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:2,500
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 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-speed data acquisition 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), ±106mA/±77mA output drive capability, and 40ns enable / 50ns disable timing for time-critical signal routing.
Technical Context
The MAX4285ESA-T is a unity-gain stable, voltage-feedback op amp designed specifically for driving high-resolution, high-sample-rate ADCs. Its input stage supports common-mode voltages extending to the negative rail (VEE = ground in single-supply mode), and its output delivers ±106mA sink/source into low-impedance loads without compromising linearity or settling behavior.
It features a dedicated active-low DISABLE pin that reduces supply current from 20mA to 1mA and raises output impedance to ~35kΩ, enabling clean analog signal multiplexing without loading adjacent channels. The device maintains 88dBc SFDR at 5MHz with 2pF input capacitance and 0.5Ω output impedance in active mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| -3dB Bandwidth | 250MHz at AV = +1V/V - enables full-power bandwidth support for ≥125MSPS ADCs |
| Slew Rate | 350V/µs - sustains large-signal fidelity up to 2V step without distortion-induced settling error |
| Settling Time | 8ns to 0.1% - meets timing budget for >100MSPS sampling with minimal aperture jitter contribution |
| Supply Range | +2.85V to +6.5V single supply - compatible with 3V and 5V system rails without level-shifting |
| Output Drive | −106mA / +77mA - directly drives dynamic-impedance ADC inputs (e.g., switched-capacitor front-ends) |
| SFDR | 88dBc at f = 5MHz - preserves ENOB in wideband receiver chains requiring >14-bit effective resolution |
| Disable Current | 1mA per amplifier - reduces power by 95% during idle cycles in time-interleaved or channel-multiplexed architectures |
Pinout & Package
MAX4285ESA-T is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint (5.0mm × 6.2mm, 1.75mm height). 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 | OUT | Amplifier output - low-impedance (0.5Ω), capable of ±106mA sink / ±77mA source into 300Ω load |
| 2 | IN− | Inverting input - differential pair node with 2pF input capacitance and ±0.2mV offset matching |
| 3 | IN+ | Noninverting input - rail-to-rail common-mode range (VEE to VCC − 1.25V) supports DC-coupled sensor interfaces |
| 4 | DISABLE | Active-low enable control - asserts high-impedance output state within 50ns; logic threshold VIL = VCC − 2V, VIH = VCC − 1V |
| 5 | VEE | Negative supply / ground - reference for input common-mode and output swing; must be connected even in single-supply use |
| 6 | N.C. | No internal connection - electrically isolated; may be left floating or tied to ground for mechanical stability |
| 7 | VCC | Positive supply - accepts +2.85V to +6.5V; requires local 0.1nF + 0.1µF bypassing per layout guidelines |
| 8 | NC | No internal connection - same as Pin 6; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable | Internally compensated for AV ≥ +1V/V - eliminates external compensation components in buffer configurations |
| Rail-to-rail input CMVR | Extends to VEE (ground) - enables direct interfacing with single-ended sensors or DAC outputs referenced to ground |
| High-speed disable | 40ns enable / 50ns disable - supports sub-100ns channel switching in multi-channel ADC front-ends |
| Low distortion | 88dBc SFDR @ 5MHz - maintains signal integrity in IF sampling and baseband digitization paths |
| Low noise density | 10nV/√Hz input voltage noise - minimizes added noise floor when amplifying low-level RF or sensor signals |
| High output current | ±106mA sink / ±77mA source - drives 50Ω transmission lines or ADC input capacitors without external buffers |
Applications
| High-Speed ADC Drivers | Communications Equipment |
|---|---|
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-one signal conditioning with <8ns settling to preserve aperture accuracy. Use Value: Enables full ENOB utilization by maintaining 88dBc SFDR and minimizing additive jitter via low 10nV/√Hz input noise. |
Use Scenario: Signal conditioning in the transmit path of a point-to-point microwave backhaul transceiver. IC Role / Device Role / Timing Role: High-linearity driver for DAC output prior to upconversion; disabled between bursts to reduce spectral leakage. Use Value: 250MHz bandwidth and 350V/µs slew rate support wide instantaneous bandwidth; 1mA disable current cuts idle power by 95%. |
| Instrumentation | Ultrasound Imaging Systems |
Use Scenario: Front-end buffering for a 100MHz digitizer used in automated test equipment for RF component characterization. IC Role / Device Role / Timing Role: Wideband unity-gain buffer isolating DUT from ADC input capacitance while preserving phase coherence. Use Value: 0.5Ω output impedance and 2pF input capacitance minimize reactive loading effects on calibrated measurement paths. |
Use Scenario: Channel-wise analog signal conditioning in a 128-element phased-array ultrasound beamformer. IC Role / Device Role / Timing Role: Per-channel ADC driver enabled only during echo reception window; high-Z state prevents crosstalk during transmit. Use Value: 35kΩ disabled output impedance and 85dB crosstalk rejection at 10MHz suppress inter-channel interference in dense arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC buffer amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8001ARZ | 290MHz bandwidth, 1600V/µs slew rate, no disable function, 5V-only supply (4.5–5.5V) | Lacks high-speed disable; unsuitable for multiplexed or burst-mode systems requiring output isolation | Select when maximum slew rate and bandwidth are prioritized over power gating and supply flexibility |
| THS3201DGN | 1.8GHz bandwidth, 6000V/µs slew rate, no disable, ±5V dual supply only, higher quiescent current (22mA) | Requires dual supplies; excessive bandwidth/slew for most ADC drivers; no low-power state | Choose only for ultra-wideband (>500MHz) applications where MAX4285ESA-T's 250MHz is insufficient |
Compared with AD8001ARZ and THS3201DGN, the MAX4285ESA-T uniquely balances 250MHz bandwidth, rail-to-rail input, single-supply operation down to 2.85V, and sub-50ns disable timing-making it optimal for space-constrained, power-aware, high-channel-count ADC front-ends.
Availability
MAX4285ESA-T is available at Aetrix Electronics and suitable for high-speed data acquisition, communications infrastructure, and medical ultrasound systems requiring stable component supply across extended temperature ranges and long production lifecycles.
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 ADC buffer amplifier family, engineered specifically to meet the dynamic drive, settling, and power-gating requirements of modern high-sample-rate data converters.
FAQ
What is the operating supply voltage range for the MAX4285ESA-T?
The MAX4285ESA-T 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), supporting true single-supply sensor interface applications without level-shifting circuitry. This flexibility allows direct integration into both 3V and 5V system architectures.
Does the MAX4285ESA-T require external compensation for unity-gain operation?
No, the MAX4285ESA-T is internally compensated for unity-gain stability (AV ≥ +1V/V). This eliminates the need for external compensation networks in buffer configurations, simplifying PCB layout and reducing component count. The device maintains phase margin >45° across process, voltage, and temperature variations when configured as a voltage follower or noninverting amplifier with gain ≥1.
How does the DISABLE pin function on the MAX4285ESA-T?
The DISABLE pin on the MAX4285ESA-T is an active-low control that places the amplifier output in a high-impedance state (~35kΩ) and reduces quiescent supply current from 20mA to 1mA. Enable time is typically 40ns and disable time is 50ns. Logic thresholds are VIL = VCC − 2V and VIH = VCC − 1V, ensuring robust noise immunity in noisy digital environments surrounding the MAX4285ESA-T.
What is the maximum output current capability of the MAX4285ESA-T?
The MAX4285ESA-T provides ±106mA sink and ±77mA source output current into resistive loads. This high drive strength enables direct interfacing with low-impedance ADC inputs (e.g., 50Ω or 100Ω terminated lines) and capacitive loads up to 22pF without external buffers. The linear output voltage range is VEE + 0.4V to VCC − 0.4V, preserving gain accuracy across the full swing.
Can the MAX4285ESA-T drive a 300Ω load while maintaining specified AC performance?
Yes, the MAX4285ESA-T is fully characterized into 300Ω loads. At VCC = +3V, RL = 300Ω to VCC/2, it achieves 250MHz small-signal bandwidth, 88dBc SFDR at 5MHz, and 8ns settling to 0.1%. The output impedance remains 0.5Ω in active mode, ensuring minimal gain error and flat frequency response into standard test and instrumentation impedances.
MAX4285ESA-T 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
- 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…
