Fm/Am Tuner Unit - Pioneer DEH-P880PRS Service Manual

1

- FM/AM Tuner Unit

A
AM ANT
1
FM ANT
3
B
ATT
ATT
No. Symbol I/O Explain
C
1 AMANT
2 RFGND
3 FMANT
4 VCC
5 SL O
6 CE2
7 WC
8 CE1
D
9 CK
10 DI
11 LDET O lock detector
12 OSCGND
13 ROM_VDD
14 DO O
15 DGND
16 COMP O
17 VDD_3.3
18 RDS_CK O RDS clock
19 RDS_DATA O RDS data
E
20 RDS_LOCK O
21 RDS_HSLK O
22 ANT1
23 L ch O L channel output
24 R ch O R channel output
F
102
1
2
7 6 13
VCO
TANK RF TANK
RF LPF
2 12 15 4
I AM antenna input 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.
RF ground g Ground of antenna block
Input of FM antenna 75 Ω Surge absorber is necessary.
I FM antenna input
power supply
signal level g Output of FM/AM signals level
I chip enable-2 Chip enable for EEPROM "Low" active
I write control Y Y
I chip enable-1 Chip enable for AF•RF "
I clock Clock data input
I data in Data input
"
osc ground g Ground of oscillator block
power supply Power supply for EEPROM pin 13 is connected with a power supply of
micro computer.
data out Data output
digital ground g g Ground of digital block
composite output FM composite signal output.
power supply The power supply for digital block. 3.3 V
Output of RDS clock(2.5 V)
RDS lock Output unit "High"
external transistor. "Low" active)
RDS high speed Output unit "High"
lock
diversity antenna
control
FM stereo "L-ch" signal output or AM audio output
FM stereo "R-ch" signal output or AM audio output
DEH-P880PRS/XN/UC
2
3
5 10 9 8 11 14 18 19 20 21
IC4 IC3
5 V 3.3 V EEPROM
LPF
IC1
MIX/IF/PLL
IFT CF X-tal
17
g
g
" active
g
g
g
" " active)
3
IC2
DET/NC/MPC/MPX/DIV/RDS
REG OSC
g
± 0.3 V
"Low".
" active
± 0.2 V
"High" : MAIN, "Low"=SUB
4
COMP
16
Rch
24
Lch
23
ANT1
22
4