參數(shù)資料
型號： LM4857GR/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PBGA49
文件頁數(shù)： 4/40頁
文件大?。?/td> 1948K
代理商： LM4857GR/NOPB
External Components Description
Components
Functional Description
1.
C
IN
This is the input coupling capacitor. It blocks the DC voltage and couples the input signal to the
amplifier’s input terminals. C
IN also creates a highpass filter with the internal resistor Ri (Input
Impedance) at f
c = 1/(2
πR
iCIN).
2.
C
S
This is the supply bypass capacitor. It filters the supply voltage applied to the V
DD pin and helps
reduce the noise at the V
DD pin.
3.
C
B
This is the BYPASS pin capacitor. It filters the V
DD / 2 voltage and helps maintain the LM4857’s
PSRR.
4.
C
OUT
This is the output coupling capacitor. It blocks the DC voltage and couples the output signal to the
speaker load R
L.COUT also creates a high pass filter with RL at fO = 1/(2
πR
LCOUT).
5.
R
3D
This resistor sets the gain of the National 3D effect. Please refer to the National 3D Enhancement
section for information on selecting the value of R
3D.
6.
C
3D
This capacitor sets the frequency at which the National 3D effect starts to occur. Please refer to the
National 3D Enhancement section for information on selecting the value of C
3D.
Typical Performance Characteristics (Note 11)
LM4857SP THD+N vs Frequency
20079755
V
DD = 5V; LLS, RLS; PO = 400mW;
R
L =4
; Mode 7; 0dB Gain
20079756
V
DD = 3V; LLS, RLS; PO = 200mW;
R
L =4
; Mode 7; 0dB Gain
LM4857
www.national.com
12
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4857ITL 制造商:Texas Instruments 功能描述:1.2W STEREO SUBSYST 3D SMD 4857
LM4857ITL/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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
LM4857ITLBD 功能描述:BOARD EVALUATION LM4857ITL RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:-
LM4857ITLX/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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
LM4857SP 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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