- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
28
3.9.2. Circuit Configuration for Component Output
When component output is used (DACMODE=1[h]), the CXD3172AR’s internal DAC (2ch) outputs Y/C signals
through the IOY pin (pin 75) and IOC pin (pin 67), respectively.
illustrates an example circuit for
component output.
The signal level output from the IOY/IOC pins changes depending on the setting for the voltage being input to
the VREFY/VREFC pins. Input and adjust the voltage as appropriate.
Note that the voltage input to the VREFY/VREFC pins must be in the range of 0.6 to 1.1V based on the
specifications for the CXD3172AR’s internal DAC. Therefore, use a configuration in which an amplifier circuit is
placed in the final stage. Note that proper operations cannot be guaranteed if the voltage is input using any
other type of configuration.
Fig 3.9-1 Example Circuit for Component Output
CXD3172AR
IO
C
67
3.3V
220
0.1u
VIDEO AMP
3.3k
BPF
AVS
6
65
IREFY
71
3.3k
VREFY
73
Voltage is inputted.
IOY
75
220
0.1u
VIDEO AMP
AVD6
74
3.3V
VGY
72
0.1u
3.3V
0.1u
3.3V
69
VGC
VREFC
68
Voltage is
inputted.
IRE
F
C
70
3.3k