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LMX1601TM Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LMX1601TM Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 14 page 2.0 Programming Description (Continued) 2.3.4 MAIN_N Register If the Control Bits (CTL[1:0]) are 1 1 when LE transitions high, data is transferred from the 18-bit shift register into the MAIN_N register latch which sets 16-bit programmable N divider value. The Main N divider is a 16-bit counter which is fully programmable from 992 to 65,535 for 2 GHz option and from 240 to 65,535 for 1.1 GHz option. The MAIN_N register consists of the 5-bit (2 GHz option) or 4-bit (1.1 GHz option) swallow counter (MAIN_A_CNTR) and the 11-bit (2 GHz option) or 12-bit (1.1 GHz option) pro- grammable counter (MAIN_B_CNTR). Serial data format for the MAIN_N register latch shown below. The divide ratio must be ≥ 992 (2 GHz option) or 240 (1.1 GHz option) for a continuous divide range. The divide ratio is programmed using the bits MAIN _A_CNTR and MAIN_B_CNTR as shown in tables 2.3.5 and 2.3.6 The pulse swallow function which determines the divide ratio is described in Section 2.3.7. 2 GHz option First Bit SHIFT REGISTER BIT LOCATION Last Bit 17 16 15 14 13 12 11 10 9876543210 MAIN_N AUX_B_CNTR[10:0] AUX_A_CNTR[4:0] 1 1 1.1 GHz option First Bit SHIFT REGISTER BIT LOCATION Last Bit 17 16 15 14 13 12 11 10 9876543210 MAIN_N AUX_B_CNTR[11:0] AUX_A_CNTR[3:0] 1 1 2.3.5 Swallow Counter Divide Ratio (Main A COUNTER) 2 GHz option (5 bit) Swallow MAIN_A_CNTR Count (A) 4 3 2 1 0 0 0 0 000 1 0 0 001 • • • ••• 31 1 1 111 Note 11: Swallow Counter Value: 0 to 31 1.1 GHz option (4 bit) Swallow MAIN_A_CNTR Count (A) 3210 0 0000 1 0001 • •••• 15 1111 Note 12: Swallow Counter Value: 0 to 15 2.3.6 Programmable Counter Divide Ratio (Main B COUNTER) 2 GHz option (11 bit) MAIN_B_CNTR Divide Ratio 10 9876543210 3 00000000011 4 00000000100 • ••••••••••• 2,047 11111111111 Note 13: Divide ratio: 3 to 2,047 (Divide ratios less than 3 are prohibited) MAIN_B_CNTR ≥ MAIN_A_CNTR. See section 2.3.7 for calculation of VCO output frequency. www.national.com 8 |
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