Pioneer DEH-P680MP/XN/UC Service Manual page 74

1
- FM/AM Tuner Unit
A
AM ANT
FMRF
1 ATT
FM ANT
3
ATT
FMRF
B
ANT adj
No. Symbol I/O Explain
C
1 AMANT
2 RFGND
3 FMANT
4 VCC
5 SL O signal level
6 CE2
7 NC
8 CE1
9 CK
D
10 DI
11 NC
12 OSCGND
13 ROM_VDD
14 DO O data out
15 DGND
16 NC
17 VDD_3.3
18 NC
19 NC
E 20 NC
21 NC
22 AUDIOGND
23 L ch O L channel output
24 R ch O R channel output
F
74
1
2
7 6
IC 3 EEPROM
5.0V
OSC
IC 1
3.3V
MIXER, IF AMP
RF adj
T51
2 12 15 22 16
I AM antenna input AM antenna input high impedance AMANT pin is connected with
an all antenna by way of 4.7µH. (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.
RF ground Ground of antenna block
I FM antenna input Input of FM antenna 75Ω Surge absorber
The power supply for analog block. D.C 8.4V ± 0.3V
power supply
Output of FM/AM signals level
I chip enable-2 Chip enable for EEPROM "Low" active
non connection Not used
I chip enable-1 Chip enable for AF•RF "High" active
I clock Clock
I data in Data input
non connection Not used
osc ground Ground of oscillator block
power supply Power supply for EEPROM pin 13 is connected with a power supply of
micro computer.
Data output
digital ground Ground of digital block
non connection Not used
The power supply for digital block. 3.3V ± 0.2V
power supply
non connection Not used
non connection Not used
non connection Not used
non connection Not used
audio ground Ground of audio block
FM stereo "L-ch" signal output or AM audio output
FM stereo "R-ch" signal output or AM audio output
DEH-P680MP/XN/UC
2
3
13 5 10 9 8 11 14 18 19 20 21
IC 5
5V 3.3V
LPF
CF52
IC 4
3.3V 2.5V
2.5V
3.3V
4 17
3
4
Rch
24
IC 2
2.5V
Lch
23
DET, FM MPX
(DSP-201M-S00B) is necessary.
4