My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX4285ESA+T
- Part No.:
- MAX4285ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4285ESA+T.pdf
- Description:
- IC BUFFER 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,398
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX4285ESA+T from Maxim Integrated is a single-channel, high-speed voltage-feedback operational amplifier optimized as an ADC buffer driver. 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 ADC front-ends in communications and instrumentation systems.
For engineers reviewing the MAX4285ESA+T datasheet, MAX4285ESA+T pinout, MAX4285ESA+T application, or MAX4285ESA+T equivalent, key selection criteria include unity-gain stability, rail-to-rail input common-mode range (down to VEE), high-output drive (±77mA/–106mA), low distortion (88dBc SFDR at 5MHz), and fast enable/disable timing (40ns/50ns).
Technical Context
The MAX4285ESA+T 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), enabling true single-supply operation with ground-referenced inputs. The internal compensation ensures stability without external components across gain ≥1 configurations.
It features an active-low disable input that disconnects the output stage, reducing supply current from 20mA to 1mA and raising output impedance to ~35kΩ. This enables clean signal routing in multiplexer-based data acquisition systems without loading downstream channels.
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 within nanoseconds for high-dynamic-range sampling |
| Settling Time | 6ns to 0.1% - meets timing budgets for sub-10ns aperture jitter ADCs |
| SFDR | 88dBc at fC = 5MHz - preserves ENOB in demanding RF/IF digitization paths |
| Output Drive | +77mA source / –106mA sink - directly drives low-Z ADC inputs (e.g., 50Ω terminated) without external buffers |
| Disable Current | 1mA typical - reduces system power by >95% during channel idle periods in multichannel DAQ |
| Input Voltage Range | Extends to VEE (0V in single-supply) - accepts ground-referenced sensor or DAC outputs without level-shifting |
Pinout & Package
MAX4285ESA+T is housed in an 8-pin SO (Small Outline) package with standard SOIC footprint (SOIC-8, 150mil width). 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 - connects to feedback network in inverting configurations or to reference in differential setups |
| 2 | IN+ | Noninverting input - accepts single-ended or differential input signals; common-mode range includes VEE |
| 3 | OUT | Amplifier output - drives ADC input directly; high-impedance when DISABLE = low |
| 4 | VEE | Negative supply or ground - must be connected to system ground in single-supply mode |
| 5 | DISABLE | Active-low enable control - asserts high-impedance output and cuts supply current to 1mA |
| 6 | VCC | Positive supply - operates from +2.85V to +6.5V; requires local 0.1nF + 0.1µF 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 electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable | Internally compensated for AV ≥ +1V/V - eliminates need for external compensation in most ADC buffer layouts |
| Rail-to-rail input common-mode | Operates with inputs down to VEE (0V) - simplifies interfacing with ground-referenced sources like sensors or DACs |
| High-speed disable | 40ns enable / 50ns disable - enables time-sliced channel sharing without inter-channel crosstalk or settling penalties |
| Low distortion at 5MHz | 88dBc SFDR - maintains signal integrity for IF sampling in communications receivers and spectrum analyzers |
| High output current | ±77mA/–106mA drive - supports direct connection to switched-capacitor ADC inputs without series resistance degradation |
Applications
| Communications Transceiver Front-End | High-Speed Data Acquisition System |
|---|---|
|
Use Scenario: Driving the analog input of a 125MSPS pipeline ADC in a broadband wireless baseband receiver. IC Role / Device Role / Timing Role: ADC buffer amplifier providing gain-of-one signal conditioning with minimal group delay and harmonic distortion. Use Value: 250MHz bandwidth and 88dBc SFDR preserve EVM and ACLR performance; disable mode isolates unused receive chains during TDD switching. |
Use Scenario: Multiplexing eight sensor channels into a single high-speed ADC via analog switches. IC Role / Device Role / Timing Role: Channel-selectable buffer with high-Z output during inactive periods to prevent crosstalk and loading. Use Value: 35kΩ disabled output impedance and 2pF output capacitance minimize feedthrough; 40ns enable ensures tight channel-to-channel timing alignment. |
| Ultrasound Beamformer Analog Path | CCD Imaging Signal Chain |
|
Use Scenario: Buffering time-delayed echo signals before summation and digitization in portable ultrasound systems. IC Role / Device Role / Timing Role: Low-noise, fast-settling driver ensuring phase coherence across parallel receive channels. Use Value: 6ns settling time and 10nV/√Hz input noise maintain spatial resolution; single +3.3V supply simplifies power architecture. |
Use Scenario: Conditioning pixel charge output from a high-frame-rate CCD sensor prior to correlated double sampling. IC Role / Device Role / Timing Role: Low-distortion, rail-to-rail input amplifier capturing full dynamic range of photodiode signals. Use Value: Input common-mode range to VEE allows direct connection to CCD's ground-referenced output; 350V/µs slew rate handles fast pixel reset transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC buffer amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4285EUT-T | Same die, 6-pin SOT23-6 package - smaller footprint but higher thermal resistance (7.1mW/°C derating) | Better suited for space-constrained PCBs where thermal load is low and board area is premium | Select MAX4285EUT-T when board real estate is critical and ambient temperature remains ≤70°C |
| AD8009ARZ | 220MHz bandwidth, 5500V/µs slew rate, no disable function, ±5V dual-supply optimized | Higher slew rate benefits pulse applications; lacks disable mode and rail-to-rail input - requires level-shifting for ground-referenced signals | Choose AD8009ARZ only when extreme slew rate is required and disable functionality is unnecessary |
Compared with MAX4285EUT-T, the MAX4285ESA+T offers superior thermal dissipation in SO-8 and easier prototyping compatibility; versus AD8009ARZ, it provides integrated disable, lower supply voltage operation, and true single-supply input capability - making it more suitable for modern low-voltage, multiplexed ADC systems.
Availability
MAX4285ESA+T is available at Aetrix Electronics and suitable for high-speed data acquisition, communications transceiver design, and medical ultrasound equipment requiring stable component supply and long-term production continuity.
Supply support for MAX4285ESA+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and medical applications.
The MAX4285ESA+T belongs to Maxim's high-speed op amp family engineered specifically for ADC interface applications-emphasizing bandwidth, low distortion, fast settling, and seamless integration with modern data converters.
FAQ
What is the operating supply voltage range for MAX4285ESA+T?
The MAX4285ESA+T operates from a single +2.85V to +6.5V supply or dual ±1.425V to ±3.25V supplies. In single-supply mode, VEE is connected to ground, and the input common-mode range extends to that rail. This flexibility allows use in both low-voltage portable systems and higher-voltage industrial signal chains. The MAX4285ESA+T maintains full AC performance across this entire range.
Does MAX4285ESA+T require external compensation for unity-gain operation?
No, the MAX4285ESA+T is internally compensated for unity-gain stability (AV ≥ +1V/V). It does not require external compensation capacitors or resistors in standard noninverting or inverting configurations. This simplifies layout and improves reliability in high-frequency ADC buffer designs. The MAX4285ESA+T remains stable driving standard 300Ω loads without peaking or oscillation.
What is the output impedance of MAX4285ESA+T when disabled?
When the DISABLE pin is pulled low, the MAX4285ESA+T output enters a high-impedance state with typical impedance of 35kΩ. This, combined with only 2pF output capacitance, minimizes feedthrough in multiplexed architectures. The MAX4285ESA+T maintains this high-Z state while drawing just 1mA supply current-enabling efficient channel isolation without external switches.
Can MAX4285ESA+T drive a 50Ω transmission line directly?
Yes-the MAX4285ESA+T delivers –106mA sink and +77mA source current, enabling direct drive of 50Ω-terminated lines at moderate amplitudes. For full-scale 2Vpp signals, a small series resistor (~10Ω) is recommended to damp potential ringing due to reactive load interaction. The MAX4285ESA+T's 350V/µs slew rate and 250MHz bandwidth ensure fidelity through such interfaces without added latency.
Is MAX4285ESA+T pin-compatible with other devices in the MAX428x family?
No-MAX4285ESA+T (8-pin SO) shares pinout with MAX4286ESA but differs from dual-amplifier variants (e.g., MAX4287/MAX4288) which use 8-pin µMAX/SO or 10-pin µMAX packages. The DISABLE pin on MAX4285ESA+T is functionally identical to that of MAX4286ESA, but MAX4285ESA+T has no second amplifier section. Always verify pin mapping against the specific variant's datasheet before PCB reuse.
MAX4285ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 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+T FAQ
1.How can I place an order for MAX4285ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4285ESA+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 MAX4285ESA+T reliable?
The price and inventory of MAX4285ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4285ESA+T is usually 5 days.
3.What payment methods are accepted for MAX4285ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4285ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4285ESA+T?
MAX4285ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4285ESA+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 MAX4285ESA+T?
For technical support, including MAX4285ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4285ESA+T requirements.
6.How does Aetrix verify that MAX4285ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX4285ESA+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 MAX4285ESA+T meets industry standards.
7.What is the process for return or replacement of MAX4285ESA+T?
All MAX4285ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4285ESA+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 MAX4285ESA+T part is unused and in its original packaging.
Return procedure for MAX4285ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX4285ESA+T 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…
