LV25450PNW Datasheet, PDF (33/40 Pages) Sanyo Semicon Device – For Automotive Applications DSP Tuner Front End

LV25450PNW
Continued from preceding page.
No.
Control block/data
(11) Crystal oscillator oscillation
level
adjustment data
XLVL0 to XLVL2
Description
• Data used to adjust the crystal 4.5MHz oscillation level when the S/N condition is
worsening.
X’tal OSC oscillation level adjustment
000
001
010
011
100
101
110
111
Low
↓
↓
↓
↓
↓
↓
High
Related data
R0 to R3,
X_SW_0 to
X_SW_2
(12) Crystal oscillator
ACL circuit
ON/OFF switching
ALC_OFF
• Switches on and off the ALC (Auto level control) in the crystal oscillation circuit. Normally
set to high.
ALC_ON/OFF
switching
0
ALC_OFF
1
Normal operation (ALC_ON)
(13) DO pin control data
ULD
• Determines the DO pin output.
DO pin control data
ULD
DO pin
0
Low when not locked.
1
Open
* In such a case that the DO pin is multiplexed with EEPROM, transmit a setting data that
opens the LV25450PNW DO pin control just before reading out the EEPROM data.
The following item (14) must also be set when monitoring the unlock detection signal.
UL0, UL1
(14) Unlock state detection data • Selects the phase error (øE) detection width used to judge the PLL locked state.
ULD
If a phase error in excess of the øE detection width from the table below occurs, the
UL0, UL1
PLL is seen as being in the unlocked state.
When the PLL is seen as being unlocked, the detection pin (DO) is set low.
UL1
UL0
φE detection width
Detection pin output
0
0
Stopped
Open
0
1
0
φE is output directly
1
0
±0.5μs
φE is delayed by 1 to 2 ms.
1
1
±1μs
φE is delayed by 1 to 2 ms.
(15) Crystal oscillator buffer
output stop switching
TWO_DOFF
φE
Delay
DO
1 to 2ms
Unlock state output
• Stops the crystal oscillator buffer output.
1 bit
Crystal oscillator
buffer switching
0
Normal operation
1
Stopped
(16) Phase comparator control • Controls the phase comparator's dead zone.
data
DZ1
DZ0
Dead zone mode
DZ0, DZ1
0
0
DZA
0
1
DZB
1
0
DZC
1
1
DZD
The DZA setting is selected after the power-on reset.
Continued on next page.
No.A1668-33/40