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Si5340B-D-GM Arkusz danych(PDF) 10 Page - Silicon Laboratories

Numer części Si5340B-D-GM
Szczegółowy opis  Low-Jitter, 10 or 4-Output, Any-Frequency, Any-Output Clock Generator
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Producent  SILABS [Silicon Laboratories]
Strona internetowa  http://www.silabs.com
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3.5.4 LVCMOS Output Terminations
LVCMOS outputs are typically dc-coupled, as shown in the figure below.
3.3V , 2.5V , 1.8 V
LVCMOS
VDDO =3.3V , 2.5V , 1.8V
50
Rs
50
Rs
DC Coupled LVCMOS
OUTx
OUTxb
Figure 3.6. LVCMOS Output Terminations
3.5.5 LVCMOS Output Impedance and Drive Strength Selection
Each LVCMOS driver has a configurable output impedance. It is highly recommended that the minimum output impedance (strongest
drive setting) is selected and a suitable series resistor (Rs) is chosen to match the trace impedance.
Table 3.2. Nominal Output Impedance vs. OUTx_CMOS_DRV (register)
VDDO
CMOS_DRIVE_Selection
OUTx_CMOS_DRV=1
OUTx_CMOS_DRV=2
OUTx_CMOS_DRV=3
3.3 V
38 Ω
30 Ω
22 Ω
2.5 V
43 Ω
35 Ω
24 Ω
1.8 V
46 Ω
31 Ω
Note: Refer to the Si5340/41 Family Reference Manual for more information on register settings.
3.5.6 LVCMOS Output Signal Swing
The signal swing (VOL/VOH) of the LVCMOS output drivers is set by the voltage on the VDDO pins. Each output driver has its own
VDDO pin allowing a unique output voltage swing for each of the LVCMOS drivers.
3.5.7 LVCMOS Output Polarity
When a driver is configured as an LVCMOS output it generates a clock signal on both pins (OUTx and OUTxb). By default the clock on
the OUTxb pin is generated with complementary polarity with the clock on the OUTx pin. The LVCMOS OUTx and OUTxb outputs can
also be generated in phase.
3.5.8 Output Enable/Disable
The OEb pin provides a convenient method of disabling or enabling the output drivers. When the OEb pin is held high all outputs will be
disabled. When held low, the outputs will be enabled. Outputs in the enabled state can be individually disabled through register control.
3.5.9 Output Driver State When Disabled
The disabled state of an output driver is configurable as: disable low or disable high.
Si5341/40 Rev D Data Sheet
Functional Description
silabs.com | Smart. Connected. Energy-friendly.
Rev. 1.0 | 9


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