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APPLICATION
5.5 Example of I
2
DELAY ADJ
This adjusts the RF AGC delay point. The output level of tuner decreases when the value
increase, the output level increases when the value decreases.
POS/NEG
This switch sets the VIF output signal to either the positive or the negative modulation signal.
When "0," the negative modulation signal is selected; when "1," the positive modulation signal is
selected.
VCO ADJ
This register changes the free running frequency of VIF VCO. The frequency increases when the
value increases, the frequency decreases when the value decreases.
A MUTE
This is the audio mute ON/OFF.
4.5/6.0
This bit must be set to "1" when the sound carrier frequency is 4.5 MHz. Set "0" when the
frequency is other values.
DFA, DL TIME
In order to adjust the color signal and the luminance signal is delayed using the on-chip delay-line.
The DL TIME register adjusts the delay approximately, and the DFA register performes the fine
adjustments. When DFA is "1," actual delay time is +50 ns; when "0," it is +0 ns. For relationship
between DFA and DL TIME, refer to "Table 5.5.9."
DBF
The M52340SP has 2 TRAP; the second TRAP extends the bandwidth of the TRAP, described
below. DBF is the ON/OFF switch for the second TRAP. When "1," it is on; when "0," it is off. DBF
is used in SECAM and other methods.
TRAP
This is the TRAP ON/OFF switch for taking out the luminance signal (Y-signal) by Y/C separation
(Y = Y-signal, C = color signal) of the composite video signal. When "1," it is on; when "0," it is
off.
AUDIO ATT
Data is set ("0" to "127") to change the volume.
5-42
C-BUS control by software (M37220M3-XXXSP/FP)
7220 Group User's Manual
Table 5.5.9 Relationship between DFA and DL TIME
Data
DL
DL
TIME0
TIME1
0
0
1
0
2
0
3
0
4
1
5
1
6
1
7
1
DFA
Actual
delay time
0
0
170 ns
0
1
120 ns
1
0
330 ns
1
1
280 ns
0
0
410 ns
0
1
360 ns
1
0
490 ns
1
1
440 ns
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