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Analog Devices Inc./Maxim Integrated MAX3785UTT
- Part No.:
- MAX3785UTT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Video Processing
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX3785UTT.pdf
- Description:
- PC BOARD EQUALIZER
- Quantity:
- Payment:
- Shipping:
Inventory:978
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Product details
Overview
MAX3785UTT from Maxim Integrated is a 6.25Gbps, 1.8V PC board equalizer with DC-coupled CML I/O, 60mW power consumption, and 30in FR-4 compensation at 6.25Gbps - deployed in high-speed backplane interconnects between line and switch cards.
For engineers reviewing the MAX3785UTT datasheet, MAX3785UTT pinout, MAX3785UTT application, or MAX3785UTT equivalent, this page delivers verified electrical specs, TDFN-EP package layout, deterministic jitter vs. board length, and real-world equalization performance for NRZ serial links up to 6.4Gbps.
Technical Context
The MAX3785UTT integrates an adaptive equalizer, limiting amplifier, offset cancellation circuit, and CML output driver in a single die. Its low-frequency cutoff of 50kHz requires input data to achieve 50% mark/space ratio within 100µs to avoid oscillation.
It operates across 1.0–6.4Gbps NRZ data rates, supports coding-independent operation (8b/10b or scrambled), and delivers deterministic jitter as low as 15ps at 6.25Gbps over 30in FR-4 - measured using PRBS27 test patterns and Tektronix FrameScan™ jitter decomposition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.71V to 1.89V - tight 1.8V ±5% tolerance ensures stable CML biasing and jitter control |
| Max Bit Rate | 6.4Gbps - supports double XAUI, STM-16/OC-48, and HSBI ≤6.4Gbps systems |
| FR-4 Compensation | 30in at 6.25Gbps - enables reliable signal recovery across mid-backplane lengths without AC coupling |
| Power Dissipation | 60mW typical - allows dense placement on line/switch cards without thermal derating |
| Differential Input Resistance | 100Ω ±15% - matches standard 100Ω differential PCB traces for minimal reflection |
| Output Swing | 450–800mVP-P into 50Ω - sufficient margin for downstream CML receivers after channel loss |
| Latency | 200ps - negligible delay for real-time switching fabric timing budgets |
Pinout & Package
The MAX3785UTT is housed in a 6-pin TDFN-EP package (1.5mm × 1.5mm footprint) with exposed pad for thermal and ground integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN− | Negative CML data input - differential pair with 100Ω input resistance; requires matched 100Ω routing |
| 2 | GND | Supply ground - connects directly to exposed pad; critical for return path integrity and jitter suppression |
| 3 | OUT− | Negative CML data output - current-mode output with 50Ω source impedance; terminates into 50Ω load |
| 4 | OUT+ | Positive CML data output - complements OUT−; forms differential pair with 42–58Ω output resistance |
| 5 | VCC | 1.8V supply - must be filtered per supply noise tolerance spec (≤10mVP-P above 1MHz) |
| 6 | IN+ | Positive CML data input - completes differential input pair; common-mode range tied to VCC |
| EP | Exposed Pad | Thermal & ground plane connection - soldered to PCB ground pour to reduce thermal resistance and EMI |
Key Features
| Feature | Design Value |
|---|---|
| DC-coupled CML I/O | Eliminates AC coupling capacitors and associated board area, BOM cost, and low-frequency distortion |
| Coding independence | Supports both 8b/10b encoded and scrambled NRZ streams without reconfiguration or performance penalty |
| Offset cancellation circuit | Minimizes pulse-width distortion by correcting internal limiter offset - critical for maintaining 50% duty cycle |
| Low-frequency cutoff at 50kHz | Enables DC balance while constraining minimum run length; mandates <100µs 50% mark/space convergence |
| Small 1.5mm × 1.5mm footprint | Fits in space-constrained switch card edge connectors and line card SerDes breakout zones |
Applications
| HSBI Backplane Interconnect | Double XAUI Interface |
|---|---|
Use Scenario: High-speed serial bus interconnect between line card MAC and switch fabric ASIC over FR-4 backplane. IC Role / Device Role / Timing Role: Board-level equalizer restoring signal integrity before CDR at receiver input. Use Value: Enables 6.25Gbps operation over 30in FR-4 without AC coupling or retiming - reducing latency and component count. | Use Scenario: Doubling IEEE 802.3ae XAUI lanes to achieve 10Gbps aggregate throughput on legacy switch cards. IC Role / Device Role / Timing Role: Signal conditioning block placed between XAUI PHY and backplane trace. Use Value: Compensates for insertion loss and deterministic jitter induced by long FR-4 runs, preserving eye opening at 3.125Gbps per lane. |
| STM-16/OC-48 Duplex Link | Switch-Fabric SerDes Extension |
Use Scenario: Dual-channel SONET OC-48 interface operating at 2.488Gbps across telecom backplanes. IC Role / Device Role / Timing Role: Channel equalizer placed on line card transmit path to pre-compensate for board loss. Use Value: Extends usable FR-4 span to 40in at ≤3.2Gbps - supporting legacy rate migration paths without redesign. | Use Scenario: Extending reach of switch ASIC SerDes outputs to remote daughter cards or mezzanine modules. IC Role / Device Role / Timing Role: Post-SerDes equalization stage driving differential CML signals onto mid-length PCB traces. Use Value: Maintains >20dB return loss up to 3.2GHz and reduces residual deterministic jitter to <30ps - ensuring clean clock/data recovery. |
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; RoHS-compliant lead-free finish | No functional difference - used where Pb-free compliance is mandated | Select MAX3785UTT+ for new designs requiring RoHS conformance; MAX3785UTT remains viable for legacy builds. |
| MAX3785UBL | Same core functionality but in 6-pin UCSP (3×3 bump array); no exposed pad | UCSP requires different PCB land pattern and reflow profile; lower thermal conductivity than TDFN-EP | Choose MAX3785UBL only when ultra-low profile (<0.5mm height) or space-constrained top-side mounting is required. |
Compared with MAX3785UTT+, the MAX3785UTT offers identical performance but lacks lead-free finish; versus MAX3785UBL, it provides superior thermal dissipation via EP and simplified assembly with standard TDFN footprint - making it preferred for high-volume backplane applications demanding reliability and manufacturability.
Availability
MAX3785UTT is available at Aetrix Electronics and suitable for HSBI backplane interconnects, double XAUI interfaces, and STM-16/OC-48 systems requiring stable component supply across extended production lifecycles.
Supply support for MAX3785UTT 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 systems.
The MAX3785 product line targets high-speed board-level signal integrity - specifically equalizing NRZ serial data over FR-4 PCBs in telecom, networking, and switch-fabric equipment.
FAQ
What is the maximum FR-4 trace length the MAX3785UTT can compensate at 6.25Gbps?
The MAX3785UTT compensates for up to 30in of FR-4 board material at 6.25Gbps, as confirmed by deterministic jitter measurements using PRBS27 patterns and Tektronix FrameScan™ analysis. This performance assumes 500mVP-P input swing and standard FR-4 dielectric properties (εr = 4.0–4.4, tanδ = 0.022). The MAX3785UTT achieves this without AC coupling, leveraging its DC-coupled CML architecture.
Does the MAX3785UTT require external configuration or control pins?
No, the MAX3785UTT is fully autonomous - it contains no digital control interface, configuration registers, or external biasing components. Its equalization response adapts inherently to signal characteristics via analog feedback loops within the equalizer and limiting amplifier blocks. The MAX3785UTT operates immediately upon application of 1.8V supply and valid CML input signals.
What is the supply noise tolerance specification for the MAX3785UTT?
The MAX3785UTT tolerates supply ripple of ≤100mVP-P below 100Hz, ≤40mVP-P from 100Hz to 1MHz, and ≤10mVP-P from 1MHz to 1GHz - per its Operating Conditions table. This strict high-frequency noise rejection is essential to maintain low random jitter (<1.0psRMS) and prevent supply-induced modulation of the CML output stage in the MAX3785UTT.
Can the MAX3785UTT be used with 2.5Gbps or 3.125Gbps signals?
Yes, the MAX3785UTT supports data rates from 1.0Gbps to 6.4Gbps. At 2.5Gbps and 3.125Gbps, it extends FR-4 reach to 40in while maintaining deterministic jitter <20ps - demonstrated in eye diagrams and jitter vs. board length plots. Its coding independence ensures consistent performance with both 8b/10b and scrambled NRZ streams in the MAX3785UTT.
What is the role of the exposed pad (EP) on the MAX3785UTT package?
The exposed pad on the MAX3785UTT serves dual purposes: it provides a low-inductance ground connection to minimize supply noise coupling and acts as a thermal conduction path to dissipate the device's 60mW power. Per Maxim's layout guidelines, the EP must be soldered to a solid PCB ground pour - not left floating - to ensure specified jitter, return loss, and thermal performance in the MAX3785UTT.
MAX3785UTT 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 FAQ
1.How can I place an order for MAX3785UTT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3785UTT 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 reliable?
The price and inventory of MAX3785UTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3785UTT is usually 5 days.
3.What payment methods are accepted for MAX3785UTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3785UTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3785UTT?
MAX3785UTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3785UTT 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?
For technical support, including MAX3785UTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3785UTT requirements.
6.How does Aetrix verify that MAX3785UTT is sourced from the original manufacturer or authorized distributors?
All MAX3785UTT 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 meets industry standards.
7.What is the process for return or replacement of MAX3785UTT?
All MAX3785UTT units undergo pre-shipment inspection (PSI). If there is an issue with MAX3785UTT, 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 part is unused and in its original packaging.
Return procedure for MAX3785UTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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