Overview
The DS90LV004TVS from Texas Instruments is a 4-channel LVDS (Low-Voltage Differential Signaling) buffer/repeater designed to enhance signal integrity in high-speed data transmission applications. This device supports data rates of up to 1.5 Gbps per channel and is particularly useful for extending the reach of LVDS signals over lossy backplanes and cables. The DS90LV004TVS features configurable pre-emphasis to mitigate ISI (Inter-Symbol Interference) jitter, ensuring reliable data transmission. It operates on a single 3.3V supply and is available in a compact TQFP package, making it suitable for various industrial and commercial applications.
Key Specifications
| Parameter | Min | Max | Units |
|---|---|---|---|
| Supply Voltage (VDD) | -0.3 | 4.0 | V |
| LVDS Input Voltage | -0.3 | VDD + 0.3 | V |
| LVDS Output Voltage | -0.3 | VDD + 0.3 | V |
| Data Rate per Channel | 1.5 | Gbps | |
| Operating Temperature | -40 | 85 | °C |
| Input Capacitance (IN+ or IN- to VSS) | 3.5 | pF | |
| Input Current (VIN = 3.45V, VDD = VDDMAX) | -10 | 10 | µA |
| LVDS Output Short Circuit Current | -90 | mA | |
| Junction Temperature | 150 | °C | |
| Storage Temperature | -65 | 150 | °C |
Key Features
- Configurable Pre-Emphasis: Reduces ISI jitter from lossy transmission media with selectable pre-emphasis levels (off, low, medium, high).
- Integrated Terminations: 100Ω termination resistors on both inputs and outputs to improve signal integrity and reduce external component count.
- LVDS/CML/LVPECL Compatibility: Compatible with LVDS, CML, and LVPECL input and output signals.
- Low Output Skew and Jitter: Optimized for low skew and jitter to ensure high-quality signal transmission.
- Powerdown Mode: Activated via the PWDN input, which powers down all input and output buffers and internal bias circuitry.
- ESD Protection: 12 kV ESD protection on LVDS outputs.
- Compact Package: Available in a small TQFP package footprint.
Applications
The DS90LV004TVS is suitable for various high-speed data transmission applications, including:
- Backplane and Cable Applications: Optimized for point-to-point backplane and cable applications to extend signal reach and maintain signal integrity.
- FPGA and ASIC Interfaces: Used in interfacing with FPGA or ASIC LVDS I/O to enhance signal quality and reliability.
- Industrial and Commercial Systems: Operates over an industrial temperature range (-40°C to +85°C), making it suitable for a wide range of industrial and commercial environments.
Q & A
- What is the maximum data rate supported by the DS90LV004TVS per channel?
The DS90LV004TVS supports up to 1.5 Gbps per channel. - What is the purpose of the configurable pre-emphasis in the DS90LV004TVS?
The configurable pre-emphasis reduces ISI jitter from lossy transmission media, ensuring reliable data transmission over long or lossy cables and backplanes. - What type of input and output signals does the DS90LV004TVS support?
The DS90LV004TVS supports LVDS, CML, and LVPECL input and output signals. - How does the DS90LV004TVS handle powerdown?
The DS90LV004TVS has a powerdown mode activated via the PWDN input, which powers down all input and output buffers and internal bias circuitry. - What is the operating temperature range of the DS90LV004TVS?
The operating temperature range is -40°C to +85°C. - Does the DS90LV004TVS have integrated termination resistors?
Yes, the DS90LV004TVS has integrated 100Ω termination resistors on both inputs and outputs. - What is the package type of the DS90LV004TVS?
The DS90LV004TVS is available in a TQFP package. - Does the DS90LV004TVS have ESD protection?
Yes, the DS90LV004TVS has 12 kV ESD protection on LVDS outputs. - How can the input failsafe biasing be configured for the DS90LV004TVS?
External pull-up and pull-down resistors can be used to provide an offset for input failsafe under open-circuit conditions. The resistors should be in the 5kΩ to 15kΩ range. - What is the typical power supply current for the DS90LV004TVS?
The typical power supply current varies based on the bit data rate and other operating conditions, but it is generally very low to minimize power consumption.
