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参数资料
| 型号： | LM4840MT/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28 |
| 封装： | TSSOP-28 |
| 文件页数： | 6/22页 |
| 文件大小： | 829K |
| 代理商： | LM4840MT/NOPB |
Application Information (Continued)
Table 1: Logic Level Truth Table
SD
BEEP
DETECT
MUTE
HP
SENSE
MODE
R-
R+
L-
L+
L
BTL SPK
ON
L
H
HP
ON
ON (buffer)
ON
OFF
L
H
L
BTLSPK
ON
*Amps are muted
L
H
HP
ON
ON (buffer)
ON
OFF
*Amps are muted
*Next four conditions, beep is detected; beep signal added to audio signal and bypasses volume control (unity)
L
H
L
BTL SPK
ON
L
H
L
H
HP
ON
ON (buffer)
ON
L
H
L
BTL SPK
ON
*Dual Mode
L
H
HP
ON
ON (buffer)
ON
*Dual Mode
*Next eight conditions turns off all amps
H
L
BTL SPK
OFF
H
L
H
HP
OFF
H
L
H
L
BTL SPK
OFF
H
L
H
HP
OFF
H
L
BTL SPK
OFF
H
L
H
HP
OFF
H
L
BTL SPK
OFF
H
HP
OFF
*Beepdetect signal overrides any mute. For example, if amp is muted and bpdetect is HIGH, then amp is no longer muted.
**Dual mode: When HP jack is inserted, load A (speaker corresponding to outputs A- and A+) is physically disconnected. Load
B remains connected; however, amp B+ is off and differentially there is no voltage across it. If a beep is detected (i.e. beepdetect
= HIGH), then summed signal (audio + beep signals) is heard in the headphones and on speaker B.
LM4840
www.national.com
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相关代理商/技术参数 |
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|---|---|
| LM4841 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Stereo 2W Amplifiers with DC Volume Control, Transient Free Outputs, and Cap-less Headphone Drive |
| LM48410 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Low EMI, Filterless, 2.3W Stereo Class D Audio Power Amplifier with National 3D Enhancement |
| LM48410SQ | 制造商:Texas Instruments 功能描述:Audio Amp Speaker 2-CH Stereo 2.3W Class-D 24-Pin LLP EP T/R 制造商:Texas Instruments 功能描述:AMP, POWER, CLASS D, 2.3W, LLP-24 |
| LM48410SQ/NOPB | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LM48410SQBD | 功能描述:音频 IC 开发工具 LM48410 EVAL BOARD RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
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