pnx1700 NXP Semiconductors, pnx1700 Datasheet - Page 76

• Manufacturer Part Number: pnx1700
• Description: Connected Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Volume 1 of 1
PNX17XX_SER_1
Preliminary 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
PNX1700 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 27
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 27: 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. 1 — 17 March 2006
F ceramic capacitor is recommended. A bulk 330 F capacitor
V
CCP
18
47 F
0.1 F
VSSA[5:0]
VCCA[5:0]
PNX1700
Chapter 1: Integrated Circuit Data
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
PNX17xx Series
1-49