Pioneer AVIC-X3/XU/EW5 Service Manual page 41

5
- FM/AM Tuner Unit (AVIC-X3/XU/EW5)
AM ANT
FMRF
1
AT T
FM ANT
3
AT T
FMRF
RF adj
ANT adj
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
6 CE2 I chip enable-2
7 NC non connection
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
16 NC non connection
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 AUDIOGND audio ground
23 L ch O L channel output
24 R ch O R channel output
5
6
7 6 13 5 10 9 8
IC 5
IC 3 EEPROM
5V t 3.3V
5.0V
OSC LPF
IC 1
3.3V
MIXER, IF AM P
T51
CF52
IC 4
t
3.3V
3.3V
2 12 15 22 16 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
including an inductor and a resistor is connected with RF ground for
the countermeasure against the hum of power transmission line.
Ground of antenna block
Input of FM antenna 75 ohm Surge absorber
The power supply for analog block. D.C 8.4 V ± 0.3 V
Output of FM/AM signals level
Chip enable for EEPROM "Low" active
Not used
Chip enable for AF•RF "High" active
Clock
Data input
"Low" active
Ground of oscillator block
Power supply for EEPROM pin 13 is connected with a power supply of
micro computer.
Data output
Ground of digital block
Not used
The power supply for digital block. 3.3 V ± 0.2 V
Output of RDS clock(2.5 V)
Output of RDS data(2.5 V)
Output unit "High" active(2.5 V) (RDS_LOCK turns over by the
external transistor . "Low" active)
Output unit "High" active(2.5 V)(RDS_HSLK turns over by the
external transistor. "Low" active)
Ground of audio block
FM stereo "L-ch" signal output or AM audio output
FM stereo "R-ch" signal output or AM audio output
AVIC-N4/XU/UC
6
7
11 14 18 19 20 21
IC 2
2.5V
DET, FM MPX,
RDS DECODER
2.5V
2.5V
(DSP-201M-S00B)
7
8
A
Rch
24
B
Lch
23
C
is necessary.
D
E
F
41
8