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Analog Devices Inc./Maxim Integrated MAX4268ESD+
- Part No.:
- MAX4268ESD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4268ESD+.pdf
- Description:
- IC OPAMP VFB 2 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,894
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Product details
Overview
MAX4268ESD+ from Maxim Integrated is a dual, unity-gain stable, ultra-low-distortion voltage-feedback operational amplifier optimized for high-frequency signal conditioning. It delivers 900V/µs slew rate, 300MHz -3dB bandwidth, and -90dBc SFDR at 5MHz into 100Ω - enabling precision ADC driving and RF telecom IF amplification in single-supply +4.5V to +8.0V systems.
For engineers reviewing the MAX4268ESD+ datasheet, MAX4268ESD+ pinout, MAX4268ESD+ application, or MAX4268ESD+ equivalent, this page provides verified electrical specifications, QSOP-16 package layout, disable-mode timing, distortion vs. load data, and validated alternatives for high-speed analog signal chain design.
Technical Context
The MAX4268ESD+ employs proprietary bipolar process technology to achieve ultra-low harmonic distortion while maintaining DC accuracy and rail-to-rail output swing capability (±1.1V from rails). Its unity-gain stability eliminates external compensation requirements in buffer and gain-of-one configurations.
Each amplifier features independent active-low DISABLE_ control with 100ns enable time and 750µs disable time, placing outputs in high-impedance state and reducing quiescent current to 1.6mA per channel. Input voltage noise density is 8nV/√Hz at 1kHz, and input common-mode range extends from (VEE + 1.6V) to (VCC – 1.6V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| -3dB Bandwidth | 300MHz - supports wideband IF and baseband signal paths up to UHF frequencies. |
| Slew Rate | 900V/µs - enables clean 1Vp-p step response with 1ns rise/fall time and 15ns 0.1% settling. |
| SFDR @ 5MHz | -90dBc into 100Ω - ensures minimal spurious content in high-dynamic-range ADC driver applications. |
| Input Voltage Noise | 8nV/√Hz at 1kHz - preserves SNR in low-level signal amplification stages before digitization. |
| Output Drive | ±45mA - sustains full 1Vp-p swing into 100Ω loads without clipping or distortion degradation. |
| Supply Range | +4.5V to +8.0V single supply - simplifies power architecture in +5V or +7.5V systems without dual-rail generation. |
| Disable Current | 1.6mA per amplifier - reduces total system power by >90% during idle or multiplexed operation. |
Pinout & Package
The MAX4268ESD+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), rated for -40°C to +85°C operation. Thermal resistance θJA is 8.33mW/°C above +70°C (667mW max continuous dissipation at +70°C).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | DISABLEA, DISABLEB | Active-low disable inputs - independently place each amplifier output in high-Z state; logic-compatible with 0V–VCC levels. |
| 2, 9 | INA-, INB- | Inverting inputs - accept differential or single-ended signals; CMVR = (VEE + 1.6V) to (VCC – 1.6V). |
| 3, 10 | INA+, INB+ | Noninverting inputs - high-impedance (40kΩ diff, 1MΩ cm) nodes requiring careful PCB layout to minimize capacitive coupling. |
| 4, 5 | VCC | Positive supply pin - bypass with 1nF ceramic in parallel with 0.1µF–1µF capacitor near pin for broadband decoupling. |
| 6, 7 | VEE | Negative supply pin - connect directly to ground in single-supply operation; supports dual ±2.25V to ±4.0V. |
| 11, 12 | OUTA, OUTB | Amplifier outputs - deliver ±45mA into 100Ω; output swing limited to VEE + 1.75V to VCC – 1.75V (typical). |
| 13, 14 | N.C. | No internal connection - leave unconnected; no routing or grounding required. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable architecture | Eliminates need for external compensation in gain-of-one buffers, reducing BOM count and layout complexity. |
| Independent disable control per channel | Enables time-multiplexed signal routing or power-gating of unused amplifiers in dual-channel systems. |
| 100Ω load drive capability | Maintains -90dBc SFDR at 5MHz and -60dBc at 100MHz - critical for direct interface to ADC/DAC termination networks. |
| Low 8nV/√Hz input voltage noise | Preserves dynamic range in front-end amplification stages where thermal noise dominates system SNR. |
| 175MHz full-power bandwidth | Supports 1Vp-p large-signal fidelity up to 175MHz - suitable for high-speed DAC output buffering and video line drivers. |
Applications
| Base-Station IF Amplifier | High-Frequency ADC Driver |
|---|---|
Use Scenario: Amplifying 70MHz–250MHz intermediate frequency signals in LTE/WCDMA basestation receivers prior to digitization. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain block providing 12dB fixed gain with <0.03° phase error across channel bandwidth. Use Value: -90dBc SFDR at 5MHz and -60dBc at 100MHz prevents intermodulation artifacts from corrupting adjacent channel measurements. |
Use Scenario: Buffering analog inputs to 14-bit, 105MSPS ADCs in radar and communications test equipment. IC Role / Device Role / Timing Role: High-slew-rate unity-gain follower ensuring fast settling (<15ns, 0.1%) and minimal THD+N (<0.005%) at Nyquist frequency. Use Value: 900V/µs slew rate and 175MHz FPBW maintain signal integrity for 1Vp-p full-scale steps without slewing-induced distortion. |
| RF Telecom Signal Processing | High-Speed DAC Output Buffer |
Use Scenario: Conditioning I/Q modulator outputs in microwave backhaul transceivers operating up to 2.5GHz carrier frequencies. IC Role / Device Role / Timing Role: Wideband differential driver delivering matched gain/phase to balanced mixer inputs with >85dB crosstalk rejection at 10MHz. Use Value: 85dB all-hostile crosstalk and 0.1dB gain flatness over 100MHz ensure amplitude/phase coherence between I and Q paths. |
Use Scenario: Isolating and amplifying current-output DACs (e.g., AD9789) feeding 50Ω transmission lines in software-defined radio front ends. IC Role / Device Role / Timing Role: Single-supply current-to-voltage converter with rail-swing capability and disable mode for burst-mode transmission. Use Value: ±45mA output drive sustains 1Vp-p into 50Ω loads; 750µs disable time allows precise gating of DAC output bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-distortion op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6629MA/NOPB | Single-channel, 3.2GHz GBW, higher 1.4nV/√Hz noise, no disable function, SOIC-8 package. | Lacks dual-channel integration and power-down mode; requires two units for dual-path designs. | Select when >1GHz small-signal bandwidth is required and disable functionality is unnecessary. |
| ADA4898-2ARZ | Dual-channel, 290MHz -3dB BW, lower 1.1nV/√Hz noise, ±3.5V min dual supply, no disable pin. | Requires dual ±3.5V supplies; lacks active disable and 100Ω load drive specification. | Prefer for ultra-low-noise, low-distortion applications with dual-supply infrastructure and no power-gating needs. |
Compared with LMH6629MA/NOPB and ADA4898-2ARZ, the MAX4268ESD+ uniquely combines dual-channel unity-gain stability, integrated disable control, 100Ω load drive with -90dBc SFDR, and single +4.5V–+8.0V operation - making it optimal for space-constrained, power-aware, wideband analog signal chains.
Availability
MAX4268ESD+ is available at Aetrix Electronics and suitable for RF telecom infrastructure, high-speed data acquisition, and precision instrumentation requiring stable component supply and guaranteed long-term manufacturability.
Supply support for MAX4268ESD+ 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) designs high-performance analog and mixed-signal ICs for demanding signal-chain, power, and interface applications.
The MAX4265–MAX4270 family was engineered specifically for ultra-low-distortion, wideband amplification in +5V telecom and instrumentation systems - prioritizing SFDR, slew rate, and load drive over ultra-low power or rail-to-rail input.
FAQ
What is the maximum load capacitance the MAX4268ESD+ can drive without external isolation?
The MAX4268ESD+ maintains stability with capacitive loads up to 15pF and less than 2dB peaking in frequency response. For larger loads (e.g., 100pF coaxial cable), a series isolation resistor (e.g., 12Ω for CL = 10pF) must be placed between the output and load to preserve phase margin. This requirement is confirmed in Figure 2 and Figures 4a–4c of the official datasheet.
Does the MAX4268ESD+ support dual-supply operation, and what are the limits?
Yes, the MAX4268ESD+ operates from dual ±2.25V to ±4.0V supplies, with absolute maximum supply voltage (VCC to VEE) limited to +8.5V. Operation at ±3.3V or asymmetric supplies (e.g., VCC = +5V, VEE = -3V) is valid and used in video signal applications requiring negative pulse swing. The device's input common-mode range extends to (VEE + 1.6V) to (VCC – 1.6V) under all supply conditions.
How does the disable function affect output impedance and settling behavior of the MAX4268ESD+?
When DISABLE_ is pulled low, the MAX4268ESD+ places its outputs in a true high-impedance state (not just tri-state), with leakage current ≤2.5µA and disabled output capacitance of 5pF. Enable time is 100ns (typ), and disable time is 750µs (typ); these values are measured with VIN = +1V step and define the minimum dead time between channel activation cycles in multiplexed systems using MAX4268ESD+.
What is the guaranteed SFDR performance of the MAX4268ESD+ at 100MHz, and under what test conditions?
The MAX4268ESD+ guarantees -60dBc SFDR at fC = 100MHz, measured with VOUT = 1Vp-p, RL = 100Ω to VCC/2, AV = +1V/V, VCC = +5V, VEE = 0V, and TA = +25°C. This value is specified in the AC Electrical Characteristics table on page 4 of the datasheet and reflects performance in unity-gain configuration driving a matched resistive load.
Can the MAX4268ESD+ drive a 50Ω load while maintaining its specified distortion performance?
No - the MAX4268ESD+'s distortion specifications (SFDR, THD) are characterized exclusively into 100Ω loads per the datasheet. Driving 50Ω increases output current demand and degrades SFDR by ~3–6dB depending on frequency; for 50Ω interfaces, external series matching or buffer stage redesign is required. The 100Ω load condition is explicitly defined in all AC test conditions (e.g., "RL = 100Ω to VCC/2").
MAX4268ESD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 900V/µs
- Gain Bandwidth Product:
- 300 MHz
- -3db Bandwidth:
- 300 MHz
- Current - Input Bias:
- 3.5 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 28mA (x2 Channels)
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 8 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MAX4268ESD+ FAQ
1.How can I place an order for MAX4268ESD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4268ESD+ 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 MAX4268ESD+ reliable?
The price and inventory of MAX4268ESD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4268ESD+ is usually 5 days.
3.What payment methods are accepted for MAX4268ESD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4268ESD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4268ESD+?
MAX4268ESD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4268ESD+ 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 MAX4268ESD+?
For technical support, including MAX4268ESD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4268ESD+ requirements.
6.How does Aetrix verify that MAX4268ESD+ is sourced from the original manufacturer or authorized distributors?
All MAX4268ESD+ 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 MAX4268ESD+ meets industry standards.
7.What is the process for return or replacement of MAX4268ESD+?
All MAX4268ESD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4268ESD+, 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 MAX4268ESD+ part is unused and in its original packaging.
Return procedure for MAX4268ESD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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