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CDCEL913PWG4 Folha de dados(PDF) 11 Page - Texas Instruments |
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CDCEL913PWG4 Folha de dados(HTML) 11 Page - Texas Instruments |
11 / 35 page CDCE913, CDCEL913 www.ti.com SCAS849F – JUNE 2007 – REVISED APRIL 2015 8.3 Feature Description 8.3.1 Control Terminal Configuration The CDCE913/CDCEL913 has three user-definable control terminals (S0, S1, and S2), which allow external control of device settings. They can be programmed to any of the following functions: • Spread-spectrum clocking selection → spread type and spread amount selection • Frequency selection → switching between any of two user-defined frequencies • Output state selection → output configuration and power-down control The user can predefine up to eight different control settings. Table 1 and Table 2 explain these settings. Table 1. Control Terminal Definition EXTERNAL CONTROL PLL1 SETTING Y1 SETTING BITS PLL frequency Control function SSC selection Output Y2/Y3 selection Output Y1 and power-down selection selection Table 2. PLLx Setting (Can Be Selected for Each PLL Individually)(1) SSCx [3 Bits] CENTER DOWN SSC SELECTION (CENTER/DOWN) 0 0 0 0% (off) 0% (off) 0 0 1 ±0.25% –0.25% 0 1 0 ±0.5% –0.5% 0 1 1 ±0.75% –0.75% 1 0 0 ±1.0% –1.0% 1 0 1 ±1.25% –1.25% 1 1 0 ±1.5% –1.5% 1 1 1 ±2.0% –2.0% (1) Center/down-spread, Frequency0/1 and State0/1 are user-definable in PLLx configuration register. Table 3. PLLx Setting, Frequency Selection (Can Be Selected for Each PLL Individually)(1) FSx FUNCTION 0 Frequency0 1 Frequency1 (1) Frequency0 and Frequency1 can be any frequency within the specified fVCO range. Table 4. PLLx Setting, Output Selection(1) (Y2 ... Y3) YxYx FUNCTION 0 State0 1 State1 (1) State0/1 selection is valid for both outputs of the corresponding PLL module and can be power down, 3-state, low ,or active. Table 5. Y1 Setting(1) Y1 SELECTION Y1 FUNCTION 0 State 0 1 State 1 (1) State0 and State1 are user definable in the generic configuration register and can be power down, 3-state, low, or active. Copyright © 2007–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: CDCE913 CDCEL913 |
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Descrição semelhante - CDCEL913PWG4 |
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