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Analog Devices Inc./Maxim Integrated MAX4256ESA+T
- Part No.:
- MAX4256ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4256ESA+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
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Product details
Overview
MAX4256ESA+T 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 ≥10V/V gain, 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-ends.
For engineers reviewing the MAX4256ESA+T datasheet, MAX4256ESA+T pinout, MAX4256ESA+T application, or MAX4256ESA+T equivalent, key selection criteria include its decompensated stability (AV ≥ 10V/V), integrated shutdown mode (0.5μA), rail-to-rail swing within 8mV of supplies (10kΩ), and SO-8 package compatibility with space-constrained analog signal chains.
Technical Context
The MAX4256ESA+T employs a decompensated internal architecture requiring minimum closed-loop gain of 10V/V for stability, enabling 2.1V/μs slew rate and superior distortion performance versus unity-gain-stable variants. Its input stage features ultra-low bias current (1pA typ) and ground-sensing common-mode range (to VSS), supporting direct interfacing with high-impedance transducers.
Output stage uses complementary push-pull topology delivering ±5mA drive capability while maintaining rail-to-rail swing (8mV from rails, 10kΩ load) and 400pF capacitive-load stability without external compensation-critical for driving ADC reference buffers and multiplexed sensor arrays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 22MHz - supports stable closed-loop operation at AV ≥ 10V/V for high-speed precision gain stages |
| Total Harmonic Distortion + Noise | 0.0002% at 1kHz, 2VP-P, RL = 1kΩ - preserves signal integrity in 16-bit ADC front-ends |
| Input Voltage-Noise Density | 7.9nV/√Hz at 30kHz - enables low-noise amplification of weak sensor signals without added thermal noise floor |
| Quiescent Supply Current | 400μA per amplifier - extends battery life in portable medical and wireless equipment |
| Rail-to-Rail Output Swing | Within 8mV of VDD/VSS (10kΩ load) - maximizes dynamic range in 2.4V–5.5V single-supply systems |
| Shutdown Supply Current | 0.5μA - reduces system standby power by >99.9% when amplifier disabled |
| Input Common-Mode Range | Extends to VSS −0.2V - allows direct connection to ground-referenced sensors without level-shifting |
Pinout & Package
MAX4256ESA+T is housed in an 8-pin SO (Small Outline) package with exposed pad for thermal enhancement. Pin mapping is validated per Analog Devices' official pin configuration diagram for MAX4256 in SO-8 format.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output terminal; rail-to-rail capable, drives 1kΩ loads with DC accuracy |
| 2 | IN− | Inverting input; high-impedance node (1000GΩ) for precision feedback networks |
| 3 | IN+ | Noninverting input; accepts common-mode voltages down to VSS −0.2V |
| 4 | VSS | Negative supply pin; connect to ground in single-supply configurations |
| 5 | SHDN | Active-low shutdown control; pulls outputs to high-impedance state when driven low |
| 6 | VDD | Positive supply pin; operates from 2.4V to 5.5V with 0.1μF local bypass required |
| 7 | N.C. | No internal connection; leave unconnected or tie to ground for mechanical stability |
| 8 | N.C. | No internal connection; no electrical function; PCB layout may use for thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| Decompensated GBW | 22MHz bandwidth at AV ≥ 10V/V enables faster settling (1.6μs to 0.01%) than unity-gain alternatives |
| Ultra-Low THD+N | 0.0002% at 1kHz ensures minimal harmonic corruption in audio and precision measurement paths |
| Integrated Shutdown | 0.5μA shutdown current and high-Z output allow dynamic power gating in multi-channel sensor systems |
| Rail-to-Rail Output | Swing within 8mV of rails at 10kΩ load preserves full-scale resolution in low-voltage ADC interfaces |
| Capacitive-Load Stability | Stable with up to 400pF load eliminates need for isolation resistors in DAC output buffering |
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 interface from ADC sampling capacitance. Use Value: 7.9nV/√Hz input noise and 0.0002% THD+N prevent SNR degradation; rail-to-rail swing maximizes utilization of 2.4V supply headroom. | Use Scenario: Amplifying low-level piezoelectric transducer output in a portable ultrasound probe. IC Role / Device Role / Timing Role: Low-noise, high-input-impedance preamplifier conditioning microvolt-level sensor signals before digitization. Use Value: 1pA input bias current avoids loading high-Z transducers; ground-sensing input enables direct DC-coupled connection. |
| Wireless PA Control | Digital Strain Gauge Interface |
Use Scenario: Closed-loop RF power amplifier bias control in LTE/Wi-Fi modules with battery backup. IC Role / Device Role / Timing Role: Precision current-sense amplifier feeding feedback to PA bias controller under varying supply conditions. Use Value: 400μA quiescent current minimizes standby drain; 2.4V–5.5V operation matches Li-ion battery discharge profile. | Use Scenario: Wheatstone bridge excitation and differential amplification in handheld digital scales. IC Role / Device Role / Timing Role: Instrumentation-grade amplifier with matched input impedance rejecting common-mode noise from bridge excitation. Use Value: 70μV max input offset and 0.3μV/°C tempco ensure stable zero-point calibration across -40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, low-distortion op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4251ESA+ | Unity-gain stable, 3MHz GBW, 0.3V/μs slew rate, no shutdown | Better suited for AV = 1–5V/V gain configurations and lower-frequency sensor buffering | Select when unity-gain stability or lower bandwidth suffices and shutdown is unnecessary |
| OPA377AIDR | 10MHz GBW, 2.5V/μs slew rate, 7nV/√Hz noise, no shutdown, SO-8 | Higher DC precision (10μV VOS), but lacks integrated shutdown and has higher IQ (760μA) | Prefer when ultra-low offset dominates over power savings and shutdown functionality |
Compared with MAX4251ESA+ and OPA377AIDR, MAX4256ESA+T uniquely combines 22MHz GBW at AV ≥ 10V/V, sub-μA shutdown, and 0.0002% THD+N-making it optimal for high-fidelity, power-gated gain stages where speed, fidelity, and battery life are jointly constrained.
Availability
MAX4256ESA+T is available at Aetrix Electronics and suitable for portable medical instrumentation, wireless communications infrastructure, and precision industrial sensing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4256ESA+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
MAX4256ESA+T belongs to the UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps product line, engineered specifically for high-dynamic-range, battery-operated signal acquisition systems demanding simultaneous low noise, low distortion, and micropower operation.
FAQ
What is the minimum stable gain for MAX4256ESA+T?
The MAX4256ESA+T is decompensated and requires a minimum closed-loop gain of 10V/V for stable operation. Attempting unity-gain or gains below 10V/V may cause oscillation or excessive peaking. This design enables its 22MHz gain-bandwidth product and 2.1V/μs slew rate-key advantages over unity-gain-stable alternatives like the MAX4251ESA+. Always verify phase margin using the recommended test conditions in the datasheet.
Does MAX4256ESA+T support true rail-to-rail input operation?
MAX4256ESA+T does not support rail-to-rail input; its input common-mode voltage range extends from VSS −0.2V to VDD −1.1V. However, it does provide true rail-to-rail output swing-within 8mV of both VDD and VSS with a 10kΩ load. This makes it ideal for output buffering and driving ADC references, but input signals must stay ≥0.2V above VSS and ≤1.1V below VDD to avoid clipping or phase reversal.
How does the shutdown feature of MAX4256ESA+T behave electrically?
When the SHDN pin of MAX4256ESA+T is pulled low (≤0.2 × VDD), the amplifier enters shutdown mode: supply current drops to 0.5μA typical, and the output transitions to a high-impedance (Hi-Z) state-neither sourcing nor sinking current. The output remains Hi-Z until SHDN is returned high (≥0.8 × VDD), after which the amplifier enables with 3.5μs typical delay to full output regulation. This behavior is confirmed in the Electrical Characteristics table and Typical Operating Characteristics plots.
Can MAX4256ESA+T drive a 1000pF capacitive load directly?
No, MAX4256ESA+T is only guaranteed stable with capacitive loads up to 400pF. Driving 1000pF directly will likely cause peaking or oscillation. To maintain stability, insert a series isolation resistor (RISO) between the output and the load-150Ω is recommended for 1000pF per Analog Devices' Application Note. This technique preserves signal fidelity while avoiding instability, as verified in Figure 6 and related stability analysis in the datasheet.
What is the input offset voltage specification for MAX4256ESA+T over temperature?
The input offset voltage (VOS) for MAX4256ESA+T is specified as ±0.07mV (±70μV) maximum at +25°C, and ±0.75mV (±750μV) maximum over the full −40°C to +85°C operating range. Its offset voltage temperature coefficient is 0.3μV/°C typical, meaning drift contributes <0.3μV per °C change. These values are measured per standard test conditions (VDD = 5V, RL = 10kΩ to VDD/2) and are critical for precision DC-coupled applications like strain gauge amplifiers.
MAX4256ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 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-SOIC
MAX4256ESA+T FAQ
1.How can I place an order for MAX4256ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4256ESA+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 MAX4256ESA+T reliable?
The price and inventory of MAX4256ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4256ESA+T is usually 5 days.
3.What payment methods are accepted for MAX4256ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4256ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4256ESA+T?
MAX4256ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4256ESA+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 MAX4256ESA+T?
For technical support, including MAX4256ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4256ESA+T requirements.
6.How does Aetrix verify that MAX4256ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX4256ESA+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 MAX4256ESA+T meets industry standards.
7.What is the process for return or replacement of MAX4256ESA+T?
All MAX4256ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4256ESA+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 MAX4256ESA+T part is unused and in its original packaging.
Return procedure for MAX4256ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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