LA76075 Ver la hoja de datos (PDF) - SANYO -> Panasonic
Número de pieza
componentes Descripción
Fabricante
LA76075 Datasheet PDF : 35 Pages
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LA76075
Item
[VIF Block]
AFT output voltage with
no signal
Video output voltage with
no signal
Symbol
VAFTn
VOn
Measurement Input
Point
Signal
Measurement Procedure
Bus Condition
13
No
signal
Set IF.AGC.DEF to “1” and measure the DC voltage at pin 13.
See Section 4 for the
adjustment value.
45
No
signal
Set IF.AGC.DEF to “1” and measure the DC voltage at pin 45.
See Section 4 for the
adjustment value.
APC pull-in range (U), (L) fPU, fPL
Connect an oscilloscope to pin 45, apply a frequency higher
than 45.75 MHz to SG4, and unlock the phase-locked loop to
produce beats. Gradually lower the frequency until the PLL
45
SG4 locks and calculate the difference with 45.75 MHz. Repeat the See Section 4 for the
93 dBµ procedure from the opposite direction, lowering the frequency adjustment value.
until the PLL unlocks, raising it, and then calculating the
difference between the frequency at which the PLL locks and
45.75 MHz.
Maximum RF AGC
voltage
VRFH
6
SG1 Set the RF AGC DAC to 0 and measure the DC voltage at pin See Section 4 for the
91 dBµ 6.
adjustment value.
Minimum RF AGC
voltage
VRFL
6
SG1 Set the RF AGC DAC to 63 and measure the DC voltage at See Section 4 for the
91 dBµ pin 6.
adjustment value.
RF AGC Delay Pt
(@DAC = 0)
RFAGC0
6
SG1
Set the RF AGC DAC to 0 and note the point at which the DC See Section 4 for the
voltage at pin 6 is closest to 3.8 V.
adjustment value.
RF AGC Delay Pt
(@DAC = 63)
RFAGC63
6
SG1
Set the RF AGC DAC to 63 and note the point at which the See Section 4 for the
DC voltage at pin 6 is closest to 3.8 V.
adjustment value.
Maximum AFT output
voltage
VAFTH
13
SG4 Apply a 44.75MHz signal to SG4 0 and measure the DC See Section 4 for the
93 dBµ voltage at pin 13.
adjustment value.
Minimum AFT output
voltage
VAFTL
13
SG4 Apply a 46.75MHz signal to SG4 0 and measure the DC See Section 4 for the
93 dBµ voltage at pin 13.
adjustment value.
AFT sensitivity
VAFTS
13
SG4
93 dBµ
Vary the SG4 frequency and determine the frequency
differential ∆f required to change the DC voltage at pin 13
from 2.5 V to 5.0 V. VAFTS = 2500/∆f [mV/kHz]
See Section 4 for the
adjustment value.
Video output level
VO
45
SG6 Connect an oscilloscope to pin 45 and measure the peak-to- See Section 4 for the
93 dBµ peak amplitude.
adjustment value.
Sync tip level
VOtip
45
SG1
93 dBµ
Measure the DC voltage at pin 45.
See Section 4 for the
adjustment value.
Input sensitivity
Vi
45
SG6
Connect an oscilloscope to pin 45 and measure the peak-to-
peak amplitude. Gradually lower the input level and note the
level at which the video output amplitude (VO) is –3 dB.
See Section 4 for the
adjustment value.
Video/sync ratio
V/S
45
SG6
93 dBµ
Connect an oscilloscope to pin 45, measure the peak-to-peak
amplitudes of the SYNC waveform (Vs) and the brightness
signal (Vy), and determine the ratio Vy/Vs.
See Section 4 for the
adjustment value.
Differential gain
DG
45
SG5
93 dBµ
Measure the pin 45 output with a vectorscope.
See Section 4 for the
adjustment value.
Differential phase
DP
45
SG5
93 dBµ
Measure the pin 45 output with a vectorscope.
See Section 4 for the
adjustment value.
Video signal-to-noise
ratio
S/N
Pass the pin 45 noise output through a band pass filter
45
SG1 covering 10 kHz to 4 MHz, measure the level (Vsn) with an See Section 4 for the
93 dBµ RMS voltmeter, and substitute in the following formula.
adjustment value.
S/N = 20 log (1.43/Vsn)
920-kHz beat level
Apply a 93dBµ signal to SG1 and measure the DC voltage
I920
45
SG1
SG2
SG3
(V12) at pin 12. Mix the following signals and apply them to
VIF IN: SG1 = 87 dBµ, SG2 = 82 dBµ, and SG3 = 62 dBµ. See Section 4 for the
Apply the V12 level from an external power supply to pin 12. adjustment value.
Measure the difference between the 3.58MHz and 920kHz
components form pin 45 with a spectrum analyzer.
No. 5845-14/35
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