LV25700PM Datasheet, PDF (22/68 Pages) Sanyo Semicon Device – For Car Radio Single chip Tuner IC

FM/AM level Diagram
FM FE
LV25700PM
CF75
CF_10.7M
N
AGC
RF
AGC
Keyed
AGC
VCA
W
AGC
VCA
MIX_OUT2 ⁸⁰
8V
1
T80
R80
IFT_10.7M
30Ω
C80
0.022μF
78
C8
0.22μF
R7
30kΩ
C7
1000pF
C9
1000pF
9 10 11 12 13 14
R10A
100Ω
C10
4pF
C10B
8pF
C11
4pF
VCD1
FM_RF
R11A
100kΩ
T10
FM_RF
C10A
1000pF
R11B
180Ω
FET2
3SK263
R10
30Ω
R8
220kΩ
R11C
100kΩ C11B
1000pF
R9A
30kΩ
C11C
2pF
C57
1000pF
C11A
1000pF
R11D
100kΩ
GND_RF
VCD3
FM_ANT R13
330Ω
C2C
0.022μF
C11D
1000pF
C11E
4pF
L8
FM ANT
D4
1SV251
C13
0.1μF
GND_RF
FM_ANT
RF AGC
• Narrow AGC pick up
MIX OUT(4bit adj)
• Wide AGC pick up
MIX IN (10,11pin)(4bit adj)
• Keyed AGC
Controls narrow and wide AGC (4-bit adjustment)
using the S-meter (Pin 44).
MIX
Image rejection Mixer(4bit adj)
1^st IF (10.7MHz)
FM IF
10.7MHz
75
73
1st IF
70
MIX2
BPF
10.25MHz
level
meter
for
SD/SNC/HCC
/Keyed
for
MRC/NC/ BPF
S-meter
SA13:D7
FIL_VSMON
IF count
D/A
SOFT
CONTROL
D/A
FM/AM
SD
MOD AFC
PLL
U.DET S-meter
DET
57 44
S-meter(sub) S-meter
HPF
SA10:D3 SA12:D7-4
HPF_FC SIG_Q
60 ^{DET OUT}
59
NC IN
55 Q_CONT
64 MUTE_COUNT
• S-meter (10.7MHz)
• 2^nd IF (450kHz)
• BPF (40kHz to 180kHz automatic control)
Detection path
→ S-meter sub/Det out/AFC modulation index
• S-meter for BPF (dedicated to filter adjustment)
• IF count freq (10.7MHz)
• IF Limiter AMP
• Band SD
• Soft Mute
• RDS Decoder
41 RDS_LPF
30 RD_CL
29 RD_DA
No.A1709-22/68