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CDCEL913 Folha de dados(PDF) 9 Page - Texas Instruments

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Nome de Peças CDCEL913
Descrição Electrónicos  Programmable 1-PLL VCXO Clock Synthesizer With 1.8-V, 2.5-V, and 3.3-V Outputs
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
Logo TI - Texas Instruments

CDCEL913 Folha de dados(HTML) 9 Page - Texas Instruments

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APPLICATION INFORMATION
CONTROL TERMINAL CONFIGURATION
CDCE913
CDCEL913
SCAS849A – JUNE 2007 – REVISED AUGUST 2007
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 © 2007, Texas Instruments Incorporated
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Product Folder Link(s): CDCE913 CDCEL913


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