LA7945N 查看數據表（PDF） - SANYO -> Panasonic

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LA7945N

Closed Caption Signal (US specifications) Extraction IC

SANYO -> Panasonic 

LA7945N

Test Conditions

Parameter

Symbol

Test point

Test method

Horizontal pull-in range

fHPULL

Pins 2 and 10

Vary the frequency fH of the input signal and measure the point where

the phase of pins 2 and 10 locks using an oscilloscope.

Horizontal free-running frequency

fHFREE Pin 10

Use a frequency counter to measure the frequency when there is no

signal.

Input clamping voltage

H LOCK filter threshold level

VCLMP Pin 17

VLOCKTH Pin 7

Measure the pedestal level with an oscilloscope.

Measure the voltage at which pin 7 goes high by applying a DC

voltage to pin 8 and varying that voltage.

High level

Synchronization separation output

Low level

H LOCK filter

High level

Low level

Data output

High level

Low level

Clock output

High level

Low level

High level

21H output

Low level

Pulse width

High level

O/E output

Low level

Pulse width

High level

Horizontal pulse output

Low level

Pulse width

High level

Vertical pulse output

Low level

Pulse width

Input signal level

VSYNCH

VSYNCL

VLOCKH

VLOCKL

VDATAH

VDATAL

VCLKH

VCLKL

V21HH

V21HL

V21HW

VOEH

VOEL

VOEW

VHSH

VHSL

VHSW

VRSTH

VRSTL

VRSTW

VIN

Pin 2*1

Pin 7*1

Pin 3*1, 2

Pin 5*1, 2

Pin 1*1

Pin 6*1

Pin 10*1

Pin 9*1

Each of pins 1,

3, 5, and 6*2

Measure the pin 2 high and low levels with an oscilloscope.

Measure the pin 7 high and low levels with an oscilloscope.

Measure the pin 3 high and low levels with an oscilloscope.

Measure the pin 5 high and low levels with an oscilloscope.

Measure the pin 1 high and low levels and the length of the high level

period with an oscilloscope.

Measure the pin 6 high and low levels and the length of the high level

period with an oscilloscope.

Measure the pin 10 high and low levels and the length of the high level

period with an oscilloscope.

Measure the pin 9 high and low levels and the length of the high level

period with an oscilloscope.

Vary the signal level input to pin 17, and confirm that the pin 1, 3, 5,

and 6 outputs are operating correctly.

CLK-RUN-IN start time

TST

Each of pins 1, Vary the time between SYNC and CLK-RUN-IN, and confirm that the

3, 5, and 6*2, 3 pin 1, 3, 5, and 6 outputs are operating correctly.

Current drain

ICC

Pin 16*2

Connect a current meter to pin 16, and measure the current during

decoding.

Note : 1. Connect a 20kΩ resistor between the pin being measured and VCC, and also connect a 20kΩ from that measurement pin to GND.

2. During measurement, this pin carries the closed caption encoded signal.

3. Time TST is shown in the figure below.

No.4616–3/9

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