LV25400W Sanyo Semicon Device, LV25400W Datasheet - Page 35

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

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No.
Crystal oscillator buffer
output stop switching
TWO_DOFF
Phase comparator control
data
DZ0, DZ1
Charge pump control data
DLC
IC internal signal I/O port
control data
RF tuning D/A converter
output
D31-00 to D31-08
Tuner off setting
D31-09
Antenna tuning D/A
converter output
D31-10 to D31-18
IF AGC amplifier
(narrow/wide) on/off
switching
D31-25
D31-26
Forced AGC (AM/FM)
switching
D31-27
D31-28
IQ mixer gain adjustment
D31-29
AM/FM wide AGC setting
D32-0 to D32-3
Control block/data
• Stops the crystal oscillator buffer output.
1 bit
• Controls the phase comparator's dead zone.
• Forcibly sets the charge pump output to the low level (V SS level).
* : If the IC deadlocks with VCO oscillator stopped with the VCO control voltage (Vtune) at
• Specifies the I/O direction for the I/O ports
* : 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.
1 bit
• 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.
1 bit
• Sets the AM/FM wide AGC sensitivity.
4 bit
DLC = 1 : Low level
DLC = 0 : Normal operation
Data = 0 : Input port. The value 0 should be specified in normal operation.
This item is set to the normal operation state after the power-on reset.
0 V, the deadlock can be resolved by setting the charge pump output to the low level
and setting Vtune to V CC .
The DZA setting is selected after the power-on reset.
DZ1
= 1 : Output port. A value of 1 is used for IC testing.
0
0
1
1
Two-tuner crystal oscillator
buffer switching
Tuner OFF mord
IQ mixer gain adjustment
0
1
0
1
0
1
DZ0
0
1
0
1
LV25400W
Normal operation
Stopped
Normal operation
Tuner-OFF
Gain Down
Normal operation
Dead zone mode
DZA
DZB
DZC
DZD
Description
Continued on next page.
Related data
No.A0633-35/42
Datasheet pdf - http://www.DataSheet4U.net/