DS32EL0421

• 5-bit DDR LVDS Parallel Data Interface
• Programmable Transmit De-emphasis
• Configurable Output Levels (V_OD)
• Selectable DC-balanced Encoder
• Selectable Data Scrambler
• Remote Sense for Automatic Detection and Negotiation of Link Status
• On Chip LC VCOs
• Redundant Serial Output (ELX device only)
• Data Valid Signaling to Assist with Synchronization of Multiple Receivers
• Supports AC- and DC-coupled Signaling
• Integrated CML and LVDS Terminations
• Configurable PLL Loop Bandwidth
• Programmable Output Termination (50Ω or 75Ω).
• Built-in Test Pattern Generator
• Loss of Lock and Error Reporting
• Configurable via SMBus
• 48-pin WQFN Package with Exposed DAP

Key Specifications

• 1.25 to 3.125 Gbps Serial Data Rate
• 125 to 312.5 MHz DDR Parallel Clock
• -40° to +85°C Temperature Range
• >8 kV ESD (HBM) Protection
• Low Intrinsic Jitter — 35ps at 3.125 Gbps

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The DS32EL0421/DS32ELX0421 is a 125 MHz to 312.5 MHz (DDR) serializer for high-speed serial transmission over FR-4 printed circuit board backplanes, balanced cables, and optical fiber. This easy-to-use chipset integrates advanced signal and clock conditioning functions, with an FPGA friendly interface.

The DS32EL0421/DS32ELX0421 serializes up to 5 parallel input LVDS channels to create a maximum data payload of 3.125 Gbps. If the integrated DC-balance encoding is enabled, the maximum data payload achievable is 2.5 Gbps.

The DS32EL0421/DS32ELX0421 serializers feature remote sense capability to automatically detect and negotiate link status with its companion DS32EL0124/DS32ELX0124 deserializers without requiring an additional feedback path.

The parallel LVDS interface reduces FPGA I/O pins, board trace count and alleviates EMI issues, when compared to traditional single-ended wide bus interfaces.

The DS32EL0421/DS32ELX0421 is programmable through a SMBus interface as well as through control pins.