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Analog Devices Inc./Maxim Integrated MAX4285ESA+
- Part No.:
- MAX4285ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4285ESA+.pdf
- Description:
- IC BUFFER 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,541
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Product details
Overview
MAX4285ESA+ 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 6ns (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, enabling multiplexing in high-speed data acquisition.
For engineers reviewing the MAX4285ESA+ datasheet, MAX4285ESA+ pinout, MAX4285ESA+ application, or MAX4285ESA+ equivalent, key selection criteria include unity-gain stability, ±106mA/±77mA output drive capability, 88dBc SFDR at 5MHz, input common-mode range extending to VEE (ground), and compatibility with space-constrained SO-8 layouts.
Technical Context
The MAX4285ESA+ is a unity-gain stable voltage-feedback op amp designed specifically for driving high-resolution, high-speed analog-to-digital converters. Its architecture supports rail-to-rail input common-mode range (down to VEE) and delivers linear output swing from (VEE + 0.4V) to (VCC – 0.4V) with 0.5Ω typical output impedance in active mode.
It features a fast enable/disable interface with 40ns enable and 50ns disable times, and its high-speed disable mode achieves <1mA quiescent current per amplifier while maintaining >35kΩ output impedance - critical for low-crosstalk signal routing in multiplexed ADC front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| -3dB Bandwidth | 250MHz at unity gain - enables accurate buffering 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 1Vpp signals within ≤2.8ns. |
| Settling Time | 6ns to 0.1% - ensures precise sampling window alignment for ≥160Msps ADCs with minimal aperture jitter contribution. |
| SFDR | 88dBc at f = 5MHz - meets dynamic range requirements for 14-bit+ ADC drivers in baseband and IF sampling applications. |
| Output Drive | –106mA sink / +77mA source - directly drives low-impedance, capacitive ADC inputs (e.g., MAX157) without external buffers. |
| Supply Range | +2.85V to +6.5V single supply - compatible with 3V and 5V system rails; input CMVR extends to VEE (0V). |
| Disable Current | 1mA per amplifier - reduces power by >95% during idle cycles in time-interleaved or channel-multiplexed systems. |
Pinout & Package
MAX4285ESA+ is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint (5.0mm × 6.2mm, 1.27mm pitch). Pin 1 is marked with a beveled corner or dot; pin numbering follows counterclockwise convention from top-left when viewed from component side.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN– | Inverting input - accepts differential or single-ended feedback networks; input bias current ≤8µA ensures low offset drift in precision gain stages. |
| 2 | IN+ | Noninverting input - common-mode range extends to VEE (0V), enabling ground-referenced sensor or DAC outputs. |
| 3 | OUT | Amplifier output - capable of ±106mA/±77mA drive into 20Ω loads; output impedance drops to 0.5Ω in active mode. |
| 4 | DISABLE | Active-low enable control - asserts high-impedance state (ZOUT >35kΩ) in <50ns; logic threshold VIL ≤ VCC–2V, VIH ≥ VCC–1V. |
| 5 | VEE | Negative supply or ground - must be connected to system ground in single-supply operation; supports dual ±1.425V to ±3.25V configurations. |
| 6 | N.C. | No internal connection - electrically isolated; may be left floating or tied to ground for mechanical stability. |
| 7 | VCC | Positive supply - bypass with 0.1nF ceramic + 0.1µF tantalum close to pin to suppress high-frequency noise coupling into sensitive analog path. |
| 8 | NC | No internal connection - identical to Pin 6; no electrical function; avoid routing signals underneath. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable architecture | Guarantees stable operation with AV = +1V/V configuration - eliminates need for external compensation in most ADC buffer designs. |
| High-speed disable interface | 40ns enable / 50ns disable timing - enables sub-100ns channel switching in time-division multiplexed data acquisition systems. |
| Input common-mode range to VEE | Supports DC-coupled inputs down to ground - simplifies interfacing with unipolar sensors, DACs, or baseband I/Q sources. |
| Low distortion at 5MHz | 88dBc SFDR - preserves ENOB in 14-bit ADC systems sampling at ≥20Msps without requiring post-processing correction. |
| Robust capacitive load drive | Stable with 22pF–47pF loads when using 20Ω–25Ω isolation resistor - accommodates PCB trace capacitance and ADC input parasitics. |
| Low input noise density | 10nV/√Hz at 1MHz - minimizes added noise floor in wideband receiver front-ends where SNR is signal-limited. |
Applications
| High-Speed ADC Drivers | Communications Equipment |
|---|---|
Use Scenario: Driving the analog input of a 14-bit, 105Msps pipeline ADC (e.g., MAX1127) in a software-defined radio receiver chain. IC Role / Device Role / Timing Role: ADC buffer amplifier providing gain-of-one signal conditioning, wideband settling, and low-distortion drive to meet SFDR and ENOB specs. Use Value: Enables direct coupling without AC coupling capacitors or level-shifting circuitry due to rail-to-rail input CMVR and 250MHz bandwidth. |
Use Scenario: Front-end signal conditioning for LTE baseband I/Q channels in small-cell femtocell transceivers. IC Role / Device Role / Timing Role: Single-supply ADC driver handling 0–30MHz complex baseband signals prior to digitization. Use Value: Delivers 88dBc SFDR at 5MHz while consuming only 20mA per channel - critical for thermal budget in compact RF modules. |
| Instrumentation | Ultrasound Imaging Systems |
Use Scenario: Buffering outputs of programmable-gain amplifiers in high-precision digital oscilloscope front-ends. IC Role / Device Role / Timing Role: High-fidelity unity-gain follower ensuring minimal phase shift and group delay variation across 100MHz bandwidth. Use Value: 6ns settling time and <0.5Ω output impedance maintain signal integrity during rapid vertical scale changes and trigger events. |
Use Scenario: Transmit beamformer channel driver feeding 5–15MHz pulsed ultrasound transducer arrays via multiplexed analog switches. IC Role / Device Role / Timing Role: High-current, fast-enable buffer enabling time-sliced excitation of individual transducer elements. Use Value: 40ns enable time and high-Z disable state allow precise inter-element dead-time control without crosstalk or ringing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC buffer amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8009ARZ | Higher 1GHz bandwidth but requires ±5V dual supply; no disable function; 12mA quiescent current. | Better for ultra-wideband (>500MHz) applications; unsuitable for battery-powered or multiplexed systems needing low-power disable. | Select AD8009ARZ only when bandwidth >500MHz is mandatory and disable functionality is unnecessary. |
| THS4509RGTT | Differential output architecture; 2GHz small-signal BW; requires external common-mode feedback; 22mA IQ. | Designed for driving differential-input ADCs (e.g., ADS41B49); not pin-compatible; needs layout redesign for single-ended use. | Choose THS4509RGTT when interfacing with high-performance differential ADCs and board space allows new layout. |
Compared with AD8009ARZ and THS4509RGTT, the MAX4285ESA+ offers unique integration of unity-gain stability, single-supply operation, and sub-50ns disable timing - making it optimal for cost-sensitive, space-constrained, and power-aware ADC front-ends where simplicity and reliability outweigh raw bandwidth.
Availability
MAX4285ESA+ is available at Aetrix Electronics and suitable for high-speed data acquisition, communications infrastructure, and medical ultrasound systems requiring stable component supply and long-term production continuity.
Supply support for MAX4285ESA+ 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 demanding industrial, communications, and medical applications.
The MAX4285ESA+ belongs to Maxim's high-speed precision op amp product line, engineered specifically for ADC driver applications requiring wide bandwidth, low distortion, and fast enable/disable control in compact form factors.
FAQ
What is the maximum recommended supply voltage for MAX4285ESA+?
The absolute maximum supply voltage (VCC – VEE) for MAX4285ESA+ is +7.5V. However, the specified operating range is +2.85V to +6.5V for single-supply use. Operating at 6.5V is permissible and supported across the full –40°C to +85°C temperature range, with all key parameters (e.g., bandwidth, SFDR) guaranteed per datasheet limits. Exceeding 6.5V risks parametric degradation or reliability issues.
Does MAX4285ESA+ require external compensation for unity-gain operation?
No, MAX4285ESA+ is internally compensated for unity-gain stability. The device is fully characterized and guaranteed to remain stable with closed-loop gains of +1V/V without any external compensation components. This eliminates design risk and board area associated with feedback capacitor tuning, especially critical in high-density ADC front-end layouts.
Can MAX4285ESA+ drive a 50Ω transmission line directly?
MAX4285ESA+ is not intended for direct 50Ω line driving. Its output stage is optimized for driving ADC inputs (typically 1kΩ || 5–10pF), not 50Ω coaxial loads. Attempting direct 50Ω drive causes excessive current draw (≥100mA at 1Vpp), leading to thermal stress and potential distortion. Use a series 25Ω isolation resistor or dedicated line driver IC for 50Ω interface.
What is the input offset voltage specification for MAX4285ESA+ over temperature?
The input offset voltage (VOS) for MAX4285ESA+ is ±0.2mV (max) at TA = +25°C and ±0.5mV (max) over the full –40°C to +85°C operating range. Its temperature coefficient (TCVOS) is 26µV/°C (typ), meaning offset drift remains predictable and bounded - essential for precision DC-coupled measurement paths in instrumentation-grade designs.
Is the DISABLE pin on MAX4285ESA+ compatible with 1.8V logic levels?
No, the DISABLE pin on MAX4285ESA+ is not 1.8V logic compatible. Its logic thresholds are defined relative to VCC: VIH ≥ VCC – 1V and VIL ≤ VCC – 2V. With VCC = 3V, VIH ≥ 2V and VIL ≤ 1V - so a 1.8V logic high fails to meet VIH. A level shifter or pull-up to VCC is required when interfacing with 1.8V FPGA/CPLD GPIOs.
MAX4285ESA+ 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:
- Buffer, Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 385V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 250 MHz
- Current - Input Bias:
- 13 µA
- Voltage - Input Offset:
- 100 µV
- 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:
- 8-SOIC
MAX4285ESA+ FAQ
1.How can I place an order for MAX4285ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4285ESA+ 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 MAX4285ESA+ reliable?
The price and inventory of MAX4285ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4285ESA+ is usually 5 days.
3.What payment methods are accepted for MAX4285ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4285ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4285ESA+?
MAX4285ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4285ESA+ 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 MAX4285ESA+?
For technical support, including MAX4285ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4285ESA+ requirements.
6.How does Aetrix verify that MAX4285ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX4285ESA+ 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 MAX4285ESA+ meets industry standards.
7.What is the process for return or replacement of MAX4285ESA+?
All MAX4285ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4285ESA+, 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 MAX4285ESA+ part is unused and in its original packaging.
Return procedure for MAX4285ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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