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PDF PAM8007 Data sheet ( Hoja de datos )
| Número de pieza | PAM8007 | |
| Descripción | FILTERLESS 3W CLASS-D STEREO AUDIO AMPLIFIER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PAM8007 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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A Product Line of
Diodes Incorporated
PAM8007
FILTERLESS 3W CLASS-D STEREO AUDIO AMPLIFIER
with DC VOLUME CONTROL and HEADPHONE OUTPUT
Description
The PAM8007 is a 3W, Class-D audio amplifier with headphone
amplifier. Advanced 64-Step DC volume control minimizes external
components and allows speaker volume control and headphone
volume control. It offers low THD+N, to produce high-quality sound
reproduction. The new filterless architecture allows the device to drive
the speaker directly, without low-pass output filters which will save
30% system cost and 75% PCB area.
With the same numbers of external components, the efficiency of the
PAM8007 is much better than class-AB cousins. It can extend the
battery life thus be ideal for portable applications.
The PAM8007 is available in a SSOP-24 and SOP-24 package.
Pin Assignments
Features
• 3W Output at 10% THD with a 4Ω Load and 5V Power Supply
• Filterless, Low Quiescent Current and Low EMI
• Low THD+N
• 64-Step DC Volume Control
• Headphone Output Function
• Superior Low Noise
• Low Pop Noise
• Efficiency Up to 92%
• Short Circuit Protection
• Thermal Shutdown
• Few External Components to Save the Space and Cost
• Pb-Free Package
Applications
• LCD Monitors / TV Projectors
• Notebook Computers
• Portable Speakers
• Portable DVD Players, Game Machines
• VoIP/Speaker Phones
PAM8007
Document number: DSxxxxx Rev. 1 - 2
1 of 17
www.diodes.com
October 2012
© Diodes Incorporated
1 page  
A Product Line of
Diodes Incorporated
PAM8007
Typical Performance Characteristics (@TA = +25°C, unless otherwise specified.)
Speaker
PAM8007
Document number: DSxxxxx Rev. 1 - 2
5 of 17
www.diodes.com
October 2012
© Diodes Incorporated
5 Page 
A Product Line of
Diodes Incorporated
PAM8007
Application Information
Mute Operation
The MUTE pin is an input for controlling the output state of the PAM8007. A logic low on this pin disables the outputs, and a logic high on this
pin enables the outputs. This pin may be used as a quick disable or enable of the outputs without a volume fade. Quiescent current is listed in
the electrical characteristics table. The MUTE pin can be left floating due to the internal pull-up.
For the best power on/off pop performance, the amplifier should be placed in the MUTE mode prior to turning on/off the power
supply.
Shutdown Operation
In order to reduce power consumption while not in use, the PAM8007 contains shutdown circuitry to turn off the amplifier’s bias circuitry. The
amplifier is turned off when logic low is placed on the SHDN pin. By switching the SHDN pin connected to GND, the PAM8007 supply current
draw will be minimized in idle mode. The SHDN pin can be left floating due to the internal pull-up.
Line/Ear Operation
In order to control the speaker/headphone switch, the PAM8007 contains detect circuitry. When line/ear logic low, speaker actice; when logic
high, earphone active.
Power Supply Decoupling
The PAM8007 is a high performance CMOS audio amplifier that requires an adequate power supply decoupling to ensure the output THD and
PSRR are as low as possile. Power supply decoupling affects low frequency on the power supply leads for higher frey response. Optimum
decoupling is achieved by using two capacitors of different types that target different types of noise frequency tranisients, spike, or digital hash
on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 1.0µF, placed as close as possible to the device VDD
terminal works best. For filtering lower-frequency noise signals, a large capacitor of 10µF (ceramic) or greater placed near the audio power
amplifier is recommended.
Input Capacitor (CI)
Large input capacitors are both expensive and space hungry for portable designs. Clearly, a certai sized capacitor is needed to couple in low
frequencies without severe attenuation. But in many cases the speakers used in portable systems, whether internal or external, have little ability
to reproduce signals below 100Hz to 150Hz. Thus, using a large input capacitor may not increase actual system performance. In this case,
inout capacitor (CI) and input resistance (RI) of the amplifier form a high-pass filter with the corner frequency determined equation below;
fC
=
1
2ΠRI CI
In addition to system cost and size, click and pop performance is affected by the size of the input coupling capacitor, CI. A larger inout coupling
capacitor requires more charge to reach its quiescent DC voltage (nominally ½ VDD). This charge comes from the internal circuit via the
feedback and is apt to create pops upon device enable. Thus, by minmizing the capacitor size based on necessary low frequency response,
turn-on pops can be minimized.
Analog Reference Bypass Capacitor (CBYP)
Analog Reference Bypass Capacitior (CBYP) is the most critical capacitor and serves several important functions. During start-up or recovery
from shutdown mode, CBYP determines the rate at which the amplifier starts up. The second function is to reduce noise produced by the power
supply caused by coupling into the output device signal. The noise is from the internal analog reference to the amplifier, which appears as
degraded PSRR and THD+N.
A ceramic bypass capacitor (CBYP) of 0.47µF to 1.0µF is recommended for the best THD and noise performance. Increasing the bypass
capacitor reduces clicking and popping noise from power on/off and entering and leaving shutdown.
Short Circuit Protection (SCP)
The PAM8007 has short circuit protection circuitry on the outputs that prevents the device from damage when output-to-output and output-to
GND short. When a short circuit is detected on the outputs, the outputs are disabled immediately. If the short was removed, the device
activates again.
PAM8007
Document number: DSxxxxx Rev. 1 - 2
11 of 17
www.diodes.com
October 2012
© Diodes Incorporated
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet PAM8007.PDF ] | |
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