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LV25400W_0712 Datasheet(PDF) 33 Page - Sanyo Semicon Device

Part No. LV25400W_0712
Description  For Automotive Applications DSP Tuner Front End
Download  42 Pages
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Maker  SANYO [Sanyo Semicon Device]
Homepage  http://www.ssdc-jp.com/eng/
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LV25400W_0712 Datasheet(HTML) 33 Page - Sanyo Semicon Device

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LV25400W
No.A0633-33/42
Continued from preceding page.
No.
Control block/data
Description
Related data
(8)
PLL filter switching mode
MODE
• Switches the PLL filter
PLL filter switching
Filter state
MODE
AM/FM
AM filter
FM filter
0
OFF
ON
Normal
0
1
ON
OFF
0
W-FILTER
1
1
ON
ON
Normal mode (MODE = 0)
The filter state is switched in conjunction with the AM/FM bit.
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.
AM/FM
(9)
IC internal signals
I/O ports
Control data
• 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.
(10)
Crystal oscillator fine
adjustment
X_SW_0
X_SW_1
X_SW_2
• Adjusts the crystal 4.5 MHz reference frequency if beating occurs
X’tal OSC ADJ [When a 4.5MHz oscillator element is used]
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Xtal (Center value)
+150Hz
XS0, XS1
R0 to R3
Continued on next page.
C7
0.033
µF
C10A
1
µF
C11A
0.033
µF
C11B
2200pF
C12
2.2k
1k
CP1
VDD
PIN23
+8V
PIN58
div
5k
3k
SW2
C11
1.3k
D5
SVC704
C4
3pF
C3
2pF
L5
SW3
SW1
FM OSC
R7
30k
C4
330pF
3
4
5
6
8
7
9
10
11


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