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參數(shù)資料
| 型號： | LP3950SL |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Color LED Driver with Audio Synchronizer |
| 中文描述： | LED DISPLAY DRIVER, QCC32 |
| 封裝： | 4.50 X 5.50 MM, 0.80 MM HEIGHT, 0.50 MM PITCH, CSP-32 |
| 文件頁數(shù)： | 20/31頁 |
| 文件大?。?/td> | 1085K |
| 代理商： | LP3950SL |
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Audio Synchronization
(Continued)
INPUT BUFFERING
Figure 16
describes the LP3950 audio input buffering struc-
ture in high level. The electric parameters of the buffers are
described in
Table Audio Synchronization Characteristics
.
Operational amplifiers for both buffers are rail-to-rail input
opamps. The single ended buffer is simply a voltage follower.
DC level of the input signal is generated by a resistor divider.
The differential amplifier is a basic differential-to-single-
ended converter.
AUDIO SYNCHRONIZATION SIGNAL PATH
LP3950 audio synchronization is mainly done digitally and it
consists of following signal path blocks (see
Figure 17
)
Input buffers
Multiplexer
AD converter
DC remover
Automatic gain control (AGC) / programmable gain
3 band digital filter
Peak detector
Look-up tables (LUT)
Mode selector
Integrators
PWM generator
The digitized input signal has a DC component that is re-
moved by the digital
DC REMOVER
(-3 dB
@
A
400 Hz). The
automatic
GAIN CONTROL
adjusts the input signal to suit-
able range automatically. User can disableAGC and the gain
can be set manually with
PROGRAMMABLE GAIN
. The
LP3950 has two audio synchronization modes: amplitude
and frequency. For amplitude based synchronization the
PEAK DETECTION
method is used. For frequency based
synchronization the three-way crossover
FILTER
separates
high pass, low pass and band pass signals. For both modes,
a predefined lookup table (LUT) is used to match the audio
visual effect. The
MODE SELECTOR
selects the synchroni-
zation mode. Reaction speed can be selected using
INTE-
GRATOR
speed variables. Finally
PWM GENERATOR
sets
the driver FETs duty cycles.
Schematic Diagram
20129331
FIGURE 16. Audio Input Buffer Structure
Functional Block Diagram
20129332
FIGURE 17. Signal Path Block Diagram
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3950SL/CSP1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LP3950SL/NOPB | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LP3950SLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Color LED Driver with Audio Synchronizer |
| LP3950SLX/NOPB | 功能描述:IC LED DRVR WHITE BCKLGT 32-TSCP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:PowerWise® 標準包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓撲:PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| LP3952 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:6-Channel Color LED Driver with Audio Synchronization |
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