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TSA5059A Datenblatt(PDF) 9 Page - NXP Semiconductors |
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TSA5059A Datenblatt(HTML) 9 Page - NXP Semiconductors |
9 / 24 page 2000 Oct 24 9 Philips Semiconductors Product specification 2.7 GHz I2C-bus controlled low phase noise frequency synthesizer TSA5059A Reference divider ratio The reference divider ratio is set by 4 bits in the WRITE mode, giving 16 different ratios which allow to adjust the comparison frequency to different values, depending on the compromise which has to be found between step size and phase noise. Table 8 shows the different dividing ratios and the corresponding comparison frequencies and step size, assuming the device is provided with a 4 MHz signal at pin XTAL. Table 8 Reference dividing ratios Note 1. Only valid when the IC is used with a 4 MHz crystal. Charge pump current The charge pump current can be chosen from 4 different values depending on the value of bits C1 and C0 in the I2C-bus byte 4 according to Table 9. Table 9 Charge pump current R3 R2 R1 R0 RATIO COMPARISON FREQUENCY(1) STEP BIT PE = 0(1) BIT PE = 1(1) 000022 MHz 2 MHz 4 MHz 000141 MHz 1 MHz 2 MHz 00108500 kHz 500 kHz 1 MHz 001116 250 kHz 250 kHz 500 kHz 010032 125 kHz 125 kHz 250 kHz 010164 62.5 kHz 62.5 kHz 125 kHz 0110128 31.25 kHz 31.25 kHz 62.5 kHz 0111256 15.625 kHz 15.625 kHz 31.25 kHz 100024 166.67 kHz 166.67 kHz 333.33 kHz 10015800 kHz 800 kHz 1.6 MHz 101010 400 kHz 400 kHz 800 kHz 101120 200 kHz 200 kHz 400 kHz 110040 100 kHz 100 kHz 200 kHz 110180 50 kHz 50 kHz 100 kHz 1110160 25 kHz 25 kHz 50 kHz 1111320 12.5 kHz 12.5 kHz 25 kHz C1 C0 Icp (µA) (absolute value) MIN. TYP. MAX. 0 0 100 135 170 0 1 210 280 350 1 0 450 600 750 1 1 920 1230 1540 |
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