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CDCEL913PWG4 Folha de dados(PDF) 11 Page - Texas Instruments

Nome de Peças CDCEL913PWG4
Descrição Electrónicos  Programmable 1-PLL VCXO Clock Synthesizer
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CDCE913, CDCEL913
www.ti.com
SCAS849F – JUNE 2007 – REVISED APRIL 2015
8.3 Feature Description
8.3.1 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
PLL1 SETTING
Y1 SETTING
BITS
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 Individually)(1)
SSCx [3 Bits]
CENTER
DOWN
SSC SELECTION (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%
(1)
Center/down-spread, Frequency0/1 and State0/1 are user-definable in PLLx configuration register.
Table 3. PLLx Setting, Frequency Selection (Can Be Selected for Each PLL
Individually)(1)
FSx
FUNCTION
0
Frequency0
1
Frequency1
(1)
Frequency0 and Frequency1 can be any frequency within the specified fVCO range.
Table 4. PLLx Setting, Output Selection(1) (Y2 ... Y3)
YxYx
FUNCTION
0
State0
1
State1
(1)
State0/1 selection is valid for both outputs of the corresponding PLL module and can be power down,
3-state, low ,or active.
Table 5. Y1 Setting(1)
Y1 SELECTION
Y1
FUNCTION
0
State 0
1
State 1
(1)
State0 and State1 are user definable in the generic configuration
register and can be power down, 3-state, low, or active.
Copyright © 2007–2015, Texas Instruments Incorporated
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