ISSI IS31AP4913 User Manual

IS31AP4913 Stereo Headphone Driver Evaluation Board Guide

Description

The IS31AP4913 evaluation board is a fully assembled
and tested PCB. The IS31AP4913 is a high quality
stereo headphone driver with 3D-surround and bass
enhancement capability. It also features removal of the
output DC-blocking capacitors for a reduction in
system component count and end cost. 3D-surround
and bass-enhancement are controlled via RC network.

Features

Supply voltage range from 2.7V to 5.5V



Low output noise (8µV)



High SNR (102dB)



-92dB PSRR



No output DC-blocking capacitors



Pulse Count Control serial interface



Available in QFN-20(3mm × 3mm) package



Quick start

Figure 1 Photo of IS31AP4913 Evaluation Board

Recommended Equipment

5.0V, 2A power supply



Audio source (i.e. MP3 player, Notebook PC, etc.)



Headphone (32Ω)



Absolute Maximum Ratings

≤ 5.5V power supply



Caution: Do not exceed the conditions listed above; otherwise, the
board risks permanent damage.

Procedure

The evaluation board allows verification of
IS31AP4913 device operation.

Caution: Do not turn on the power supply until all connections are
completed.

1. Connect headphone (32Ω) to the connector
(headphone input jack).

2. Connect the ground terminal of the power supply
to the GND and the positive terminal to the VCC.

3. Alternatively, connect DC power to connector (DC
IN).

4. Connect the audio sources to the INR terminal
(right channel) and INL terminal (left channel); or
connect audio source directly to connector
(AUDIO- IN).

5. Turn on the power supply, and pay attention to the
supply current. Be cautious: currents above
200mA are large enough to cause board damage.

6. Turn on the audio source.

Ordering Information

Part No. Temperature Range IC Package

IS31AP4913-QFLS2-EB

For pricing, delivery, and ordering information, please conta ct ISSI at

[e-mail]

Integrated Silicon Solution, Inc. – www.issi.com

R1.1, 3/7/2012 1

or [phone]

-40°C to +85°C (Industrial)

Table 1. Ordering Information

QFN-20, Lead-free

IS31AP4913 Stereo Headphone Driver Evaluation Board Guide

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

VDD_5V

J1

2

VDD_5V

R16
10k

key1

SW1
NORMAL

J2

DC CON

C8

0.1uF

J4

INL

J9

OUTL

VDD_5V

C2
10uF

U3

1

VDD

VOUT

3

SD

2

GND

BP

LDO

VDD_5V

1

VCC

2

CON1

3

COM1

4

COFF1

5

NC

INL INR

2
1

OUTL OUTR

2
1

R17

R18

10k

10k

key2

key3

SW3

SW2

Bass

3D

RELAY

1

VCC

J3

2
1

GND

VCC_3V

5

C9

C10

10nF

10uF

4

S1

10

GND

9

CON2

8

COM2

7

COFF2

6

NC

J5

2
1

INR

J10

2
1

OUTR

VCC_3V

R19

R20

10k

10k

key5

key4

SW4

SW5

3D&Bass

2111

key6

INLINR
OUTLOUTR

R21
10k

SW6
DIR

312

P1

ICP

R4

EN_DIR

1k

TRANSISTOR_NPN_3904

Q1

J6

2
1

GND

J11

2
1

GND

VCC_3V

5

EN2111

4

DATA2111

3

RST

2

GND

1

GND

VCC_3V

R14
1k

D1

LED1

D2

LED2

D3

LED3

D4

LED4

D5

LED5

D6

LED6

EN_DIR
LED3
EN4913
CLK2111
DATA2111
EN2111
key 2
key 1

LED1
LED2
key 3
key 4
key 5
RST
LED5
LED4

3
26
25
24
23
22
20
19

18
17
12
11
10

6

5

4

J8

AUDIO IN

U1

P0.0/CMP2/K BI0/AD01
P0.1/CIN2B/KBI1/AD10
P0.2/CIN2A/KBI2/AD11
P0.3/CIN1B/KBI3/AD12
P0.4/CIN 1A/KBI4/DAC1/AD 13
P0.5/CMPREF/KBI5
P0.6/CMP1/KBI6
P0.7/T1/KBI7

P1.0/TXD
P1.1/RXD
P1.2/T0/SCL
P1.3/INT0/SDA
P1.4/INT1
P1.5/RST
P1.6/OCB
P1.7/OCC/AD00

LPC936

INL

INR

C17

0.47uF

C20

0.47uF

Figure 2: IS31AP4913 Application Circuit

P2.0/ICB/DAC0/AD03

P2.1/OCD/AD02

P2.2/MOSI
P2.3/MISO

P2.4/SS

P2.5/SPICLK

P2.6/OCA
P2.7/ICA

P3.0XTAL2/CLKOUT

P3.1/XTAL1

R5
120k

C13

6.8pF

R9
30k

R10

C19 47nF
R11
100k

R12
30k

R22

C23

120k

6.8pF

VDD

VSS

C15
22nFR8510k

4.7k

EN4913

C22
22nF

1
2
13
14
15
16
27
28

9
8

21

7

VCC_3V

R6
20k

R7
20K

R13
510k

R15
20k

R23
20k

C4 0.47uF

INL
INR

C5 0.47uF

DATA2111

CLK2111
key 6
LED6

C11

0.1uF

7

INFL

6

BASSL

5

INL

3

3DR

4

3DL

11

CTRL

2

INR

20

BASER

1

INFR

EN2111

VDD_5V

C12

C14

U4

12

VDD

SGND

PGND

IS31AP4913

10

17

VDD_5V

1uF

C1

10

U2

2

VOUT1

VIN1

VDD

VIN28VOUT2

6

UP/DN

4

CLOCK

7

BYPA SS

SDB

R3
100k

GND

GND

2111

5

1uF

0.1uF

15

OUTL

16

CP

C16

2.2uF

19

CN

18

PVSS

C18

2.2uF

8

NC

9

NC

13

VREF

C21

2.2uF

14

OUTR

C3

C6

J7

HP Jack

OUTL

22uF

OUTR

22uF

1

R1

0R

9

R2

0R

3

C7

0.47uF

OUTL

OUTR

Integrated Silicon Solution, Inc. – www.issi.com

R1.1, 3/7/2012 2