PNX1500E NXP Semiconductors, PNX1500E Datasheet - Page 75
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PNX1500E
Manufacturer Part Number
PNX1500E
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1500E.pdf
(828 pages)
Specifications of PNX1500E
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NXP Semiconductors
Volume 1 of 1
PNX15XX_PNX952X_SER_N_4
Product data sheet
10.2.1 The 3.3 V Analog Supply
10.2.2 The SoC Core, VDDA, Analog Supply
10.2 Analog Supplies
Other devices like the DDR memory devices also require local decoupling capacitors.
At least eight 0.1 F capacitors (one for each VDD or VDDQ) combined with one 22
additional eight 0.01
per device is also recommended.
Additional global decoupling can also be distributed across the board.
The entire analog ground/supply is kept free-floating on the PCB.
Quiet VCCA for the PLL subsystem should be supplied from VCCP through a 18
series resistor. It should be bypassed for AC to VSSA, using a dual capacitor bypass
(hi and low frequency AC bypass).
Quiet VSSA for the PLL subsystem: the bypass should only be connected to the
PNX1500 VSSA[] pins and not to the global VSS (i.e. ground) network. No external
coil or other connection to board ground is needed, such connection would create a
ground loop.
Figure 26
one 0.1 F is sufficient for the 6 VCCA[] pins.
The entire analog ground/supply is kept free-floating on the PCB.
F or 47 F are recommended for each memory device. If board space allows an
Figure 26: Digital VCCP Power Supply to Analog VCCA/VSSA Power Supply Filter
illustrates the analog filtering for the 3.3 V Analog Supply. One 47 F and
Rev. 4.0 — 03 December 2007
F ceramic capacitor is recommended. A bulk 330 F capacitor
V
CCP
18
47 F
0.1 F
VSSA[5:0]
VCCA[5:0]
PNX1500
PNX15xx/952x Series
Chapter 1: Integrated Circuit Data
© NXP B.V. 2007. All rights reserved.
1-75
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