SN65LVDS105DG4

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Signal integrity engineers know that for long signal chains to function, output buffer devices are needed to drive signal traces and cables effectively. The SN65LVDS105DG4 is an output buffer commonly employed in high speed serial data applications, to drive multiple data lines over longer distances. This device is part of the SN65LVDS105 series. It can be used as either a serializer or deserializer, enabling data transmission at rates up to 100 Mbps. This comes in a compact, pin-compatible and space-saving package.

Key Features

• Operating voltage range of 3.3V
• 100 Mbps maximum data rate
• Drives up to 4 channels
• Fairly low power consumption
• Supports Point-to-Point and Daisy Chain topologies

Applications

The SN65LVDS105DG4 is a suitable output buffer for applications such as data bus interfaces, digital video broadcasting systems, external gateways, long cable connects, and serial backplane systems, to connect smaller integrated circuits (ICs) over longer distances.

Working Principle

The SN65LVDS105DG4 uses the Low Voltage Differential Signaling (LVDS) protocol to send and receive data. LVDS is implemented by utilizing two low-voltage, differential signal wires to transfer the data, while providing a lower power-consumption than the traditional RS-485 protocol. In the single-ended mode, the same two signal wires are used, while the third wire serves as the reference voltage. This reference voltage makes the transition to the LVDS equivalent of the traditional logic levels.

The output buffers of the SN65LVDS105DG4 generate a differential voltage swing between 0 and 2V when sending data in LVDS mode. This differential swing is created by the differential signal source and received by the differential receivers. The LVDS signal travels along the bus lines, with the SN65LVDS105DG4 providing impedance matching for the signal. In addition, the devices provide support for up to 4 daisy-chained line cards, allowing for easy system expansion.

In order to reduce power consumption, special features have been incorporated into the SN65LVDS105DG4. This includes a power down mode which reduces output current to 30% of its nominal value. The device is also compatible with the majority of backplane systems, while the built-in channel to channel skew adjustment and jitter filter guarantee stringent timing requirements.

Conclusion

In summary, the SN65LVDS105DG4 is a high-performance output buffer, with a low power consumption and support for up to four channels. It is suitable for applications such as serial buses and DAISy-chained line cards, while the LVDS protocol makes it ideal for long cable connections and digital video broadcasting systems. The power down mode of the SN65LVDS105DG4 provides reduced current consumption, guaranteeing reliability and reduced disruptions in the applications.

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