LV25300M Sanyo Semicon Device, LV25300M Datasheet - Page 3

• Manufacturer Part Number: LV25300M
• Description: 1-chip Tuner IC
• Manufacturer: Sanyo Semicon Device

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Bus control circuit
Connection to CDSP300 (interface)
Block Diagram
circuit
COIL
LPF
tuner
Switching control
• AM/FM reception switching
• AM/FM RF AGC sensitivity setting: 4 bits
• FM keyed AGC control: 4 bits
• AM/FM RF tuning DAC (9 bits × 2)
• AM/FM SD control ON/OFF
• AM/FM IF counter output control ON/OFF
• AM oscillator 1 divider setting
• SEEK/receive mode switching
• AM/FM IF output (450kHz)
• AM/FM S-meter output, AC/DC 2 systems
• AM-NC gate trigger output
FM RF AMP circuit
FM ANT tuner circuit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Diversity block
FE
PLL
FM RF tuner circuit
ANT selector
COUNTER
21
80
Time constant
MAIN FIX
NMOS Tr
CURRENT
CIRCUIT
swallow
generator
Keyed
counter
P-CTR
charge
DRIVER
AGC
phase
pump
ANT-D
det
79
22
RF
OSC
N AGC
AM RF AMP circuit
78
IF COUNTER
23
AM ANT circuit
NOIZE AMP
1/8, 1/10
1/4, 1/6
6/8bit AD
converter
Automatic adjustment
R-CTR
DIVIDER
BPF
ECL
LOGIC
AGC
77
MIX
FM
24
1st
W
Lo/DX
FM
76
25
COIL
RF
MIX
BUS-
POWER ON
MIX
AM
1st
AGC
W
75
RESET
26
IN 3-1
IN 3-2
IN 3-3
IN 3-4
IN 1
IN 2
BUS
74
27
CF 10.7MHz
ANT-D
M AGC
3V REG
73
28
Lo/DX
DAC block
AM
72
29
LV25300M
Diversity
CIRCUIT
XTAL 10.25MHz
DAC
71
30
• FM ANT tuning circuit fc control
• FM RF tuning circuit fc control
• AM/FM IF gain adjustment
• FM/AM W-AGC sensitivity adjustment
• FM/AM N-AGC sensitivity adjustment
• FM S-meter shift
• AM/FM SD sensitivity setting
• NULL adjustment
• AFC band width
• Noise amplifier, noise, and AGC circuits
• Noise density coefficient circuit
• Antenna selection output
• Generating a signal for the antenna switching frequency
• Weak electric field detection and antenna positioning
XTAL
OSC
4.9V REG
and positioning antenna
70
31
32
69
33
68
FM IF
AM block
CF 10.7MHz
1stAMP
1stAMP
AM detector
low cut
AFC
67
AM
AMP
FM
34
450kHz
OUTPUT_BUFFER
S-METER
66
35
SD
450kHz
CIRCUIT
DETECTET
AUDIO
2.7V REG
NC STOP
36
65
S-METER
(DC/AC)
AM TRANS
2ndIFAMP
SD
64
37
AM-NC
CIRCUIT
MUTE
Differential
IF AGC
NOIZE
AMP
AMP2
38
63
DETECTER
NOIZE
Differential
62
TRIG
2ndMIX
39
2ndMIX
AGC
Limiter
AMP1
AMP
AM
CF 10.7MHz
40
61
60
57
54
53
50
48
47
46
45
44
42
41
59
58
56
55
52
51
49
43
No.8320-3/4
CF 450kHz
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