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Si5340C-D-GM Arkusz danych(PDF) 10 Page - Silicon Laboratories |
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Si5340C-D-GM Arkusz danych(HTML) 10 Page - Silicon Laboratories |
10 / 53 page 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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