LV25400W Sanyo Semicon Device, LV25400W Datasheet - Page 33

• Manufacturer Part Number: LV25400W
• Description: DSP Tuner Front End
• Manufacturer: Sanyo Semicon Device

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Continued from preceding page.
(10)
No.
(8)
(9)
PLL filter switching mode
MODE
IC internal signals
I/O ports
Control data
Crystal oscillator fine
adjustment
X_SW_0
X_SW_1
X_SW_2
Control block/data
• Switches the PLL filter
Normal mode (MODE = 0)
The filter state is switched in conjunction with the AM/FM bit.
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.)
• Specifies the I/O direction for the I/O ports
* : This data must be set to 0 at all times other than IC evaluation.
• Adjusts the crystal 4.5 MHz reference frequency if beating occurs
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.
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.
Data = 0 : Input port. The value 0 should be specified in normal operation.
Normally set to 0.
L5
PLL filter switching
X’tal OSC ADJ [When a 4.5MHz oscillator element is used]
3
W-FILTER
FM OSC
330pF
Filter state
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
= 1 : Output port. A value of 1 is used for IC testing.
C3
2pF
C4
Normal
div
4
SW3
D5
SVC704
C4
3pF
30kΩ
R7
Xtal (Center value)
↓
↓
↓
↓
↓
↓
+150Hz
MODE
5
LV25400W
SW1
0
1
PIN58
+8V
6
0.033µF
3kΩ
AM/FM
C7
0
1
0
1
SW2
Description
7
5kΩ
AM filter
8
OFF
ON
ON
9
1.3kΩ
C10A
1µF
C11
FM filter
10
OFF
ON
ON
PIN23
V DD
CP1
2.2kΩ
C12
1kΩ
11
C11A
0.033µF
C11B
2200pF
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AM/FM
XS0, XS1
R0 to R3
Related data
No.A0633-33/42
Datasheet pdf - http://www.DataSheet4U.net/