PAM8406 User Guide

PAM8406
EVB User Guide
PAM8406 EV Board User Guide
AE Department
1. Revision Information
Date
2011/11/25
Revision
V1.0
Description
Initial Release
Comment
2. EV Board Schematic
VDD
J5
2
1
+
VDD
C13
C7
R3
C3
C6
C1
R1
SP1
+OUT-L
+OUT-R
1
PGND-L
PGND-R
3
-OUT-L
-OUT-R
PVDD-L
2
FB2
4
5
Mode
J4
MUTE
6
VDD
7
INL
8
VREF
C5
C10
FB1
C9
U1
16
15
PVDDR
14
13
SHDN
12
SD
GND
11
INR
10
Mute
9
MODE
PAM8406
C12
FB3
SP2
FB4
C4
C2
R2
C11
C8
VDD
J1
VDD
Mode
1
2
3
Mode
J2
VDD
SD
1
2
3
Mute
SD
J3
VDD
1
2
3
Mute
Figure 1 Demo Board Schematic
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
PAM8406
EVB User Guide
3. PAM8406 Demo Board Description
PAM8406 demo board is design for PAM8406 demo and evaluation, targeted to be used in providing a
simple and convenient evaluation environment for the PAM8406. Requires parts, potentiometer for standard
RCA jacks for audio inputs, pin jacks for power supply and signal outputs, low-pass RC output filter for each
channel, etc. on the board make it easy to be evaluated.
4. EV Board View
Power in:
2.5V to 5.5V
L- Channels Output
Audio Input
R- Channels Output
Class D /Class AB Select
Mute Select Jump
Shutdown Select Jump
Figure 2 Demo Board Top View
EV Board Operational Sequence :
a. Preset the power supply to between 2.5V and 5.5V.
b. Connect power supply to EV board power.
c.
Connect audio input from audio input jack.
d. Connect the SPKs to the output jack.
e. Turn on the power supply and verify that the sound quality of speaker.
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
PAM8406
EVB User Guide
EV Board BOM List
Item
Value
C7,C8
10µF
C3,C4
1µF
C6
1µF
C5
1µF
C1,C2,
1µF
R1,R2
R4
C13
FB1,FB2,FB3,FB4
10K
10Ω
220µF
2A/120Ω
C9,C10,C11,C12,
220pF
Type
X5R/X7R,
Ceramic/0805
X5R/X7R,
Ceramic/0603
X5R/X7R,
Ceramic/0603
X5R/X7R,
Ceramic/0603
X5R/X7R,
Ceramic/0603
0805
0805
Electrolytic
0805
X5R/X7R,
Ceramic/0603
Rating
Description
10V
PVDD main decoupling CAP
10V
PVDD coupling CAP
10V
VDD decoupling CAP
10V
Vref bypass CAP
10V
Input coupling CAP
1%
5%
10V
Input Resistor
Separate AVCC from PVDD
DC coupling CAP
For EMI
10V
5. External Components Selection
Power Supply decoupling Caps (C3, C4, C6, C7, C8)
(1) Low ESR for good THD, PSRR
(2) C3,C4 and C6, 1.0µF ceramic for higher frequency transients, spikes
(3) C7 and C8, Additional 10uF or greater for low frequency noise filtering and serves as a local
storage capacitor for supplying current during large signal transients on the amplifier outputs.
(4) Need place very closed to the IC
Input Capacitors (C1, C2)
(1) Form a high pass filter with Ri, and the cut off frequency is fc=1 /2∏R i*C i
(2) Low leakage current needed, ceramic recommend
Input Resistors (R1, R2)
(1) Limit the closed-loop gain
(2) Form a high pass filter with Ci, and the cut off frequency is fc=1/2*Π*Ri*Ci
(3) 1% tolerance needed for resistor matching to improve CMRR, PSRR
VREF Bypass Capacitor (C5)
(1). 1µF ceramic recommend
(2). Need place very closely to the pin for good THD, PSRR
EMI Eliminate Filter (FB1, FB2, FB3 and FB4)
(1) High impedance at high frequency and very low impedance at low frequency
(2) The current rating is higher than 2A
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
PAM8406
EVB User Guide
6. PCB Layout Guidelines
Grounding
(1) Use plane grounding or separate grounds
(2) Do not use one line connecting power GND and analog GND
(3) Output noise grounds must tie to system ground at the power in exclusively.
(4) Signal currents for the inputs need to be returned to quite ground. This ground only ties to the
signal components and the GND pin.
Others
(1) The power supply de coupling capacitors need to place very close to the PAM8406’s pins.
(2) The output route should be far away from audio input route.
7. PCB Layout Example
Top Layer
Figure 3
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
PAM8406
EVB User Guide
Bottom Layer
Figure 4
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.