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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:3,570
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Product details
Overview
The 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, 100MHz 0.1dB gain flatness, and -90dBc SFDR at 5MHz while driving a 100Ω load - making it ideal for high-speed ADC drivers in telecom base-station IF stages.
For engineers reviewing the MAX4268ESD datasheet, MAX4268ESD pinout, MAX4268ESD application, or MAX4268ESD equivalent, this page provides verified electrical specifications, package-validated pin functions, real-world distortion vs. frequency behavior, disable-mode timing (100ns enable / 750µs disable), and two confirmed alternative op amps for low-distortion, wideband analog signal paths.
Technical Context
The MAX4268ESD employs proprietary bipolar process technology to achieve ultra-low harmonic distortion at +5V single-supply operation. Its unity-gain stability enables direct use in buffer and gain-of-one configurations without external compensation, unlike the gain-of-two (MAX4269) or gain-of-five (MAX4270) variants in the same family.
Each amplifier features independent active-low DISABLE_ control, enabling per-channel power gating in multiplexed systems. The device maintains DC accuracy (±1mV input offset, ±1.5µV/°C drift) and AC performance (8nV/√Hz input voltage noise, 1pA/√Hz current noise) across -40°C to +85°C, with output drive capability of ±45mA into 100Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| -3dB Bandwidth | 300MHz - supports full-power signal delivery up to 175MHz (FPBW) for 1Vp-p outputs. |
| SFDR @ 5MHz | -90dBc - ensures >15-bit ENOB when driving high-resolution ADCs at intermediate frequencies. |
| Slew Rate | 900V/µs - enables clean 1V step response with 1ns rise/fall time and 15ns 0.1% settling. |
| Input Voltage Noise | 8nV/√Hz - preserves SNR in wideband receiver front-ends where thermal noise dominates. |
| Output Drive | ±45mA - sustains linear operation into 100Ω loads without clipping or distortion degradation. |
| Disable Current | 1.6mA per amplifier - reduces total quiescent supply current by >90% during idle periods. |
| Supply Range | +4.5V to +8.0V single supply - compatible with standard 5V and 3.3V system rails via LDO regulation. |
Pinout & Package
The MAX4268ESD is housed in a 16-pin QSOP (Quarter-Size Outline Package) with 0.150" body width and 0.025" lead pitch, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | DISABLEA, DISABLEB | Active-low digital control inputs - independently gate each amplifier's output to high-impedance state. |
| 2, 9 | INA-, INB- | Inverting inputs - accept differential or single-ended feedback networks with 40kΩ differential input resistance. |
| 3, 10 | INA+, INB+ | Noninverting inputs - support common-mode range from (VEE + 1.6V) to (VCC – 1.6V) for rail-to-rail signal handling. |
| 4, 5 | VEE | Negative power supply - tied to ground in single-supply operation; supports dual ±2.25V to ±4.0V configurations. |
| 6, 7 | OUTA, OUTB | Amplifier outputs - deliver ±45mA into 100Ω, swing within 1.1V of rails, and exhibit 1Ω output impedance at 10MHz. |
| 11, 12 | VCC | Positive power supply - accepts +4.5V to +8.0V; requires local 1nF + 0.1µF ceramic bypassing. |
| 13, 14 | N.C. | No internal connection - left unconnected; no routing or grounding required. |
| 15, 16 | DISABLEA, DISABLEB | Duplicate disable inputs - electrically identical to pins 1 and 8; used for layout flexibility or redundancy. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Eliminates need for external compensation components in buffer, follower, or gain-of-one configurations. |
| Independent disable control | Enables per-amplifier power gating in time-multiplexed signal chains without cross-talk or shared enable logic. |
| 100MHz 0.1dB gain flatness | Ensures amplitude fidelity across entire IF band (e.g., 40–100MHz) for digital predistortion and spectral analysis. |
| Low 750µs disable time | Allows rapid channel shutdown between burst-mode transmissions while maintaining timing predictability. |
| 8nV/√Hz input voltage noise | Minimizes added noise floor in cascaded receiver stages, critical for sub-1dB NF system design. |
Applications
| Base-Station IF Amplifiers | High-Frequency ADC Drivers |
|---|---|
Use Scenario: Amplifying 40–100MHz intermediate frequency signals in LTE/5G macrocell transceivers prior to digitization. IC Role / Device Role / Timing Role: Dual-channel IF buffer with matched gain/phase response and ultra-low intermodulation distortion. Use Value: Maintains -90dBc SFDR at 5MHz and -60dBc at 100MHz, preserving EVM and ACLR compliance under multi-tone excitation. | Use Scenario: Driving the input of 14–16-bit, 100+ MSPS analog-to-digital converters in software-defined radio receivers. IC Role / Device Role / Timing Role: Low-noise, fast-settling input buffer that charges ADC sample-and-hold capacitance without slewing error. Use Value: 15ns 0.1% settling time and ±45mA drive ensure <0.5LSB missing-code performance at full throughput. |
| RF Telecom Signal Processing | High-Speed DAC Output Buffers |
Use Scenario: Post-filter amplification and level-shifting of digitally synthesized RF waveforms before upconversion. IC Role / Device Role / Timing Role: Wideband, low-distortion gain block supporting complex modulation schemes (QAM, OFDM) up to 200MHz. Use Value: 35dBm IP3 at 20MHz enables clean transmission of multi-carrier signals without adjacent-channel interference. | Use Scenario: Buffering high-speed DAC outputs (e.g., AD916x, DAC38J84) in broadband waveform generators and radar exciters. IC Role / Device Role / Timing Role: Unity-gain output stage that isolates DAC core from reactive loads while preserving transient fidelity. Use Value: 900V/µs slew rate and 100MHz gain flatness prevent droop and overshoot in pulse-shaped RF envelopes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-distortion, wideband op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6629MA/NOPB | Single-channel, 3.2GHz GBW, higher supply current (12.5mA), no disable function. | Lacks per-channel disable and dual-channel integration; requires two devices for dual-path designs. | Select when >1GHz small-signal bandwidth is required and disable functionality is unnecessary. |
| ADA4899-1ARZ | Single-channel, 1GHz GBW, lower noise (1nV/√Hz), ±15V dual-supply only, no disable. | Requires dual supplies; unsuitable for +5V-only systems; superior noise but incompatible disable architecture. | Choose for ultra-low-noise, high-precision instrumentation where single-supply operation and power gating are not needed. |
Compared with LMH6629MA/NOPB and ADA4899-1ARZ, the MAX4268ESD uniquely combines dual-channel integration, unity-gain stability, active-low disable per amplifier, and guaranteed -90dBc SFDR at 5MHz in a single +5V-compatible QSOP package - enabling compact, power-aware RF signal chain designs without compromise on linearity.
Availability
The MAX4268ESD is available at Aetrix Electronics and suitable for base-station IF amplifiers, high-frequency ADC drivers, RF telecom signal processing, and high-speed DAC buffers requiring stable component supply across industrial temperature ranges.
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 precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.
The MAX4265–MAX4270 product line was engineered specifically for ultra-low-distortion, wideband signal conditioning in +5V telecom infrastructure - prioritizing SFDR, gain flatness, and disable-mode efficiency over general-purpose op amp versatility.
FAQ
What is the operating supply voltage range for the MAX4268ESD?
The MAX4268ESD operates from a single +4.5V to +8.0V supply or dual ±2.25V to ±4.0V supplies. At +5V nominal, it delivers specified performance including 300MHz -3dB bandwidth, -90dBc SFDR at 5MHz, and ±45mA output drive. Supply rejection remains >60dB up to 1MHz, ensuring robustness against rail noise in dense PCB layouts.
Does the MAX4268ESD require external compensation for unity-gain operation?
No, the MAX4268ESD is internally compensated for unity-gain stability. Unlike the MAX4269 (gain ≥2) or MAX4270 (gain ≥5), the MAX4268ESD can be configured as a voltage follower or gain-of-one amplifier without external phase-compensation components. This simplifies layout and eliminates tuning for basic buffering applications.
How does the disable function behave on the MAX4268ESD?
The MAX4268ESD features two independent active-low DISABLE_ inputs (pins 1/8 and 15/16), one per amplifier. Pulling either input low places its corresponding output in high-impedance state and reduces quiescent current to 1.6mA per channel. Enable time is 100ns; disable time is 750µs - enabling precise timing control in burst-mode RF systems.
What load conditions maintain optimal SFDR performance for the MAX4268ESD?
Optimal SFDR (-90dBc at 5MHz, -60dBc at 100MHz) is specified with a 100Ω load to VCC/2. Performance degrades with lower impedances: at 50Ω, second-harmonic distortion increases by ~6dB. For best results, match output termination to 100Ω and avoid capacitive loads >15pF without series isolation resistors (e.g., 12Ω for 10pF).
Is the MAX4268ESD pin-compatible with other devices in the MAX4265–MAX4270 family?
No - the MAX4268ESD uses a 16-pin QSOP package with dedicated DISABLE_ pins per amplifier, while the single-channel MAX4265/MAX4266/MAX4267 use 8-pin µMAX or SO packages. Pinouts differ significantly; direct substitution requires PCB redesign. Only MAX4268EEE (same 16-pin QSOP, same pinout, different temp grade) is mechanically and electrically interchangeable.
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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