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參數資料
| 型號： | LA76810HA |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP54 |
| 封裝： | 0.600 INCH, DIP-54 |
| 文件頁數： | 3/41頁 |
| 文件大小： | 417K |
| 代理商： | LA76810HA |
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LA76810HA
No.A1143-11/41
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"
2. SW:IF1 = "ON"
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
2
90dB
,
fm = 400Hz,
FM =
±30kHz
Adjust the DAC (FM.LEVEL) such that the 400Hz
component of the FM detection output at pin 2
become as close to 600mVrms as possible and
measure (SV1:mVrms) the output at that
moment.
FM limiting
sensitivity
SLS
2
fm = 400Hz,
FM =
±30kHz
Measure the input level (dB
) at which the 400Hz
component of the FM detection output at pin 2
becomes -3dB relative to SV1.
FM level =
Adjustment value
FM detection
output f characteristics
(fm = 100kHz)
SF
2
90dB
,
fm = 100kHz
FM =
±30kHz
Set SW: IF1 = "OFF".
Measure (SV2: mVrms) the FM detection output
of pin 2. Calculate as follows:
SF = 20*LOG (SV1/SV2) [dB]
FM level =
Adjustment value
FM detection output
distortion
STHD
2
90dB
,
fm = 400Hz,
FM =
±30kHz
Measure the distortion factor of the 400Hz
component of the FM detection output at pin 2.
FM level =
Adjustment value
AM rejection
ratio
SAMR
2
90dB
,
fm = 400Hz,
AM = 30%
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 = 20*LOG (SV1/SV3) [dB]
FM level =
Adjustment value
SIF.S/N
SSN
2
90dB
,
CW
Measure the noise level (DIN AUDIO, SV4:
mVrms) at pin 2. Calculate as follows:
SSN=20*LOG(SV1/SV4) [dB]
FM level =
Adjustment value
PAL de-emph time
constant
SPTC
2
90dB
,
fm = 3.18KHz
FM =
±30KHz
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]
FM level =
Adjustment value
PAL/NT
Difference of voltage
gain
SGD
2
fo = 4.5MHz
90dB
,
fm = 400Hz
FM =
±15KHz
Measure the 400Hz component (SV6: mVrms) of
the FM detection output at pin 2 and calculate as
follows:
SNTC = 20*LOG (SV1/SV6) [dB]
FM level =
Adjustment value
SIF.SYS = "00"
DEEM-TC = "1"
FM.GAIN = "1"
NT de-emph
time constant
SNTC
2
fo = 4.5MHz
90dB
,
fm = 2.12kHz
FM =
±15kHz
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]
FM level =
Adjustment value
SIF.SYS = "00"
DEEM-TC = "1"
FM.GAIN = "1"
BPF 3db band width
SBW
2
90dB
,
CW
Set SW: IF1 = "OFF".
Pin9 = 5V
Measure the 458kHz component (SV8: mVrms)
at pin 2. Set the input frequency to 5.565MHz to
the input frequency and measure the 393kHz
component (SV9: mVrms) at pin 2 to calculate as
follows:
SBW = 20*LOG (SV8/SV9) [dB]
FM level=
Adjustment value
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