參數(shù)資料
型號(hào)： LA76075
廠商： Sanyo Electric Co.,Ltd.
英文描述： NTSC Color Television Sets
中文描述： NTSC制式彩電
文件頁(yè)數(shù)： 15/35頁(yè)
文件大?。?/td> 712K
代理商： LA76075
SIF (FM) Block Input Signals and Measurement Conditions
Unless otherwise specified for the items, apply the following conditions.
1.Use the following bus control condition: IF.AGC.DEF = “1.”
2. SW:IF1 = “ON”
3. Apply the input signal to pin 49. Use a carrier frequency of 4.5 MHz.
No. 5845-15/35
LA76075
Item
Symbol
Measurement
Point
Input
Signal
Measurement Procedure
Bus Condition
FM output level
Adjust the DAC FM.LEVEL to bring the 400 Hz
component of the pin 7 FM wave detection output as
close as possible to 474 mVrms. Measure SV1, the
output level (mVrms).
SOADJ
7
90 dBμ,
fm = 400 Hz,
FM = ±25 kHz
FM limiting sensitivity
Determine the input level (dBμ) at which the 400 Hz
component of the pin 7 FM wave detection output is -3
dB relative to SV1.
FM.LEVEL = adjusted
value
SLS
7
fm = 400 Hz,
FM = ±25 kHz
FM f characteristic
(fm = 50 Hz)
Set SW:IF1 to “OFF.” Measure SV2, the output level
(mVrms) for the pin 7 FM wave detection output, and
substitute in the following formula.
SF50 = 20
×
LOG(SV1/SV2) [dB]
FM.LEVEL = adjusted
value
SF50
7
90 dBμ,
fm = 50 Hz,
FM = ±25 kHz
FM f characteristic
(fm = 100 Hz)
Set SW:IF1 to “OFF.” Measure SV3, the output level
(mVrms) for the pin 7 FM wave detection output, and
substitute in the following formula.
SF100K = 20
×
LOG(SV1/SV2) [dB]
FM.LEVEL = adjusted
value
SF100K
7
90 dBμ,
fm = 100 Hz,
FM = ±25 kHz
FM total harmonic
distortion
Determine the total harmonic distortion for the 400-Hz
component of the pin 7 FM wave detection output.
FM.LEVEL = adjusted
value
STHD
7
90 dBμ,
fm = 400 Hz,
FM = ±25 kHz
AM rejection
Measure SV4, the 400 Hz component (mVrms) of the
pin 7 FM wave detection output, and substitute in the
following formula.
SAMR = 20
×
LOG(SV1/SV4) [dB]
FM.LEVEL = adjusted
value
SAMR
7
90 dBμ,
fm = 400 Hz,
AM = 30%
SIF signal-to-noise ratio
Measure SV5, the noise level (mVrms) at pin 7, and
substitute in the following formula.
SSN = 20
×
LOG(SV1/SV5) [dB]
FM.LEVEL = adjusted
value
SSN
7
90 dBμ,
CW
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