m52390fp Renesas Electronics Corporation., m52390fp Datasheet - Page 18

• Manufacturer Part Number: m52390fp
• Description: Ntsc/pal Encoder
• Manufacturer: Renesas Electronics Corporation.

M52390FP
(3) Setting the color difference LPF
The frequency characteristic of the color difference LPF built into this IC can be set as shown in Fig. 1, using the [20]
(fc CONT.) external resistor.
When doing this, the group delay characteristic also changes, as shown in Fig. 2.
(4) Setting Y DL
The group delay characteristic of the color signal of the RGB encoder output changes in response to the [20] (fc CONT)
external resistor, so Y DL should be set in such a way that the group delay characteristic is the amount of group delay
obtained from the group delay characteristic of Fig. 2, with 40 ns added.
Also, if the [6] (TRAP) circuit is being added, a further delay of +5 to +10 ns should be taken into consideration.
(5) COLOR CONT characteristic
The gain of the chroma unit can be set as shown in Fig. 3, using the [19] (COLOR CONT) applied voltage. (The burst
amplitude is constant.)
Rev.1.0, Sep.22.2003, page 18 of 22