GTL2002D,112

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Introduction to GTL2002D,112 Logic-Translators, Level Shifters

GTL2002D,112 logic-translator, level-shifter is a logic-translator used in high-speed and wireless communication. It is well-suited for interfacing Communications Controller to the High Speed Interface. It performs bidirectional level translation between the two independent logic domains. Thus, the GTL2002D,112 can interface two independent logic domains separated by any voltage difference. GTL2002D,112 has become a popular choice for applications that require level-shifting between driver/receiver circuits.

Types of Level Shifting

There are four types of level shifting technique employed by the GTL2002D,112. These include: digital logic, CMOS logic, ACVC logic, and PECL logic.

Digital logic is a type of level-shifting technique in which one voltage is directly translated to another voltage. In CMOS logic, one voltage is translated into another by means of a frequency-dependent AC current. ACVC (Along Channel Voltage Control) logic is a kind of level-shifting technique used in low-cost receivers. Here, one voltage is translated into another by means of an AC voltage. Finally, PECL (Pulse-Electric Current Level) logic is a logic level-shifter in which one voltage is translated into another by means of an AC current.

Application Field

The GTL2002D,112 is typically used for translating CMOS-level signals in high-speed communication interfaces. It can be used in applications such as digital TV and mobile phones, digital ICs, and other mixed-signal system designs requiring level shifting. It is most commonly used in PECL, ACVC, or CMOS logic level translation for differential pair, multi-bit protocol data, or address and data transfer signals.

The GTL2002D,112 is also suitable for level-shifting between two different levels of HFI single-ended and differential pair I/O interfaces, such as those found in MiBus, PCI Express and Ethernet networks. The GTL2002D,112 permits the use of a single level-shifter to interface between two different voltage, logic, and signal levels.

Working Principles

The GTL2002D,112 employs a low-voltage differential-signal, voltage-controlled-steering (VCS) chip. It is designed for bidirectional level-shifting between two different voltages of various logic circuits. The GTL2002D,112 provides a 1:1 speed ratio, resulting in the same level of transmitted signal, making it suitable for interfacing communication circuits with high-speed HFIs. It also takes into account the on-chip, frequency-dependent circuits, which effectively reduce signal distortion caused by high-speed frequency switching.

The GTL2002D,112 employs some novel level-shifting schemes to provide a versatile and low-power level-translation circuit. It employs a CMOS-logic-based input stage, with two voltage reference dividers present for selecting the reference voltage of either the high-or low-level signal sources. The level-shifting circuit also includes a PECL-based output stage and a differential amplifier which allows for the suitable signal swing up to the desired signal level.

Finally, the GTL2002D,112 includes a specialized circuit for tuning the signal gain. This allows for the accurate adjusting of the desired signal levels without any external components. Thus, the GTL2002D,112 provides the necessary voltage swing for both data and address lines.

Conclusion

The GTL2002D,112 is a highly reliable logic-translator, level-shifter that provides accurate level shifting between different logic domains. It is well-suited for interfacing high-speed HFIs with communication interfaces. Its four different types of level shifting techniques – digital logic, CMOS logic, ACVC logic and PECL logic – make it suitable for a wide range of applications. Its on-chip circuits reduce signal distortion due to high-speed frequency switching. Additionally, the specialized circuit aids in tuning the signal gain accurately, without any external components. This makes the GTL2002D,112 a great choice for applications which require level-shifting.

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