LA7642N Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LA7642N

SECAM Format Color TV Chrominance Circuit

SANYO -> Panasonic 

Continued from preceding page.

Parameter

Bell filter frequency characteristics

4.086 MHz

Bell filter frequency characteristics

4.486 MHz

EQU frequency characteristics

4.086 MHz

EQU frequency characteristics

4.486 MHz

Bell filter frequency deviation from

center frequency

Bell filter gain difference at f0 ±500 kHz

[Chrominance Block]

Killer operating point

B-Y output amplitude

R-Y output amplitude

R-Y/B-Y output ratio

B-Y linearity

LA7642N

Symbol

Conditions

Referenced to 4.286 MHz. For reference only.

EQU = off.

Input a 20 mV p-p, f = 4.286 MHz CW signal

to pin 14 and, measure the pin 16 output

BEL4.086 (f = 4.286 MHz). Next, input a CW of

20 mV p-p, f = 4.086 MHz and measure the

pin 16 output (f = 4.086 MHz) and calculate

the frequency characteristics.

Referenced to 4.286 MHz. For reference only.

EQU = off.

Input a 20 mV p-p, f = 4.286 MHz CW signal

to pin 14 and, measure the pin 16 output

BEL4.486 (f = 4.286 MHz). Next, input a CW of

20 mV p-p, f = 4.486 MHz and measure the

pin 16 output (f = 4.486 MHz) and calculate

the frequency characteristics.

Referenced to 4.286 MHz. For reference only.

EQU = on.

Input a 20 mV p-p, f = 4.286 MHz CW signal

to pin 14 and, measure the pin 16 output

EQU4.086 (f = 4.286 MHz). Next, input a CW of

20 mV p-p, f = 4.086 MHz and measure the

pin 16 output (f = 4.086 MHz) and calculate

the frequency characteristics.

Referenced to 4.286 MHz. For reference only.

EQU = on.

Input a 20 mV p-p, f = 4.286 MHz CW signal

to pin 14 and measure the pin 16 output

EQU4.486 (f = 4.286 MHz). Next, input a CW of

20 mV p-p, f = 4.486 MHz and measure the

pin 16 output (f = 4.486 MHz) and calculate

the frequency characteristics.

BELF0

Referenced to 4.35 MHz. For reference only.

EQU = off.

Input a 20 mV p-p CW signal to pin 14 and

modify the frequency of that signal. Measure

the deviation from 4.35 MHz of the frequency

(the center frequency) for which the pin 16

output is maximized.

BELdG

Referenced to 4.35 MHz. For reference only.

EQU = off.

Measure the gain at the BELF0 ±500 kHz,

and calculate the difference.

min

–9

–5

–10.5

–3

–50

–1

Ratings

typ

–6

–2

–7.5

0

0

0

Unit

max

–3

dB

–0.5

dB

–4.5

dB

+3

dB

+50 kHz

+1

dB

Let 0 dB = 200 mV p-p. Input a color bar

signal to pin 14 and gradually lower the input

KILL signal level. Measure the input level at the

–42

point the pin 13 DC voltage falls below 1/2*

VCC.

The pin 7 B-Y amplitude for a color bar signal.

Let 0 dB = 200 mV p-p. Input a color bar

VBY signal (0 dB) to pin 14, and measure the B-Y

0.60

amplitude at pin 7.

The pin 6 R-Y amplitude for a color bar signal.

Let 0 dB = 200 mV p-p. Input a color bar

VRY signal (0 dB) to pin 14, and measure the R-Y

0.74

amplitude at pin 6.

VRY/VBY. Calculate the ratio of the values

RATRB measured above.

1.1

RATRB = VRY/VBY

Input a color bar signal (0 dB) to pin 14. In the

pin 7 (B-Y) output waveform measure the

amplitude of the blue (+230 kHz) and yellow

(–230 kHz) components (A) and measure the

LINBY amplitude of the blue green (+78 kHz) and

85

red (–78 kHz) components (B). Calculate the

value of LINBY from the following formula.

LINBY = (A/B) × (156/460) × 100 (%)

–36

–33

dB

0.75

0.90 Vp-p

0.92

1.10 Vp-p

1.23

1.35

100

115

%

Continued on next page.

No. 5693-2/6

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