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CDCE949 数据表(PDF) 9 Page - Texas Instruments |
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CDCE949 数据表(HTML) 9 Page - Texas Instruments |
9 / 31 page www.ti.com APPLICATION INFORMATION Control Terminal Configuration CDCE949 CDCEL949 SCAS844 – JUNE 2007 The CDCE949/CDCEL949 has three user-definable control terminals (S0, S1 and S2) which allow external control of device settings. They can be programmed to perform 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 PLL2 Setting PLL3 Setting PLL4 Setting Y1 Setting Control Function 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 ... Y9) 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 9 Submit Documentation Feedback |
类似零件编号 - CDCE949 |
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类似说明 - CDCE949 |
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