LA76832N データシートの表示（PDF） - SANYO -> Panasonic

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LA76832N

I2C Bus Control IC

SANYO -> Panasonic 

LA76832N

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 = ”00”, DEEM-TC = ”1”, FM.GAIN = ”1”

2. SW : IF1 = “ON”

3. Input signals are input to pin 54 and the carrier frequency is 4.5MHz.

Parameter

FM detection

output voltage

FM limiting sensitivity

FM detection output f

characteristics

(fm=100kHz)

FM detection output

distortion

AM rejection ratio

SIF. S/N

NT de-emph time constant

Symbol

SOADJ

SLS

SF

STHD

SAMR

SSN

SNTC

Test

point

2

2

2

2

2

2

2

Input

signal

90dBµ,

fm = 400Hz,

FM = ±25kHz

fm = 400Hz,

FM = ±25kHz

90dBµ,

fm = 100kHz,

FM = ±25kHz

90dBµ,

fm = 400Hz,

FM = ±25kHz

90dBµ,

fm = 400Hz,

AM = 30%

90dBµ,

CW

90dBµ,

fm = 2.12kHz,

FM = ±25kHz

Test method

Adjust the DAC (FM. LEVEL) such that the 400

Hz component of the FM detection output at pin

2 become as close to 500 mVrms as possible

and measure (SV1 : mVrms) the output at that

moment.

Measure the input level (dBµ) at which the

400Hz component of the FM detection output at

pin 2 becomes -3dB relative to SV1.

Set SW : IF1 = "OFF".

Measure (SV2 : mVrms) the FM detection output

of pin 2. Calculate as follows :

SF = 20Log (SV1/SV2) [dB]

Measure the distortion factor of the 400Hz

component of the FM detection output at pin 2.

Measure the 1kHz component (SV3 : mVrms) of

the FM detection output at pin 2.

Assign the measured value to SV3 and

calculate as follows :

SAMR = 20Log (SV1/SV3) [dB]

Measure the noise level (DIN AUDIO, SV4 :

mVrms) at pin 2. Calculate as follows :

SSN = 20Log (SV1/SV4) [dB]

Measure the 2.12kHz component (SV5 : mVrms)

of the FM detection output at pin 2 and calculate

as follows :

SNTC = 20Log (SV1/SV5) [dB]

Bus conditions

FM level =

Adjustment value

FM level =

Adjustment value

FM level =

Adjustment value

FM level =

Adjustment value

FM level =

Adjustment value

FM level =

Adjustment value

No.0069-9/39

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