Denon AVR-1804 Service Manual page 14

Pin
Pin Name
No.
28 XOUT
29 XIN
30 DVDD
31 DGND
32 EMPHA/UO
33 AUDIO/VO
34 CKST
35 INT
36 RERR
37 DO
38 DI
39 CE
40 CL
41 XMODE
42 DGND
43 DVDD
44 TMCK/PIO0
45 TBCK/PIO1
46 TLRCK/PIO2
47 TDATA/PIO3
48 TXO/PIOEN
* For latch-up countermeasure, perform each power supply ON/OFF in the same timing.
LC72131 (IC401)
1 20 XOUT
XIN
CE 2
19 Vss
DI 3 18 AOUT
CL 4 17 AIN
DO 16 PD
5
BO1
VDD
6 15
BO2 FMIN
7 14
BO3 AMIN
8 13
BO4 IO2
9 12
IO1 IFIN
10 11
I/O
O X'tal osc. connecting output terminal
I X'tal osc. connection, external clock input terminal (24.576MHz or 12.288MHz)
— Digital power
— Digital GND
I/O Emphasis information/U-data output/Chip address setting terminal
I/O Non-PCM detect/V-flag output/ Chip address setting terminal
I/O Clock switch transition period output/Demodulation master or slave function switching terminal
I/O Interrupt output for com (Interrupt factor selectable)/Modulation or general I/O switching terminal
O PLL lock error, data error flag output
O com I/F, read out data output terminal (3-state)
I com I/F, write data input terminal
5
I com I/F, chip enable input terminal
5
I com I/F, clock input terminal
5
I System reset input terminal
5
— Digital GND
— Digital power
I/O 256fs system clock input for modulation/General I/O in/output terminal
I/O 64fs bit clock input for modulation/General I/O in/output terminal
I/O fs clock input for modulation/General I/O in/output terminal
I/O Serial audio data input for modulation/General I/O in/output terminal
O/I Modulation data output/ General I/O enable input terminal
LA1266 (IC402)
1 24
12 13
LA3401 (IC403)
22
VOL
REG
SYMMETRICAL
REOCTANCE
CIRCUIT
MUTING
FM AM CHANGE
2
1
AVR-1804/884 / AVC-1880
Function
AM-IF
11
20 18 13
IF
BUFFER
BUFFER
AM-IN 21 RF MIX
REG OSC
22 23
21 20 19 18 16
17
PHASE
OSC PILOT DET
COMPARATOR
VCO STOP
FF FF
FF
FF FF
38kHz 38kHz 90°
19kHz 90°
MUTING CONTROL
DECODER
FM AM CHANGE OVER
Ro Rb
Rc Rb
Rc
4
3 5 6
7
14
FM-IF FM-IN
10 1 2 3 5 6 7
Vcc
IF
FM - IF Q.D.
AM-IF DET
OSC NARROW
AGC S-METER
BUFFER S-METER
GND
24 17
4 14 19
15 14 12
13
LAMP
DRIVER
TRIGGER
STEREO
SWITCH
MUTING
OUTPUT
Vcc ON
MUTING
8 9
10 11
14
POST
12
AMP
9
15
LED
8
DRIVER
16