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SI5341 数据表(PDF) 9 Page - Silicon Laboratories |
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SI5341 数据表(HTML) 9 Page - Silicon Laboratories |
9 / 53 page 3.5 Outputs The Si5341 supports 10 differential output drivers which can be independently configured as differential or LVCMOS. The Si5340 sup- ports 4 output drivers independently configurable as differential or LVCMOS. 3.5.1 Output Signal Format The differential output amplitude and common mode voltage are both fully programmable and compatible with a wide variety of signal formats including LVDS and LVPECL. In addition to supporting differential signals, any of the outputs can be configured as LVCMOS (3.3 V, 2.5 V, or 1.8 V) drivers providing up to 20 single-ended outputs, or any combination of differential and single-ended outputs. 3.5.2 Differential Output Terminations The differential output drivers support both ac-coupled and dc-coupled terminations as shown in the figure below. 100 50 50 Internally self-biased AC Coupled LVDS/LVPECL 50 50 AC Coupled LVPECL/CML VDD– 1.3V 50 50 50 50 100 DC Coupled LVDS OUTx OUTxb OUTx OUTxb OUTx OUTxb VDDO = 3.3V , 2.5V , 1.8V VDDO = 3.3V , 2.5V VDDO = 3.3V , 2.5V , 1.8V Si5341/40 Si5341/40 Si5341/40 AC Coupled HCSL R1 OUTx OUTxb VDDO = 3.3V,2.5V,1.8V Si5341/40 50 50 R1 R2 R2 VDDRX Standard HCSL Receiver VDDRX Option1 For VCM = 0. 37V 3. 3 V 2. 5 V 1. 8 V 442 ohms 332 ohms 243 ohms 56.2 ohms 59 ohms 63.4 ohms R1 R2 Figure 3.5. Supported Differential Output Terminations 3.5.3 Programmable Common Mode Voltage for Differential Outputs The common mode voltage (VCM) for the differential modes are programmable so that LVDS specifications can be met and for the best signal integrity with different supply voltages. When dc coupling the output driver it is essential that the receiver should have a relatively high common mode impedance so that the common mode current from the output driver is very small. Si5341/40 Rev D Data Sheet Functional Description silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 8 |
类似零件编号 - SI5341 |
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类似说明 - SI5341 |
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