Akai MPK Road 88

1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
D D
C C B B
A A
Check REV
Description
Title:
Size
A2
Number
Revision
Date :
File Name:
Sheet of Design By :
DATEDesignApproval
ADC&CODECS&DAC
Fc=125.3kHz G = 2 Fc=125.3kHz G = 2
R56 5.76K 1%
R57 12.7k 1% R51 12.7k 1%
1000pF
C19
AGND
AGND
MASTER VOL
MASTER VOL
MC33079
+
12
-
13
14
U6D
MC33079
+
3
-
2
1
U6A
MC33079
411
U6E
R71 5.76K 1%
R72 12.7k 1% R69 12.7k 1%
1000pF
C30
AGND
R62 2KΩ 1%
R59 2KΩ 1%
R74 2KΩ 1%
R73 2KΩ 1%
R63 0Ω R75 0Ω
AGND AGND
Fc=125.3kHz G = 2 Fc=125.3kHz G = 2
R94 5.76K 1%
R95 12.7k 1%
1000pF
C37
AGND
MC33079
411
U10E
MC33079
+
12
-
13
14
U10D
MC33079
+
3
-
2
1
U10A
MC33079
+
5
-
6
7
U10B
R104 5.76K 1%
R105 12.7k 1%
1000pF
C42
AGND
R96 2KΩ 1%
R93 2KΩ 1%
R106 2KΩ 1%
R103 2KΩ 1%
R97 0Ω R107 0Ω
AGND AGND
MC33079
+
10
-
9
8
U10C
84
+V
-V
U9C NJM4556AM
AGND AGND
MC33079
+
10
-
9
8
U6C
-4VA
MC33079
+
5
-
6
7
U6B
+4VA
C18 100pF
C17 100pF C27 100pF
C28 100pF
C34 100pF
C35 100pF
C40 100pF
C41 100pF
0.1uF C43
0.1uF
C44
0.1uF
C46
0.1uF
C47
0.1uF
C48 0.1uF C45
G = 2 Fc=117.9kHz
+
3
-
2
1
U9A
NJM4556AM
+
5
-
6
7
U9B
NJM4556AM
470pF
C32 470pF C33
AGND AGND
R76 2.87K
R81 2.87K
R80 2.87K
R79 2.87K
R88 2.87K
R89 2.87K
AGND
MUTE
R77 33 ohm R82 33 ohm
AGND AGNDAGND
EC16 470uF,16V
EC17 470uF,16V
2SD2704 Q10
2SD2704
Q9
R84 220Ω
R85 220Ω
R86
47.5KΩ
R87 47.5KΩ
SDIN
1
DEM/SCLK
2
LRCK
3
MCLK
4
8 9
VQ
5
FILT+
6
AOUTL
7
AOUTR
10
VA
GND
U7
AL2-75-4344
CODEC1_LRCK CODEC1_BCLK
CODEC1_MCLK
CODEC1_DOUT
C240.1uF
C250.1uF
+
EC1022uF,16V
+
EC1122uF,16V
C220.1uF
+
EC722uF,16V
R53 0Ω
R54 0Ω_DNS
AGND
A+3.3V +4VA
AGND
SDIN
1
DEM/SCLK
2
LRCK
3
MCLK
4
8 9
VQ
5
FILT+
6
AOUTL
7
AOUTR
10
VA
GND
U11
AL2-75-4344
C380.1uF
C390.1uF
+
EC2122uF,16V
+
EC2222uF,16V
C360.1uF
+
EC1922uF,16V
R90 0Ω
R91 0Ω_DNS
AGND
A+3.3V +4VA
AGND
CODEC2_LRCK CODEC2_BCLK
CODEC2_MCLK
CODEC2_DOUT
+
EC15 22uF,16V
+
EC12 22uF,16V
+
EC20 22uF,16V
+
EC18
22uF,16V
+
EC24 22uF,16V
+
EC23 22uF,16V
+
EC9 22uF,16V
+
EC4 22uF,16V
R65 100Ω R66 100Ω R67 100Ω R68 100Ω
R98 100Ω R99 100Ω R100 100Ω R101 100Ω
+4 V
-4VA
VIN
1
GND
2
ON/OFF
3
BYPASS
4
VOUT
5
U5
LP2985-4.0
EC5
10uF,16V
OUT
1
IN
2
CFLY-
3
GND
4
CFLY+
5
U8 TPS60403
C29 2.2uF
C23 2.2uF C26 2.2uF
+4VA
-4VA
100uF, 10V
EC6
+
EC8
100uF/16V
+
EC13
100uF/16V
AGND AGND
AN_POWER_EN
R60 10K
DMP3099 L
DS
G
Q7
Q8
R55 0Ω
R52 2.2Ω
0.1uF
C20
0.01uF
C21R61
1KΩ
R58 100KΩ
DGND
Analog Power enable control, from MCU
C31 10uF
R50 0Ω(DNS)
R64 1KΩ
R70 2.2Ω
+
EC14 100uF/16V
+5V
AGND
2
1 3
10KA VR3A
5
4 6
10KA VR3B
AGND
HP OUTPUT1_L HP OUTPUT1_R
㕘⡆
TE682000302
暞ẞ⹓
, SMD TYPE 3PIN
炻㓦伖㕤
bottom
Sustain
MUTE_CONTROL
POWER DETECT
EXPRESSION 1 EXPRESSION 2
A+3.3V
D+3.3V
MIDI_OUT
MIDI_IN
+4VA
-4VA
DGNDAGND
OUTPUT1_L OUTPUT1_R OUTPUT2_L OUTPUT2_R
OUTPUT1_L OUTPUT2_L
J15 40p
ὅ㒂䳬墅⿏冯䈡⿏炻婳㓦伖ᶳⰌ
OUTPUT2_R OUTPUT1_R
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
J15
1 2 3
J9
R140 1.5K R141 1.5K
AGND AGND
R78
2.87K_DNS
R83
2.87K_DNS
R92 12.7k 1% R102 12.7k 1%
MUTE