Yamaha RX-V461 Service Manual page 30

• Microprocessor ADC select port
IC401: ADC084S021CIMM (DSP P.C.B.)
4-channel, 200 kSPS, 8-bit A/D converter
IN1
IN2
MUX
IN3
IN4
Pin No. Port Name
1 /CS
2 VA
3 GND
4 IN4
5 IN3
6 IN2
7 IN1
8 DIN
9 DOUT
10 SCLK
Key input (A/D), pull-up resistance 10 k-ohms
Ohm [ohm] +1.0 k +1.0 k
V [V] 0.3 0.55
KEY0 (7 pin) SCENE 1 SCENE 2
KEY1 (6 pin) SCENE 3 SCENE 4
IC402, IC403: SN74LV4051APWR (DSP P.C.B.)
8-channel analog multiplexers/demultiplexers
11
A
10
B
9
C
6
INH
8-Bit
SUCCESSIVE
T/H
APPROXIMATION
ADC
GND
CONTROL
LOGIC
Function Name
/SPISEL1 CS for microprocessor
VA +3.3S
DGND Ground of external
IN4 SPI bus COM (IC402)
IN3 SPI bus COM (IC403)
KEY1 Key input 1
KEY0 Key input 0
SPIMO Master output/slave input
SPIMI Master input/slave output
SPISCK SPI clock
+1.5 k +2.2 k +3.3 k
0.86 1.2 1.56
PROGRAM PROGRAM
STRAIGHT
< >
AUDIO
DIRECT INPUT <
SELECT
3
13
14
15
12
1
5
2
4
RX-V461/HTR-6040/DSP-AX461
V A
CS 1
V A 2
GND
ADC084S021
GND 3
IN4 4
IN3 5
SCLK
CS
DIN
DOUT
Detail of Function
+4.7 k +4.7 k +6.8 k
1.91 2.14 2.36
TONE SEARCH
FM/AM
CONTROL MODE
PRESET/ PRESET/
INPUT >
TUNING < TUNING >
COM
Y0
Y1
Y2
Y3
Y4 1 16 V
CC
INH
Y6 2 15
Y2
L
COM
3 14
Y1
Y4
L
Y7 4 13
Y0
L
5
Y5 12
Y3
Y5
L
INH 6 11
A
L
10
GND 7
B
Y6 L
8 9 C
GND
L
L
Y7
H
10 SCLK
DOUT
9
8 DIN
7 IN1
6 IN2
+10.0 k +22.0 k
2.57 2.81
A/B/C/D/E SPEAKERS
MEMORY TUNING
INPUTS ON
CHANNEL
C B A
L L L Y0
L L H Y1
L H L Y2
L H H Y3
H L L Y4
H L H Y5
H H L Y6
H H H Y7
X X X None
43