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5
- FM/AM Tuner Unit (UC)
AM ANT
FMRF
1
ATT
FM ANT
3
ATT
FMRF
RF adj
ANT adj
No. Symbol
I/O Explain
1 AMANT
I
AM antenna input
2 RFGND
RF ground
g
MANT
I
FM antenna input
4
power supply
5 SL
O signal level
g
6 CE2
I
chip enable-2
7
non connection
8
I
chip enable-1
clock
10 DI
I
data in
11 NC
non connection
osc ground
g
13 ROM_VDD
power supply
14 DO
O data out
15 DGND
digital ground
g
non connection
power supply
18 NC
non connection
19 NC
non connection
20
non connection
non connection
audio ground
23 L ch
O L channel output
24 R ch
O R channel output
5
6
7 6
13
5
IC 3 EEPROM
5.0 V
OSC
LPF
IC 1
3.3 V
MIXER, IF AMP
T51
CF52
3.3 V
2
1
6
4
17
AM antenna input high impedance AMANT pin is connected with
an all antenna by way of 4.7 µH. (LAU type inductor)A series circuit
the countermeasure against the hum of power transmission line.
Ground of antenna block
Input of FM antenna 75 Ω Surge absorber
Chip enable for EEPROM "Low" active
Not used
Chip enable for AF•RF "High
Clock
Data input
Not used
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
Not used
The power supply for digital block. 3.3 V
Not used
Not used
Not used
Not used
g
FM stereo "L-ch" signal output or AM audio output
FM stereo "R-ch" signal output or AM audio output
AVIC-D3/XU/UC
6
7
10 9 8
11
14
18 19 20 21
IC 5
5 V 3.3 V
DET, FM MPX
4
3.3 V
2.5 V
2.5 V
g
g
g " active
g
g
g
7
8
Rch
24
IC 2
2.5 V
Lch
23
is necessary.
± 0.3 V
± 0.2 V
8
A
B
C
D
E
F
291
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