LV25700PM Datasheet, PDF (31/68 Pages) Sanyo Semicon Device – For Car Radio Single chip Tuner IC

Stereo Decoder
LV25700PM
CHCC
60
SEPARATION
60
MPX_IN
60
MAIN
HC
SA47
HCC_SW
from NC
from NC
LPF
SUB
DEC
SA17
SEPD
SEP
Adj
SA26
DEEMPSW
MAT
RIX
50μF
75μF
SW
FF
19k<90
FF
19k<0
FF
38k<90
S-
meter
10kΩ
HCC SNC
SA26
HCC_DAC
SA25
SNC_DAC
SA25
SNC SLOPE
MRC
50kΩ
50kΩ
80kΩ
FF
38k<0
FF
76k<90
FF
44
S-meter
78
49 50
HCC_CONT L_OUT
R_OUT
PHASE
COMP
MPX
VCO
SA18
MPXVCO
DC-
Moni
Phase comp
54
55
Phase comp
DC-Monitor
24
PILOT
DET
PILOT
CANCEL
PILOT_DET
66
SA26
MO_ST_SW
SA24
ST_SENS_ADJ
SA17
PICAN
TO NC
SA:D
SA18
D0-D5
MPV VCO
SA26 D6 Force MONO
SA17
D0-D5
SA24
D3
Separation
Control
ST-Sens ADJ
SA17
D6-D7
SA25
D0-D4
Pi-Can(Pilot Cancel Level
Control)
SNC DAC/AM-RF-AGC
Amp threshold value
(steep slope side)
SA25
D5-D6
SNC slope
SA26
D7
SA26
D0-D4
SA47
D5
De-emphasis
FM/AM
HCC DAC
HCC SW
SA24
D4
VCO ON
Recommended Setting
FM:*
[0]
Process adjustment
required
FM:[0]
FM:[0]
FM:
AM:[0]
FM:*
AM:[12]
FM:[6]
AM:[3]
[0]
Description of Functions
Optimum value: Set so that the free-running frequency (VCO frequency under no-
modulation conditions) is near 304kHz (adjust to within ±2kHz).
* Set VCO ON (SA24: D4) to [1] during adjustment.
0 = Normal: Normal mode, 1 = Force MONO: Forced monaural
Optimum value: Adjust to maximize separation at the standard electric field input.
0 = OFF (normal), 1 = ON (ST ON sensitivity increased)
When set to ON, the ST ON sensitivity (ON/OFF) is increased by approximately
1% compared to when set to OFF.
[Pi-Can]
Typical value: Center (process adjustment optional)
[SNC DAC]
Adjust to the specified separation at medium electric field input.
[AM-RF-AGC]
Optimum value: Fix to [0].
Small bit value: Gentle slope, Large bit value: Steep slope
* If the value is too small, SEP operation may be performed even at weak electric
field input, resulting in a deteriorated ST S/N ratio.
Set according to the destination.
0: 50μsec [JPN], 1: 75μsec [US]
Optimum value: Adjust to the specified frequency characteristics at weak electric
field input.
The HCC frequency characteristics is set by the Pin 51 external capacity value and
the internal resistor (adjustable).
Optimum value: FM mode = [6], AM mode = [3]
FM mode = 6: HCC cutoff fc = 2.2kHz (when C51 = 2,200pF)
AM mode = 3: HCC cutoff fc = 800Hz (when C51 = 2,200pF)
0: Normal mode, 1: MPX-VCO monitor test mode
[Pin 24 frequency measurement]
(In MPX-VCO monitor mode: Set DC SELECT SA09, D5 to D7 to SD/MPX VCO
OUT.)
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