HMC869LC5TR-R5

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RF Demodulators are essential components for almost any communication system based on RF signals and are responsible for extracting the baseband or low IF signals from the received RF signal. The HMC869LC5TR-R5 is an example of such a demodulator that provides high performance signal recovery with carrier tracking in a compact form factor and minimal power consumption. It is suitable for use in systems such as cellular base stations, digital television head-ends, satellite receivers, and wireless LANs. The block diagram of the HMC869LC5TR-R5 is shown below.

The HMC869LC5TR-R5 is designed to operate as a complete demodulator, interfacing directly with an antenna or a low noise amplifier output. It includes a low noise amplifier, wideband mixer, IF amplifier, IF filters, phase locked loop (PLL) frequency synthesizer, ADC and signal output pins. The amplitude response, group delay and side-lobe suppression of the IF filters of the HMC869LC5TR-R5 are optimized for the application.

The HMC869LC5TR-R5 operates from a single 5V supply, and consumes a maximum of 1.5W of power. It supports a variety of input frequencies, ranging from 1.8GHz to 3.1GHz, with the option of configuring the receive bandwidth to 50MHz, 200MHz, or 1GHz. The demodulated outputs can be selected as either Dual IF (2 x 75MHz) or Single IF (1 x 150MHz). The device also supports sample clock speeds up to 125MS/s and offers both I and Q data outputs.

The wideband mixer of the HMC869LC5TR-R5 is designed to provide a higher RF isolation between the input stages and the local oscillator. The local oscillator is a PLL-based frequency synthesizer, which can be configured to generate a wide range of frequency outputs. Furthermore, the local oscillator has a fast lock time of typically 4ms. The PLL also implements a frequency tracking mechanism, which enables the device to maintain a constant output amplitude across the entire tuning range.

The ADC of the HMC869LC5TR-R5 is an 8-bit sampling ADC with a sampling rate of up to 125MS/s. The device supports both dual and single IF output configurations. In dual IF mode, the two outputs can operate in either parallel or interleaved configurations. In single IF mode, the output can be connected directly to a Digital Signal Processor (DSP) to enable direct baseband signal processing.

The HMC869LC5TR-R5 is suitable for a wide range of applications including cellular base stations, digital television head-ends, satellite receivers, and wireless LANs. The high performance signal recovery, carrier tracking, wideband operation, and minimal power consumption of the device make it an attractive choice for system designers. Furthermore, the flexibility of the device, with its wide frequency range, multiple equalization modes, and interleaved outputs makes it suitable for a variety of systems.

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