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ADV7191 데이터시트(PDF) 51 Page - Analog Devices

부품명 ADV7191
상세설명  Video Encoder with Six 10-Bit DACs and Video Encoder with Six DAC Outputs
PDF  69 Pages
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제조업체  AD [Analog Devices]
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ADV7191 데이터시트(HTML) 51 Page - Analog Devices

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ADV7190/ADV7191
–51–
REV. 0
APPENDIX 7
DAC BUFFERING
External buffering is needed on the ADV7190/ADV7191 DAC
outputs. The configuration in Figure 99 is recommended.
When calculating absolute output full-scale current and voltage
use the following equations:
VOUT = IOUT
× R
LOAD
IOUT = (VREF
× K)/R
SET
K = 4.2146 constant, VREF = 1.235 V
ADV7190/ADV7191
VREF
PIXEL
PORT
VAA
OUTPUT
BUFFER
DAC A
CVBS
CHROMA
G
LUMA
B
R
1.2k
RSET1
DAC B
DAC C
DAC D
DAC E
DAC F
DIGITAL
CORE
1.2k
RSET2
OUTPUT
BUFFER
OUTPUT
BUFFER
OUTPUT
BUFFER
OUTPUT
BUFFER
OUTPUT
BUFFER
Figure 99. Output DAC Buffering Configuration
OUTPUT TO
TV MONITOR
INPUT/
OPTIONAL
FILTER O/P
+VCC
AD8051
–VCC
NOTE: ALTERNATELY THE AD8051 OP AMP CAN BE USED
2
1
5
3
4
Figure 100. Recommended DAC Output Buffer Using an
Op Amp



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