5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
Title
Size
Document Number
Rev
Date:
Sheet
of
QUANTA
COMPUTER
JM7B
2A
Thursday, September 14, 2006
Change list
5
5
Title
Size
Document Number
Rev
Date:
Sheet
of
QUANTA
COMPUTER
JM7B
2A
Thursday, September 14, 2006
Change list
5
5
Title
Size
Document Number
Rev
Date:
Sheet
of
QUANTA
COMPUTER
JM7B
2A
Thursday, September 14, 2006
Change list
5
5
JM7B
Item
Page
ECN Number
Date
Rev.
Issue Description
Solution Description
Model
Item Id
Populate PR54 with zero Ohms to change switching frequency from 300kHz to
500kHz on +3.3V_ALWP.
Change PQ21 to BSC079N03. This FET package will require a layout change.
WI90729
Change switching freq and hi-side FET for +3.3V_ALWP.Intersil has
discovered an errata in the controller that produces a problem when using
300kHz at 3.3V. They are still digging into the details, but feel confident they
can remove this problem with a silicon change. They have assured us we
will not have any problem switching at 500kHz at 3.3V. We will, however,
need to provide a better FET package that will perform well at this
frequency.
2A
52
9/11/2006
9/12/2006
75
Add L64 in series with R441.
LAY X01- WWAN Noise- Clock. Add ferrite bead in series with R492.
2A
WI90831
9/12/2006
17
76
Add C871~C876 for USB OC.
Add C867~C870 in parellel to C813.
Add C748,C864~C866 in parellel to C825.
LAY X01- WWAN Noise - ICH improvements.
Add one .1 uF cap on each USB OC (over current) trace near the ICH.
Add 4 .1uF caps in parellel to C661(UMA)/C813(Disc) close to the ICH pins.
Add 4 .1uF caps in parellel to C674(UMA)/C825(Disc) close to the ICH pins.
2A
WI90828
9/12/2006
12,14
77
Done.
WWAN Noise - LOM continued.
Try to add one more cap (1 uF) on each analog voltage input to 5755
(1.2V_AVDDL, 1.2V_GPHY_PLLVDD, 1.2V_PCIE_PLLVDD, 1.2V_PCIE_SDSVDD,
2.5V_BIASVDD, 2.5V_XTALVDD, 2.5V_AVDD)
2A
WI90824
9/12/2006
40
78
1).Change the package of L18 from 0603 to 0805 and use BLM21PG600SN1D
instead of BLM18AG601SN1D.
2). Add C168 near L14 and U30.F12
LAY X01- WWAN Noise - LOM improvement.
1) +2.5V_XTALVDD: Change L18 to 0805 package ( larger variety of values
available in this package size).
2) +2.5V_AVDD: Add one more 0402 capacitor near L14 and U30.F12
2A
WI90823
9/12/2006
40
79