IS31AP4913 Stereo Headphone Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. –
www.issi.com
R1.1, 3/7/2012
2
Performance Description*
The IS31AP4913 evaluation board has six buttons to switch between the different modes. The operating mode is
indicated by an LED illuminated above the appropriate buttons. The (1~4) modes are performed by IS31AP4913.
1. (Default mode) normal: basic operating mode
2. 3D mode: enable 3D enhance function.
3. Bass mode: enable bass enhance function.
4. 3D&Bass: enable 3D and bass enhance function.
5. 2111: use the output DC-blocking capacitors headphone amplifier (HWD2111) drive headphone
6. DIR: use the input audio source direct drive headphone.
*Note: IS31AP4913 headphone driver provides solely audio function capability on the evaluation board .
Software Support
Please refer to the integrated program.
*Note: Please refer to the datasheet to get more information about IS31AP4913
Figure 2: IS31AP4913 Application Circuit
J8
AUDIO IN
VDD_5V
C20
0.47uF
R12
30k
R10
4.7k
C19
47nF
R11
100k
R13
510k
C22
22nF
R15
20k
C17
0.47uF
R9
30k
R7
20K
C15
22nF
R8
510k
C14
0.1uF
GND
C12
1uF
J7
HP Jack
C18
2.2uF
C16
2.2uF
C21
2.2uF
R23
20k
R6
20k
VDD_5V
VDD
1
GND
2
SD
3
BP
4
VOUT
5
U3
LDO
C9
10nF
C8
0.1uF
VCC_3V
C10
10uF
SW4
3D&Bass
SW3
Bass
SW2
3D
SW1
NORMAL
R17
10k
R18
10k
R19
10k
R20
10k
VCC_3V
ke
y
5
ke
y
2
ke
y
3
ke
y
4
1
2
3
4
5
P1
ICP
GND
RST
VCC_3V
P2.0/ICB/DAC0/AD03
1
P2.1/OCD/AD02
2
P0.0/CMP2/KBI0/AD01
3
P1.7/OCC/AD00
4
P1.6/OCB
5
P1.5/RST
6
VSS
7
P3.1/XTAL1
8
P3.0XTAL2/CLKOUT
9
P1.4/INT1
10
P1.3/INT0/SDA
11
P1.2/T0/SCL
12
P2.2/MOSI
13
P2.3/MISO
14
P2.4/SS
15
P2.5/SPICLK
16
P1.1/RXD
17
P1.0/TXD
18
P0.7/T1/KBI7
19
P0.6/CMP1/KBI6
20
VDD
21
P0.5/CMPREF/KBI5
22
P0.4/CIN1A/KBI4/DAC1/AD13
23
P0.3/CIN1B/KBI3/AD12
24
P0.2/CIN2A/KBI2/AD11
25
P0.1/CIN2B/KBI1/AD10
26
P2.6/OCA
27
P2.7/ICA
28
U1
LPC936
C11
0.1uF
VCC_3V
EN4913
key1
key2
key3
key4
LED1
LED2
LED3
LED4
D4
D3
D2
D1
R14
1k
LED1
LED2
LED3
LED4
VCC_3V
VDD_5V
C2
10uF
EN4913
GND
BASER
20
INFR
1
INR
2
3DR
3
3DL
4
BASSL
6
INFL
7
NC
8
NC
9
INL
5
S
GND
10
CTRL
11
VDD
12
VREF
13
CP
16
P
GND
17
OUTR
14
PVSS
18
OUTL
15
CN
19
U4
IS31AP4913
VOUT1
1
VIN1
2
BYPASS
3
CLOCK
4
GND
5
UP/DN
6
SDB
7
VIN2
8
VOUT2
9
VDD
10
U2
2111
VDD_5V
C4
0.47uF
C5
0.47uF
EN2111
EN2111
CLK2111
DATA2111
DATA2111
CLK2111
C7
0.47uF
INL
INL
INR
INR
OUTL
OUTR
OUTL
OUTR
1
2
J1
VCC
1
2
J3
GND
1
2
J4
INL
1
2
J5
INR
1
2
J9
OUTL
1
2
J10
OUTR
1
2
J11
GND
1
2
J6
GND
VDD_5V
INL
INR
OUTL
OUTR
C1
1uF
J2
DC CON
R5
120k
R22
120k
LED5
SW5
2111
R16
10k
D5
LED5
R1 0R
R2 0R
C3
22uF
C6
22uF
ke
y
6
R3
100k
C13
6.8pF
C23
6.8pF
GND
10
VCC
1
CON1
2
COM1
3
COFF1
4
NC
5
NC
6
COFF2
7
COM2
8
CON2
9
S1
RELAY
3
1
2
Q1
TRANSISTOR_NPN_3904
VDD_5V
R4
1k
INL
INR
OUTL
OUTR
SW6
DIR
R21
10k
ke
y
1
LED6
D6
EN_DIR
EN_DIR
LED6
key5
key6
EN2111
DATA2111
RST
