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Analog Devices Inc./Maxim Integrated MAX4285EUT+T
- Part No.:
- MAX4285EUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4285EUT+T.pdf
- Description:
- IC BUFFER 1 CIRCUIT SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:3,227
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Product details
Overview
MAX4285EUT+T from Maxim Integrated is a single-channel, high-speed voltage-feedback operational amplifier optimized as an ADC input buffer for communications and instrumentation systems. It delivers 250MHz -3dB bandwidth, 350V/µs slew rate, and 8ns (to 0.1%) settling time while operating from a +2.85V to +6.5V single supply. Its disable feature reduces quiescent current to 1mA and places the output in high-impedance state - critical for multiplexed ADC front-ends.
For engineers reviewing the MAX4285EUT+T datasheet, MAX4285EUT+T pinout, MAX4285EUT+T application, or MAX4285EUT+T equivalent, this page provides verified electrical parameters, SOT23-6 package layout, disable timing (40ns enable / 50ns disable), SFDR of 88dBc at 5MHz, and real-world use cases in high-speed data acquisition systems requiring low distortion and rail-to-rail input common-mode range.
Technical Context
The MAX4285EUT+T is a unity-gain stable voltage-feedback op amp with internal compensation, designed specifically for driving high-resolution, high-sample-rate ADCs. Its input common-mode range extends to VEE (ground in single-supply mode), enabling direct interfacing with DC-coupled sensors and baseband signals.
It features active-low disable control (DISABLE pin), delivering 35kΩ typical output impedance when disabled, and supports dynamic load switching without signal contention. The device achieves 88dBc spurious-free dynamic range at 5MHz with 1Vp-p output into 300Ω, meeting demanding spectral purity requirements in RF sampling and medical imaging front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| -3dB Bandwidth | 250MHz at unity gain - enables accurate amplification of wideband IF/RF signals up to Nyquist frequency of 125MSPS ADCs. |
| Slew Rate | 350V/µs - supports full-scale step response without slewing distortion for 1Vp-p signals above 50MHz. |
| Settling Time | 8ns to 0.1% - ensures precise sampling window alignment in time-interleaved or pipeline ADC architectures. |
| SFDR | 88dBc at f = 5MHz - meets ENOB >12.5 bits for 14-bit ADC drivers in baseband instrumentation. |
| Supply Range | +2.85V to +6.5V single supply - compatible with 3.3V and 5V system rails without level-shifting circuitry. |
| Disable Current | 1mA per amplifier - reduces power by >95% during idle cycles in burst-mode data acquisition systems. |
| Output Drive | ±77mA / ±106mA sink-source - drives low-impedance ADC inputs (e.g., 50Ω differential termination) without external buffers. |
Pinout & Package
MAX4285EUT+T is housed in a 6-pin SOT23-6 package with exposed pad (thermal performance optimized for high-speed operation). Pin 1 is marked with dot; pin numbering follows standard SOT23 convention (counterclockwise from mark).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VEE (Ground) | Negative supply terminal - connects to system ground in single-supply configurations; sets input common-mode lower bound. |
| 2 | IN− | Inverting input - used in inverting gain configurations or differential-to-single-ended conversion with external feedback. |
| 3 | IN+ | Noninverting input - primary signal entry point for unity-gain buffer or noninverting amplifier topologies. |
| 4 | DISABLE | Active-low enable control - asserts high-impedance output state and reduces supply current to 1mA when pulled low. |
| 5 | VCC | Positive supply - accepts +2.85V to +6.5V; requires local 0.1nF + 0.1µF bypassing for stability at high frequencies. |
| 6 | OUT | Amplifier output - delivers rail-to-rail capable swing (VEE + 0.4V to VCC − 0.4V) into 300Ω loads. |
Key Features
| Feature | Design Value |
|---|---|
| High-speed disable | 40ns enable / 50ns disable timing with 35kΩ output impedance - enables seamless channel multiplexing in multi-sensor ADC systems. |
| Rail-to-rail input common-mode | Extends to VEE (ground) - eliminates need for level-shifting when interfacing with single-ended sensors or DAC outputs. |
| Low distortion at 5MHz | 88dBc SFDR - preserves signal integrity in wideband communication receivers and ultrasound beamforming front-ends. |
| Unity-gain stable | No external compensation required - simplifies PCB layout and reduces BOM count in compact ADC reference designs. |
| Single-supply operation | +2.85V to +6.5V range - supports direct integration into 3.3V FPGA I/O banks and 5V analog subsystems without regulators. |
Applications
| High-Speed Data Acquisition | Communications Baseband |
|---|---|
|
Use Scenario: Driving the analog input of a 125MSPS 14-bit pipeline ADC in a software-defined radio receiver. IC Role / Device Role / Timing Role: ADC buffer amplifier providing gain-of-1 signal conditioning, settling within 8ns to meet aperture jitter and sampling window constraints. Use Value: 88dBc SFDR at 5MHz ensures >12.5 ENOB, preserving dynamic range across 20MHz instantaneous bandwidth. |
Use Scenario: Conditioning baseband I/Q signals prior to digitization in LTE femtocell transceivers. IC Role / Device Role / Timing Role: Single-supply, rail-to-rail input buffer isolating DAC output from ADC input in zero-IF architecture. Use Value: Input common-mode range to ground allows direct interface with 0–1.8V DAC outputs without level shifters. |
| Ultrasound Beamforming | Test & Measurement Equipment |
|
Use Scenario: Buffering echo signals from 128-channel phased-array transducer elements before time-domain multiplexing. IC Role / Device Role / Timing Role: High-Z disable-enabled channel selector - one MAX4285EUT+T per channel, enabled only during its time slot. Use Value: 35kΩ disabled output impedance prevents crosstalk between active/inactive channels in dense analog mux arrays. |
Use Scenario: Front-end signal conditioning in portable oscilloscope digitizers requiring 100+ MHz analog bandwidth. IC Role / Device Role / Timing Role: Low-noise, fast-settling amplifier driving 50Ω coaxial traces to ADC input with minimal group delay variation. Use Value: 250MHz small-signal bandwidth and 0.5ns group delay flatness over 100MHz ensure faithful waveform reproduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC buffer amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8009ARTZ-R7 | Higher 1GHz bandwidth but no disable function; 12mA quiescent current vs. 20mA normal / 1mA disabled for MAX4285EUT+T. | Lacks high-Z disable - unsuitable for multiplexed ADC inputs; better for continuous-sampling high-frequency signal chains. | Select AD8009ARTZ-R7 only when disable functionality is unnecessary and >500MHz bandwidth is required. |
| THS3201DBVR | 2.1GHz bandwidth, 5000V/µs slew rate, but requires dual ±5V supplies; no single-supply operation below ±2.5V. | Not compatible with 3.3V-only systems; higher power (125mW vs. 60mW typical for MAX4285EUT+T at 3V). | Choose THS3201DBVR for ultra-wideband (>1GHz) applications where dual supply is available and disable is not needed. |
Compared with AD8009ARTZ-R7 and THS3201DBVR, the MAX4285EUT+T uniquely balances 250MHz bandwidth, single-supply operation down to +2.85V, and sub-50ns disable timing - making it the only viable option for space-constrained, low-power, multiplexed high-speed ADC front-ends.
Availability
MAX4285EUT+T is available at Aetrix Electronics and suitable for high-speed data acquisition, communications baseband conditioning, and ultrasound beamforming applications requiring stable component supply, consistent parametric performance, and long-term production availability.
Supply support for MAX4285EUT+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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for precision, power, and interface applications.
The MAX4285EUT+T belongs to Maxim's high-speed op amp product line, engineered specifically for ADC driver applications demanding wide bandwidth, low distortion, and fast enable/disable control in compact form factors.
FAQ
What is the maximum operating supply voltage for MAX4285EUT+T?
The MAX4285EUT+T supports a single-supply range of +2.85V to +6.5V. Absolute maximum supply voltage (VCC – VEE) is +7.5V. Exceeding +6.5V risks violating internal bias conditions and may degrade AC performance or reliability. For robust 5V system integration, MAX4285EUT+T operates reliably at +5V with full 250MHz bandwidth and 350V/µs slew rate.
Does MAX4285EUT+T require external compensation components?
No, the MAX4285EUT+T is internally compensated for unity-gain stability. It does not require external capacitors or resistors for phase margin correction in gain ≥1 configurations. This simplifies layout and eliminates tuning steps - confirmed in the datasheet's "Detailed Description" section and validated across all production units.
What is the output impedance of MAX4285EUT+T when disabled?
When the DISABLE pin is pulled low, the MAX4285EUT+T output enters high-impedance state with typical impedance of 35kΩ. This value is specified in the Applications Information section and verified under RL = ∞, VCC = +3V, TA = +25°C. It enables clean signal routing in multiplexed ADC architectures without loading adjacent channels.
Can MAX4285EUT+T drive a 50Ω transmission line directly?
Yes - the MAX4285EUT+T delivers ±77mA source / ±106mA sink current and maintains linear operation up to VCC − 0.4V and VEE + 0.4V. When configured as a gain-of-1 buffer with 50Ω series termination at the output, it drives 50Ω coaxial traces to ADC inputs while preserving 250MHz bandwidth and <0.1% settling accuracy.
Is the input common-mode voltage range truly rail-to-rail on the negative side?
Yes - the MAX4285EUT+T input common-mode range extends to VEE (ground in single-supply mode), as guaranteed in the DC Electrical Characteristics table. This allows direct connection of 0V-referenced sensors or DAC outputs without level-shifting circuitry, reducing noise and component count in precision signal chains.
MAX4285EUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Buffer
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 385V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 220 MHz
- Current - Input Bias:
- 13 µA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 23mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.85 V
- Voltage - Supply Span (Max):
- 6.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX4285EUT+T FAQ
1.How can I place an order for MAX4285EUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4285EUT+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 MAX4285EUT+T reliable?
The price and inventory of MAX4285EUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4285EUT+T is usually 5 days.
3.What payment methods are accepted for MAX4285EUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4285EUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4285EUT+T?
MAX4285EUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4285EUT+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 MAX4285EUT+T?
For technical support, including MAX4285EUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4285EUT+T requirements.
6.How does Aetrix verify that MAX4285EUT+T is sourced from the original manufacturer or authorized distributors?
All MAX4285EUT+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 MAX4285EUT+T meets industry standards.
7.What is the process for return or replacement of MAX4285EUT+T?
All MAX4285EUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4285EUT+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 MAX4285EUT+T part is unused and in its original packaging.
Return procedure for MAX4285EUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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