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ADV7192KST Datasheet(PDF) 52 Page - Analog Devices

Part # ADV7192KST
Description  Video Encoder with Six 10-Bit DACs, 54 MHz Oversampling and Progressive Scan Inputs
PDF  69 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADV7192KST Datasheet(HTML) 52 Page - Analog Devices

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ADV7192
–52–
REV. 0
APPENDIX 7
DAC BUFFERING
External buffering is needed on the ADV7192 DAC outputs.
The configuration in Figure 106 is recommended.
When calculating absolute output full-scale current and voltage
use the following equations:
VOUT = IOUT
× RLOAD
IOUT = (VREF
× K)/RSET
K = 4.2146 constant, VREF = 1.235 V
ADV7192
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 106. Output DAC Buffering Configuration
OUTPUT TO
TV MONITOR
INPUT/
OPTIONAL
FILTER O/P
+VCC
AD8051
–VCC
1
5
4
3
2
Figure 107. Recommended DAC Output Buffer Using an
Op Amp



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