stcd1020 STMicroelectronics, stcd1020 Datasheet - Page 12

• Manufacturer Part Number: stcd1020
• Description: Multi-channel Clock Distribution Circuit
• Manufacturer: STMicroelectronics

3.2
Note:
12/40
Figure 8.
Connection of the source clock to MCLK
If the output of the clock source voltage level is within the supply rails of the STCD1020,
STCD1030 and STCD1040, the output of the source clock should be connected directly to
the MCLK of the clock distribution circuits. This is described in
connection of the source clock is the common case and a DC-CUT capacitor is saved on
PCB.
Figure 9.
The input clock voltage level of the STCD1020, STCD1030, and STCD1040 cannot exceed
the supply rails when it is directly connected to the source clock. If it is needed to connect a
source clock with the voltage level exceeds the supply rails of the clock distribution circuits,
the user needs to connect a DC-CUT capacitor serially as shown in
divider formed by a resistor string is also needed to set a proper DC bias for the clock input
Typical application circuit using STCD1040 for baseband peripherals in
mobile phone
Direct connection of the source clock
VCTCXO
VCTCXO
OUT
STCD1040 EN4
MCLK
GND
V CC
V CC
CLK2
CLK3
CLK4
CLK1
MCLK
EN2
EN3
EN1
STCD1020
STCD1030
STCD1040
V CC
BT_External_Req
WLAN
GPS
Bluetooth
Figure
Other
device
Figure
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9. The direct
ai13955
10. A voltage