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參數(shù)資料
| 型號： | LM4836 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux |
| 中文描述： | 2W的立體聲音頻功率放大器，具有直流音量控制，低音增強和輸入復用器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 658K |
| 代理商： | LM4836 |
Application Information
(Continued)
BASS BOOST FUNCTION
The Bass Boost Function can be toggled by changing the
logic at pin 19. A logic low will switch the power amplifiers to
bass boost mode. In bass boost mode the low frequency
gain of the amplifier is set by the external capacitor.
Whereas a logic high sets the amplifiers to unity gain.
In some cases a designer may want to improve the low fre-
quency response of the bridged amplifier or incorporate a
bass boost feature. This bass boost can be useful in systems
where speakers are housed in small enclosures. If the de-
signer wishes to disable the bass boost feature, pin 19 can
be tied to V
DD
.
When bass boost is enabled, the output amplifiers will be in-
ternally set at a gain of 2 at low frequencies (gain of 4 in
bridged mode). As shown in Figure 2, C
sets the cutoff
frequency for the bass boost. At low frequencies the capaci-
tor will be virtually an open circuit.At high frequencies the ca-
pacitor will be virtually a short circuit. As a result of this, the
gain of the bridge amplifier is increased at low frequencies.A
first order pole is formed with a corner frequency at:
f
c
= 1/(2
π
10k
C
BASS
)
The resulting low frequency differential gain of this bridged
amplifier becomes:
2(10k
+10k
) /10k
= 4
With C
= 0.1 μF, a first order pole is formed with a corner
frequency of 160 Hz. The low frequency boost formulas as-
sume that C
, C
, f
, f
allow the appropriate low fre-
quency response as explained in the
Proper Selection of
External Components
section. See the
Typical Perfor-
mance Characteristics
section for a graph that includes
bass boost performance with various values of C
BASS
.
DC VOLUME CONTROL
The DC voltage at the DC Volume Control pin (pin 5) deter-
mines the attenuation of output of the amplifiers. If the DC
potential of pin 5 is above 4V (typical 80% V
) the internal
amplifiers are set at unity gain. The attenuator range is from
0 dB (pin 5 = 80% V
) to -81 dB (pin 5 = 0V). Any DC volt-
age greater than 4V (or 80% V
) will result in a gain of
unity. Refer to the
Typical Performance Characteristics
for
detailed information of the attenuation characteristics of the
DC Volume Control pin.
www.national.com
13
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| LM4836MT | Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux |
| LM4836MTE | Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux |
| LM4838 | Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain |
| LM4838LQ | Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain |
| LM4838MT | Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM4836LQ | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4836LQ/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4836MT | 制造商:OC White Company 功能描述:Audio Amp Headphone/Speaker 2-CH Stereo 2.2W Class-AB 28-Pin TSSOP Rail |
| LM4836MT/NOPB | 功能描述:IC AMP AUDIO PWR 2.2W AB 28TSSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4836MTE | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux |
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