LA76850 查看數據表（PDF） - SANYO -> Panasonic

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LA76850

Black & White Television IC

SANYO -> Panasonic 

LA76850

SIF Block (FM block) Input Signals and Test Conditions

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

1. Bus control condition:

IF.AGC.SW = "1", SIF.SYS = "01", DEEM-TC = "0", FM.GAIN = "0", A.MONI.SW = "0", A2.SW = "0"

2. SW:IF1 = "ON", 24pin = 5V

3. Input signals are input to pin 54 and the carrier frequency is 5.5MHz.

Input signal

Symbol

Test point

Input signal

Test method

Bus conditions

FM detection

output voltage

SOADJ

FM limiting

sensitivity

FM detection

output f characteristics

(fm=100kHz)

FM detection output

distortion

SLS

SF

STHD

AM rejection

ratio

SAMR

SIF.S/N

PAL de-emph time

constant

SSN

SPTC

PAL/NT

Difference of voltage

gain

NT de-emph

time constant

SGD

SNTC

2

90dBµ,

Measure the 400 Hz component (SV1: mVrms) of

fm = 400Hz, the FM detection output at pin 2.

FM =

±30kHz

2

fm = 400Hz, Measure the input level (dBµ) at which the 400Hz

FM =

component of the FM detection output at pin 2

±30kHz

becomes -3dB relative to SV1.

90dBµ,

Set SW: IF1 = "OFF".

2

fm = 100kHz Measure (SV2: mVrms) the FM detection output of

FM =

pin 2. Calculate as follows:

±30kHz

SF = 20*LOG (SV1/SV2) [dB]

90dBµ,

Measure the distortion factor of the 400Hz

2

fm = 400Hz, component of the FM detection output at pin 2.

FM =

±30kHz

90dBµ,

Measure the 400Hz component (SV3: mVrms) of

2

fm = 400Hz, the FM detection output at pin 2.

AM = 30%

Assign the measured value to SV3 and

calculate as follows:

SAMR = 20*log (SV1/SV3) [dB]

90dBµ,

Measure the noise level (DIN AUDIO, SV4:

2

CW

mVrms) at pin 2. Calculate as follows:

SSN=20*log(SV1/SV4) [dB]

90dBµ,

Measure the 3.18kHz component (SV5: mVrms) of

fm =

the FM detection output at pin 2 and calculate as

2

3.18KHz

follows:

FM =

SNTC = 20*LOG (SV1/SV5) [dB]

±30KHz

fo = 4.5MHz Measure the 400Hz component (SV6: mVrms) of SIF.SYS = "00"

90dBµ,

the FM detection output at pin 2 and calculate as DEEM-TC = "1"

2

fm = 400Hz follows:

FM.GAIN = "1"

FM =

SNTC = 20*LOG (SV1/SV6) [dB]

±15KHz

fo = 4.5MHz Measure the 2.12kHz component (SV7: mVrms) of SIF.SYS = "00"

90dBµ,

the FM detection output at pin 2 and calculate as DEEM-TC = "1"

2

fm =

follows:

FM.GAIN = "1"

2.12kHz

SNTC = 20*LOG (SV6/SV7) [dB]

FM =

±15kHz

NoA0017-11/31

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