QDSP-398B

QDSP -398B is a kind of integrated circuit chip used in what are known as "Near-Field Communications" (NFC) applications. It is a two-way, low power RF chip that enables two-way communication between two NFC devices, or between a device and an NFC reader, over short range distances. The chip is implemented in a 28-pin package, and is capable of supporting NFC applications including peer-to-peer data sharing, card emulation, and reader/writer modes.

The primary application of QDSP -398B lies in its ability to support Near-Field Communications, enabling the two-way exchange of data over very short distances. It does this by making use of its integrated RF, analogue and digital processing blocks, allowing the chip to rapidly switch between frequency and protocol modes in order to communicate with different peripherals. The chip supports both active and passive modes of operation, depending on the application, and can connect to multiple peripherals simultaneously.

As far as the working principle of QDSP -398B is concerned, it is based on a radio-frequency identification (RFID) system. This system enables two NFC devices to communicate over a short-range radio frequency, which is measured in terms of centimeters rather than meters. The QDSP -398B chip processes the data transmitted between NFC devices, and also performs authentication and error correction tasks. It is also capable of providing encryption for the data that is being transferred.

In terms of other applications, QDSP-398B can be used for a variety of tasks, such as for secure mobile payments, ticketing, access control to various facilities, contactless identification, and so on. It has the ability to provide secure communications over a short-range, and it is relatively low power, thus making it ideal for a wide range of applications.

In conclusion, QDSP -398B is an integrated circuit chip designed for Near-Field Communications applications. It supports two-way communications between two NFC devices, or between a device and an NFC reader, over short range distances. It works by implementing a radio-frequency identification (RFID) system, and apart from providing for Near-Field Communications, it can also be used for a variety of other applications.