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TDA7421 数据表(PDF) 23 Page - STMicroelectronics |
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TDA7421 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 38 page  LOCK DETECTOR & PLL MODE CONTROL MSB LSB FUNCTION D7 D6 D5 D4 D3 D2 D1 D0 0 0 PLL standby mode 0 1 PLL AM 1 0 not used 1 1 PLL FM mode 0 0 PD phase difference threshold 10ns 0 1 PD phase difference threshold 20ns 1 0 PD phase difference threshold 30ns 1 1 PD phase difference threshold 40ns 0 0 Not used in application mode 0 1 Activation delay = 4 ⋅ fref 1 0 Activation delay = 6 ⋅ fref 1 1 Activation delay = 8 ⋅ fref 0 No lock detector controlled chargepump 1 Lock detector controlled chargepump LDENA D3 D2 D1 D0 PM1 PM0 Bit name Subaddress = 05H IF COUNTER REFERENCE CONTROL 1 (LSB) MSB LSB FUNCTION D7 D6 D5 D4 D3 D2 D1 D0 00 000000 LSB = 0 00 000001 LSB = 1 00 000010 LSB = 2 all combinations allowed • • • 11 111100 LSB = 252 11 111101 LSB = 253 11 111110 LSB = 254 11 111111 LSB = 255 IRC7 IRC6 IRC5 IRC4 IRC3 IRC2 IRC1 IRC0 Bit name Subaddress = 06H TDA7421 23/38 |
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