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ML7344CE データシート(PDF) 67 Page - LAPIS Semiconductor Co., Ltd. |
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ML7344CE データシート(HTML) 67 Page - LAPIS Semiconductor Co., Ltd. |
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67 / 154 page  FEDL7344C/E/J-05 ML7344C/E/J 67/154 ●IF frequency setting IF frequency is 200kHz. IF frequency corresponds to each oepration frquency must be selected as below. Operating Frequency 169MHz (ML7344E) 315 to 450MHz (ML7344J) 470 t0 510MHz (ML7344C) PLL division setting [PLL_DIV_SET:B1 0x1A] 0x10 0x00 IF frequency setting [IF_FREQ_H/L:B0 0x54-55] 0x1F81 0x0FC0 IF frequency setting value can be calculated using the following formula: 20 2 ) 2 / ( _ ⋅ ⎪⎭ ⎪ ⎬ ⎫ ⎪⎩ ⎪ ⎨ ⎧ = ref IF f f FREQ IF (Integer part) Here FREQ IF _ : IF frequency setting : IF f IF frequency [MHz] : ref f PLL reference frequency (=master clock frequency: FMCK1) [Example] ML7344C/J IF_FREQ= {(0. 2MHz / 2) / 26MHz} * 220 (Integer part) = 4032 (0x0FC0) [IF_FREQ_H: B0 0x54] = 0x0F [IF_FREQ_L: B0 0x55] = 0xC0 [Example] ML7344E IF_FREQ= {(0. 2MHz / 2) / (26/2)MHz} * 220 (Integer part) = 8065 (0x1F81) [IF_FREQ_H: B0 0x54] = 0x1F [IF_FREQ_L: B0 0x55] = 0x81 |
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