• Double integer-N PLL for 2 GHz applications
• Operation to 2.2 GHz for main synthesizer
• Operation to 200 MHz for auxiliary synthesizer
• Operates from 2.7-2.3V supply
• Normal and speed-up charge-pumps
• Low power consumption (<12 mA @ 3V)
• Low stand-by power consumption (<50uA @ 3V)
• 20-pin TSSOP package

Summary:  The TRF2052 is a dual-channel, low-power, phase-locked loop (PLL) frequency synthesizer component designed specifically for digitally enhanced cordless telephone (DECT) applications. The device is suitable for a variety of applications up through 2 GHz. A speed-up integral charge pump is used for fast channel switching. The simple serial interface is compatible with the extended performance mode (EPM) of other devices Texas Instruments’ synthesizer family.

Along with the external loop filters, the TRF2052 provides all functions for voltage-controlled oscillators (VCO) in a dual-PLL frequency synthesizer system. A main channel is provided for RF frequencies and an auxiliary channel for IF frequencies. The current-output charge pumps directly drive passive RC filter networks, to generate VCO control voltages. Fast main-channel frequency switching is achieved with a charge pump arrangement that increases the current drive and alters the loop-filter frequency response during a portion of the switching interval.

The speed-up mode is controlled by the serial interface strobe signal, which goes high when a new frequency is loaded. At this time, the internal speed-up timer is activated and it enables the speed-up mode into the speed-up timer for the preprogrammed duration. During speed-up mode, the charge pump current to the external loop filter can be changed in two ways. First, the main charge pump current can be increased. Second, an additional integral charge pump can be separately and directly connected to the external loop-filter capacitor to further decrease the loop-filter charge and discharge times.