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5
- FM/AM Tuner Unit
AM ANT
1
FM ANT
3
ATT
TANK
ATT
No. Symbol
I/O Explain
1 AMANT
I
AM antenna input
2 RFGND
RF ground
3 FMANT
I
FM antenna input
4 VCC
power supply
5 SL
O
signal level
g
6 CE2
I
chip enable-2
7 WC
I
write control
8 CE1
I
chip enable-1
9 CK
I
clock
10 DI
I
data in
11 LDET
O lock detector
12 OSCGND
osc ground
13 ROM_VDD
power supply
14 DO
O
data out
15 DGND
digital ground
g
16 COMP
O
composite output
17 VDD_3.3
power supply
18 RDS_CK
O RDS clock
19 RDS_DATA O RDS data
20 RDS_LOCK
O
RDS lock
21 RDS_HSLK
O
RDS high speed
lock
22 ANT1
diversity antenna
control
23 L ch
O L channel output
24 R ch
O R channel output
5
6
7
6
13
5
VCO
RF
TANK
IC1
MIX/IF/PLL
RF
LPF
IFT
2
12
15
4
17
AM antenna input high impedance AMANT pin is connected with
an all antenna by way of 33 µH. (LAU type inductor) A series circuit
including an inductor and a resistor is connected with RF ground for
the countermeasure against the hum of power transmission line.
g
Ground of antenna block
Input of FM antenna 75 Ω Surge absorber is necessary.
Output of FM/AM signals level
Chip enable for EEPROM "Low" active
Y Y
Chip enable for AF•RF "
Clock data input
Data input
"
" active
g
Ground of oscillator block
Power supply for EEPROM pin 13 is connected with a power supply of
micro computer.
Data output
g
Ground of digital block
FM composite signal output.
The power supply for digital block. 3.3 V
Output of RDS clock(2.5 V)
Output unit "High"
external transistor. "Low" active)
Output unit "High"
FM stereo "L-ch" signal output or AM audio output
FM stereo "R-ch" signal output or AM audio output
AVH-P7800DVD/UC
6
7
10
9
8
11
14
18 19 20 21
IC4
IC3
5 V
3.3 V
EEPROM
LPF
IC2
DET/NC/MPC/MPX/DIV/RDS
CF
X-tal
g
g
g
" active
g
g
g
"
" active)
7
8
COMP
16
Rch
24
Lch
23
ANT1
22
REG
OSC
± 0.3 V
"Low".
± 02 V
"High" : MAIN, "Low"=SUB
8
A
B
C
D
E
F
269
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