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LMX2531LQ1500E データシート(PDF) 18 Page - National Semiconductor (TI) |
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LMX2531LQ1500E データシート(HTML) 18 Page - National Semiconductor (TI) |
18 / 23 page 2.0 General Programming Information (Continued) 2.5 REGISTER R4 2.5.1 TOC[13:0] -- Time Out Counter for FastLock When the value of this word is 3 or less, then FastLock is disabled, and this pin can only be used for general purpose I/O. When this value is 4 or greater, the time out counter is engaged for the amount of phase detector cycles shown in the table below. TOC Value FLout Pin State Timeout Count 0 High Impedance 0 1 Low Always Enabled 2 Low 0 3 High 0 4 Low 4 X 2 Phase Detector ... 16383 Low 16383 X 2 Phase Detector When this count is active, the FLout Pin is grounded, the FastLock current is engaged, and the resistors R3 and R4 are also potentially changed. The table below summarizes the bits that control various values in and out of FastLock differences. FastLock State FLout Charge Pump Current R3 R4 Steady State High Impedance ICP R3_ADJ R4_ADJ Fastlock Grounded ICPFL R3_ADJ_FL R4_ADJ_FL 2.5.2 ICPFL[3:0] -- Charge Pump Current for Fastlock When FastLock is enabled, this is the charge pump current that is used for faster lock time. ICPFL Fastlock Charge Pump State Typical Fastlock Charge Pump Current at 3 Volts (µA) 01X 90 1 2X 180 2 3X 270 3 4X 360 4 5X 450 5 6X 540 6 7X 630 7 8X 720 8 9X 810 9 10X 900 10 11X 990 11 12X 1080 12 13X 1170 13 14X 1260 14 15X 1350 15 16X 1440 www.national.com 18 |
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同様の説明 - LMX2531LQ1500E |
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