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WM8980CGEFL/V bảng dữ liệu(PDF) 73 Page - Wolfson Microelectronics plc

tên linh kiện WM8980CGEFL/V
Giải thích chi tiết về linh kiện  Stereo CODEC with Speaker Driver and Video Buffer
PDF  123 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
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WM8980CGEFL/V bảng dữ liệu(HTML) 73 Page - Wolfson Microelectronics plc

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Pre-Production
WM8980
w
PP, Rev 3.8, May 2012
73
Figure 41 Video Buffer with 0dB Gain
Figure 42 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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