4P147F35IDT

4P147F35IDT Application Field and Working Principle

The 4P147F35IDT is a monolithic programmable linear integrated circuit designed for use as an automatic gain control (AGC) circuit in FM/AM and FSK/PSK digital communications systems. It is designed to provide precise variable gain control to very low power digital signals. The IC can be programmed independently for both FSK/PSK and FM/AM modulation types. It can operate in both pulse and linear AGC modes. This IC\'s features include the ability to adjust the gain control point and the gain range, as well as the ability to select an appropriate operation mode.

Parameters

The IC operates with a supply voltage of between 3 V and 15 V, with a maximum current consumption of 20 mA. It has a linear output current of 0.7 mA and a maximum pulse output current of 50 mA. The gain can be varied over a range of 0 db to 30 db using its internal variable gain control circuit.

Working Principle

The 4P147F35IDT works by comparing the incoming signal level to its internal reference voltage. It then adjusts the output level accordingly to achieve the desired gain. If the input signal is below the reference voltage, the output level is adjusted to lower the gain and reduce the area in which the signal is amplified. Similarly, if the input signal is above the reference voltage, the output level is adjusted to increase the gain and amplify the signal. This is done by adjusting the internal current amplification factor which changes the gain.

Applications

The 4P147F35IDT is mainly used in communication systems where precise gain control is required. It is primarily used in FM/AM and FSK/PSK digital communications systems. It can also be used in systems such as TV signal amplifiers, radar systems, and audio amplifiers. It is also used in cellular handsets, automotive telematics, and wireless point-to-point communications.