M52390FP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M52390FP

NTSC/PAL ENCODER

MITSUBISHI ELECTRIC  

MITSUBISHI ICs (AV COMMON)

M52390FP

NTSC/PAL ENCODER

(2) Setting of free run frequency

In this IC, the VCXO circuit generates fsc. Therefore, set the

oscillator frequency of VCXO to fsc as follows before using this IC.

1) Connect pin 9 (VIDEO IN) to GND and set it to free run mode.

2) V4 is the voltage at pin 4 (OFFSET R) when sync is input to

pin 2 (C.Sync IN). Apply voltage V4 - 0.5V to pin 4 (OFFSET

R).

3) Set pin 2 (C.Sync IN) to H. (5V is applied.)

4) Set the output frequency at pin 5 (TRAP) by adjusting the

trimmer capacitor at pin 7 (VCXO IN).

(3)Setting of chroma difference LPF

The frequency characteristics of the chroma difference LPF which

is built in this IC can be set as shown in Fig. 1 by connecting a

resistor externally to pin 20 (fc CONT.).

The group delay characteristics also change as shown in Fig. 2.

6

0

-6

60k

50k

40k

-12

30k

20k

10k

5k

-18

-24

-30

100k

1M

10M

Fig. 1 Frequency characteristics of

color difference LPF

(As for the test conditions, refer to test No.14 and 15.)

(4) Setting of Y DL

The group delay characteristics of color signal of RGB encode

output changes by connecting a resistor externally to pin 20 (fc

CONT.). Therefore, set Y DL based on the delay volume (group

delay volume derived from group delay characteristics + 40ns).

In case that a trap circuit is connected to pin 5 , take the delay

from +5 to +10ns into consideration.

(5) Color control characteristics

Gain in chroma section can be set as shown in Fig. 3 by applying

voltage to pin 19 (COLOR CONT.). (The burst amplitude is fixed.)

3

2

1

0

-1

-2

-3

0

1

2

3

4

5

Voltage at pin 19

Fig. 3 Color control characteristics

(As for the test conditions, refer to test No.16, 17, 18 and 19.)

(6) Relation between BFP and HHK

The pulse width of GFP and HHK can be set as shown in Fig. 4 by

connecting DR externally to pin 3 (HHK).

500

400

300

200

100

0 5 10 20 30 40 50 60

Pin 20 R (kΩ)

Fig. 2 Group delay characteristics of

color difference LPF

(As for the test conditions, refer to test No.14 and 15.)

130

BFPP BFPW

120

110

100 5.6µs

90

80

70

HHK

47µs

3

270p

R

2.5µs

5V

pin 2 Sync

0V

0 10 20 30 40 50 60

Time interval from sync rise at pin 2 (47µsec)

Fig. 4 RC product at pin 3 vs. internal pulse

(As for the test conditions, refer to test No.35, 36 and 37.)

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