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WM8980 Datasheet(PDF) 68 Page - Wolfson Microelectronics plc |
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WM8980 Datasheet(HTML) 68 Page - Wolfson Microelectronics plc |
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68 / 112 page  WM8980 Pre-Production w PP Rev 3.1 March 2007 68 Figure 38 Video Buffer with 0dB Gain Figure 39 Video Buffer with 6dB Gain The outputs VBREF and VBOUT are current mirrored transistors with a 5:1 ratio, so that: iVBOUT = 5 x iVBREF. A reference resistor (187R in above examples) is used for feedback on the video buffer amplifier via the VBREF pin. The output current from VBOUT will be split between the source termination and load termination (75R each in above examples). Overall voltage gain (i.e. VBIN to TV input) is calculated as follows: VBGAIN (R40[1]) LOADED GAIN FORMULA (SOURCE AND LOAD BOTH TERMINATED WITH 75R) LOADED GAIN (VREF=187R; RSOURCE=75R; RLOAD=75R) UNLOADED GAIN (VREF=187R; RSOURCE=75R; RLOAD=0) 0 5 x (RLOAD || RSOURCE) / RVBREF 0dB +6dB 1 10 x (RLOAD || RSOURCE) / RVBREF +6dB +12dB See applications note WAN-0166 for further information. |
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