M52779SP View Datasheet(PDF) - MITSUBISHI ELECTRIC
Part Name
Description
Manufacturer
M52779SP Datasheet PDF : 37 Pages
| |||
MITSUBISHI ICs (TV)
M52779SP
VIF, SIF, VIDEO, CHROMA, DEFLECTION FOR PAL/NTSC
VBLKW Vertical blanking width
Output waveform at
pins 21, 22 and 23
M
GND
Note: The timing and pulse width of the horizontal blanking pulse
should be as shown in the following figure by adjusting the variable
resistor of the single shot multi vibrator.
PIN 13
Horizontal
output
AVER5 50/60 identification 5, AVER1 50/60 identification 1
AVER2 50/60 identification 2, AVER3 50/60 identification 3,
AVER4 50/60 identification 4
Confirm that the frequency of output at pin 18 is the same at each
input frequency (pull-in state). Also, confirm the state of the bus
8µs
read mode (D7).
WVSS Vertical sync.detection minimum width
Change the input pulse width of SGd and measure the input pulse
width at the moment when the output signal at pin 18 and the input
signal at pin 39 are pulled in.
Horizontal
blanking pulse
Rsi1 Vertical ramp size
Measure the pin18 amplitude.
Rs1 Vertical ramp size control range
1. Measure the pin 18 amplitude. (size data : max and min)
2. Rs1= Pin18 size max-pin18 size min ×100(%)
Rsi1
Rpo1 Vertical ramp position control range
1. Measure the pin 18 top voltage. ( position data : max and min )
2. Rpo1=pin 18 posi max - pin 18 posi min (mv)
Rgc Vertical position center adjustment
1. Adjust the position bus data so that the output DC bias current at
pin18 and pin 19 should be equal.
2. Specify this position bus data adjusted above.
Rgr Vertical ramp out pulse width (PAL)
Measure the output pulse width
at pin 18, when 43kΩ at pin 10
is connected to 8V (VCC).
12µs
The variable resistor at pin 15 of the TTL IC, M74LS221P, is used to
fix the timing at 8µs and that at pin 7 is used to fix the pulse width at
12µs.
∗Coil adjustment
VCO COIL
1. Set the test conditions as shown in the parameter V14.
2. Input CW (fo=38.9MHz, Vi=90dBµ) to input pin A.
3. Set the DC voltage at pin 1 (AFT OUT) to 1/2Vcc (4.0V) by
adjusting VCO coil.
Voltage
PIN 1 Output waveform
4.0V
38.9MHz
Frequency
Note: VCO coil should always be adjusted as above before using
this IC.
18
Share Link: 