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Analog Devices Inc./Maxim Integrated MAX4431ESA+
- Part No.:
- MAX4431ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4431ESA+.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,173
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Product details
Overview
The MAX4431ESA+ from Maxim Integrated is a single, dual-supply, voltage-feedback operational amplifier optimized for high-speed, low-distortion ADC driving applications. It features +2V/V minimum stable gain, 215MHz small-signal -3dB bandwidth, 145V/µs slew rate, and 63ns 16-bit (0.0015%) settling time. Designed specifically to drive 14- and 16-bit analog-to-digital converters with ≥4Vp-p input dynamic range, it delivers 100dB SFDR at 1MHz while consuming only 11mA per amplifier.
For engineers reviewing the MAX4431ESA+ datasheet, MAX4431ESA+ pinout, MAX4431ESA+ application, or MAX4431ESA+ equivalent, key selection criteria include closed-loop gain stability requirement (+2V/V), output drive capability (±60mA), input voltage noise density (2.8nV/√Hz), and SO-8 package compatibility with high-density mixed-signal PCB layouts.
Technical Context
The MAX4431ESA+ uses a voltage-feedback architecture with internal compensation for closed-loop gains of +2V/V or greater - distinct from unity-gain-stable variants like the MAX4430. Its 215MHz bandwidth and 145V/µs slew rate enable accurate amplification of fast transient signals without phase distortion or slewing artifacts in precision sampling systems.
It operates from dual ±4.5V to ±5.5V supplies, supports rail-to-rail output swing (VEE + 2.6V to VCC – 0.6V into 500Ω), and maintains 110dB minimum open-loop gain across temperature. Input common-mode range extends from VEE + 2.5V to VCC – 0.9V, enabling flexible signal referencing in bipolar front-end designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 215MHz at AVCL = +2 - enables stable amplification of IF/RF signals up to Nyquist frequency of 100+ MSPS ADCs |
| Settling Time (16-bit) | 63ns to 0.0015% - ensures full resolution capture within one ADC sample period at ≥15MSPS |
| Slew Rate | 145V/µs - prevents distortion on large-amplitude, fast-edge signals such as pulse-shaped baseband waveforms |
| Input Voltage Noise | 2.8nV/√Hz at 100kHz - preserves SNR in low-level preamplifier stages before high-resolution ADCs |
| Spurious-Free Dynamic Range | 100dBc at 1MHz, 4Vp-p - meets spectral purity requirements for communications receiver IF chains |
| Output Drive Current | ±60mA into 500Ω - directly drives ADC inputs with ≥4Vp-p dynamic range without external buffering |
| Supply Current | 11mA per amplifier - balances speed and power efficiency for multi-channel instrumentation systems |
Pinout & Package
The MAX4431ESA+ is housed in an 8-pin SO (SOIC-N) surface-mount package, compatible with standard 150mil-wide SOIC footprints and reflow assembly processes.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection | Internally unconnected; must be left floating or tied to ground per layout best practice |
| 2 | VCC | Positive supply pin; requires local 0.1µF ceramic bypass capacitor to ground for high-frequency stability |
| 3 | OUT | Amplifier output; capable of ±60mA drive and ≥4Vp-p swing into 500Ω loads |
| 4 | No Connection | Internally unconnected; no electrical function - avoid routing signals or vias beneath |
| 5 | VEE | Negative supply pin; requires dedicated low-inductance return path to ground plane |
| 6 | IN+ | Noninverting input; high-impedance node (1MΩ typical); sensitive to layout-induced parasitic capacitance |
| 7 | IN− | Inverting input; matched to IN+ for optimal CMRR; forms feedback node in closed-loop configurations |
| 8 | No Connection | Internally unconnected; electrically isolated - no biasing or termination required |
Key Features
| Feature | Design Value |
|---|---|
| +2V/V minimum stable gain | Enables higher closed-loop bandwidth than unity-gain op amps while maintaining phase margin >45° |
| 100dB SFDR at 1MHz | Supports clean digitization of narrowband IF signals in spectrum analyzers and software-defined radios |
| 63ns 16-bit settling | Meets timing budget for 16-bit ADCs operating at ≥15MSPS without acquisition-time penalty |
| 2.8nV/√Hz input voltage noise | Minimizes added noise floor when amplifying sub-mV sensor outputs or low-level RF signals |
| ±60mA output drive | Eliminates need for external buffer stage when driving switched-capacitor ADC inputs with 10–50pF loading |
Applications
| High-Speed ADC Preamplifier | IF Amplifier |
|---|---|
Use Scenario: Driving the analog input of a 16-bit, 20MSPS pipeline ADC in a medical ultrasound receiver. IC Role / Device Role / Timing Role: Precision gain-stage amplifier with fast settling and low harmonic distortion to preserve echo signal fidelity. Use Value: 63ns settling ensures full 16-bit accuracy per sample; 100dB SFDR prevents intermodulation masking weak echo returns. |
Use Scenario: Amplifying 70MHz IF signals in a satellite communications downconverter. IC Role / Device Role / Timing Role: Low-noise, wideband voltage amplifier in fixed-gain IF strip prior to quadrature demodulation. Use Value: 215MHz bandwidth supports 20MHz channel bandwidth; 2.8nV/√Hz noise density maintains C/N ratio above system threshold. |
| Low-Distortion Active Filter | Precision Instrumentation Front-End |
Use Scenario: Implementing a 4th-order Butterworth anti-aliasing filter preceding a high-speed data acquisition system. IC Role / Device Role / Timing Role: High-linearity active filter section using Sallen-Key topology with precise gain and phase response. Use Value: Ultra-low THD (< −100dB) prevents harmonic folding into baseband; 145V/µs slew rate avoids slew-induced distortion on composite waveforms. |
Use Scenario: Signal conditioning stage for a portable gas chromatography analyzer requiring 16-bit resolution over 4-decade dynamic range. IC Role / Device Role / Timing Role: Low-drift, low-noise gain block interfacing MEMS sensor output to successive-approximation ADC. Use Value: 110dB min open-loop gain ensures <0.001% gain error; ±60mA drive handles variable capacitive load of sensor cable and multiplexer. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-distortion op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8009ARZ | Unity-gain stable (1 GHz GBW), higher supply current (17mA), lower noise (1.2nV/√Hz), SO-8 package | Better for wideband unity-gain buffers; less suitable for fixed +2V/V gain stages due to instability risk | Select AD8009ARZ only if unity-gain operation or >500MHz bandwidth is required; verify stability with exact feedback network |
| LMH6629MA/NOPB | +5V/V minimum stable gain, 1.5GHz GBW, 2.7nV/√Hz noise, SO-8 package, higher quiescent current (14.5mA) | Optimized for very high closed-loop gains (>+5V/V); not recommended for +2V/V configurations without external compensation | Choose LMH6629MA/NOPB for gain ≥+5V/V applications needing >1GHz bandwidth; MAX4431ESA+ remains preferred for +2V/V precision ADC driving |
Compared with AD8009ARZ and LMH6629MA/NOPB, the MAX4431ESA+ offers superior trade-off between +2V/V stability margin, 63ns 16-bit settling, and 11mA power consumption - making it uniquely suited for cost- and power-sensitive high-resolution ADC driver designs where gain is fixed at +2V/V.
Availability
The MAX4431ESA+ is available at Aetrix Electronics and suitable for high-speed data acquisition, precision instrumentation, and communications receiver designs requiring stable component supply, long-term manufacturability, and traceable sourcing.
Supply support for MAX4431ESA+ 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, communications, and computing applications.
The MAX4430–MAX4433 family was designed specifically to address the signal integrity challenges of driving modern 14- and 16-bit ADCs - emphasizing speed, low distortion, and robust capacitive-load driving capability in compact packages.
FAQ
What is the minimum stable closed-loop gain for the MAX4431ESA+?
The MAX4431ESA+ is internally compensated for closed-loop gains of +2V/V or greater. Operating at gains below +2V/V may result in peaking, ringing, or oscillation due to insufficient phase margin. For unity-gain or variable-gain applications, the MAX4430ESA+ variant should be selected instead. Always verify stability under actual load conditions using AC analysis or bench measurement.
Can the MAX4431ESA+ drive a 50Ω transmission line directly?
The MAX4431ESA+ is not designed for direct 50Ω line driving: its output stage delivers ±60mA into 500Ω but cannot sustain continuous 100mA into 50Ω without thermal overload or distortion. For 50Ω interface, use a series 45Ω resistor to isolate the op amp and match impedance - this preserves signal integrity while protecting the MAX4431ESA+ output stage from excessive current demand.
Does the MAX4431ESA+ support single-supply operation?
No - the MAX4431ESA+ is specified exclusively for dual-supply operation from ±4.5V to ±5.5V. Its input common-mode range (VEE + 2.5V to VCC – 0.9V) and output swing (VEE + 2.6V to VCC – 0.6V) require symmetric rails to achieve full dynamic range. Attempting single-supply use will result in clipping, reduced headroom, and potential phase reversal near rail limits.
What is the maximum capacitive load the MAX4431ESA+ can drive without external isolation?
The MAX4431ESA+ remains stable with up to 47pF of capacitive load at the output when driving a 500Ω load, as confirmed by production testing. Beyond 47pF, output ringing or sustained oscillation may occur. For loads >47pF (e.g., ADC input capacitance + PCB trace), add a 5Ω–22Ω series isolation resistor between the MAX4431ESA+ output and the load to restore phase margin without significantly degrading DC gain.
How does the MAX4431ESA+ differ from the MAX4430ESA+ in practical circuit design?
The MAX4431ESA+ requires minimum +2V/V closed-loop gain and achieves 215MHz bandwidth and 145V/µs slew rate, whereas the MAX4430ESA+ is unity-gain stable with 180MHz bandwidth and 100V/µs slew rate. In practice, this means the MAX4431ESA+ delivers faster settling (63ns vs. 37ns at 16-bit) only when configured for gain ≥+2V/V - and cannot replace the MAX4430ESA+ in unity-gain follower or attenuator applications without risking instability.
MAX4431ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 145V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 215 MHz
- Current - Input Bias:
- 11 µA
- Voltage - Input Offset:
- 1.25 mV
- Current - Supply:
- 11mA
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 11 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4431ESA+ FAQ
1.How can I place an order for MAX4431ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4431ESA+ 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 MAX4431ESA+ reliable?
The price and inventory of MAX4431ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4431ESA+ is usually 5 days.
3.What payment methods are accepted for MAX4431ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4431ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4431ESA+?
MAX4431ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4431ESA+ 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 MAX4431ESA+?
For technical support, including MAX4431ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4431ESA+ requirements.
6.How does Aetrix verify that MAX4431ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX4431ESA+ 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 MAX4431ESA+ meets industry standards.
7.What is the process for return or replacement of MAX4431ESA+?
All MAX4431ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4431ESA+, 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 MAX4431ESA+ part is unused and in its original packaging.
Return procedure for MAX4431ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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