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Home > Products > Integrated Circuits (ICs) > Linear > Special Purpose Amplifiers

Analog Devices Inc./Maxim Integrated MAX3747EUB

Name: MAX3747EUB
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX3747EUB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX3747EUB

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Special Purpose Amplifiers

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: MAX3747EUB.pdf

Description:: 155MBPS TO 3.2GBPS, LIMITING AMP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MAX3747EUB from Maxim Integrated is a multirate limiting amplifier designed as a data quantizer in optical receiver front-ends for SONET OC-3 to OC-48, Fibre Channel, and Gigabit Ethernet systems. It operates from 155Mbps to 3.2Gbps, delivers 57dB gain, provides 500mV_P-P CML differential output, and features programmable loss-of-signal (LOS) detection with chatter-free hysteresis. It targets SFP/SFF transceiver modules requiring low-power, high-fidelity signal regeneration.

For engineers reviewing the MAX3747EUB datasheet, MAX3747EUB pinout, MAX3747EUB application, or MAX3747EUB equivalent, this page delivers verified electrical specs, validated pin functions, confirmed package mapping to the 10-pin µMAX, real-world jitter and BER performance at 3.2Gbps, and two field-validated alternative parts for transceiver design continuity.

Technical Context

The MAX3747EUB implements a high-gain, multistage SiGe bipolar amplifier with integrated offset correction loop (3.2kHz low-frequency cutoff) and RMS-based LOS detection. Its input stage provides 50Ω termination referenced to VREF, supporting PECL-compatible AC-coupled inputs.

The CML output buffer delivers controlled edge speeds (70–120ps transition time), 500mV_P-P amplitude into 50Ω loads, and supports static squelch via combined DISABLE/LOS logic. The device uses a two-resistor divider on TH pin to set programmable LOS thresholds with 1.25dB hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate Range	155Mbps to 3.2Gbps - supports full OC-3 through OC-48, 1G/2G Fibre Channel, and Gigabit Ethernet line rates
Small-Signal Gain	57dB - sufficient to amplify weak transimpedance amplifier outputs to full CML swing without saturation
Differential Output	500mV_P-P - standardized CML level compatible with downstream SERDES clock/data recovery circuits
Supply Current	30–35mA - enables low-power SFP module compliance with 1W thermal envelope
Deterministic Jitter	13.2–150ps_P-P - measured across data rates and input amplitudes; critical for meeting SONET OC-48 BER <10⁻¹²
Input Sensitivity	4mV_P-P - minimum detectable differential input amplitude before BER exceeds 10⁻¹²
LOS Hysteresis	1.25dB - prevents false toggling near threshold during marginal signal conditions

Pinout & Package

The MAX3747EUB is housed in a 3mm × 3mm, 10-pin µMAX® package (U10C-4), optimized for compact SFP/SFF optical receiver modules.

Pin/Terminal	Circuit Role	Design Meaning
1 - DISABLE	TTL-level enable control	Asserting high disables CML outputs (OUT+/OUT−) while preserving LOS functionality; enables squelch when tied to LOS
2 - IN+	Noninverted differential input	50Ω-terminated AC-coupled node accepting PECL-compatible signals; referenced to VREF
3 - IN−	Inverted differential input	Complementary to IN+; forms balanced pair for common-mode noise rejection
4 - VREF	Reference voltage source	Provides bias reference for input termination and LOS threshold divider network
5 - TH	LOS threshold programming	Voltage divider input (RTH1/RTH2 ≥ 5kΩ) setting assert/deassert levels; VTH referenced to VCC
6 - GND	Analog/digital ground	Common return path for supply, inputs, and internal circuitry; requires low-inductance layout
7 - LOS	Open-collector status output	Active-high open-drain signal indicating input below programmed threshold; requires external pullup
8 - OUT−	Inverted CML output	Current-mode logic output delivering 500mV_P-P differential swing into 50Ω load
9 - OUT+	Noninverted CML output	Complementary to OUT−; forms high-speed differential pair for SERDES interface
10 - VCC	Positive supply	+2.97V to +3.63V operation; decoupling with 0.1μF capacitors per pin required for jitter suppression

Key Features

Feature	Design Value
Pin compatibility with SY88993V	Enables drop-in replacement in existing Micrel-based SFP designs without PCB revision
Programmable LOS with hysteresis	Eliminates false triggering during transient signal fades; configurable across low/medium/high sensitivity bands
Chatter-free LOS assertion	Guaranteed 2.3–40μs assert/deassert times prevent metastability in host controller interrupt handling
Low-power CML output stage	30–35mA total supply current enables dual-channel SFP modules within 1W power budget
Input-referred noise of 120–150μV_RMS	Maintains >57dB SNR margin at 4mV_P-P sensitivity, ensuring robust BER <10⁻¹²

Applications

Gigabit Ethernet SFP Optical Receiver	1G/2G Fibre Channel SFP Module
Use Scenario: 1.25Gbps optical link in enterprise switch SFP cages using PIN photodiode and TIAs. IC Role / Device Role / Timing Role: Limiting amplifier converting analog TIA output to clean, jitter-controlled CML data stream for host SERDES. Use Value: 500mV_P-P CML output directly interfaces standard 1.25G SERDES with no level-shifting; 155Mbps–3.2Gbps range supports auto-negotiation fallback.	Use Scenario: 1.0625Gbps or 2.125Gbps Fibre Channel interconnect in storage area networks. IC Role / Device Role / Timing Role: Signal quantizer regenerating degraded optical eye after long-haul fiber transmission. Use Value: 57dB gain compensates for TIA gain roll-off; deterministic jitter <150ps_P-P ensures FC-PI compliance at 2.125Gbps.
OC-3 to OC-48 FEC SFP Transceiver	10G LX4 Transceiver Module
Use Scenario: Multirate SONET/SDH optical receiver supporting OC-3 (155Mbps), OC-12 (622Mbps), and OC-48 (2.488Gbps) with forward error correction. IC Role / Device Role / Timing Role: High-fidelity limiting stage preserving signal integrity prior to FEC decoder input. Use Value: Wide dynamic input range (4–1200mV_P-P) accommodates varying received power; programmable LOS supports FEC lock monitoring.	Use Scenario: Four-lane 10GBase-LX4 transceiver using coarse WDM over multimode fiber. IC Role / Device Role / Timing Role: Per-lane limiting amplifier in parallel optical receiver subassembly. Use Value: 10-pin µMAX footprint enables dense 4-channel layout; identical 3.2Gbps capability per lane supports 2.5Gbps/lane operation.

Gigabit Ethernet SFP Optical Receiver

1G/2G Fibre Channel SFP Module

Use Scenario: 1.25Gbps optical link in enterprise switch SFP cages using PIN photodiode and TIAs.

IC Role / Device Role / Timing Role: Limiting amplifier converting analog TIA output to clean, jitter-controlled CML data stream for host SERDES.

Use Value: 500mV_P-P CML output directly interfaces standard 1.25G SERDES with no level-shifting; 155Mbps–3.2Gbps range supports auto-negotiation fallback.

Use Scenario: 1.0625Gbps or 2.125Gbps Fibre Channel interconnect in storage area networks.

IC Role / Device Role / Timing Role: Signal quantizer regenerating degraded optical eye after long-haul fiber transmission.

Use Value: 57dB gain compensates for TIA gain roll-off; deterministic jitter <150ps_P-P ensures FC-PI compliance at 2.125Gbps.

OC-3 to OC-48 FEC SFP Transceiver

10G LX4 Transceiver Module

Use Scenario: Multirate SONET/SDH optical receiver supporting OC-3 (155Mbps), OC-12 (622Mbps), and OC-48 (2.488Gbps) with forward error correction.

IC Role / Device Role / Timing Role: High-fidelity limiting stage preserving signal integrity prior to FEC decoder input.

Use Value: Wide dynamic input range (4–1200mV_P-P) accommodates varying received power; programmable LOS supports FEC lock monitoring.

Use Scenario: Four-lane 10GBase-LX4 transceiver using coarse WDM over multimode fiber.

IC Role / Device Role / Timing Role: Per-lane limiting amplifier in parallel optical receiver subassembly.

Use Value: 10-pin µMAX footprint enables dense 4-channel layout; identical 3.2Gbps capability per lane supports 2.5Gbps/lane operation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar limiting amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3747AEUB	800mV_P-P CML output, 61dB gain, higher supply current (36–41mA)	Better drive strength for longer traces or higher-capacitance loads; less suitable for ultra-low-power SFPs	Select when downstream SERDES requires higher swing or system gain budget allows extra 6mA.
SY88993V	Pin-compatible Micrel part; 800mV_P-P output, 60dB gain, different LOS timing behavior	Same footprint but distinct LOS deassert characteristics under overload; not interchangeable without validation	Use only in legacy Micrel-based designs; verify LOS response with actual optical signal fade profiles.

Compared with MAX3747AEUB and SY88993V, the MAX3747EUB offers lower power (30–35mA vs. 36–41mA or unspecified), tighter 500mV_P-P output control for sensitive SERDES, and proven jitter performance at 3.2Gbps-making it optimal for power-constrained, high-BER-margin SFP receivers.

Availability

MAX3747EUB is available at Aetrix Electronics and suitable for Gigabit Ethernet SFP modules, Fibre Channel transceivers, and SONET OC-48 optical receivers requiring stable component supply across industrial temperature ranges (−40°C to +85°C).

Supply support for MAX3747EUB 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF ICs for communications, computing, and industrial systems.

The MAX3747EUB belongs to Maxim's optical receiver IC product line, engineered specifically for low-jitter, multirate limiting amplification in pluggable optical transceivers compliant with SFP MSA and SONET/SDH standards.

FAQ

What is the maximum data rate supported by the MAX3747EUB?

The MAX3747EUB supports data rates from 155Mbps up to 3.2Gbps. This range covers OC-3 (155Mbps), OC-12 (622Mbps), OC-48 (2.488Gbps), and Gigabit Ethernet (1.25Gbps), as well as 1G/2G Fibre Channel and 10GBase-LX4 lane rates. Performance specifications-including jitter, gain, and BER-are validated across this entire bandwidth in the official datasheet.

Does the MAX3747EUB require external components for basic operation?

Yes, the MAX3747EUB requires external 0.1μF decoupling capacitors on VCC and VREF pins, a two-resistor divider (RTH1/RTH2 ≥ 5kΩ) on the TH pin for LOS threshold programming, and AC-coupling capacitors (typically 0.1μF) on IN+ and IN−. These are mandatory for stable operation, jitter control, and configurable LOS behavior per the MAX3747EUB datasheet.

How does the LOS function work on the MAX3747EUB?

The MAX3747EUB's LOS function monitors input amplitude via an RMS detector and asserts an open-collector output when signal falls below a threshold set by the TH pin voltage. It includes 1.25dB hysteresis to prevent chatter and supports three sensitivity bands (low/medium/high) via VTH selection. LOS remains active even when outputs are disabled via the DISABLE pin.

Is the MAX3747EUB pin-compatible with other variants in the same family?

Yes, the MAX3747EUB is pin-compatible with MAX3747AEUB and MAX3747BEUB-same 10-pin µMAX package, identical pinout, and shared functional architecture. However, output amplitude (500mV_P-P vs. 800mV_P-P), gain (57dB vs. 61dB), and LOS overload behavior differ, so direct substitution requires validation of system-level signal swing and timing margins.

What is the typical supply current consumption of the MAX3747EUB?

The MAX3747EUB draws 30–35mA of supply current (ICC) when operating across its full temperature range (−40°C to +85°C) and data rates up to 3.2Gbps. This value includes CML output current and is specified under VCC = +2.97V to +3.63V. At room temperature and 3.3V supply, typical ICC is 30mA excluding output load current.

MAX3747EUB Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Packaging:: Bulk

Product Status:: Active

Type:: Limiting Amplifier

Applications:: Data Quantizer, Optical Receivers

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 10-uMAX

MAX3747EUB FAQ

1.How can I place an order for MAX3747EUB through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX3747EUB 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 MAX3747EUB reliable?

The price and inventory of MAX3747EUB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3747EUB is usually 5 days.

3.What payment methods are accepted for MAX3747EUB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3747EUB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX3747EUB?

MAX3747EUB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX3747EUB 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 MAX3747EUB?

For technical support, including MAX3747EUB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3747EUB requirements.

6.How does Aetrix verify that MAX3747EUB is sourced from the original manufacturer or authorized distributors?

All MAX3747EUB 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 MAX3747EUB meets industry standards.

7.What is the process for return or replacement of MAX3747EUB?

All MAX3747EUB units undergo pre-shipment inspection (PSI). If there is an issue with MAX3747EUB, 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 MAX3747EUB part is unused and in its original packaging.

Return procedure for MAX3747EUB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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