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Analog Devices Inc./Maxim Integrated MAX4256ESA+
- Part No.:
- MAX4256ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4256ESA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:248
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Product details
Overview
MAX4256ESA+ from Analog Devices is a single-channel, low-noise, low-distortion rail-to-rail output operational amplifier optimized for battery-powered instrumentation. It delivers 22MHz gain-bandwidth product at AV ≥ 10V/V, 0.0002% THD+N (1kHz, 1kΩ), 7.9nV/√Hz input voltage-noise density, and 400μA quiescent current per amplifier - enabling high-fidelity signal conditioning in portable ADC buffer and medical sensor front-end applications.
For engineers reviewing the MAX4256ESA+ datasheet, MAX4256ESA+ pinout, MAX4256ESA+ application, or MAX4256ESA+ equivalent, key selection criteria include its decompensated stability (AV ≥ 10V/V), integrated shutdown control (SHDN pin), SO-8 package compatibility, and guaranteed rail-to-rail output swing within 8mV of rails with 10kΩ load.
Technical Context
The MAX4256ESA+ belongs to the decompensated subgroup (MAX4249/MAX4255/MAX4256/MAX4257) of the MAX4249–MAX4257 family, requiring minimum closed-loop gain of 10V/V for stability and delivering 2.1V/µs slew rate and 68° phase margin at AV = 10V/V. Its input stage features ultra-low bias current (1pA typ) and ground-sensing common-mode range (down to VSS − 0.2V), while the push-pull output drives 1kΩ loads with DC accuracy preserved.
It integrates a dedicated SHDN pin (pin 5 in SO-8) that reduces supply current to 0.5μA and places the output in high-impedance state - a feature confirmed only for MAX4249/MAX4251/MAX4253/MAX4256 variants. Input capacitance is 11pF, and capacitive-load stability extends to 400pF without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 22MHz - supports stable closed-loop operation at gains ≥10V/V with sufficient loop gain for precision filtering and gain stages |
| Total Harmonic Distortion + Noise | 0.0002% THD+N @ 1kHz, 2VP-P, RL=1kΩ - preserves signal integrity in 16-bit ADC front-ends |
| Input Voltage-Noise Density | 7.9nV/√Hz @ 30kHz - enables low-noise amplification of weak sensor signals without thermal noise dominance |
| Quiescent Supply Current | 400μA per amplifier - allows continuous operation in multi-day battery-powered devices |
| Output Voltage Swing | Within 8mV of rails @ 10kΩ load - maximizes dynamic range in 3V or 5V single-supply systems |
| Shutdown Supply Current | 0.5μA - enables micro-power sleep mode without external power gating circuitry |
| Input Common-Mode Range | Extends to VSS − 0.2V - supports direct interfacing with ground-referenced transducers and bridge sensors |
Pinout & Package
MAX4256ESA+ is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC outline, 1.27mm pitch, and RoHS-compliant lead-free finish (+ suffix).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Rail-to-rail output capable of sourcing/sinking ±5mA; high-impedance when SHDN = low |
| 2 | IN− | Inverting input with 11pF capacitance; requires feed-forward compensation if RF||RG > 5kΩ |
| 3 | IN+ | Noninverting input with 1pA bias current; accepts common-mode voltages down to VSS − 0.2V |
| 4 | VSS | Negative supply terminal; connect to ground in single-supply configurations |
| 5 | SHDN | Active-low shutdown control; logic low (≤0.2×VDD) disables amplifier and forces output high-Z |
| 6 | VDD | Positive supply input; operates from 2.4V to 5.5V; bypass with 0.1μF ceramic capacitor |
| 7 | N.C. | No internal connection; left unconnected per datasheet pin description |
| 8 | N.C. | No internal connection; left unconnected per datasheet pin description |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full-scale signal headroom in 3V systems - output reaches within 8mV of VDD and VSS under 10kΩ load |
| Ultra-low input current noise | 0.5fA/√Hz enables high-impedance source interfacing (e.g., piezoelectric sensors) without added Johnson noise |
| Integrated shutdown control | Reduces system standby power by 99.9% (400μA → 0.5μA) with no external FET or sequencing required |
| 400pF capacitive-load drive | Stable operation into typical PCB trace capacitance and ADC input capacitance without isolation resistor |
| Ground-sensing input | Accepts input signals at or below ground potential - eliminates need for level-shifting in bridge or strain-gauge circuits |
Applications
| Portable Medical Sensors | High-Resolution ADC Buffers |
|---|---|
Use Scenario: Amplifying low-level bio-potential signals (ECG, EEG) in handheld diagnostic devices powered by coin-cell batteries. IC Role / Device Role: Precision DC-coupled preamplifier with gain ≥10V/V, driving anti-aliasing filter and 16-bit SAR ADC. Use Value: 7.9nV/√Hz input noise and 0.0002% THD+N preserve microvolt-level signal fidelity across 0.05–150Hz bandwidth. | Use Scenario: Buffering reference and analog input channels in portable data loggers with 16-bit ADCs (e.g., MAX195). IC Role / Device Role: Rail-to-rail output driver ensuring full ADC code utilization with minimal headroom loss. Use Value: Output swing within 8mV of rails at 3V supply enables >99.7% of theoretical dynamic range utilization. |
| Digital Strain Gauge Interfaces | Battery-Powered PA Control Loops |
Use Scenario: Conditioning mV-level Wheatstone bridge outputs in handheld torque or pressure meters. IC Role / Device Role: Low-bias-current instrumentation amplifier front-end (with external resistors) rejecting common-mode offset drift. Use Value: 1pA input bias current minimizes offset error from high-impedance bridge legs (≥10kΩ), reducing calibration burden. | Use Scenario: Closed-loop feedback sensing in Class AB RF power amplifier bias control for LTE/WiFi modules. IC Role / Device Role: High-speed, low-noise error amplifier comparing detector output to reference voltage. Use Value: 22MHz GBW and 2.1V/µs slew rate support fast transient response (<1.6µs settling to 0.01%) during PA power ramp-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4251ESA+ | Unity-gain stable, 3MHz GBW, no shutdown pin, SO-8 package | Suitable for lower-speed, fixed-gain ≤1V/V applications where shutdown is unnecessary | Select when gain ≤1V/V and power-down capability is not required - avoids decompensation design constraints |
| OPA333AIDR | Zero-drift architecture, 350kHz GBW, 17μV max VOS, no shutdown, SO-8 | Better DC precision (VOS drift <0.1μV/°C) but insufficient speed/noise performance for audio or ADC buffering | Select for ultra-low offset drift in DC-coupled sensor interfaces where bandwidth <100kHz suffices |
Compared with MAX4251ESA+, MAX4256ESA+ provides 7.3× higher bandwidth and integrated shutdown, but requires AV ≥10V/V; compared with OPA333AIDR, it trades zero-drift DC accuracy for 63× higher GBW and 4.6× lower voltage noise - making it superior for AC-coupled, wideband signal chains.
Availability
MAX4256ESA+ is available at Aetrix Electronics and suitable for portable medical sensors, high-resolution ADC buffers, and battery-powered PA control loops requiring stable component supply with guaranteed long-term availability.
Supply support for MAX4256ESA+ 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 semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The MAX4249–MAX4257 product line was engineered for ultra-low-noise, low-distortion signal conditioning in space-constrained, battery-operated systems - emphasizing rail-to-rail output swing, ground-sensing inputs, and micropower shutdown capability.
FAQ
What is the minimum stable gain for MAX4256ESA+ and why does it matter?
The MAX4256ESA+ is decompensated and requires a minimum closed-loop gain of 10V/V for stability. This design enables its 22MHz gain-bandwidth product and 2.1V/µs slew rate - critical for high-fidelity, wideband applications like ADC buffering. Using it at lower gains risks oscillation unless external compensation is applied per the feed-forward capacitor guidelines in the datasheet.
Does MAX4256ESA+ support true rail-to-rail input operation?
No - MAX4256ESA+ features rail-to-rail *output* swing but only ground-sensing *input* common-mode range (VCM down to VSS − 0.2V). Its input does not swing to VDD; the guaranteed common-mode range extends to VDD − 1.1V. This makes it ideal for single-supply systems interfacing with ground-referenced sources, but not for inputs near the positive rail.
How does the shutdown function behave on MAX4256ESA+?
When the SHDN pin (pin 5) is pulled low (≤0.2×VDD), MAX4256ESA+ reduces quiescent current to 0.5μA and places the output in a high-impedance state - disconnecting it from the load. The amplifier resumes normal operation within 3.5µs after SHDN returns high. This behavior is confirmed specifically for MAX4256 and is not shared by all members of the MAX4249–MAX4257 family.
Can MAX4256ESA+ drive a 1000pF capacitive load directly?
No - MAX4256ESA+ is stable up to 400pF without external compensation. For 1000pF loads, an isolation resistor (e.g., 150Ω) must be placed in series between the output and the capacitive load to maintain phase margin and prevent peaking or oscillation, as specified in the Capacitive-Load Driving Circuit application note.
What is the input voltage-noise density profile of MAX4256ESA+ across frequency?
MAX4256ESA+ exhibits 27nV/√Hz at 10Hz (flicker-dominated), 8.9nV/√Hz at 1kHz, and 7.9nV/√Hz at 30kHz (thermal noise floor). This flat, low-noise profile above 1kHz makes it especially effective for audio, ultrasound, and wideband sensor signal chains where thermal noise dominates system noise budget.
MAX4256ESA+ 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:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 2.1V/µs
- Gain Bandwidth Product:
- 22 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 420µA
- Current - Output / Channel:
- -
- 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-SOIC
MAX4256ESA+ FAQ
1.How can I place an order for MAX4256ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4256ESA+ 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 MAX4256ESA+ reliable?
The price and inventory of MAX4256ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4256ESA+ is usually 5 days.
3.What payment methods are accepted for MAX4256ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4256ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4256ESA+?
MAX4256ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4256ESA+ 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 MAX4256ESA+?
For technical support, including MAX4256ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4256ESA+ requirements.
6.How does Aetrix verify that MAX4256ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX4256ESA+ 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 MAX4256ESA+ meets industry standards.
7.What is the process for return or replacement of MAX4256ESA+?
All MAX4256ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4256ESA+, 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 MAX4256ESA+ part is unused and in its original packaging.
Return procedure for MAX4256ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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