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參數(shù)資料
| 型號(hào)： | LA76850 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Monolithic Linear IC Black & White Television IC |
| 中文描述： | 單片線性集成電路黑色 |
| 文件頁(yè)數(shù)： | 11/31頁(yè) |
| 文件大?。?/td> | 295K |
| 代理商： | LA76850 |
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LA76850
NoA0017-11/31
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
2
Input signal
Test method
Bus conditions
FM detection
output voltage
SOADJ
90dB
μ
,
fm = 400Hz,
FM =
±
30kHz
fm = 400Hz,
FM =
±
30kHz
90dB
μ
,
fm = 100kHz
FM =
±
30kHz
90dB
μ
,
fm = 400Hz,
FM =
±
30kHz
90dB
μ
,
fm = 400Hz,
AM = 30%
Measure the 400 Hz component (SV1: mVrms) of
the FM detection output at pin 2.
FM limiting
sensitivity
SLS
Measure the input level (dB
μ
) 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 = 20*LOG (SV1/SV2) [dB]
Measure the distortion factor of the 400Hz
component of the FM detection output at pin 2.
FM detection
output f characteristics
(fm=100kHz)
SF
FM detection output
distortion
STHD
AM rejection
ratio
SAMR
Measure the 400Hz component (SV3: mVrms) of
the FM detection output at pin 2.
Assign the measured value to SV3 and
calculate as follows:
SAMR = 20*log (SV1/SV3) [dB]
Measure the noise level (DIN AUDIO, SV4:
mVrms) at pin 2. Calculate as follows:
SSN=20*log(SV1/SV4) [dB]
Measure the 3.18kHz component (SV5: mVrms) of
the FM detection output at pin 2 and calculate as
follows:
SNTC = 20*LOG (SV1/SV5) [dB]
SIF.S/N
SSN
90dB
μ
,
CW
PAL de-emph time
constant
SPTC
90dB
μ
,
fm =
3.18KHz
FM =
±
30KHz
fo = 4.5MHz
90dB
μ
,
fm = 400Hz
FM =
±
15KHz
fo = 4.5MHz
90dB
μ
,
fm =
2.12kHz
FM =
±
15kHz
PAL/NT
Difference of voltage
gain
SGD
Measure the 400Hz component (SV6: mVrms) of
the FM detection output at pin 2 and calculate as
follows:
SNTC = 20*LOG (SV1/SV6) [dB]
SIF.SYS = "00"
DEEM-TC = "1"
FM.GAIN = "1"
NT de-emph
time constant
SNTC
Measure the 2.12kHz component (SV7: mVrms) of
the FM detection output at pin 2 and calculate as
follows:
SNTC = 20*LOG (SV6/SV7) [dB]
SIF.SYS = "00"
DEEM-TC = "1"
FM.GAIN = "1"
2
2
2
2
2
2
2
2
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