LA76850 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LA76850

Black & White Television IC

SANYO -> Panasonic 

LA76850

Audio Block Input Signals and Test Conditions

Unless otherwise specified, the following conditions apply when each measurement is made.

1. Bus control condition:

AUDIO.MUTE = "0", A.MONI.SW = "0", AUDIO.SW = "1", VOL.FIL = "0", SIF.SYS = "01", IF.AGC.SW = "1"

2. Input 5.5MHz, 90dBµ and CW at pin 54.

3. Enter an input signal from pin 51.

Input signal

Symbol

Test point

Input signal

Test method

Bus conditions

Maximum gain

Variable range

Frequency

characteristics

Mute

Distortion

S/N

Crosstalk

AGMAX

ARANGE

AF

AMUTE

ATHD

ASN

ACT

1kHz, CW

Measure the 1kHz component (V1: mVrms) at

VOLUME =

1

500mVrms the pin 1 and calculate as follows:

"1111111"

AGMAX = 20*LOG(V1/500) [dB]

1kHz, CW

Measure the 1kHz component (V2: mVrms) at

VOLUME =

1

500mVrms the pin 1 and calculate as follows:

"0000000"

ARANGE = 20*LOG(V1/V2) [dB]

20kHz, CW Measure the 20kHz component (V3: mVrms) at

VOLUME =

1

500mVrms the pin 1 and calculate as follows:

"1111111"

AF = 20*Log(V3/V1) [dB]

20kHz, CW Measure the 20kHz component (V4: mVrms) at

VOLUME =

1

500mVrms the pin 1 and calculate as follows:

"1111111"

AMUTE = 20*Log(V3/V4) [dB]

AUDIO.MUTE = ”1”

1

1kHz, CW

Measure the distortion of the 1kHz component at VOLUME =

500mVrms the pin 1.

"1111111"

No signal

Measure the noise level (DIN AUDIO, V5: mVrms) VOLUME =

1

at the pin 1 and calculate as follows:

"1111111"

ASN = 20*log(V1/V5) [dB]

1kHz, CW

Measure the 1kHz component (V6: mVrms) at

VOLUME =

1

500mVrms the pin 1 and calculate as follows:

"1111111"

ACT = 20*LOG(V1/V6) [dB]

AUDIO.SW = "0"

NoA0017-12/31

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