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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Application Specific Clock/Timing

Analog Devices Inc./Maxim Integrated MAX3992UTG+

Name: MAX3992UTG+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX3992UTG+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX3992UTG+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Application Specific Clock/Timing

Package:: 24-WFQFN Exposed Pad

Datasheet:: MAX3992UTG+.pdf

Description:: IC DATA RECOVERY W/EQ 24-TQFN

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Product details

Overview

The MAX3992UTG+ from Maxim Integrated is a 10Gbps clock and data recovery (CDR) IC with integrated equalizer, designed for XFP optical transmitter modules. It recovers serial data from degraded FR-4 channels up to 12 inches with one connector, delivers 4mUI_RMS output jitter, supports multirate operation from 9.95Gbps to 11.1Gbps, and features XFI-compliant CML I/O for SONET OC-192, 10G Ethernet, and Fibre Channel applications.

For engineers reviewing the MAX3992UTG+ datasheet, MAX3992UTG+ pinout, MAX3992UTG+ application, or MAX3992UTG+ equivalent, key selection criteria include its 24-pin QFN package, 356mW power dissipation at +3.3V, LOS/LOL status indicators, reference clock frequency options (R_b/16 or R_b/64), and deterministic jitter of 4.6ps_P-P - all critical for high-speed optical transceiver design and compliance validation.

Technical Context

The MAX3992UTG+ integrates a feed-forward equalizer and a PLL-based retimer in a single SiGe bipolar die. Its equalizer compensates for frequency-dependent loss in FR-4 traces and connectors, enabling reliable recovery of signals as low as 400mV_P-P differential input swing. The PLL uses an external reference clock (±100ppm accuracy) solely for frequency acquisition, decoupling jitter generation performance from reference quality.

It implements CML I/O with internal 50Ω terminations on SDI± and SDO±, supports polarity inversion via TTL POL pin, and provides dual-mode functional control (FCTL1/FCTL2) for normal operation, standby, or jitter test mode with enabled SCLKO outputs. The LOL detector asserts at >651ppm frequency deviation between VCO/N and REFCLK, while LOS responds to input amplitude drop below 15–50mV_ASSERT set by analog VTH.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate Range	9.95Gbps to 11.1Gbps - supports OC-192, 10G Ethernet, Fibre Channel, and DWDM XFP modules without rate-specific reconfiguration.
Output Jitter	4mUI_RMS - meets SONET optical jitter budget with margin when driving laser diode drivers or modulators.
Deterministic Jitter	4.6ps_P-P - ensures clean eye opening after retiming, critical for BER ≤10⁻¹² in 10G systems.
Equalization Span	Up to 12in FR-4 + 1 connector - eliminates need for discrete equalizer in compact XFP form factor.
Power Dissipation	356mW at +3.3V - enables thermal management in space-constrained optical modules with 0°C to +85°C ambient operation.
Reference Clock	R_b/16 or R_b/64 - allows flexible clock sourcing from system-level timing ICs or synthesizers with ±100ppm tolerance.
LOS Threshold Control	Analog VTH input (150–500mV range) - enables precise signal-loss detection tuning across varying photodiode responsivities.

Pinout & Package

The MAX3992UTG+ is housed in a 4mm × 4mm, 24-pin QFN package (T2444-4) with exposed thermal pad that must be soldered to PCB ground for electrical integrity and thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
VCC (Pins 1,6,11,13,18)	+3.3V Power Supply	Multiple dedicated supply pins reduce IR drop and improve high-frequency PSRR for CDR stability.
GND (Pins 2,5,14,17)	Supply Ground	Strategically placed ground pins minimize loop inductance and suppress ground bounce in 10G signaling.
SDI+, SDI− (Pins 4,3)	CML Serial Data Input	Differential CML interface with internal 50Ω termination - accepts 400–1000mV_P-P swing directly from ROSA/TOSA.
SDO+, SDO− (Pins 15,16)	CML Serial Data Output	Retimed CML output with 650mV_P-P typical swing and 100Ω differential impedance match to laser driver inputs.
REFCLK+, REFCLK− (Pins 21,22)	Digital Reference Clock Input	AC-coupled 200Ω differential input - enables shared clocking with MAX3991 in XFI chipset without external components.
LOS, LOL (Pins 20,19)	TTL Status Indicators	Open-drain TTL outputs provide real-time fault monitoring for host controller diagnostics and module safety logic.
POL (Pin 10)	Data Polarity Control	TTL-selectable inversion - resolves polarity mismatch between upstream receiver and downstream laser driver without board redesign.
VTH (Pin 24)	LOS Threshold Voltage	Analog input sets LOS assert level - allows calibration against actual photodiode output under temperature and aging drift.

Key Features

Feature	Design Value
XFI-compliant CML I/O	Integrated 50Ω input/output terminations eliminate external resistors and ensure impedance-matched 10G signal integrity.
Programmable LOS threshold	VTH pin accepts 150–500mV analog voltage - enables field-adjustable loss-of-signal detection across diverse optical link budgets.
Low-jitter PLL architecture	4mUI_RMS jitter generation with 5.6–8.0MHz jitter transfer bandwidth - preserves signal fidelity for stringent SONET/ITU-T G.709 compliance.
Functional control via TTL pins	FCTL1/FCTL2 select standby mode (<40% power) or jitter-test mode (SCLKO enabled) - simplifies production test without firmware overhead.
On-chip equalizer	Compensates deterministic jitter from FR-4 skin effect and dielectric loss - extends reach to 300mm trace length without external EQ IC.

Applications

SONET OC-192 Transceivers	10G Ethernet XFP Modules
Use Scenario: High-reliability metro and long-haul optical links operating at 9.95328Gbps with FEC and strict SONET jitter masks. IC Role / Device Role / Timing Role: CDR with equalizer restores degraded signals from ROSA, generates low-jitter clock for TOSA modulation, and provides LOL/LOS monitoring for network management. Use Value: 4mUI_RMS jitter generation and 651ppm LOL threshold ensure compliance with GR-253-CORE jitter requirements at optical output.	Use Scenario: Data center interconnects using IEEE 802.3ae 10GBASE-SR/LR standards with multimode/single-mode fiber. IC Role / Device Role / Timing Role: Retimer corrects inter-symbol interference from 15-inch FR-4 backplane traces and drives laser bias/modulation circuitry with clean recovered data. Use Value: 12-inch equalization capability and 4.6ps_P-P deterministic jitter maintain >20dB eye opening margin at 10.3125Gbps.
Fibre Channel 10G Modules	DWDM Optical Transmitters
Use Scenario: Storage area networks requiring 10.51875Gbps operation with low-latency, deterministic timing for SCSI command-response cycles. IC Role / Device Role / Timing Role: CDR extracts clock and data from incoming FC frames, conditions signal for EML or DML laser drivers, and reports LOS during link flap events. Use Value: Sub-100µs LOL assert time and 3–90µs LOS response enable rapid link recovery per FC-PI-4 specification.	Use Scenario: Dense wavelength division multiplexing transmitters operating at 11.09573Gbps over ITU G.709 OTU2 framing with forward error correction. IC Role / Device Role / Timing Role: Signal conditioner compensates chromatic dispersion-induced waveform distortion and provides jitter-clean output for external MZM drivers. Use Value: Multirate support across 9.95–11.1Gbps and ±100ppm REFCLK tolerance simplify multi-standard DWDM line card design.

SONET OC-192 Transceivers

10G Ethernet XFP Modules

Use Scenario: High-reliability metro and long-haul optical links operating at 9.95328Gbps with FEC and strict SONET jitter masks.

IC Role / Device Role / Timing Role: CDR with equalizer restores degraded signals from ROSA, generates low-jitter clock for TOSA modulation, and provides LOL/LOS monitoring for network management.

Use Value: 4mUI_RMS jitter generation and 651ppm LOL threshold ensure compliance with GR-253-CORE jitter requirements at optical output.

Use Scenario: Data center interconnects using IEEE 802.3ae 10GBASE-SR/LR standards with multimode/single-mode fiber.

IC Role / Device Role / Timing Role: Retimer corrects inter-symbol interference from 15-inch FR-4 backplane traces and drives laser bias/modulation circuitry with clean recovered data.

Use Value: 12-inch equalization capability and 4.6ps_P-P deterministic jitter maintain >20dB eye opening margin at 10.3125Gbps.

Fibre Channel 10G Modules

DWDM Optical Transmitters

Use Scenario: Storage area networks requiring 10.51875Gbps operation with low-latency, deterministic timing for SCSI command-response cycles.

IC Role / Device Role / Timing Role: CDR extracts clock and data from incoming FC frames, conditions signal for EML or DML laser drivers, and reports LOS during link flap events.

Use Value: Sub-100µs LOL assert time and 3–90µs LOS response enable rapid link recovery per FC-PI-4 specification.

Use Scenario: Dense wavelength division multiplexing transmitters operating at 11.09573Gbps over ITU G.709 OTU2 framing with forward error correction.

IC Role / Device Role / Timing Role: Signal conditioner compensates chromatic dispersion-induced waveform distortion and provides jitter-clean output for external MZM drivers.

Use Value: Multirate support across 9.95–11.1Gbps and ±100ppm REFCLK tolerance simplify multi-standard DWDM line card design.

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock and data recovery applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3991UTG+	CDR with limiting amplifier (no equalizer); same pinout, shared REFCLK interface, lower power (290mW).	Requires external equalizer for FR-4 channels >6 inches; suited for short-reach copper or pre-compensated optical paths.	Select MAX3991UTG+ only when channel loss is minimal and system-level equalization is handled elsewhere.
LMK04906RGZT	Ultra-low-jitter clock generator (not CDR); no data retiming, no LOS/LOL, no CML I/O; 3.15GHz max output.	Used for clock distribution-not signal recovery; requires separate CDR upstream; supports JESD204B but not XFI.	LMK04906RGZT is not a functional alternative; it serves clock synthesis only and cannot replace MAX3992UTG+ in XFP CDR role.

Compared with MAX3991UTG+, the MAX3992UTG+ adds integrated feed-forward equalization essential for 12-inch FR-4 reach, while LM K04906RGZT lacks CDR functionality entirely and cannot process serial data - making MAX3992UTG+ the sole validated solution for XFI-compliant optical transceiver signal conditioning.

Availability

The MAX3992UTG+ is available at Aetrix Electronics and suitable for SONET OC-192 transceivers, 10G Ethernet XFP modules, and Fibre Channel 10G optical links requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for MAX3992UTG+ 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 high-speed ICs for communications, computing, and industrial applications.

The MAX3992UTG+ belongs to Maxim's high-speed optical interconnect product line, engineered specifically for XFP/X2/XENPAK module manufacturers needing integrated CDR+equalizer solutions compliant with XFI, SONET, and IEEE 802.3ae standards.

FAQ

What is the primary function of the MAX3992UTG+ in an XFP optical module?

The MAX3992UTG+ functions as a clock and data recovery IC with integrated equalizer, restoring degraded high-speed serial data from optical receivers (ROSA) and generating low-jitter clock and retimed data for laser drivers (TOSA). It enables reliable 10G operation over FR-4 traces up to 12 inches and supports multirate protocols including SONET OC-192, 10G Ethernet, and Fibre Channel - all within the XFP module's tight thermal and space constraints.

Does the MAX3992UTG+ require an external equalizer for 10G operation?

No, the MAX3992UTG+ does not require an external equalizer for standard 10G XFP applications. Its integrated feed-forward equalizer compensates for deterministic jitter caused by FR-4 trace loss and connector insertion loss, supporting up to 12 inches of FR-4 plus one connector. This eliminates the need for discrete equalizer ICs in most XFP designs, reducing BOM count and PCB area while maintaining signal integrity at 9.95–11.1Gbps.

How does the MAX3992UTG+ handle reference clock requirements for different data rates?

The MAX3992UTG+ accepts a reference clock at either R_b/16 or R_b/64, where R_b is the serial data rate. For example, at 10.3125Gbps (10G Ethernet), it supports 644.53MHz or 161.13MHz REFCLK. The device tolerates ±100ppm frequency deviation and uses the reference only for initial frequency acquisition - not for jitter filtering - allowing use of cost-effective, moderate-jitter clock sources while still achieving 4mUI_RMS output jitter.

What is the role of the VTH pin on the MAX3992UTG+?

On the MAX3992UTG+, the VTH pin is an analog input that sets the threshold voltage for the loss-of-signal (LOS) detector. Applying 150–500mV to VTH configures the LOS assert point, enabling precise calibration against actual photodiode output levels. Connecting VTH to VCC disables LOS entirely. This programmability allows system designers to adapt LOS sensitivity to varying optical power budgets, temperature drift, and aging effects without hardware changes.

Can the MAX3992UTG+ operate in low-power mode, and how is it controlled?

Yes, the MAX3992UTG+ supports a standby power-down mode that reduces supply current to less than 40% of normal operation. This mode is activated by setting FCTL1 = HIGH and FCTL2 = LOW (per Table 3 in the datasheet). In standby, the CDR and equalizer are disabled, but configuration registers retain state. Recovery time is 200µs, and the mode is intended for dynamic power management during link idle periods in energy-sensitive optical modules.

MAX3992UTG+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 24-WFQFN Exposed Pad

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

PLL:: Yes

Main Purpose:: SONET/SDH. XFP Optical Receivers

Input:: CML

Output:: CML

Number of Circuits:: 1

Ratio - Input:Output:: 1:2

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 693.5MHz

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: 0°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 24-TQFN (4x4)

MAX3992UTG+ FAQ

1.How can I place an order for MAX3992UTG+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX3992UTG+ 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 MAX3992UTG+ reliable?

The price and inventory of MAX3992UTG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3992UTG+ is usually 5 days.

3.What payment methods are accepted for MAX3992UTG+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3992UTG+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX3992UTG+?

MAX3992UTG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX3992UTG+ 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 MAX3992UTG+?

For technical support, including MAX3992UTG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3992UTG+ requirements.

6.How does Aetrix verify that MAX3992UTG+ is sourced from the original manufacturer or authorized distributors?

All MAX3992UTG+ 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 MAX3992UTG+ meets industry standards.

7.What is the process for return or replacement of MAX3992UTG+?

All MAX3992UTG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX3992UTG+, 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 MAX3992UTG+ part is unused and in its original packaging.

Return procedure for MAX3992UTG+:

1.Submit a request within 90 days.

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

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