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CDCE925PWRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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CDCE925PWRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 27 page CDCE925 CDCEL925 SCAS847F – JULY 2007 – REVISED MARCH 2010 www.ti.com APPLICATION INFORMATION CONTROL TERMINAL SETTING The CDCE925/CDCEL925 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 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 PLL1 Setting PLL2 Setting Y1 Setting Control Bits Control PLL Frequency SSC Output Y2/Y3 PLL Frequency SSC Output Y4/Y5 Output Y1 and Function Selection Selection Selection Selection Selection Selection Power-Down Selection Table 2. PLL 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 ... Y5) 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 © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): CDCE925 CDCEL925 |
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