參數(shù)資料
型號(hào)： LM4682SQ
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 音頻／視頻放大
英文描述： 10 Watt Stereo CLASS D Audio Power Amplifier with Stereo Headphone Amplifier and DC Volume Control
中文描述： 10 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC48
封裝： LLP-48
文件頁(yè)數(shù)： 6/22頁(yè)
文件大?。?/td> 1033K
代理商： LM4682SQ
Over-Modulation Protection
The LM4682’s over-modulation protection is a result of the
preamplifier’s inability to produce signal magnitudes that
equal the power supply voltages. Since the preamplifier’s out-
put magnitude will always be less than the supply voltage, the
duty cycle of the amplifier’s switching output will never reach
zero. Peak modulation is limited to a nominal 95%.
DC Volume Control
The LM4682 has an internal stereo volume control whose
setting is a function of the DC voltage applied to the volume
control pin VOLCTL.
The LM4682 volume control consists of 31 steps, which are
individually selected by a variable DC voltage level on the
VOLCTL pin. A linear type 100k
potentiometer is used to
adjust the VOLCTL voltage in the LM4682 demonstration
board as shown in application circuit (see Figure 1). The re-
sistance value of potentiometer fall in the range from 10k
to
100k
is recommended to be used with only small amount of
current dissipation and large enough for the VOLCTL pin to
function properly. The Volume Control Characteristics of
LM4682 can be found in the Typical Performance Character-
istics section. The gain range of Class D amplifiers are from
–48dB to 30dB. The gain range of headphone amplifiers are
from –65dB to 13dB. Each gain step corresponds to specific
input voltage of both Class D amplifiers and headphone am-
plifiers are shown in Table 2.
To minimize the effect of noise on the volume control VOLCTL
pin, which can affect the selected gain level, hysteresis has
been implemented. The amount of hysteresis corresponds to
half of the step width. For highest accuracy, the voltage shown
in the “recommended voltage” column of the table is used to
select a desired gain. The recommended voltage is exactly
halfway between the two closest transitions to the next high-
est or next lowest gain levels.
www.national.com
14
LM4682
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4682SQ/NOPB 功能描述:IC AMP AUDIO PWR 10W STER 48LLP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機(jī)，2-通道（立體聲） 在某負(fù)載時(shí)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(diǎn):I²C，麥克風(fēng)，靜音，短路保護(hù)，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR)
LM4682SQBD 功能描述:BOARD EVALUATION LM4682SQ RoHS:否 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:-
LM4682SQX/NOPB 功能描述:IC AMP AUDIO PWR 10W STER 48LLP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機(jī)，2-通道（立體聲） 在某負(fù)載時(shí)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(diǎn):I²C，麥克風(fēng)，靜音，短路保護(hù)，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR)
LM4684LD/NOPB 制造商:Texas Instruments 功能描述:
LM4700 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Overture⑩ Audio Power Amplifier Series 30W Audio Power Amplifier with Mute and Standby Modes
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