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SA9025 Datasheet(PDF) 18 Page - NXP Semiconductors |
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SA9025 Datasheet(HTML) 18 Page - NXP Semiconductors |
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18 / 23 page  Philips Semiconductors Objective specification SA9025 900 MHz transmit modulator and 2.2 GHz fractional–N synthesizer 1997 Aug 01 18 SR01440 RSA = “11” RSA = “10” RSA = “01” RSA = “00” RSM = “11” RSM = “10” RSM = “01” RSM = “00” MAIN SELECT AUXILIARY SELECT REFERENCE INPUT DIVIDE BY NREF /2 /2 /2 Figure 8. Reference Variable Divider Phase Detectors (Figure 9) The auxiliary and main phase detectors each consist of a 2 D-type flip-flop phase and frequency detector. Each flip-flop is set by the negative edge of the divider terminal count output pulse. The reset inputs are activated after a delay when both flip-flops have been set. This avoids non-linearity or dead-band around zero phase error. The flip-flops drive on-chip charge pumps. A pull-up current from the charge pump indicates the VCO frequency shall be increased while a pull-down pulse indicates the VCO frequency shall be decreased. Current Settings The IC has two current setting pins, RN and IPEAK. The active charge pump currents and the fractional compensation currents are linearly dependent on the current in the current setting pins. This current, ISET, is set by an external resistor connected between the current setting pin and VSS. Auxiliary Output Charge Pumps The auxiliary charge pumps on pin PHA are driven by the auxiliary phase detector and the current value is determined by the external resistor attached to pin RN. |
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