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Analog Devices Inc./Maxim Integrated MAX3785UTT-T
- Part No.:
- MAX3785UTT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Video Processing
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX3785UTT-T.pdf
- Description:
- PC BOARD EQUALIZER
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX3785UTT-T from Maxim Integrated is a 6.25Gbps, 1.8V PC board equalizer IC designed to compensate for FR-4 transmission-line loss in high-speed backplane interconnects. It integrates an equalizer, limiting amplifier, and CML output driver; operates from 1.0Gbps to 6.4Gbps; supports DC-coupled CML I/O; and delivers ≤0.30UI residual deterministic jitter at 6.25Gbps over 30in FR-4 - enabling legacy 2.5–3.125Gbps system upgrades.
For engineers reviewing the MAX3785UTT-T datasheet, MAX3785UTT-T pinout, MAX3785UTT-T application, or MAX3785UTT-T equivalent, key selection criteria include its 6-pin TDFN-EP package, 60mW power consumption, 30in FR-4 compensation capability at 6.25Gbps, coding independence (8b/10b/scrambled), and low-frequency cutoff of 50kHz - all critical for HSBI, XAUI, and STM-16/OC-48 signal integrity design.
Technical Context
The MAX3785UTT-T implements a continuous-time linear equalizer followed by a limiting amplifier with offset cancellation, enabling deterministic jitter reduction without clock recovery. Its CML input/output architecture ensures compatibility with standard SerDes interfaces while maintaining DC coupling across the signal path.
It features a 100Ω differential input resistance, 50Ω differential output resistance, and operates within a 1.71V–1.89V supply range. Latency is fixed at 200ps, and supply noise tolerance is specified as 100mVP-P below 100Hz, 40mVP-P from 100Hz–1MHz, and 10mVP-P up to 1GHz - supporting robust operation in noisy board environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Bit Rate | 6.25Gbps (guaranteed); supports up to 6.4Gbps for margin |
| Min Bit Rate | 1.0Gbps (enables backward compatibility with lower-rate systems) |
| Supply Voltage | 1.8V ±0.09V (tight regulation required; 60mW total power at 1.8V) |
| FR-4 Compensation | 30in at 6.25Gbps; extends usable trace length without redesign |
| Residual DJ | ≤0.30UI at 6.25Gbps (measured with PRBS27 pattern after 30in FR-4) |
| Input Swing Range | 400–1600mVP-P differential (supports wide amplitude variation from source) |
| Low-Freq Cutoff | 50kHz (requires 50% mark/space ratio achieved within 100µs) |
Pinout & Package
The MAX3785UTT-T is housed in a 6-pin TDFN-EP (3mm × 3mm) package with exposed thermal pad (EP). The compact footprint enables placement near connectors or ASICs to minimize stub effects.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN− | Negative CML data input; differential pair with IN+; 100Ω input impedance |
| 2 | GND | Supply ground reference; must be low-inductance connection to EP |
| 3 | OUT− | Negative CML data output; matched to OUT+; 50Ω source impedance |
| 4 | OUT+ | Positive CML data output; differential pair with OUT−; drives 50Ω loads |
| 5 | VCC | 1.8V supply input; requires local 100nF + 1µF decoupling adjacent to pin |
| 6 | IN+ | Positive CML data input; differential pair with IN−; accepts 400–1600mVP-P |
| EP | Exposed Pad | Thermal and electrical ground; must be soldered to solid GND plane for thermal dissipation and signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Coding Independence | Functions identically with 8b/10b encoded or scrambled NRZ data - no protocol-specific tuning needed |
| DC-Coupled CML I/O | Eliminates AC-coupling capacitors and associated layout constraints on high-density boards |
| 30in FR-4 Compensation @ 6.25Gbps | Enables longer trace routing without signal degradation - avoids costly layer count increases |
| 60mW Power Consumption | Reduces thermal load in dense switch/line card layouts; simplifies thermal management |
| 200ps Fixed Latency | Predictable timing budgeting for synchronous SerDes link design and jitter budget allocation |
Applications
| HSBI Interconnects | XAUI Backplane Links |
|---|---|
Use Scenario: High-Speed Backplane Interconnect (HSBI) between line and switch cards operating at ≤6.4Gbps over FR-4. IC Role / Device Role / Timing Role: Board-level equalizer placed between SerDes receiver and transmitter to restore signal integrity degraded by PCB loss. Use Value: Enables reliable 6.25Gbps operation over 30in FR-4 traces - extending reach without changing board stackup or material. | Use Scenario: Dual IEEE 802.3ae XAUI lanes running at 3.125Gbps per lane across midplane connections. IC Role / Device Role / Timing Role: Per-lane equalization to meet XAUI eye mask requirements after board trace loss. Use Value: Restores eye opening after 40in FR-4 at ≤3.2Gbps - ensuring compliance with XAUI jitter and amplitude specifications. |
| STM-16/OC-48 Systems | Legacy Rate Migration Paths |
Use Scenario: Double STM-16/OC-48 optical transport equipment using electrical backplanes for card-to-card communication. IC Role / Device Role / Timing Role: Signal conditioning element in the electrical domain before optical modulation or after photodiode reception. Use Value: Maintains BER <1e−12 over 30in FR-4 at 2.488Gbps - preserving SONET/SDH timing accuracy and jitter transfer compliance. | Use Scenario: Upgrading existing 2.5Gbps/3.125Gbps systems to support higher data rates while retaining legacy hardware. IC Role / Device Role / Timing Role: Drop-in equalizer that coexists with legacy SerDes without requiring firmware or protocol changes. Use Value: Provides seamless migration path: same pinout, voltage, and interface as prior-generation designs - no PCB rework needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed board equalizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3785UTT+ | Identical electrical specs and pinout; lead-free/RoHS-compliant version with enhanced moisture sensitivity level (MSL1) | No functional difference; preferred for new RoHS-compliant designs | Select MAX3785UTT+ when lead-free assembly and extended shelf-life handling are required |
| MAX3785ITT | Same functionality and pinout; rated for -20°C to +85°C industrial temperature range vs. 0°C to +85°C | Suitable for wider ambient environments including uncontrolled chassis or outdoor enclosures | Choose MAX3785ITT where extended temperature operation is mandatory |
Compared with MAX3785UTT-T, the MAX3785UTT+ offers identical performance with RoHS compliance and improved manufacturability, while the MAX3785ITT extends operational reliability to -20°C - making both viable alternatives depending on environmental and regulatory requirements, not electrical redesign.
Availability
MAX3785UTT-T is available at Aetrix Electronics and suitable for high-speed backplane interconnects, XAUI-based switch fabrics, and SONET/SDH transport systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX3785UTT-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 applications.
The MAX3785UTT-T belongs to Maxim's high-speed signal conditioning product line, engineered specifically for board-level equalization in 1–6.4Gbps serial links - targeting FR-4 loss compensation in telecom, datacom, and test equipment backplanes.
FAQ
What is the operating temperature range for the MAX3785UTT-T?
The MAX3785UTT-T is specified for operation from 0°C to +85°C ambient temperature. This commercial-grade rating aligns with typical line card and switch card environments in controlled datacenter or telecom chassis. The device's thermal design - including the exposed pad (EP) - ensures stable performance across this range when mounted with proper PCB copper pour and reflow profile. For extended temperature applications, consider the MAX3785ITT variant.
Does the MAX3785UTT-T require external configuration or programming?
No, the MAX3785UTT-T is a fully autonomous analog equalizer with no digital control interface, registers, or configuration pins. It operates immediately upon power-up with fixed equalization characteristics optimized for FR-4 loss profiles. All functionality - including offset cancellation, limiting amplification, and CML drive - is implemented in hardwired analog circuitry. No firmware, I²C, or SPI setup is needed for MAX3785UTT-T deployment.
Can the MAX3785UTT-T be used with AC-coupled CML interfaces?
The MAX3785UTT-T is designed exclusively for DC-coupled CML operation and does not support AC coupling. Its internal offset cancellation circuit relies on DC feedback, and the 50kHz low-frequency cutoff requires the input signal to achieve 50% duty cycle within 100µs. Inserting series capacitors will disrupt bias conditions and cause malfunction. Use only direct-coupled CML traces with proper termination when integrating the MAX3785UTT-T.
What is the maximum FR-4 trace length supported by the MAX3785UTT-T at 3.125Gbps?
At 3.125Gbps, the MAX3785UTT-T compensates for up to 40 inches of FR-4 board material - exceeding its 30-inch rating at 6.25Gbps. This extended reach is confirmed in the datasheet's Electrical Characteristics table and validated via eye diagram measurements (Figures toc04–toc06). The improvement reflects reduced frequency-dependent loss at lower bit rates, allowing greater margin for legacy OC-48 and XAUI applications.
Is the exposed pad (EP) on the MAX3785UTT-T electrically connected or thermal-only?
The exposed pad (EP) on the MAX3785UTT-T is both electrically and thermally connected to ground. Per the Pin Description table and Package Information, EP must be soldered to a solid PCB ground plane to ensure proper thermal dissipation (critical for 60mW operation) and to provide a low-inductance return path for high-frequency CML signals. Leaving EP floating or unconnected violates the recommended layout and risks instability, increased jitter, and thermal throttling.
MAX3785UTT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Equalizer
- Applications:
- Professional Video
- Standards:
- -
- Control Interface:
- Logic
- Voltage - Supply:
- 1.71V ~ 1.89V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 6-TDFN-EP (3x3)
MAX3785UTT-T FAQ
1.How can I place an order for MAX3785UTT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3785UTT-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 MAX3785UTT-T reliable?
The price and inventory of MAX3785UTT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3785UTT-T is usually 5 days.
3.What payment methods are accepted for MAX3785UTT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3785UTT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3785UTT-T?
MAX3785UTT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3785UTT-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 MAX3785UTT-T?
For technical support, including MAX3785UTT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3785UTT-T requirements.
6.How does Aetrix verify that MAX3785UTT-T is sourced from the original manufacturer or authorized distributors?
All MAX3785UTT-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 MAX3785UTT-T meets industry standards.
7.What is the process for return or replacement of MAX3785UTT-T?
All MAX3785UTT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX3785UTT-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 MAX3785UTT-T part is unused and in its original packaging.
Return procedure for MAX3785UTT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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