ISSI IS31AP2111 User Manual

IS31AP2111 2×20W STEREO DIGITAL (I2S) AUDIO
AMPLIFIER WITH 20 BANDS EQ FUNCTIONS

DESCRIPTION

The IS31AP2111 is a digital I2S interface audio
amplifier capable of driving a pair of 8 speakers at
20W when operating from a 24V supply. Due to its
Class-D output drive stage, it can operate without an
external heat-sink or fan.

The IS31AP2111 integrates advanced audio
processing capabilities, such as volume control, 20
bands speaker EQ, audio mixing, 3D surround and
Dynamic Range Control (DRC). These functions are
fully programmable via a simple I2C control interface.

Robust protection circuits are provided to protect the
IS31AP2111 from damage due to accidental
erroneous operating conditions. Because of its digital
design, the IS31AP2111 is more tolerant to noise and
PVT (Process, Voltage, and Temperature) variation
than the analog Class-AB or Class-D audio amplifier
counterpart. It has built-in anti-pop circuitry for pop free
operation during power ON.

QUICK START

FEA TURES

 16/18/20/24-bits input with I2S, Left-alignment and

Right-alignment data format

 PSNR & DR (A-weighting)

Loudspeaker: 99dB (PSNR), 104dB (DR) @24V

 Supply voltage

- 3.3V for digital circuit

- 10V~26V for loudspeaker driver

 Loudspeaker output power for at 24V

- 10W × 2CH into 8 @0.24% THD+N for stereo

- 20W × 2CH into 8 @0.38% THD+N for stereo

 Sound processing including:

- 20 bands parametric speaker EQ

- Volume control (+24dB ~ -103dB, 0.125dB/step),

- Dynamic range control (DRC)

- Dual band dynamic range control

- 3D surround sound

- Channel mixing

- Bass/Treble tone control

 Anti-pop design
 Short circuit and over-temperature protection
 I2C control interface with selectable device

address

 Support hardware and software reset
 Power saving mode

ABSOLUTE MAXIMUM RATINGS

  26V power supply
  8 speaker

Caution: Do not exceed the conditions listed above; otherw
ise the board will be damaged.

Figure 1: Photo of IS31AP2111 Evaluation Board

RECOMMENDED EQUIPMENT

 10~26V, 4A power supply
 I2C programmer to set register values
 Pair of 8 20W speakers with RCA plug
 Audio source with 3.5mm mini plug

ORDERING INFORMATION

Part No. Temperature Range Package

IS31AP2111-ZLS1-EB 0°C to +70°C (Industrial) eTSSOP-24,Lead-free

Table 1: Ordering Information

For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at

[e-mail]

or [phone].

Integrated Silicon Solution, Inc. – www.issi.com 1

Rev . A, 12/19/2014

IS31AP2111 2×20W STEREO DIGITAL (I2S) AUDIO
AMPLIFIER WITH 20 BANDS EQ FUNCTIONS

PROCEDURE

The IS31AP2111 demo board is fully assembled and
tested. Follow the steps listed below to verify board
operation.

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

1) Connect the ground terminal of the power supply
to the GND and the positive terminal to the VCC.
Or connect DC power to connector (DC IN).

2) Connect a pair of 8 speakers to the SPK_L
(RCA connector) and SPK_R (RCA connector).

3) Connect an audio source to the audio connector
AUDIO IN (3.5mm stereo connector).

4) Turn on the power supply.

5) IS31AP2111’s default setting is mute. Please
program the following registers via the I2C
interface to disable the mute:

JUMPER AND SWITCH SETTING TABLE

Jumper/Switch
Connector

S1 Enable/disable IS31AP2111

S2 Hardware reset Pressed: reset

JP7 3.3V output

JP1 ERROR status output

JP2

JP3

JP4 GND

JP5

JP6 I2C address setting

SPK_R

SPK_L Left channel output RCA connector Connect to 8ohm 20W speaker

AUDIO IN 3.5mm stereo connector Analog audio input

Options

A/D Converter (U2) I2S data output
( MCLK,DATA,LRCIN,BCLK)

I2S data input (MCLK, DATA, LRCIN,
BCLK)

I2C interface, program interface for
an external I2C controller used for
programming the IS31AP2111
registers.

Right channel output RCA
connector

a) When use A/D converter(U2) I2S data output

for IS31AP2111, the evaluation board must
set the MCLK/FS to 256x and Sampling
Frequency to 32/44.1/48kHZ, write value
(04h) to register 0x01 to set the state.

b) 02h State Control 3 Register: To disable the

Master mute: clear bit D3 To disable the
individual channel mutes: clear D2:D1 bits.

c) 03h Master Volume Control Register: To set

the Master volume write a value to bits D7:D0,
To set the individual channel volumes: write a
value to registers 0x04-0x05.

d) Please refer to the IS31AP2111 datasheet for

register values used in programming features
such as mute, volume, bass/treble tone,
surround sound, equalization, etc.

Setting
(Jumper on “H” for logic 1, on “L” for logic 0)

L(0): shutdown mode
H(1): standby mode

3.3V output, if AMS1117 is not mounted, can
provide 3.3V through this connector

Short circuit is reported on Error pin (JP1-2) as a
low state, and protection is latched ,connect Error
pin (JP1-2) to PDB pin (JP1-1),short circuit
protection latch can auto-recovery

Use a two pin header to connect I2S signal from
JP2 to JP3

Connect I2S signal from JP3 or connect to an
external I2S data source

JP5-1 I2C SCL (Clock)
JP5-2 I2C SDA (Data)
JP5-3 I2C GND

L(0): Set the I2C device address to 0x30 (7bit
address 0110000)
H(1): Set the I2C device address to 0x34(7bit
address0110100)

Connect to 8ohm 20W speaker

DC IN 2.5mm DC Connector 10~26V, 4A power supply

Integrated Silicon Solution, Inc. – www.issi.com 2

Rev . A, 12/19/2014

IS31AP2111 2×20W STEREO DIGITAL (I2S) AUDIO
AMPLIFIER WITH 20 BANDS EQ FUNCTIONS

ASDATA

ALRCIN
ABCLK

3.3V

C15
1uF

3.3V 3.3V

CON 4

AUDIO INPUT

DC IN
CON1

JP7

3.3V

3.3V DVDD

R9 0R

R10 0R

R11 0 R

R33

100K

R3

R1

NC

10K

M0

VL

R2

R8

10K

NC

R34

C50

0.1uF

MCLK
SDATA0

LRCIN
BCLK

PDB

FILT+

REF_ GND

AINR

AINL

C23 1uF

C24 1uF

C37
1nF

JP1

123

ERROR

M1

VA

VQ

JP4

RSTB

1

GND

ERROR

16
15
14
13
12
11
10
9

NC

C59

1uF

1
2
3
4
5
6

3.3V

ADC_INR

ADC_INL

ADC_INL

ADC_INR

U3

XL1509-50

VIN

3.3V

VCC

GND

3.3V

1
2

L8

BEAD

R13
0R

MCLK _ O

ASDATA_O

LRCI N_ O
BCLK_ O

S1

S2

RSTB

RST

C26
1uF

3.3V

C1

C5
100nF

1uF

L7
bead

VCC

C11
100uF/35V

C12
1uF

DGND

10K

R26
1Meg

MCLK _ O

ASDATA

ABCLK
ALRCI N AD C_ RST

R24

M0

VL

JP2

0.1uF

R7
100kR6100k

C27

1
2
3
4
5
6

3.3V

R22 1K

R23 1K

JP3

ADC

C25

0.1uF

R25

1Meg

U2

1

M0

2

MCLK

3

VL

4

SDOUT

5

GND

6

VD

7

SCLK
LRCK8RST

CS5340

R27
0R

C60
10uF

1
2
3
4
5
6

I2S

C36
1nF

3

FB

SD4GND5GND6GND7GND

8

R35

100K

JP6

123

R4

AD

10K

C20 1uF

C2 100nF

C6 100nF

C22

AD C_ RST

R32
0R

L14

2

OUT

1uF

3.3V

R5
100K

C4
100nF

100uH

D1

SS26

C29

470uF/35V

C53

100nF

SDA
SCL

PD
ERROR
RSTB

MCL K
BCLK
LRCIN

SDATA

AD

C52

10uF

24
19

21

5
6

1
2
7

11
12

4
3

10

VCC

+

U1

VCCL A
VCCL B

GNDL

SDA
SCL

PDB
ERROR
RSTB

MCL K
BCLK
LRCLK

SDATA

AD

IS31AP 2111

L2
BEAD

100nF

5V

U4

AMS1117

IN3VO

C18
100nF

VCC

C8

C28

470uF/35V

VCCR A
VCCR B

OUTL A

OUTL B

OUTR A

OUTR B

BEAD

+

GNDR

DVDD

DGND

3.3V

2
4

VO

GND

1

C48

100nF

L1

C14

100nF

13
18

16

9

DVDD

8

OUTLA

22

20

OUTLB

OUTRA

15

OUTRB

17

DGND

C49

10uF

100nF

3.3V

R12

OUTL A

C30
470pF

C31

C54

470pF

OUTL B

OUTR A

C32

470pF

C33

470pF

OUTR B

12MHZ

4

0R

1uF

C51

BEAD

L3

R15
10R

R16
10R

BEAD

L4

BEAD

L5

R19
10R

R20
10R

BEAD
L6

NC1GND

Y1

MCLK _ O

OUT3VCC

2

L10

22uH

L11
22uH
L12
22uH

C57
NC

C58
NC

L13

22uF

3.3V

R31

R30

4.7K

4.7K

JP5

SCL

1

SDA

2
3

I2C

C3

100nF

C55

C40

NC

220nF

C41

C56
NC

220nF

C42

220nF

C43

220nF

C34

CON2

1nF

R14
10R

C44

470nF

R17
10R

100nF

C9

C10

100nF

R18
10R

C45
470nF

R21

10R

100nF

C13

SPK_L

C35

1nF

C38

1nF

CON3

SPK_R

C39
1nF

Figure 2: IS31AP2111 Application Schematic

BILL OF MATERIALS

Name Symbol Description Qty Supplier Part No.

Amplifier U1 Digital Audio Amplifier 1 ISSI IS31AP2111

A/D

Converter

U2 Multi-bit audio A/D Converter 1

CIRRUS

LOGIC

CS5340

Buck U3 Buck DC to DC Converter 1 XLSEMI XL1509

LDO U4 3.3V voltage Regulator 1 AMS AMS1117

E-Cap C11 100µF,35V,±20%,IND 1

Capacitor

C1,C12,C15,C20,C22,

C23,C24,C26,C51,C59

CAP, 1µF,50V,±10%,SMD 10 Yageo CC0603KKX7R9BB105

C2,C4,C5,C8C6,C14,C

Capacitor

18,C27,C29,C48,C53,

CAP,0.1µF,50V,±10%,SMD 14 Yageo CC0603KKX7R9BB104

C54,C25,C50

Capacitor C52,C60 CAP,10µF,25V,±10%,SMD 2 Yageo CC1206KKX7R8BB106

Capacitor C49 CAP,10µF,10V,±10%,SMD 1 Yageo CC0805KKX7R6BB106

E-Cap C28,C29 470µF,35V, ±20%,IND 2

Capacitor C30~C33 CAP,470pF,50V,±10%,SMD 4 Yageo CC0603KKX7R9BB471

Capacitor C34~C39 CAP,1nF,50V,±10%,SMD 6 Yageo CC0603KKX7R9BB102

Capacitor C44,C45 CAP,0.47µF,50V,±10%,SMD 2 Yageo CC0603KKX7R9BB474

Integrated Silicon Solution, Inc. – www.issi.com 3

Rev . A, 12/19/2014