PAM8007 User Guide

PAM8007
EVB User Guide
PAM8007 EV Board User Guide
AE Department
1. Revision Information
Date
2011/03/14
Revision
V1.0
Description
Initial Release
Comment
2. EV Board Schematic
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.
PAM8007
EVB User Guide
3. PAM8007 Demo Board Description
PAM8007 demo board is design for PAM8007 demo and evaluation, targeted to be used in providing a
simple and convenient evaluation environment for the PAM8007. 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
Volume Adjust Bar
Class D BTL
Output
Audio Input
Headphone Jack
Output Test Jump
(Sine-wave monitor)
Muting Jump
Shutdown 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 BTL 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.
PAM8007
EVB User Guide
EV Board BOM List
Item
Value
C8,C9
10µF
C5,C6
1µF
C1,C2,C1E,C2E
1µF
C4
1µF
C7
1µF
C19,C20
FB1,FB2,FB3,FB4
220µF
2A/120Ω
C10,C11,C12,C13
220pF
VR1
50K
Type
X5R/X7R,
Ceramic/0805
X5R/X7R,
Ceramic/0603
X5R/X7R,
Ceramic/0603
X5R/X7R,
Ceramic/0603
X5R/X7R,
Ceramic/0603
Electrolytic
0805
X5R/X7R,
Ceramic/0603
Rating
Description
10V
PVDD main decoupling CAP
10V
PVDD coupling CAP
10V
Input coupling CAP
10V
VDD decoupling CAP
10V
Vref bypass CAP
10V
Class AB output decoupling CAP
For EMI
10V
For EMI
VOL Bias
5. External Components Selection
Power Supply decoupling Caps (C4, C5, C6, C8, C9)
(1) Low ESR for good THD, PSRR
(2) C5,C6 and C4, 1.0µF ceramic for higher frequency transients, spikes.
(3) C8 and C9, Additional 10µF 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, C1E2, C2E)
(1). Form a high pass filter with Ri, and the cut off frequency is fc=1 /2∏R i* Ci
(2). Low leakage current needed, ceramic recommended.
VREF Bypass Capacitor (C7)
(1). 1uF ceramic recommended.
(2). Need place very closely to the pin for good THD, PSRR
Class AB Output Capacitors (C19, C20)
(1). Form a low pass filter with RL, and the cut off frequency is fc=1 /2∏R L*CO i
(2). Low leakage current needed
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.
PAM8007
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 PAM8007’s pins.
(2) The output route should be far away from audio input route.
7. PCB Layout Example
Top Layer
Bottom Layer
Figure 3
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.