LA76070 View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LA76070

NTSC Color Television IC

SANYO -> Panasonic 

LA76070

Video Switch Block - Input Signals and Measurement Conditions

1. Unless otherwise indicated, these measurements are to be performed with no signal applied to PIF IN (pin 10) and

with the D/A converter IF.ACG.SW set to "1".

2. The table below lists the input signals and their labels.

Input signal

Waveform

Condition

SG8

10-step staircase waveform

1 V p-p

SG9

4.2 MHz

1 Vp-p

Parameter

[VIF Block]

External video gain

External video sync signal tip

voltage

External video crosstalk

Internal video output level

Symbol

Measurement

point

Input signal

Measurement procedure

Bus conditions

AUXG

AUXS

AUXC

INT0

Observe pin 42 with an oscilloscope, measure

42

Pin 1

SG8

the peak-to-peak value of the waveform, and

perform the following calculation.

VIDEO.SW = "1"

AUXG = 20 × log (Vp-p) [dB]

Observe pin 42 with an oscilloscope and

measure the synchronizing signal tip voltage

42

Pin 1

SG8

in the waveform.

Determine the voltage difference between this VIDEO.SW = "1"

measured value and synchronizing signal tip

level (VOtip) measured in the VIF block.

Measure the 4.2 MHz component in the pin 42

signal with a spectrum analyzer.Convert this

42

Pin 1

SG8

measurement to a V peak-to-peak value and

perform the following calculation.

VIDEO.SW = "0"

AUXG = 20 × log (1.4/Vp-p) [dB]

Pin 10

Observe pin 45 with an oscilloscope and

measure the peak-to-peak value of the

42

SG7

waveform. Determine the difference between

(VIF block)

93 dBµ

this measured value and the video output

amplitude (VO) measured in the VIF block.

After performing the adjustments

described in section 4

IF. AGC. SW = "0"

VIDEO. SW = "0"

No. 5844-12/27

Share Link: