ADV7191 Analog Devices, ADV7191 Datasheet - Page 51

• Manufacturer Part Number: ADV7191
• Description: Video Encoder with Six 10-Bit DACs and Video Encoder with Six DAC Outputs
• Manufacturer: Analog Devices

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:
1.2k
1.2k
PIXEL
PORT
R
R
SET1
SET2
V
K = 4.2146 constant, V
REF
DIGITAL
ADV7190/ADV7191
CORE
I
OUT
V
V
OUT
AA
= (V
= I
DAC A
DAC B
DAC C
DAC D
DAC E
DAC F
REF
OUT
× K)/R
× R
REF
LOAD
= 1.235 V
SET
OUTPUT
BUFFER
OUTPUT
BUFFER
OUTPUT
BUFFER
OUTPUT
BUFFER
OUTPUT
BUFFER
OUTPUT
BUFFER
CVBS
LUMA
CHROMA
G
B
R
DAC BUFFERING
APPENDIX 7
FILTER O/P
OPTIONAL
NOTE: ALTERNATELY THE AD8051 OP AMP CAN BE USED
INPUT/
4
3
AD8051
–V
+V
ADV7190/ADV7191
CC
CC
5
2
1
OUTPUT TO
TV MONITOR