IC Role / Device Role / Timing Role: Precision voltage follower/buffer isolating high-impedance electrode signals while preserving DC accuracy and settling within 1.6µs. Use Value: 7.9nV/√Hz input noise and 0.0012% THD+N ensure full 16-bit ENOB is maintained across 0.05–100Hz bandwidth. | Use Scenario: Signal conditioning for a battery-powered digital scale using strain-gauge bridge outputs. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end stage with gain ≥10V/V, leveraging rail-to-rail output to maximize resolution on 3.3V ADC reference. Use Value: Input common-mode range including ground enables direct connection to bridge midpoints without level-shifting circuitry. |
| Piezoelectric Transducer Interface | Wireless PA Control Loop |
Use Scenario: Amplifying low-level charge output from ultrasonic transducers in portable NDT equipment. IC Role / Device Role / Timing Role: Low-bias-current, low-noise preamplifier with 1pA IBIAS and 0.5fA/√Hz current noise to minimize Johnson-Nyquist degradation. Use Value: 22MHz GBW supports wideband pulse-echo response up to 200kHz while maintaining <0.007% THD+N at 20kHz. | Use Scenario: Closed-loop envelope detection and gain control in a Bluetooth LE audio transmitter's power amplifier stage. IC Role / Device Role / Timing Role: High-speed comparator-like buffer in feedback path, delivering fast settling (<2µs) and low drift for accurate RF power regulation. Use Value: 2.1V/µs slew rate and 68° phase margin ensure stable, jitter-free control loop dynamics under varying load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, decompensated op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4256ESA+ | Same 22MHz GBW, 8-pin SO package; higher max operating temperature (+85°C vs. +85°C), no exposed thermal pad | Preferred for through-hole prototyping or legacy SO-8 board reuse; slightly lower thermal performance in high-density layouts | Select MAX4256ESA+ when SO-8 footprint compatibility or simplified assembly is required over µMAX size constraints |
| OPA2350EA/250 | 22MHz GBW, rail-to-rail I/O, but higher quiescent current (1.8mA), higher input voltage noise (7nV/√Hz), no shutdown mode | Better for AC-coupled, non-battery applications where power budget allows; lacks low-power shutdown | Choose OPA2350EA/250 only if thermal dissipation margin permits higher IQ and shutdown functionality is unnecessary |
Compared with MAX4256ESA+, MAX4257EUA offers superior thermal management via µMAX exposed pad and smaller footprint; versus OPA2350EA/250, it delivers 4.5× lower supply current and integrated shutdown - critical for always-on portable instrumentation.
Availability
MAX4257EUA is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered ADC interfaces, and wireless transceiver analog front-ends requiring stable component supply across extended production lifecycles.
Supply support for MAX4257EUA 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The MAX4249–MAX4257 family was designed specifically for ultra-low-noise, low-distortion signal conditioning in space-constrained, battery-operated instrumentation - emphasizing rail-to-rail operation, sub-1µA shutdown, and decompensated bandwidth for precision ADC drivers.
FAQ
What is the minimum stable gain for MAX4257EUA?
The MAX4257EUA is internally compensated for minimum closed-loop gain of 10V/V. Operating at unity gain or gains below 10V/V may cause instability, oscillation, or degraded phase margin. For unity-gain applications, select the MAX4250–MAX4254 series instead. This gain constraint is inherent to its 22MHz GBW architecture and must be respected in all schematic designs using MAX4257EUA.
Does MAX4257EUA support shutdown mode?
No, MAX4257EUA does not include a shutdown pin or function. Shutdown capability is only available on specific variants: MAX4249, MAX4251, MAX4253, and MAX4256. The MAX4257EUA is a dual-channel op amp without SHDN terminals - confirmed by its 8-pin µMAX pinout (no dedicated shutdown pin) and absence of shutdown specifications in its electrical characteristics table.
What is the maximum capacitive load MAX4257EUA can drive without external compensation?
MAX4257EUA maintains stable operation driving capacitive loads up to 400pF without requiring external isolation resistors or feed-forward compensation. This is verified in the Electrical Characteristics table under "Capacitive-Load Stability" and supported by Typical Operating Characteristics (TOC19, TOC33). Loads exceeding 400pF require an RISO resistor per Figure 5 in the datasheet to preserve phase margin.
Can MAX4257EUA operate from a 2.4V single supply?
Yes, MAX4257EUA is fully specified for single-supply operation from 2.4V to 5.5V. At 2.4V, it retains rail-to-rail output swing (within 25mV of rails into 10kΩ), 400µA quiescent current, and functional input common-mode range down to VSS. All key parameters - including THD+N, GBW, and output swing - are guaranteed across this voltage range per the Absolute Maximum Ratings and Electrical Characteristics tables.
Is MAX4257EUA pin-compatible with other devices in the MAX4249–MAX4257 family?
MAX4257EUA (8-pin µMAX) shares pinout compatibility with MAX4252, MAX4256, and MAX4257ESA+ (SO-8), but not with SOT23 or UCSP variants. Pin 1 = OUTA, Pin 2 = IN−A, Pin 3 = IN+A, Pin 4 = VSS, Pin 5 = VDD, Pin 6 = IN−B, Pin 7 = IN+B, Pin 8 = OUTB is consistent across all 8-pin µMAX/SO versions. However, functional differences (e.g., shutdown presence, GBW, gain stability) mean direct substitution requires circuit validation.
MAX4257EUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 2.1V/µs
- Gain Bandwidth Product:
- 22 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.1 pA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 420µA (x2 Channels)
- Current - Output / Channel:
- 68 mA
- Voltage - Supply Span (Min):
- 2.4 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4257EUA FAQ
1.How can I place an order for MAX4257EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4257EUA 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 MAX4257EUA reliable?
The price and inventory of MAX4257EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4257EUA is usually 5 days.
3.What payment methods are accepted for MAX4257EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4257EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4257EUA?
MAX4257EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4257EUA 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 MAX4257EUA?
For technical support, including MAX4257EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4257EUA requirements.
6.How does Aetrix verify that MAX4257EUA is sourced from the original manufacturer or authorized distributors?
All MAX4257EUA 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 MAX4257EUA meets industry standards.
7.What is the process for return or replacement of MAX4257EUA?
All MAX4257EUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4257EUA, 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 MAX4257EUA part is unused and in its original packaging.
Return procedure for MAX4257EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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