LT5506EUF#PBF

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RF demodulators are devices that receive information from a frequency modulated or amplitude modulated signal. The LT5506EUF#PBF is part of a family of demodulator ICs designed to receive FM and AM signals on a frequency up to ~2.4 GHz. This IC is suitable for use in automotive, communications infrastructure, instrumentation, and consumer electronics applications.

Features

The LT5506EUF#PBF features a single-ended, direct-conversion architecture and an integrated I/Q delay equalizer that mitigates the detrimental effects of multipath through post-IF processing. It also features low power consumption of 5.5mW in 1.8V, low offset, and low-drift operation, as well as shock-resistant circuitry in order to withstand shocks and vibration of the automotive environment. Additionally, it has a high output level of 0.1 dBV RMS maximum and a noise dynamic range of > -80dBc min.

Block Diagram

The LT5506EUF#PBF\'s block diagram is shown in Figure 1. This IC consists of an RF input stage, an IF amplifier, a shift delay equalizer, a demodulator, an analogue decimator, a frequency synthesizer, and a digital decimator. It also includes a digital filter, an AGC, a IF-DRO, an IF-VCO, a phase-locked loop regenerator, and an RFI reject module.

Application fields

The LT5506EUF#PBF is suitable for a wide variety of applications thanks to its features and architecture. It is commonly used in FM and AM radio systems, cellular base stations, satellite receivers, digital broadcasting equipment, instrumentation, automotive audio systems, and consumer electronic products. Additionally, it is suitable for low noise, high dynamic range receivers for cellular, telecommunications, automotive, and instrumentation applications.

Working principle

The LT5506EUF#PBF uses a direct-conversion architecture with an integrated I/Q delay equalizer. In order to receive the signal, the RF signal is first amplified by the RF input stage and then downconverted to the desired intermediate frequency (IF) by the frequency synthesizer and IF amplifier. The IF signal is then passed through the shift delay equalizer that reduces multipath-induced distortion. The signal is then demodulated using a multiplier and a lowpass filter, and the audio is decimated with an analogue decimator. Finally, the digital decimator removes the unwanted in-band frequencies and allows for less complex digital audio processing.

Conclusion

The LT5506EUF#PBF is a highly integrated RF demodulator IC designed for both FM and AM signals up to ~2.4 GHz. It features low power consumption, low offset, and low drift operation, as well as a high output level of 0.1 dBV RMS maximum and a noise dynamic range of > -80 dBc min. The LT5506EUF#PBF is suitable for a wide variety of applications, such as FM and AM radio, cellular base stations, satellite receivers, digital broadcasting equipment, instrumentation, automotive audio systems, and consumer electronic products.

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