LV25400W_0712 Datasheet, PDF (33/42 Pages) Sanyo Semicon Device – For Automotive Applications DSP Tuner Front End

Continued from preceding page.
No.
Control block/data
(8) PLL filter switching mode
MODE
LV25400W
Description
• Switches the PLL filter
PLL filter switching
Filter state MODE AM/FM
AM filter
0
Normal
0
1
OFF
ON
0
W-FILTER
1
ON
1
Normal mode (MODE = 0)
The filter state is switched in conjunction with the AM/FM bit.
FM filter
ON
OFF
ON
Related data
AM/FM
FM mode (AM/FM = 0)
A filter is formed on pins 8 and 11.
Since this filter can be independent of the filter used in AM mode, PLL locking can be
fast.
AM mode (AM/FM = 1)
A filter is formed on pins 9 and 10 and with the two internal switches SW1 and SW2.
An additional filter is added using an internal resistor and an external capacitor.
W-filter mode (MODE = 1)
Both filters are enabled, regardless of the AM/FM bit.
(All of pins 8, 9, 10, and 11, and switches SW1 and SW2 are used.)
This is used when sidebands occur in AM mode, and in other cases.
However, there are case where, depending on the particular filter component values,
this mode cannot be used.
+8V
PIN58
3kΩ
SW2 5kΩ
div
VDD
PIN23
CP1
1kΩ
SW3
FM OSC
SW1
3
4
5
6
7
8
9
10
11
C3
C4
2pF
3pF
C4
330pF
L5
R7
30kΩ
D5
SVC704
C7
0.033µF
C10A
1µF
C11A
0.033µF
C11
C12
1.3kΩ 2.2kΩ
C11B
2200pF
(9) IC internal signals
I/O ports
Control data
(10) Crystal oscillator fine
adjustment
X_SW_0
X_SW_1
X_SW_2
• Specifies the I/O direction for the I/O ports
Data = 0 : Input port. The value 0 should be specified in normal operation.
= 1 : Output port. A value of 1 is used for IC testing.
* : This data must be set to 0 at all times other than IC evaluation.
Normally set to 0.
• Adjusts the crystal 4.5 MHz reference frequency if beating occurs
X’tal OSC ADJ [When a 4.5MHz oscillator element is used]
000
001
010
011
100
101
110
111
Xtal (Center value)
↓
↓
↓
↓
↓
↓
+150Hz
XS0, XS1
R0 to R3
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No.A0633-33/42