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參數(shù)資料
| 型號： | LM4874 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown |
| 中文描述： | 2.1W差分輸入，BTL輸出立體聲音頻放大器可選增益和關(guān)機(jī) |
| 文件頁數(shù)： | 4/21頁 |
| 文件大?。?/td> | 869K |
| 代理商： | LM4874 |
Electrical Characteristics for LM4874
(Notes 2, 8) (Continued)
Note 6:
Machine Model, 220pF-240pF discharged through all pins.
Note 7:
The given
θ
JA
is for an LM4874 packaged in an MXA20Awith the exposed-DAP soldered to an exposed 2in
2
area of 1oz printed circuit board copper. When
driving 4
loads from a 5V supply, the LM4874MH must be mounted to the circuit board and its exposed-DAP soldered to an exposed 2in
area of 1oz PCB copper.
Note 8:
Typicals are measured at 25C and represent the parametric norm.
Note 9:
Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 10:
Datasheet minimum and maximum specification limits are guaranteed by design, test, or statistical analysis.
Note 11:
Output power is measured at the amplifier’s package pins.
Note 12:
When driving 3
or 4
loads and operating on a 5V supply, the LM4874MH must be mounted to a circuit board that has a minimum of 2in
2
of exposed,
uninterrupted copper area connected to the MH package’s exposed DAP.
External Components Description
See
Figure 1
.
Components
1.
Functional Description
C
i
The input coupling capacitor blocks DC voltage at the amplifier’s inverting input terminals. C
i
, along with the
LM4874’s variable input resistance R
1
(See Table 1), creates a highpass filter with f
C
= 1/(2
π
R
i
C
i
). Both
inverting and noninverting inputs require a C
i
. Refer to the Application Information section,
SELECTING
EXTERNAL COMPONENTS,
for an explanation of determining the value of C
i
.
The supply bypass capacitor. Refer to the
POWER SUPPLY BYPASSING
section for information about
properly placing, and selecting the value of, this capacitor.
The capacitor, C
B
, filters the half-supply voltage present on the BYPASS pin. Refer to the Application
Information section,
SELECTING EXTERNAL COMPONENTS,
for information concerning proper placement
and selecting C
B
’s value.
2.
C
S
3.
C
B
Typical Performance Characteristics
MH Specific Characteristics
THD vs Frequency
THD vs Frequency
20046998
V
DD
= 5V, R
L
= 4
, P
OUT
= 1000mW,
A
V
= 21.6dB, A
V
= 15.6dB,
A
V
= 10dB, A
V
= 6dB
20046997
V
= 5V, R
= 8
, P
= 400mW,
at (from top to bottom at 1kHz):
A
V
= 21.6dB, A
V
= 15.6dB,
A
V
= 10dB, A
V
= 6dB
L
www.national.com
4
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PDF描述 |
|---|---|
| LM4874MH | 2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown |
| LM4876 | 1.1W Audio Power Amplifier with Shutdown Logic Low |
| LM4876M | 1.1W Audio Power Amplifier with Shutdown Logic Low |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4874MH | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown |
| LM4874MH/NOPB | 功能描述:IC AMP AUDIO PWR 2.6W AB 20TSSOP 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) |
| LM4875 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch |
| LM4875M | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4875M/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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