LV25400W_10 Datasheet, PDF (35/42 Pages) Sanyo Semicon Device – For Automotive Applications DSP Tuner Front End

LV25400W
Continued from preceding page.
No.
Control block/data
(17) Crystal oscillator buffer
output stop switching
TWO_DOFF
Description
• Stops the crystal oscillator buffer output.
1 bit
Two-tuner crystal oscillator
buffer switching
0
Normal operation
1
Stopped
(18) 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.
(19) Charge pump control data • Forcibly sets the charge pump output to the low level (VSS level).
DLC
DLC = 1 : Low level
DLC = 0 : Normal operation
* : If the IC deadlocks with VCO oscillator stopped with the VCO control voltage (Vtune) at
0 V, the deadlock can be resolved by setting the charge pump output to the low level
and setting Vtune to VCC.
This item is set to the normal operation state after the power-on reset.
(20) IC internal signal I/O port
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.
(21) RF tuning D/A converter
output
D31-00 to D31-08
(22) Tuner off setting
* : This data must be set to 0 at all times other than IC evaluation.
• Applies a control voltage to the RF tuning circuit (varactor).
9 bit
• Set the IC to tuner off mode.
D31-09
(23) Antenna tuning D/A
converter output
D31-10 to D31-18
(24) IF AGC amplifier
(narrow/wide) on/off
switching
D31-25
D31-26
(25) Forced AGC (AM/FM)
switching
D31-27
D31-28
(26) IQ mixer gain adjustment
1 bit
Tuner OFF mord
0
Normal operation
1
Tuner-OFF
• Applies a control voltage to the antenna tuning circuit (varactor).
9 bit
• Operates the IF AGC amplifier circuit (narrow/wide).
D31-25 : wide-10.7MHz 0 = ON , 1 = OFF
D31-26 : narrow-10.7MHz 0 = ON , 1 = OFF
Each 1 bit
• Operates the forced AGC circuit (narrow/wide).
D31-27:FM AGC 0 = NORMAL, 1 = ON
D31-28:AM AGC 0 = NORMAL, 1 = ON
Each 1 bit
• Switches the FM IQ mixer gain.
D31-29
(27)
1 bit
IQ mixer gain adjustment
0
Gain Down
1
Normal operation
Related data
(28) AM/FM wide AGC setting • Sets the AM/FM wide AGC sensitivity.
D32-0 to D32-3
4 bit
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