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TSA5060ATS Arkusz danych(PDF) 10 Page - NXP Semiconductors |
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TSA5060ATS Arkusz danych(HTML) 10 Page - NXP Semiconductors |
10 / 24 page 2000 Oct 24 10 Philips Semiconductors Product specification 1.3 GHz I2C-bus controlled low phase noise frequency synthesizer TSA5060A XT/COMP frequency output It is possible to output either the crystal or the comparison frequency at pin XT/COMP to be used in the application. For example, to drive a second PLL synthesizer saving a quartz crystal. To output fxtal it is necessary to set bit XCE to logic 1 and bit XCS to logic 0, or bit XCE to logic 0 and bit XCS to logic 1 during a test mode, while to output fcomp it is necessary to set both bits XCE and XCS to logic 1. If the output signal at this pin is not used it is recommended to disable it by setting both bits XCE and XCS to logic 0. Table 10 shows how this pin is programmed. At power-on, the XT/COMP output is set with the fxtal signal selected. Prescaler enable The TSA5060A is able to work with the relationship fcomp = step size for an input frequency up to 1.3 GHz, covering the complete terrestrial and cable frequency range. If needed, the prescaler can be selected by setting bit PE to logic 1 while it is not in use if bit PE is set to logic 0. If it is important to reach a low phase noise on the controlled VCO, it is recommended to set bit PE to logic 0 and not to use the prescaler allowing the comparison frequency to be equal to the step size. Test modes It is possible to access the test modes by setting bit XCE to logic 0 and bit XCS to logic 1. One specific test mode is then selected using bits T2, T1 and T0, as described in Table 10. Table 10 XT/COMP and test mode selection; note 1 Notes 1. X = don’t care. 2. Status at Power-on reset. XCE XCS T2 T1 T0 XT/COMP OUTPUT TEST MODE 0 0 X X X disabled normal operation 1 0 XXX fxtal normal operation 1 1 XXX fcomp normal operation 01000 fxtal test operation: charge pump sink; status byte bit FL = 1 01001 fxtal test operation: charge pump source; status byte bit FL = 0 01010 fxtal test operation: charge pump disabled; status byte bit FL = 0 01011 fxtal test operation: 1 ⁄2fDIV switched to Port P0 011 X X fxtal test operation: drive voltage (pin DRIVE) is off (high-impedance); note 2 |
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