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Analog Devices Inc./Maxim Integrated MAX3264CUE+
- Part No.:
- MAX3264CUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Amplifiers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX3264CUE+.pdf
- Description:
- IC LIMITING AMP 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,358
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Product details
Overview
MAX3264CUE+ from Maxim Integrated is a 1.25Gbps current-mode logic (CML) limiting amplifier designed for Gigabit Ethernet and Fibre Channel optical receiver front-ends. It features 55dB gain, 14ps deterministic jitter, 300ps max edge speed, programmable loss-of-signal detection via external RTH, and operates from +3.0V to +5.5V supply. It serves as the signal-conditioning stage after transimpedance amplifiers like MAX3266/MAX3267 in GBIC receivers.
For engineers reviewing the MAX3264CUE+ datasheet, MAX3264CUE+ pinout, MAX3264CUE+ application, or MAX3264CUE+ equivalent, key selection criteria include its 16-pin TSSOP-EP package, CML output compatibility with inductive connectors, low-jitter performance at 1.25Gbps, and integrated RMS power detection with configurable LOS hysteresis.
Technical Context
The MAX3264CUE+ implements a multistage limiting architecture with an input buffer providing 100Ω differential impedance, followed by high-gain stages and an offset-correction loop using external CAZ1/CAZ2 capacitors. Its RMS power detector compares input signal amplitude against a threshold set by RTH to drive TTL-compatible LOS outputs with 4.4dB hysteresis.
It uses CML output buffers with selectable output current (16mA or 20mA via LEVEL pin), squelch control via SQUELCH pin, and supports AC-coupled termination per Figure 1a/b. The exposed paddle (EP) must be soldered to ground for thermal management and electrical stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 1.25Gbps - Supports full-rate Gigabit Ethernet and Fibre Channel 1x operation without oversampling. |
| Deterministic Jitter | 14psp-p - Measured with K28.5 pattern; enables robust timing margin in high-speed serial links. |
| Input Voltage Range | 10mV to 1200mVpp - Accommodates wide dynamic range from optical preamplifiers under varying received power. |
| LOS Hysteresis | 4.4dB - Provides stable optical signal detect behavior with 2.2dB optical hysteresis in receiver applications. |
| Supply Voltage | +3.0V to +5.5V - Compatible with common 3.3V and 5V system rails; supports mixed-voltage board designs. |
| Output Edge Speed | 300ps (max) - Ensures clean data eye opening while minimizing EMI and crosstalk in dense PCB layouts. |
| Differential Input Resistance | 100Ω - Matches standard 100Ω differential transmission lines and interfaces directly with MAX3266/MAX3267 TIA outputs. |
Pinout & Package
MAX3264CUE+ is housed in a 16-pin thermally enhanced thin shrink small-outline package (TSSOP-EP) with exposed paddle (EP) soldered to PCB ground for optimal thermal dissipation and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pins 1, 4, 10) | Supply voltage input | Three dedicated VCC pins reduce supply inductance and improve high-frequency PSRR; decoupling required at each pin. |
| GND (Pins 7, 11, 14) | Ground reference | Multiple ground pins minimize ground bounce and support stable 1.25Gbps switching; EP must be connected to GND plane. |
| IN+, IN− (Pins 2, 5) | Differential input pair | 100Ω matched input impedance; DC-coupling prohibited to preserve internal offset correction loop functionality. |
| OUT+, OUT− (Pins 9, 13) | CML differential data outputs | Current-mode outputs tolerant of inductive connectors; terminated per Figure 1a/b with 50Ω or 75Ω loads. |
| LOS, LOS (Pins 3, 6) | Complementary loss-of-signal indicators | TTL-compatible outputs with internal 16kΩ pull-ups; assert when input falls below RTH-programmed threshold. |
| TH (Pin 8) | LOS threshold programming node | Resistor to ground sets LOS assertion level (e.g., 2.5kΩ → 2.2mV low-level assert); defines optical sensitivity point. |
| SQUELCH (Pin 16) | Output muting control | TTL-high enables squelch: forces static output levels (VCC / VCC−100mV) when LOS is active. |
| LEVEL (Pin 15) | CML output current select | Open = ~16mA; grounded = ~20mA; adjusts output swing and drive strength for line matching. |
| CAZ1, CAZ2 (Pins 12, 15) | Offset correction loop filter nodes | External capacitor between them sets time constant (2MHz default); critical for <100µV input offset and low jitter. |
| N.C. (Pin 16) | No connection | Unused pin; must remain unconnected per datasheet to avoid functional interference. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable LOS threshold | RTH-based configuration enables precise optical sensitivity tuning across temperature and process variation. |
| CML output with squelch | Enables clean shutdown during signal loss-prevents false triggering in downstream clock/data recovery circuits. |
| 100Ω differential input impedance | Direct interface with industry-standard TIAs (e.g., MAX3266/MAX3267) without external matching networks. |
| Exposed paddle thermal design | EP soldered to ground plane ensures ≤27mW/°C derating and maintains junction temperature within spec at full load. |
| Low-frequency cutoff control | CAZ1/CAZ2 capacitor selection allows optimization for 8B/10B (≥0.01µF) or scrambled NRZ (≥0.1µF) data formats. |
Applications
| Gigabit Ethernet Optical Receiver | Fibre Channel 1x Receiver |
|---|---|
Use Scenario: Front-end signal conditioning in SFP/GBIC modules receiving 1.25Gbps optical data over multimode fiber. IC Role / Device Role / Timing Role: Limiting amplifier that restores signal amplitude and edge integrity after TIA stage; provides jitter-cleaned CML output for CDR ICs. Use Value: 14ps deterministic jitter and 300ps edge speed ensure >0.3UI eye opening at 1.25Gbps, meeting IEEE 802.3 and FC-PI-2 compliance margins. | Use Scenario: Signal regeneration in storage-area network (SAN) optical receivers operating at 1062.5MBd. IC Role / Device Role / Timing Role: High-gain limiting stage following MAX3267 TIA; delivers stable CML output to Fibre Channel serializer/deserializer. Use Value: Programmable LOS with 4.4dB hysteresis prevents chatter during marginal optical link conditions, improving link reliability. |
| System Interconnect Backplane | ATM Optical Receiver |
Use Scenario: Electrical-to-electrical retiming in midplane interconnects between line cards in telecom chassis. IC Role / Device Role / Timing Role: Signal repeater that compensates for channel loss and intersymbol interference in FR4 backplanes. Use Value: 55dB gain and wide 10–1200mV input range accommodate degraded signals from long traces, enabling ≥30-inch reach. | Use Scenario: SONET/ATM OC-3 (155Mbps) or OC-12 (622Mbps) optical receiver front-end with scrambled NRZ coding. IC Role / Device Role / Timing Role: Limiting amplifier optimized for low-duty-cycle distortion via CAZ capacitor configuration (≥0.1µF). Use Value: Configurable low-frequency cutoff (2kHz typical with 0.1µF) minimizes baseline wander and preserves BER in long-haul ATM links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3265CUE+ | 2.5Gbps data rate, 49dB gain, 11ps deterministic jitter, same 16-pin TSSOP-EP package | Designed for Fibre Channel 2x and Gigabit Ethernet 1000BASE-SX/LX; higher speed but lower gain | Select MAX3265CUE+ only if 2.5Gbps operation is required; not drop-in compatible due to different gain/jitter trade-off. |
| MAX3268CUB+ | 1.25Gbps PECL output, 10-pin µMAX-EP package, no LEVEL or CAZ pins, SQUELCH internally unconnected | Targeted for space-constrained SFF receivers; requires PECL termination to VCC−2V instead of CML 50/75Ω | Choose MAX3268CUB+ for ultra-small form factor where PECL interface and reduced pin count are prioritized over squelch flexibility. |
Compared with MAX3264CUE+, MAX3265CUE+ offers higher speed but reduced gain and jitter performance, while MAX3268CUB+ sacrifices package size and interface flexibility for compactness-neither is pin-compatible, requiring layout and termination changes.
Availability
MAX3264CUE+ is available at Aetrix Electronics and suitable for Gigabit Ethernet optical receivers, Fibre Channel 1x systems, and high-speed system interconnects requiring stable component supply across industrial temperature ranges (0°C to +70°C).
Supply support for MAX3264CUE+ 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 and mixed-signal ICs for communications, computing, and industrial applications.
The MAX3264 series belongs to Maxim's high-speed optical receiver amplifier product line, engineered specifically for low-jitter, high-gain signal conditioning in 1.25Gbps optical data links with integrated LOS and squelch functions.
FAQ
What is the maximum allowable deterministic jitter for MAX3264CUE+?
The MAX3264CUE+ has a maximum deterministic jitter of 14ps peak-to-peak, measured with a K28.5 pattern per ANSI X3.230 Annex A. This value is guaranteed over the full operating temperature range (0°C to +70°C) and supply voltage (+3.0V to +5.5V). The MAX3264CUE+ achieves this performance through its low-pass Bessel-filtered input path and precision offset-correction loop, making it suitable for demanding Gigabit Ethernet timing budgets.
How is the loss-of-signal (LOS) threshold programmed on MAX3264CUE+?
The LOS threshold on MAX3264CUE+ is programmed by connecting an external resistor RTH between the TH pin (Pin 8) and ground. Typical values range from 2.5kΩ (low-threshold mode, ~2.2mV assert) to 20kΩ (high-threshold mode, ~41.5mV assert). The exact relationship is shown in Figure TOC18 of the datasheet. This resistor sets the input voltage level at which the complementary LOS/LOS outputs toggle, enabling precise optical sensitivity calibration in the final system.
What is the function of the CAZ1 and CAZ2 pins on MAX3264CUE+?
The CAZ1 (Pin 12) and CAZ2 (Pin 15) pins on MAX3264CUE+ form the external nodes of the DC offset correction loop. A capacitor connected between them sets the loop's time constant-0.01µF yields ~2MHz cutoff for 8B/10B data, while 0.1µF yields ~2kHz for scrambled NRZ. This loop reduces input offset to <100µV, directly minimizing deterministic jitter. Leaving both pins open configures the default 2MHz setting, which is recommended for Gigabit Ethernet and Fibre Channel applications.
Can MAX3264CUE+ be used with PECL output receivers?
No, MAX3264CUE+ provides only CML-compatible differential outputs (OUT+/OUT−), not PECL. It is electrically and functionally distinct from the MAX3268/MAX3269 series, which offer PECL outputs with VCC−2V termination. Attempting to interface MAX3264CUE+ with a PECL receiver will result in incorrect logic levels and potential signal integrity issues. For PECL systems, use MAX3268CUB+ or MAX3269CUB+ instead.
What is the purpose of the exposed paddle (EP) on MAX3264CUE+?
The exposed paddle (EP) on MAX3264CUE+ is an integral part of the TSSOP-EP package's thermal and electrical design. It must be soldered directly to the PCB ground plane to ensure proper heat dissipation (derating: 27mW/°C above +70°C) and to provide a low-inductance ground return path for high-frequency signals. Failure to connect EP to ground degrades thermal performance, increases junction temperature, and may cause deterministic jitter degradation or functional failure under sustained 1.25Gbps operation.
MAX3264CUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Limiting Amplifier
- Applications:
- Optical Networks
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP-EP
MAX3264CUE+ FAQ
1.How can I place an order for MAX3264CUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3264CUE+ 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 MAX3264CUE+ reliable?
The price and inventory of MAX3264CUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3264CUE+ is usually 5 days.
3.What payment methods are accepted for MAX3264CUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3264CUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3264CUE+?
MAX3264CUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3264CUE+ 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 MAX3264CUE+?
For technical support, including MAX3264CUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3264CUE+ requirements.
6.How does Aetrix verify that MAX3264CUE+ is sourced from the original manufacturer or authorized distributors?
All MAX3264CUE+ 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 MAX3264CUE+ meets industry standards.
7.What is the process for return or replacement of MAX3264CUE+?
All MAX3264CUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX3264CUE+, 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 MAX3264CUE+ part is unused and in its original packaging.
Return procedure for MAX3264CUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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