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Analog Devices Inc./Maxim Integrated MAX3265CUB+T
- Part No.:
- MAX3265CUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Amplifiers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX3265CUB+T.pdf
- Description:
- IC LIMITING AMP 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,617
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Product details
Overview
MAX3265CUB+T from Maxim Integrated is a 2.5Gbps CML-output limiting amplifier designed for Fibre Channel and Gigabit Ethernet optical receiver front-ends. It features programmable loss-of-signal detection (LOS), squelch control, 11ps deterministic jitter, 100–150ps edge speed, and operates from +3.0V to +5.5V supply. It delivers stable limiting gain in high-speed data recovery applications where signal integrity and low jitter are critical.
For engineers reviewing the MAX3265CUB+T datasheet, MAX3265CUB+T pinout, MAX3265CUB+T application, or MAX3265CUB+T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts with documented functional and packaging differences.
Technical Context
The MAX3265CUB+T implements a multistage limiting amplifier with 49dB total gain and integrated RMS power detection. Its offset-correction loop-tuned via external CAZ1/CAZ2 capacitors-maintains input DC offset below 100µV, directly enabling low deterministic jitter performance.
It uses current-mode logic (CML) outputs with selectable output current (16mA or 20mA via LEVEL pin), tolerant of inductive connectors and impedance mismatches. The LOS threshold is set by an external resistor (RTH) on the TH pin, with hysteresis of 2.2–4.4dB, and supports TTL-compatible LOS assertion/deassertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 2.5Gbps - supports full-rate Fibre Channel 2x and Gigabit Ethernet physical layer signaling without oversampling. |
| Deterministic Jitter | 11ps (p-p) - ensures timing margin compliance in 2.5Gbps serial links with tight eye budgets. |
| Input Voltage Range | 10mV to 1200mV (differential p-p) - accommodates wide dynamic range from transimpedance amplifiers like MAX3266/MAX3267. |
| LOS Hysteresis | 2.2–4.4dB - prevents false toggling during marginal optical input power conditions. |
| Output Edge Speed | 100–155ps - balances signal rise/fall time against EMI and inter-symbol interference in PCB traces. |
| Supply Voltage | +3.0V to +5.5V - enables direct compatibility with common 3.3V and 5V system rails without LDOs. |
| Differential Input Resistance | 97–103Ω - matches standard 100Ω differential transmission lines with minimal reflection. |
Pinout & Package
MAX3265CUB+T is housed in a 10-pin µMAX-EP package (3.0mm × 3.0mm, 0.8mm height) with exposed paddle soldered to ground for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input; decoupling required within 5mm for stable high-frequency operation. |
| 2 | IN+ | Noninverted differential input; 100Ω termination to IN− forms matched input pair. |
| 3 | IN− | Inverted differential input; must be routed as controlled-impedance pair with IN+. |
| 4 | GND | Ground reference; connects to exposed paddle for thermal and noise control. |
| 5 | TH | Loss-of-signal threshold setting; RTH to ground programs LOS assert level (e.g., 2.5kΩ → 2.2mV). |
| 6 | LOS | Inverted TTL-level LOS output; asserts low when input falls below programmed threshold. |
| 7 | OUT+ | Noninverted CML data output; requires 50Ω or 75Ω AC-coupled termination per Figure 1a/b. |
| 8 | OUT− | Inverted CML data output; must be terminated symmetrically with OUT+. |
| 9 | GND | Secondary ground pin; ties to same ground plane as Pin 4 and exposed paddle. |
| 10 | VCC | Second supply pin; improves power delivery integrity at 2.5Gbps switching frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable LOS Threshold | RTH resistor sets precise input voltage threshold (2.2–67mV range), enabling adaptive sensitivity to optical link budget variations. |
| CML Output Tolerance | Immunity to inductive connectors and PCB trace discontinuities reduces need for complex layout tuning. |
| Offset-Correction Loop | External CAZ1/CAZ2 capacitor network suppresses <100µV input offset, preserving deterministic jitter spec under temperature drift. |
| LEVEL-Controlled Output Current | 16mA (LEVEL open) or 20mA (LEVEL grounded) allows optimization of signal swing vs. power consumption. |
| Integrated Squelch Control | Squelch function mutes outputs to static levels during LOS, preventing downstream logic errors in burst-mode receivers. |
Applications
| GBIC Optical Receiver | Fibre Channel 2x Link |
|---|---|
Use Scenario: Used in GBIC modules to recover 2.5Gbps serial data from PIN photodiode outputs after transimpedance amplification. IC Role / Device Role / Timing Role: Limiting amplifier stage that converts variable-amplitude analog input into clean, constant-swing digital CML output for clock-data recovery. Use Value: Enables reliable LOS assertion with 2.2–4.4dB hysteresis, reducing false disconnects during optical power fluctuations typical in hot-pluggable modules. | Use Scenario: Front-end limiting stage in 2x Fibre Channel receivers operating at 2.125Gbps with 8B/10B encoded data. IC Role / Device Role / Timing Role: High-gain (49dB), low-jitter (11ps p-p) signal conditioner that restores signal integrity prior to CDR and deserialization. Use Value: 100–155ps edge speed and 10–1200mV input range accommodate wide dynamic range from preamps while meeting FC-PI-2 jitter masks. |
| Gigabit Ethernet SFP Receiver | ATM OC-48 Optical Interface |
Use Scenario: Embedded in SFP transceivers for 1.25Gbps/2.5Gbps dual-rate operation in enterprise switches and routers. IC Role / Device Role / Timing Role: Signal-limiting and LOS monitoring IC interfacing directly with MAX3266 transimpedance amplifier and downstream CDR IC. Use Value: Dual supply range (+3.0V to +5.5V) supports legacy 5V and modern 3.3V SFP host designs without level-shifting. | Use Scenario: Optical receiver front-end in SONET/SDH OC-48 (2.488Gbps) line cards requiring low-power, high-reliability limiting. IC Role / Device Role / Timing Role: Low-noise (230µVRMS input-referred), high-PSRR (20dB @ <2MHz) limiting amplifier for telecom-grade signal recovery. Use Value: CAZ1/CAZ2 configurable offset correction maintains jitter performance across -40°C to +85°C industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3265EUE+ | 16-pin TSSOP-EP package; wider temp range (–40°C to +85°C); identical electrical specs and pinout mapping for core signals (IN±, OUT±, TH, LOS). | Preferred for industrial/automotive environments requiring extended temperature operation; requires larger PCB footprint. | Select MAX3265EUE+ when ambient operating temperature exceeds +70°C or board space permits TSSOP package. |
| MAX3765CUB+ | Same 10-pin µMAX-EP package and pinout; higher supply current (64–90mA vs. 50–76mA); optimized for lower-noise, higher-precision optical sensing. | Better suited for ultra-low-jitter applications (e.g., coherent receiver front-ends) where 230µVRMS input noise is critical. | Choose MAX3765CUB+ only if system-level jitter budget demands sub-11ps deterministic jitter or lower input noise floor. |
Compared with MAX3265CUB+T, MAX3265EUE+ offers extended temperature support in a larger package, while MAX3765CUB+ trades higher power for improved noise performance-neither is pin-compatible drop-in replacements, but both share identical interface logic and functional behavior in standard 2.5Gbps limiting roles.
Availability
MAX3265CUB+T is available at Aetrix Electronics and suitable for Gigabit Ethernet optical receivers, Fibre Channel 2x links, and SFP transceiver modules requiring stable component supply, consistent lead-free packaging, and guaranteed long-term production continuity.
Supply support for MAX3265CUB+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.
The MAX3265CUB+T belongs to Maxim's high-speed optical receiver IC product line, engineered specifically for 2.5Gbps limiting amplification in compact, thermally efficient µMAX packages targeting pluggable optical modules.
FAQ
What is the maximum data rate supported by the MAX3265CUB+T?
The MAX3265CUB+T supports a maximum data rate of 2.5Gbps, validated per its electrical characteristics table and typical operating curves. This rating applies across the full operating temperature range (0°C to +70°C) and supply voltage range (+3.0V to +5.5V). The MAX3265CUB+T is not rated for 1.25Gbps-only variants like MAX3264; its architecture and jitter performance are optimized specifically for 2.5Gbps Fibre Channel and Gigabit Ethernet applications.
Does the MAX3265CUB+T require external termination resistors for its CML outputs?
Yes, the MAX3265CUB+T CML outputs (OUT+ and OUT−) require external termination. Per Figure 1a/b in the datasheet, a 50Ω or 75Ω load must be placed between each output and VCC (for AC-coupled configurations) or to ground (for DC-coupled), depending on system requirements. The internal output resistance is ~100Ω single-ended, so proper external termination is essential to prevent reflections and maintain signal integrity at 2.5Gbps.
How is loss-of-signal (LOS) detection configured on the MAX3265CUB+T?
LOS detection on the MAX3265CUB+T is configured using an external resistor (RTH) connected from the TH pin to ground. The value of RTH sets the input voltage threshold at which the LOS pin asserts-e.g., 2.5kΩ yields ~2.2mV low-level assert. The LOS output is inverted TTL-compatible and internally pulled up with an 8kΩ resistor. No additional components are needed beyond RTH to enable basic LOS functionality.
Is the SQUELCH function available on the MAX3265CUB+T?
No, the SQUELCH function is not available on the MAX3265CUB+T. As confirmed in the Pin Description section, "In the MAX3265/MAX3268/MAX3269 10-pin µMAX, SQUELCH is not connected." The MAX3265CUB+T omits the SQUELCH pin entirely-unlike the TSSOP variants (e.g., MAX3265CUE+)-and therefore cannot mute outputs based on LOS state. Designers must implement squelch externally if required.
What is the role of the CAZ1 and CAZ2 pins on the MAX3265CUB+T?
The CAZ1 and CAZ2 pins on the MAX3265CUB+T form the external node for the offset-correction loop capacitor. A capacitor connected between CAZ1 and CAZ2 sets the time constant of the DC offset correction circuit, which actively suppresses input offsets to <100µV. For 8B/10B-coded signals (e.g., Fibre Channel, Gigabit Ethernet), these pins are left open (fOC = 2MHz); for scrambled NRZ (e.g., ATM), a ≥0.1µF capacitor is recommended to lower fOC to ~2kHz.
MAX3265CUB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Limiting Amplifier
- Applications:
- Optical Networks
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-uMAX-EP
MAX3265CUB+T FAQ
1.How can I place an order for MAX3265CUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3265CUB+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 MAX3265CUB+T reliable?
The price and inventory of MAX3265CUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3265CUB+T is usually 5 days.
3.What payment methods are accepted for MAX3265CUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3265CUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3265CUB+T?
MAX3265CUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3265CUB+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 MAX3265CUB+T?
For technical support, including MAX3265CUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3265CUB+T requirements.
6.How does Aetrix verify that MAX3265CUB+T is sourced from the original manufacturer or authorized distributors?
All MAX3265CUB+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 MAX3265CUB+T meets industry standards.
7.What is the process for return or replacement of MAX3265CUB+T?
All MAX3265CUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX3265CUB+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 MAX3265CUB+T part is unused and in its original packaging.
Return procedure for MAX3265CUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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