ADV7175A/ADV7176A

–38–

REV. B

For external buffering of the ADV7175A/ADV7176A DAC outputs, the configuration in Figure 71 is recommended. This configu-

ration shows the DAC outputs running at half (18 mA) their full current (36 mA) capability. This will allow the ADV7175A/ADV7176A

Ω and a R

Ω. This mode is recommended for

adds extra isolation on the video outputs, see buffer circuit in Figure 72. When calculating absolute output full current and voltage,

use the following equation:

= I

OUT

× R

LOAD

=

× K

()

K

= 4.2146 constant ,V

REF

= 1.235 V

ADV7175A/ADV7176A

DIGITAL

CORE

PIXEL

PORT

300

75

75

75

75

OUTPUT

BUFFER

DAC A

OUTPUT

BUFFER

OUTPUT

BUFFER

OUTPUT

BUFFER

DAC C

DAC D

DAC B

Figure 71. Output DAC Buffering Configuration

2N2907

75

75

OUTPUT TO

TV/MONITOR

36

INPUT

Figure 72. Recommended Output DAC Buffer

APPENDIX 7

OPTIONAL DAC BUFFERING