PAM8012 User Guide

PAM8012
EVB User Guide
PAM8012-EV Board User Guide
AE Department
1. Revision Information
Date
2011/06/09
Revision
V1.0
Description
Initial Release
Comment
2. Key Features


1.0W/2.0W@<1% THD Output with a

Supply Voltage from 2.5V to 5.5 V
8Ω/4ΩLoad at 5V Supply

Auto Recovering Short Circuit Protection
Maximum Output Power Can Be Set by One

Over Temperature Protection
External Resistor

9 Ball, 1.3mm x 1.3mm, 0.4mm Pitch WCSP

Minimized ON/OFF Pop Noise

Superior Low Noise

High PSRR
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.
PAM8012
EVB User Guide
3. EV Board Schematic
VCC
VCC EN
EN
EN
C4
1
2
3
IN-
Audio
EN
C1
VDD
U1
OUT+
PL
GND
IN+
VR EF
PAM8012
C2
OUT-
SPK
PL
VCC PL
C5
VCC
C3
PL
RT1
1
2
3
Figure 1
4. PAM8012 TB13AA Description
The PAM8012 is a 2.0W mono filter less class-D amplifier with high PSRR and differential input that reduce
noise.
Features like 89% efficiency and small PCB area make the PAM8012 Class-D amplifier ideal for cellular
handsets. The filter less architecture requires no external output filter, fewer external components, less PCB
area and lower system costs, and simplifies application design.
The PAM8012 features anti-saturation function which detect output signal clip due to the over input level
and keep the output non-saturation automatically to get the excellent sound quality.
The maximum output power without clip can be set by one resistor at PL pin that to prevent the speaker to
be damaged.
The PAM8012 features short circuit protection and over temperature protection.
The PAM8012 is available in tiny WCSP9 (1.3mm x 1.3mm) package.
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.
PAM8012
EVB User Guide
5. EV Board View
Power In: 2.5V-5.5V
Audio Input
Enable Control Selection Jump
Speaker Output
PL Set Selection Jump
EV board Operational sequence:
a. Preset the power supply to between 2.5V and 5.5V.
b. Turn off the power supply.
c.
Connect power supply to EV board power.
d. Connect audio input from audio input jack.
e. Connect the Speaker to the output jack
f.
Turn on the power supply
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.
PAM8012
EVB User Guide
EV Board BOM List
Item
Value
Type
Rating
Description
Vender and port
C1,C2
0.1µF
X5R/X7R,
Ceramic/0603
10V
Input coupling CAP
LMK063BJ104KP-F
C3
1µF
X5R/X7R,
Ceramic/0603
10V
VREF decoupling CAP
TMK107B7105KA-T
C5
1µF
X5R/X7R,
Ceramic/0603
10V
PL decoupling CAP
TMK107B7105KA-T
C4
1µF
X5R/X7R,
Ceramic/0805
10V
VDD decoupling CAP
TMK107B7105KA-T
6. External Components Selection
Input Capacitors (C1, C2)
(1) Form a high pass filter with Ri, and the cut off frequency is fc=1 /2∏Ri*C i
(2) Have a tolerance of 10% or better for matching: any mismatch in capacitance causes an
important mismatch at the corner frequency.
(3) Low leakage current needed, 1uF, X5R/X7R ceramic
Power Supply decoupling Caps ( C4)
(1) Low ESR for good THD, PSRR
(2) C4, Additional 1uF 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
(3) Need place very closed to the IC
VREF Capacitor (C3)
(1). 1µF ceramic recommend
(2). Need place very closely to the pin for good THD, PSRR
7. PCB Layout Guidelines
Grounding
(1). Use plane grounding
(2). Output noise grounds must tie to system ground at the power in exclusively.
(3). Signal currents for the inputs need to be returned to quite ground.
This ground only ties to the signal components and the GND pin.
Power Supply
(1) Recommend that the all the trace could be routed as short and thick as possible.
(2) Any barricade placed in the trace could result in the bad performance of the amplifier.
Others
(1) The power supply capacitors (C4) need to place very close to the PAM8012’s pins.
(2) Input capacitors (C1, C2) place closed to input pin as near as possible
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.
PAM8012
EVB User Guide
8. PCB Layout Guidelines
Top Layer
Bottom Layer
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.