TDA8579T/N1SU

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TDA8579T/N1SU Application Field and Working Principle

The TDA8579T/N1SU is a high-performance integrated signal level conversion device from NXP, designed for a variety of applications, mainly for high-speed signal bi-directional level conversion. The product provides a full range of signal direction control and can be configured as a single bidirectional signal converter or dual unidirectional signal converters depending on the user’s requirements. Due to its open loop topology, TDA8579T/N1SU is ideal for medium and high-speed signaling applications and can provide maximum signal conversion capabilities from 0.7V to 3.2V.

Application Fields

TDA8579T/N1SU can provide the signal conversion ability between 0.5V ~ 3.3V, and support LVDS or LVPECL. It is suitable for a variety of applications. The main application field is shown as follows:

• Data line level conversion, can replace the application of discrete components, reduce the design difficulty;
• Signal synchronization conversion, when the input and output of the system (such as LVDS and PECL) have different voltage levels, the TDA8579T/N1SU can realize level conversion and synchronization;
• As an adjustable gain amplifier, it can be used in clock/data synchronization and skew control applications;
• Circuit debugging, When debugging an interface circuit, the application of TDA8579T/N1SU can reduce the user\'s debugging time, and at the same time, it can reduce the circuit connection point.

Working Principle

TDA8579T/N1SU is an open loop level converter. The device enters a static/sleep mode when dealing with static input signals. When a static input is detected, the rising/falling edge detector inside the device activates the pull-down/pull-up circuit to convert the signal level. The conversion is realized by charging or discharging the parasitic capacitor components in the output pad area.

For a balanced signal, when the input level is greater than the threshold level of the rising/falling edge detector, the detector will output a pulse to drive the internal level converter circuit. The level converter then sources or sinks current which is used to transfer the capacitor\'s charge, thereby changing the output level. The level conversion time of TDA8579T/N1SU is 11ns, and the output settle time is up to 2.2ns.

In addition, the TDA8579T/N1SU device also has adjustable gain parameters, which can obtain various input/output level. It provides the operator with improved coding efficiency, fast turn-on speed, fully integrated pull-down or pull-up circuits and thermal shutdown mechanism.

Conclusion

TDA8579T/N1SU built-in open loop topology to complete the signal level conversion, it suitable for a variety of applications, especially when there is a need for medium and high-speed bi-directional/unidirectional signal level conversion. In addition, the device also offers adjustable gain for a variety of output signals, making it an ideal choice for modern high-speed signal interfaces.

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