My Inquiry
My Account
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:3,921
Please send an inquiry. Send us your inquiry, and we will respond immediately.
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 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-enabling multiplexing in high-density data acquisition systems.
For engineers reviewing the MAX4285ESA datasheet, MAX4285ESA pinout, MAX4285ESA application, or MAX4285ESA equivalent, key selection criteria include unity-gain stability, rail-to-rail input common-mode range (down to VEE), ±106mA/±77mA output drive capability, and 40ns enable / 50ns disable timing for time-critical signal routing.
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 input stage extends to the negative rail (VEE), supporting ground-referenced single-supply operation, and its output drives low-impedance loads up to ±106mA sink / ±77mA source with linear swing from (VEE + 0.4V) to (VCC – 0.4V).
It features a dedicated active-low DISABLE pin that reduces supply current from 20mA to 1mA and raises output impedance to ~35kΩ, enabling clean channel isolation in multiplexed ADC front-ends. The device achieves 88dBc SFDR at 5MHz and maintains 0.1dB flatness up to 100MHz under 300Ω load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| -3dB Bandwidth | 250MHz at AV = +1V/V - supports wideband signal conditioning before 100+ MSPS ADCs |
| Slew Rate | 350V/µs - enables full-scale step response without slewing distortion in fast transient applications |
| Settling Time | 8ns to 0.1% - meets timing budgets for sub-10ns aperture jitter ADCs |
| SFDR | 88dBc at f = 5MHz - preserves dynamic range in demanding IF sampling and baseband digitization |
| Output Drive | –106mA / +77mA - directly drives low-Z ADC inputs (e.g., 50Ω differential or 100Ω terminated traces) |
| Disable Current | 1mA per amplifier - reduces system power by >95% during idle or channel-switching intervals |
| Input CM Range | VEE to VCC – 1.25V - accommodates ground-referenced sensors and single-supply signal chains |
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; the package is RoHS-compliant and rated for –40°C to +85°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN– | Inverting input - accepts differential or single-ended feedback configurations; 2pF typical input capacitance |
| 2 | IN+ | Noninverting input - rail-to-rail common-mode range supports DC-coupled sensor interfaces |
| 3 | OUT | Amplifier output - capable of ±106mA sink / ±77mA source into 20Ω loads |
| 4 | DISABLE | Active-low enable control - asserts high-impedance output (≈35kΩ) and cuts supply current to 1mA |
| 5 | VEE | Negative supply / ground - referenced for single-supply operation; must be bypassed with 0.1µF + 0.1nF |
| 6 | VCC | Positive supply - operates from +2.85V to +6.5V; requires local 0.1µF + 0.1nF bypassing |
| 7 | N.C. | No internal connection - leave unconnected or tie to ground per layout best practices |
| 8 | N.C. | No internal connection - same as Pin 7; no functional role |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable architecture | Guaranteed stable at AV = +1V/V without external compensation - simplifies PCB layout for ADC driver use |
| High-speed disable | 40ns enable / 50ns disable timing with 35kΩ disabled output impedance - enables sub-100ns channel switching |
| Rail-to-rail input common-mode | Operates with inputs down to VEE (ground) - eliminates level-shifting for single-supply sensor front-ends |
| Low distortion at 5MHz | 88dBc SFDR - preserves ENOB in 12–14-bit ADC systems sampling at intermediate frequencies |
| Robust output drive | ±106mA sink / ±77mA source - drives 50Ω transmission lines and capacitive ADC inputs without external buffers |
Applications
| Communications Baseband | Ultrasound Beamforming |
|---|---|
|
Use Scenario: Conditioning I/Q signals prior to digitization in LTE/5G radio transceivers. IC Role / Device Role / Timing Role: ADC input buffer providing gain, filtering interface, and channel enable/disable sequencing. Use Value: 250MHz bandwidth and 88dBc SFDR preserve EVM and ACLR performance across 20MHz+ signal bandwidths. |
Use Scenario: Driving multiplexed ADC inputs across 128+ transducer channels in portable ultrasound systems. IC Role / Device Role / Timing Role: High-Z isolated buffer enabling rapid analog channel selection without crosstalk. Use Value: 50ns disable time and 35kΩ output impedance minimize inter-channel interference during T/R switching. |
| High-Speed Instrumentation | CCD Imaging Systems |
|
Use Scenario: Front-end amplification for 100+ MSPS oscilloscope digitizers requiring low noise and fast settling. IC Role / Device Role / Timing Role: Wideband buffer delivering full-scale steps to ADC with <8ns settling to 0.1%. Use Value: 350V/µs slew rate and 8ns settling ensure accurate capture of nanosecond-scale transients. |
Use Scenario: Pixel clock-synchronized signal conditioning for high-frame-rate scientific CCD sensors. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain stage preceding correlated double sampling (CDS) ADCs. Use Value: 10nV/√Hz input voltage noise and 88dBc SFDR maintain SNR in low-light, high-gain imaging modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC buffer amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4286ESA | 150MHz bandwidth, gain-of-5 stable only; no unity-gain support | Requires minimum +5V/V closed-loop gain - unsuitable for direct unity-gain ADC buffering | Select when fixed high-gain signal conditioning precedes ADC, not for direct unity-gain drive |
| AD8009ARZ | 1GHz bandwidth, no disable function; 12mA quiescent current; dual-supply biased | Lacks high-Z disable mode and rail-to-rail input - requires level-shifting in single-supply systems | Choose for ultra-wideband (>500MHz) applications where disable functionality is unnecessary |
Compared with MAX4286ESA and AD8009ARZ, the MAX4285ESA uniquely combines unity-gain stability, rail-to-rail input, high-speed disable, and single-supply operation - making it the only option among the three qualified for low-power, multiplexed, ground-referenced ADC front-ends.
Availability
MAX4285ESA is available at Aetrix Electronics and suitable for high-speed ADC drivers, communications baseband signal chains, and ultrasound beamforming systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
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) designs precision analog, mixed-signal, and power management ICs for industrial, communications, and medical applications.
The MAX4285ESA belongs to Maxim's high-speed ADC buffer amplifier family, engineered specifically to meet the stringent settling, distortion, and drive requirements of 100+ MSPS analog-to-digital conversion systems.
FAQ
What is the operating supply voltage range for the MAX4285ESA?
The MAX4285ESA operates from a single +2.85V to +6.5V supply or dual ±1.425V to ±3.25V supplies. At +3V nominal, it delivers full 250MHz bandwidth and 350V/µs slew rate. The input common-mode range extends to VEE (ground in single-supply use), and output swing is specified from (VEE + 0.4V) to (VCC – 0.4V). This makes the MAX4285ESA compatible with both 3.3V and 5V system rails.
Does the MAX4285ESA support unity-gain stable operation?
Yes, the MAX4285ESA is internally compensated for unity-gain stability (AV = +1V/V). Unlike the MAX4286ESA or MAX4387/MAX4388 variants-which require minimum +5V/V gain-the MAX4285ESA can be configured as a voltage follower or noninverting buffer without external compensation components. This simplifies design for direct ADC input buffering where gain = 1 is required.
How does the DISABLE pin function on the MAX4285ESA?
The DISABLE pin on the MAX4285ESA is an active-low logic input. When pulled low (≤0.8V), it disables the amplifier: quiescent supply current drops from 20mA to 1mA, and the output enters a high-impedance state (~35kΩ). Enable time is typically 40ns and disable time is 50ns. This behavior is confirmed in the datasheet's AC Electrical Characteristics table and Typical Operating Characteristics plots (Figures MA4285-45/46).
What is the maximum output current drive capability of the MAX4285ESA?
The MAX4285ESA provides ±106mA sink and ±77mA source output current drive into 20Ω loads, as specified in the DC Electrical Characteristics table. This high drive strength allows direct interfacing with low-impedance ADC inputs (e.g., 50Ω differential or 100Ω terminated traces) without external current-boosting stages. Output voltage swing remains linear within (VEE + 0.4V) to (VCC – 0.4V) under these conditions.
Is the MAX4285ESA pin-compatible with other devices in the MAX428x family?
The MAX4285ESA shares the same 8-pin SO package and pinout as the MAX4286ESA and MAX4287ESA, but differs functionally: MAX4286ESA requires minimum +5V/V gain and MAX4287ESA is dual-channel. The MAX4285ESA's DISABLE pin (Pin 4) and N.C. pins (7,8) match the SO variant footprint exactly. However, electrical compatibility depends on gain configuration and disable usage - always verify loop stability and disable logic levels per application.
MAX4285ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 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.
MAX4285ESA Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
