Transcript
CSEVB6204R1 Application Note
CS6A4989 Demo Board (Version 1) Features and Key Specification
Applications Headphone amplifier
Supply Voltage Embedded Pre-amplifier Number of output channels Low quiescent current Output capacitor less technology
±5 ~ ±11 V Differential Input Stage 2 (stereo) less than 15mA
Connections 3.5mm audio jack Speakers screw wire connector Power supply screw wire connector
General Description This application note showing the stereo audio power amplifier demo board which designed to operate with the audio power amplifier for ICs CS6A4989. The demo board can work with supply voltage between ±5V to ±15V for driving a stereo channel headphone. It is a good candidate for being a pre-amplifier for the portable Hi-Fi WAV player. Under high output power application, heat sink installed onto the CS6A4989 IC is required, to avoid overheat damage. The demoboard is designed that amplifier IC (CS6A4989) can be laid horizontally with the demoboard, so a heat sink can be mounted beneath both the demoboard and amplifier IC. Besides heat sink installation, fan cooling is also recommended during output power application. The recommended optimal operating setup (in stereo mode) for this demo board is
Stereo headphone (with 32 loading in each channel) ±9V power supply with 90mA peak current ±0.5V peak audio input
Figure 1. Photo of CS6A4989 Amplifier Demo Board Page 1
CSEVB6204R1 Application Note
Rev A. July 2015
CS6A4989 Demo Board (Version 1)
CSEVB6204R1
CSEVB6204R1 Canaan Semiconductor
Rev A. July 2015
Demo Board Schematic (Inverted Amplifier)
CS6A4989
Bill of Material of Demoboard For audio amplifier with +/-9V power supply CSEVB6204R1d a 32 speaker/headphone (signal gain : 470/27≈17.4) Part
Value
Package
Description
Source
CS6A4989
SIP-10
Audio Power Amplifier
CS
C101, C102
1µF
0603
Mylar Chip Capacitor
AVX
C103, C104
47µF
Radial
40V Polar Capacitor
Elna
R101, R103, R105, R106
27K
0603
Chip Resistor
Samsung
R102, R104
470K
0603
Chip Resistor
Samsung
R107, R108
0.05
Axial
1/4W 1% Metal Film Resistor
Fu-Futaba
R109, R110
6.8K
0603
Chip Resistor
Samsung
8 ~ 300
external
Externally connected Speaker / headphone
Variety
U1
LS1, LS2
*** Please refer to the datasheet of CS6A4989 for the non-inverted amplifier schematic.
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CSEVB6204R1 Canaan Semiconductor
Rev A. July 2015
Demo Board Connection Description
Pin Name
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Description
J1
3.5mm Stereo Audio Input
J2
Voltage Power Supply Connector
J3
Audio Output Connector
Warning: The circuit does not have output short circuit protection, nor thermal runaway protection. A simple thermal sensor CSEVB6204R1d relay that connects the speaker (load) to the demo board is required to protect the ICs from burnt out
CSEVB6204R1 Canaan Semiconductor
Rev A. July 2015
Demo Board Application 1: Stereo Audio Output (for headphone application) U1: CS6A4989
CS6A4989
Audio IN
3.5mm stereo audio jack (To headphone)
-VDD
+VDD GND
Recommended power input: ±9V Headphone (8 ~ 300 in each CSEVB6204R1 channel)
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CSEVB6204R1 Canaan Semiconductor
Rev A. July 2015
Demo Board layout
PCB Top Overlay
PCB Top Layer
PCB Bottom Layer
PCB Dimension
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CSEVB6204R1 Canaan Semiconductor
Rev A. July 2015
Application Note
Speaker/headphone with resistance lower than is not recommended Supply voltage higher than ±11V is not recommended Output voltage of this evaluation can up to 5VPP, please make sure the speaker/headphone can sustain such a high output voltage. If no, please adjust the signal gain of the demoboard. Audio signal gain can be adjusted by following equation: Gain for right channel =R104/R103 Gain for left channel = R102/R101 Reference to CS6A4989 datasheet before operation
Summary
The demo board demonstrates the features of CS6A4989
Additional Information For technical questions CSEVB6204R1d application information: Please contact our application engineers.
Datasheet
CS6A4989
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CSEVB6204R1 Canaan Semiconductor
Rev A. July 2015
Revision History Date
Rev
Description
July 2015
A
First Release
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CSEVB6204R1 Canaan Semiconductor
Rev A. July 2015
IMPORTANT NOTICE The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable. Canaan Semiconductor (CS) does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied. CS reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. No liability will be accepted by CS for any consequence of its use. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. CS integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in lifesupport applications, devices or systems or other critical applications. Use of CS products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer’s applications, the customer should provide adequate design and operating safeguards.
Headquarter Canaan Semiconductor Limited Unit 8, 12/F, Wah Yiu Industrial Centre 30-32 Au Pui Wan Street, Fotan Shatin, N.T., HONG KONG Tel : (852)-3619-6533
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