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CDCEL937-Q1 Fiches technique(PDF) 10 Page - Texas Instruments |
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CDCEL937-Q1 Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 30 page CDCE937-Q1 CDCEL937-Q1 SCAS892B – FEBRUARY 2010 – REVISED MAY 2010 www.ti.com APPLICATION INFORMATION CONTROL TERMINAL SETTING The CDCE937/CDCEL937 has three user-definable control terminals (S0, S1, and S2) that allow external control of device settings. They can be programmed to any of the following setting: • 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 PLL2 Setting PLL3 Setting Y1 Setting Bits PLL Output PLL Output PLL Output Output Y1 and Control SSC SSC SSC Frequency Y2/Y3 Frequency Y4/Y5 Frequency Y6/Y7 Power-Down Function Selection Selection Selection Selection Selection Selection Selection Selection 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 ... Y7) 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. 10 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): CDCE937-Q1 |
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