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AD8193-EVALZ 데이터시트(PDF) 10 Page - Analog Devices |
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AD8193-EVALZ 데이터시트(HTML) 10 Page - Analog Devices |
10 / 16 page AD8193 Rev. 0 | Page 10 of 16 OUTPUT CHANNELS Each high speed output differential pair is terminated to the 3.3 V VTTO power supply through two single-ended 50 Ω on-chip resistors, as shown in Figure 20. These matched on- chip back-terminations absorb reflections on the output TMDS channels and improve the overall system signal integrity. These termination resistors are always present in the outputs and they cannot be switched out. OP[3:0] ON[3:0] AVEE 50Ω VTTO 50Ω IOUT Figure 20. High Speed Output Simplified Schematic In a typical application, the AD8193 output is connected to the input of an HDMI/DVI receiver, which provides a second set of matched terminations in accordance with the HDMI 1.3 specification. If no receiver is connected, each of the AD8193 output pins should be tied to 3.3 V through a 50 Ω on-board termination resistor. SWITCHING MODE The source selector pin, S_SEL, is used to select which of the two input groups is routed to the output. Source A is selected when S_SEL is pulled up to logic high, and Source B is selected when S_SEL is pulled down to logic low. Logic levels for this pin are set in accordance with the specifications listed in Table 5. The AD8193 can be used as a single-link TMDS buffer by setting S_SEL to one fixed logic value. S_SEL also controls the switch status of the input termination resistors. The termination resistors for the selected input are always connected, whereas the termination resistors for the unselected input are always switched out (high-Z inputs). Table 5. S_SEL Description S_SEL Selected Input Input Termination Status 0 Input B Input B terminations enabled, Input A terminations disabled 1 Input A Input A terminations enabled, Input B terminations disabled |
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