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參數(shù)資料
| 型號： | LA7615 |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP64 |
| 封裝： | SDIP-64 |
| 文件頁數(shù)： | 10/39頁 |
| 文件大?。?/td> | 206K |
| 代理商： | LA7615 |
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First SIF Block - Input Signals and Test Conditions
For each of the test items, set up the following conditions unless otherwise specified.
1.
PIF.IN: 45.75 MHz, 93 dB, CW
2.
Bus control conditions: Set the following 4 items to their adjusted values.
(See the VIF block test description for details on the adjustment procedure.)
APC DET.ADJ
PLL tuning
4.5 MHz trap
Video level
3.
Apply the input signal to the pin 12, using a signal with a frequency of 41.25 MHz CW.
SIF Block - Input Signals and Test Conditions
For each of the test items, set up the following conditions unless otherwise specified.
1.
Connect pin 13 (SIF AGC) to ground.
2.
Bus control conditions: IF.AGC.SW = 1.
3.
SW:IF1 = off
4.
Apply the input signal to pin 61. The carrier frequency should be 4.5 MHz.
No. 5841-18/39
LA7615
Parameter
Symbol
Test point
Input signal
Test procedure
Bus condition
4.5 MHz conversion gain
4.5 MHz output level
First SIF maximum input
SCG
SVO
SVM
60 dB
88 dB
96 dB
Measure the pin 59 output 4.5 MHz component (mV
rms). Let SV1 be this measured value and perform
the following calculation.
SCG = 20 × log(SV1 × 1000) – 60 [dB]
Measure the pin 59 output 4.5 MHz component (mV
rms). Let SV2 be this measured value and perform
the following calculation.
SCO = 20 × log(SV2 × 1000) [dB]
Measure the pin 59 output 4.5 MHz component (mV
rms). Let SV3 be this measured value and perform
the following calculation.
SCM = 20 × log(SV3/SV1) [dB]
59
Parameter
Symbol
Test point
Input signal
Test procedure
Bus condition
FM detector output voltage
FM limiting sensitivity
FM detector output bandwidth
FM detector output distortion
AM rejection ratio
SIF signal-to-noise ratio
SOADJ
SLS
SF
STHD
SAMR
SSN
90 dB,
fm = 1 kHz,
FM = ±25 kHz
fm = 1 kHz,
FM = ±25 kHz
90 dB,
FM ±25 kHz
90 dB,
fm = 1 kHz,
FM ±25 kHz
90 dB,
fm = 1 kHz,
AM = 30%
90 dB, CW
Adjust the D/A converter (FM.LEVEL) so that the pin
5 FM detector output 1 kHz component is as close to
424 mV rms as possible. Measure the output (mV
rms) at that time.
Let SV1 be the measured value at this time.
Determine the input level (dB) such that the pin 5
FM detector output 1 kHz component is down –3 dB
from SV1.
Determine the modulation frequency bandwidth (Hz)
for a –3 dB drop in the pin 5 FM detector output
1 kHz component with respect to SV1.
Determine the distortion in the pin 5 FM detector
output 1 kHz component.
Measure (in mV rms) the pin 5 FM detector output
1 kHz component.
Let SV2 be the measured value at this time and
perform the following calculation.
SAMR = 20 × log(SV1/SV2) [dB]
Set the SW:IF1 switch to the on state.
Measure the noise level (mV rms) on pin 5.
Let SV3 be the measured value at this time and
perform the following calculation.
SSN = 20 × log(SV1/SV3) [dB]
FM.LEVEL =
adjusted value.
FM.LEVEL =
adjusted value.
FM.LEVEL =
adjusted value.
FM.LEVEL =
adjusted value.
FM.LEVEL =
adjusted value.
5
59
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