LA7642N datasheet(2/6 Pages) SANYO

No de pièce	LA7642N

Description	SECAM Format Color TV Chrominance Circuit

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Fabricant	SANYO [Sanyo Semicon Device]

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2 / 6 page

No. 5693-2/6

LA7642N

Parameter

Symbol

Conditions

Ratings

Unit

min

typ

max

Referenced to 4.286 MHz. For reference only.

EQU = off.

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

Bell filter frequency characteristics

BEL4.086

to pin 14 and, measure the pin 16 output

–9

–6

–3

dB

4.086 MHz

(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

Bell filter frequency characteristics

BEL4.486

to pin 14 and, measure the pin 16 output

–5

–2

–0.5

dB

4.486 MHz

(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

EQU frequency characteristics

EQU4.086

to pin 14 and, measure the pin 16 output

–10.5

–7.5

–4.5

dB

4.086 MHz

(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

EQU frequency characteristics

EQU4.486

to pin 14 and measure the pin 16 output

–3

0

+3

dB

4.486 MHz

(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 4.35 MHz. For reference only.

EQU = off.

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

Bell filter frequency deviation from

BELF0

modify the frequency of that signal. Measure

–50

0

+50

kHz

center frequency

the deviation from 4.35 MHz of the frequency

(the center frequency) for which the pin 16

output is maximized.

Referenced to 4.35 MHz. For reference only.

Bell filter gain difference at f0 ±500 kHz

BELdG

EQU = off.

–1

0

+1

dB

Measure the gain at the BELF0 ±500 kHz,

and calculate the difference.

[Chrominance Block]

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

signal to pin 14 and gradually lower the input

Killer operating point

KILL

signal level. Measure the input level at the

–42

–36

–33

dB

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

VCC.

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

B-Y output amplitude

VBY

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

0.60

0.75

0.90

Vp-p

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

amplitude at pin 7.

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

R-Y output amplitude

VRY

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

0.74

0.92

1.10

Vp-p

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

amplitude at pin 6.

VRY/VBY. Calculate the ratio of the values

R-Y/B-Y output ratio

RATRB

measured above.

1.1

1.23

1.35

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

B-Y linearity

LINBY

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

85

100

115

%

amplitude of the blue green (+78 kHz) and

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

value of LINBY from the following formula.

LINBY = (A/B)

× (156/460) × 100 (%)

Continued from preceding page.

Continued on next page.

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