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CDCEL913-Q1 Folha de dados(PDF) 11 Page - Texas Instruments |
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CDCEL913-Q1 Folha de dados(HTML) 11 Page - Texas Instruments |
11 / 26 page CDCEL913-Q1 www.ti.com SCAS888 – SEPTEMBER 2009 APPLICATION INFORMATION 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 Bits PLL1 Setting Y1Setting 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 individual)(1) SSC Selection (Center/Down) SSCx [3-bits] 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% FREQUENCY SELECTION(2) FSx FUNCTION 0 Frequency0 1 Frequency1 OUTPUT SELECTION(3) (Y2 ... Y3) YxYx FUNCTION 0 State0 1 State1 (1) Center/Down-Spread, Frequency0/1 and State0/1 are user-definable in PLLx Configuration Register; (2) Frequency0 and Frequency1 can be any frequency within the specified fVCO range. (3) State0/1 selection is valid for both outputs of the corresponding PLL module and can be power down, 3-state, low or active Table 3. Y1 Setting(1) Y1 SELECTION Y1 FUNCTION 0 State 0 1 State 1 (1) State0 and State1 are user definable in Generic Configuration Register and can be power down, 3-state, low, or active. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): CDCEL913-Q1 |
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Descrição semelhante - CDCEL913-Q1 |
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