TRF2052

Supply voltage range (See Note 1)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 to 4.7 Vdc
Input voltage, logic signals  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 to 4.7 Vdc
Storage temperature range   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  65°C to 150°CESD protection, all pins, human body model  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 kV

The TRF2052 is a dual-channel, low-power, phase-locked loop (PLL) frequency synthesizer component designed specifically for digitally en- hanced cordless telephone (DECT) applications. The TRF2052 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 of TRF2052 is compatible with the extended performance mode (EPM) of other devices in 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 of TRF2052 drive and alters the loop-filter frequency response during a portion of the switching interval.

The speed-up mode of TRF2052 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 of TRF2052 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.