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LMX1602 bảng dữ liệu(PDF) 10 Page - Texas Instruments |
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LMX1602 bảng dữ liệu(HTML) 10 Page - Texas Instruments |
10 / 18 page OBSOLETE LMX1600, LMX1601, LMX1602 SNAS017F – MARCH 1998 – REVISED APRIL 2013 www.ti.com Table 2. 500 MHz Option(1) Swallow AUX_A_CNTR Count(2) (A) 3 2 1 0 0 X 0 0 0 1 X 0 0 1 • • • • • 7 X 1 1 1 (1) X = Don't Care condition (2) Swallow Counter Value: 0 to 7 12-BIT Programmable Counter Divide Ratio (Aux B COUNTER) AUX_B_CNTR(1)(2) Divide Ratio(3) 11 10 9 8 7 6 5 4 3 2 1 0 3 0 0 0 0 0 0 0 0 0 0 1 1 4 0 0 0 0 0 0 0 0 0 1 0 0 • • • • • • • • • • • • • 4,095 1 1 1 1 1 1 1 1 1 1 1 1 (1) AUX_B_CNTR ≥ AUX_A_CNTR (2) See PROGRAMMABLE FEEDBACK (N) DIVIDERS for calculation of VCO output frequency (3) Divide ratio: 3 to 4,095 (Divide ratios less than 3 are prohibited) 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) programmable 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 Swallow Counter Divide Ratio (Main A COUNTER) and Programmable Counter Divide Ratio (Main B COUNTER). The pulse swallow function which determines the divide ratio is described in Pulse Swallow Function. Table 3. 2 GHz Option First Bit SHIFT REGISTER BIT LOCATION Last Bit 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MAIN_N AUX_B_CNTR[10:0] AUX_A_CNTR[4:0] 1 1 Table 4. 1.1 GHz Option First Bit SHIFT REGISTER BIT LOCATION Last Bit 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MAIN_N AUX_B_CNTR[11:0] AUX_A_CNTR[3:0] 1 1 10 Submit Documentation Feedback Copyright © 1998–2013, Texas Instruments Incorporated Product Folder Links: LMX1600 LMX1601 LMX1602 |
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Mô tả tương tự - LMX1602 |
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