LMH2190TM-38 NSC [National Semiconductor], LMH2190TM-38 Datasheet - Page 21

• Manufacturer Part Number: LMH2190TM-38
• Description: Quad Channel 27 MHz Clock Tree Driver with I2C Interface
• Manufacturer: NSC [National Semiconductor]

LAYOUT RECOMMENDATIONS
As with any other device, careful attention must be paid to the
board layout. If the board isn't properly designed, the perfor-
mance of the device can be less than might be expected.
Especially the input clock trace (SCLK_IN) and output traces
(CLK1/2/3/4) should be as short as possible to reduce the
capacitive load observed by the clock outputs. Also proper
decoupling close to the device is necessary. Beside a capac-
C
BAT
, C
OUT
: Low-ESR Surface-Mount Ceramic Capacitors (MLCC's) used in setting electrical characteristics.
Symbol
C
C
ESR
C
BAT
OUT
SCLK_IN
Parameter
Capacitor on V
Capacitor on V
Equivalent Series Resistance
Input AC Coupling Capacitor
TABLE 8. Recommended Component Values
BAT
OUT
21
itor in the µF range (See
V
alent series resistance (ESR) of the capacitors should be
sufficiently low. A standard capacitor is usually adequate. Ad-
vised values are given in
available to ease evaluation and demonstrate a proper board
layout.
0.47
Min
330
BAT
1
5
and V
OUT
Typ
470
2.2
1
is recommended close to device. The equiv-
10000
Max
500
Table
Table
8), a capacitor of 100 nF on
8. An evaluation board is
Units
mΩ
µF
pF
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