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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:4,335
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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. It delivers 250MHz -3dB bandwidth, 350V/µs slew rate, and 6ns (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-ideal for multiplexed high-speed data acquisition systems.
For engineers reviewing the MAX4285EUT-T datasheet, MAX4285EUT-T pinout, MAX4285EUT-T application, or MAX4285EUT-T equivalent, key selection criteria include unity-gain stability, 250MHz small-signal bandwidth at +3V, high-output drive (±77mA/–106mA), low distortion (88dBc SFDR @ 5MHz), and SOT23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4285EUT-T is internally compensated for unity-gain stability and features a dedicated active-low DISABLE pin that enables fast switching (40ns enable / 50ns disable) between active and high-Z states. Its input common-mode range extends to VEE (ground in single-supply mode), supporting rail-to-rail input operation below the negative rail.
Designed specifically for driving SAR and pipeline ADCs, it maintains linear output swing from (VEE + 0.4V) to (VCC – 0.4V) and achieves 88dBc spurious-free dynamic range at 5MHz with 300Ω load-critical for maintaining ENOB in 12–14-bit converter interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| -3dB Bandwidth | 250MHz at AV = +1V/V - supports wideband signal conditioning up to Nyquist of ≥125MSPS ADCs |
| Slew Rate | 350V/µs - enables full-scale step response without slewing distortion for >1Vpp signals |
| Settling Time | 6ns to 0.1% - meets timing budget for ≥160MSPS sampling with minimal acquisition window overhead |
| Supply Range | +2.85V to +6.5V single supply - compatible with 3.3V and 5V system rails without level-shifting |
| Output Drive | –106mA sink / +77mA source - directly drives low-impedance ADC inputs including switched-capacitor sampling networks |
| SFDR | 88dBc @ fC = 5MHz, RL = 300Ω - preserves dynamic range in communications and instrumentation front-ends |
| Disable Current | 1mA per amplifier - reduces power by >95% during idle/multiplexing intervals |
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 IN+, Pin 2 is IN–, Pin 3 is OUT, Pin 4 is VEE (ground in single-supply), Pin 5 is DISABLE (active-low), and Pin 6 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN+) | Noninverting Input | High-impedance node accepting analog input; common-mode range extends to VEE |
| 2 (IN–) | Inverting Input | Feedback node; supports inverting/noninverting configurations with external resistors |
| 3 (OUT) | Amplifier Output | Low-impedance, high-current output capable of driving 300Ω loads with minimal distortion |
| 4 (VEE) | Negative Supply / Ground | Reference for single-supply operation; must be connected to system ground |
| 5 (DISABLE) | Active-Low Disable Control | Pulls output to high-Z (typ. 35kΩ) when logic low; enables fast channel switching in multiplexer designs |
| 6 (VCC) | Positive Supply | Accepts +2.85V to +6.5V; requires local 0.1nF + 0.1µF bypassing for RF stability |
Key Features
| Feature | Design Value |
|---|---|
| Unity-Gain Stable Architecture | Internally compensated for AV ≥ +1V/V - eliminates need for external compensation in most ADC buffer layouts |
| High-Speed Enable/Disable | 40ns enable / 50ns disable - supports time-multiplexed sampling at >10MHz channel rates |
| Rail-to-Rail Input Capability | Input common-mode range includes VEE - simplifies DC-coupled interface to baseband signals |
| Low Distortion at High Frequency | 88dBc SFDR @ 5MHz - maintains ENOB in demanding IF sampling and direct-conversion receivers |
| Space-Saving SOT23-6 Package | 2.9mm × 1.6mm footprint - enables dense placement near ADC inputs to minimize trace inductance |
Applications
| High-Speed Data Acquisition | Communications Front-End |
|---|---|
Use Scenario: Multiplexed 14-bit, 100MSPS ADC system acquiring from eight sensor channels. IC Role / Device Role / Timing Role: ADC input buffer with per-channel disable control to isolate inactive channels and prevent crosstalk. Use Value: 50ns disable time ensures clean channel isolation; 35kΩ disabled output impedance prevents loading of adjacent channels. | Use Scenario: IF sampling stage in LTE base station receiver processing 20MHz bandwidth signals. IC Role / Device Role / Timing Role: Single-ended to differential driver preceding a 12-bit, 160MSPS pipeline ADC. Use Value: 250MHz bandwidth and 88dBc SFDR preserve signal integrity across full 20MHz channel bandwidth. |
| Ultrasound Beamforming | CCD Imaging Interface |
Use Scenario: Analog front-end for 128-channel ultrasound transducer array with time-delayed sampling. IC Role / Device Role / Timing Role: Low-noise, fast-settling buffer amplifying echo return signals before digitization. Use Value: 6ns settling time enables precise time-of-flight measurement; 10nV/√Hz input noise minimizes SNR degradation. | Use Scenario: Pixel clock-synchronized signal conditioning for interline-transfer CCD output. IC Role / Device Role / Timing Role: High-current buffer driving 75Ω coaxial cable to ADC with minimal droop on pixel pulses. Use Value: ±106mA output drive sustains flat response on 75Ω loads; 350V/µs slew rate preserves sharp pixel edges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4286EUT-T | Compensated for AV ≥ +5V/V only; 150MHz bandwidth; same SOT23-6 package and disable timing | Requires minimum gain of +5V/V; unsuitable for unity-gain ADC buffers | Select MAX4286EUT-T only when fixed-gain ≥5 configuration is acceptable and bandwidth margin allows |
| THS4561IRUGR | Single-ended-to-differential driver; 1.8GHz GBW; no disable function; 3mm × 3mm WQFN-10 package | Designed for differential ADC inputs; lacks high-Z disable for multiplexing | Choose THS4561IRUGR when differential signaling and higher bandwidth outweigh need for channel disable |
Compared with MAX4286EUT-T, MAX4285EUT-T supports unity-gain stability and higher bandwidth-essential for direct-drive ADC applications. Versus THS4561IRUGR, it trades differential output and extreme bandwidth for integrated disable control and compact SOT23-6 footprint in single-ended systems.
Availability
MAX4285EUT-T is available at Aetrix Electronics and suitable for high-speed data acquisition, communications infrastructure, and medical imaging systems requiring stable component supply with guaranteed long-term 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 precision analog, mixed-signal, and high-speed interface ICs for industrial, communications, and medical applications.
The MAX4285EUT-T belongs to Maxim's high-speed op amp product line, engineered specifically for driving modern high-resolution, high-sample-rate ADCs with minimal distortion and fast settling in compact, low-power form factors.
FAQ
What is the maximum supply voltage for MAX4285EUT-T?
The MAX4285EUT-T supports a maximum supply voltage of +7.5V across VCC–VEE. Absolute maximum ratings specify –0.3V to +7.5V for supply voltage, but recommended operating range is +2.85V to +6.5V single supply. Exceeding +6.5V risks parametric shift or reliability degradation, even if within absolute limits. Always refer to the MAX4285EUT-T datasheet for thermal derating curves in SOT23-6 package.
Does MAX4285EUT-T require external compensation components?
No, the MAX4285EUT-T is internally compensated for unity-gain stability (AV ≥ +1V/V), eliminating the need for external compensation capacitors in standard noninverting or inverting configurations. This simplifies layout and improves consistency across production units. However, for reactive loads >20pF, a 20Ω–30Ω series isolation resistor is recommended at the output to maintain phase margin and prevent ringing-per the MAX4285EUT-T application note on capacitive loading.
Can MAX4285EUT-T drive a 50Ω transmission line directly?
The MAX4285EUT-T is not designed for continuous 50Ω load driving: its specified output drive is optimized for 300Ω and 100Ω loads, with linear output swing limited to (VEE + 0.4V) to (VCC – 0.4V). Driving 50Ω continuously may cause thermal overload or clipping. For 50Ω interfaces, use a 25Ω series resistor to match impedance while preserving MAX4285EUT-T output voltage compliance and stability-verified in MAX4285EUT-T typical operating characteristics.
What is the input offset voltage drift over temperature for MAX4285EUT-T?
The MAX4285EUT-T has a guaranteed input offset voltage temperature coefficient (TCVOS) of 26µV/°C maximum, with typical value of 13µV/°C. Over the full –40°C to +85°C operating range, this results in ≤3.3mV total offset drift (26µV/°C × 125°C span). Measured data shows <1.5mV drift in typical units, making MAX4285EUT-T suitable for precision DC-coupled applications where offset stability matters-such as CCD bias control or sensor signal conditioning.
How does the DISABLE pin behave during power-up of MAX4285EUT-T?
During power-up, the MAX4285EUT-T DISABLE pin defaults to high-impedance until VCC reaches ~1.5V; thereafter, internal circuitry pulls DISABLE weakly high, keeping the amplifier enabled. To ensure predictable startup, tie DISABLE to VCC via a 10kΩ resistor or drive it actively. If left floating, noise coupling may cause unintended toggling. This behavior is documented in the MAX4285EUT-T functional description and verified in power-up transient testing per Maxim's application notes.
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:
- 106 mA
- 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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