LV24100LP Datasheet, PDF (16/18 Pages) Sanyo Semicon Device – Bi-CMOS IC FM and AM Tuner IC for Small Portable Equipment

LV24100LP
Block 3, Register 03h-AM_FE-AM Front End Register(Write-only)
7
6
5
4
3
2
AGC_LVL
AGC_GAIN
Bit 7-5:
Bit 4:
Bit 3-2:
Bit 1-0:
AGC_LVL[2:0]: AGC level bits
AAGC_EG: AM AGC extra gain
AAGC_GAIN[1:0]: AM AGC gain setting
AMCAP[9:8]: Upper bits of AM antenna capacitor bank
1
AMCAP9
0
AMCAP8
Block 3, Register 04h-AM_CTRL-AM Control Register(Write-only)
7
6
5
4
3
2
1
0
AMFE_AT
AABSW
nFIFAGC
AMFE_EN
AM_CAL
nAMEMG
FE_SPD[1:0]
Bit 7:
AMFE_AT: AM front end attenuator
0 = Disable AM front end attenuator
1 = Enable AM front end attenuator
Note: This bit is don’t care for FM and should be 1 for AM
Bit 6:
AABSW: AM antenna band switch
0 = Switch off AM antenna band
1 = Switch on AM antenna band
Bit 5:
nFIFAGC: Fast IF AGC(active low)
0 = Fast IF AGC speed
1 = Norma lF AGC speed
Note: This bit must be 0 for FM.
In AM mode, this bit must be 1 and can be changed to 0 during scanning for AM stations to speed up the scan operation.
Bit 4:
AMFE_EN: Enable AM front end bit
0 = Disable AM front end
1 = Enable AM front end
Bit 3:
AM_CAL: AM calibration bit
0 = Disable AM calibration(normal operation)
1 = Enable AM calibration(calibrate AM antenna frequency mode)
Note: This bit must be set to 1 before measuring the AM antenna frequency
Bit 2:
nAMEMG: Extra gain AM mixer bit
0 = Extra mixer gain(normal operation)
1 = No extra mixer gain
Bit 1-0:
FE_SPD[1:0]: AM front end speed bits
No.A0194-16/18