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CDCE72010 Scheda tecnica(PDF) 53 Page - Texas Instruments

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Il numero della parte CDCE72010
Spiegazioni elettronici  Ten Output High Performance Clock Synchronizer, Jitter Cleaner, and Clock Distributor
PDF  70 Pages
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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CDCE72010 Scheda tecnica(HTML) 53 Page - Texas Instruments

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CHARGE PUMP
CDCE72010
www.ti.com...................................................................................................................................................................................................... SCAS858 – JUNE 2008
The Charge Pump drives the loop filter that controls the external VCO/VCXO. The Charge pump frequency is
determined by the PFD frequency since the function of the charge pump is to translate the UP DOWN signals of
the PFD into current pulses that drives the external filter. The Charge pump current is set by the control vector
ICP [3:0]. The error amplifier operates from 0.7V to the VDD supply voltage. See the table below for ICP settings.
Table 13. CP, Charge Pump Current (Register 0 RAM Bits [17:14])
TYPICAL CHARGE PUMP
ICP3
ICP2
ICP1
ICP0
CURRENT
0
0
0
0
0
µA (3-State)
0
0
0
1
200
µA
0
0
1
0
400
µA
0
0
1
1
600
µA
0
1
0
0
800
µA
0
1
0
1
1.0 mA
0
1
1
0
1.2 mA
0
1
1
1
1.4 mA
1
0
0
0
1.6 mA
1
0
0
1
1.8 mA
1
0
1
0
2.0 mA
1
0
1
1
2.2 mA(1)
1
1
0
0
2.4 mA
1
1
0
1
2.6 mA
1
1
1
0
2.8 mA
1
1
1
1
3.0 mA
(1)
Default
The ‘Preset Charge-Pump to VCC_CP/2 is a useful feature to quickly set the center frequency of the VC(X)O after
Power-up or Reset. The adequate control voltage for the VC(X)O will be provided to the Charge-Pump output by
an internal voltage divider of 1K
Ω/1KΩ to VCC_CP and GND (VCC_CP/2).
This feature helps to get the initial frequency accuracy, i.e. required at CPRI (Common Public Radio Interface) or
OBSAI (Open Base Station Architecture Initiative).
The Preset Charge-Pump to VCC_CP/2 can be set and reset by SPI register.
Copyright © 2008, Texas Instruments Incorporated
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