- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384605 > LP3950SLX (NATIONAL SEMICONDUCTOR CORP) Color LED Driver with Audio Synchronizer PDF資料下載
參數(shù)資料
| 型號： | LP3950SLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅動器 |
| 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)： | 19/31頁 |
| 文件大?。?/td> | 1085K |
| 代理商： | LP3950SLX |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁當前第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁
Audio Synchronization
The LEDs connected to the RGB outputs can be synchro-
nized to incoming audio signal with Audio Synchronization
feature. Audio Synchronization has two modes.
Amplitude
mode
synchronizes LEDs based on the peak amplitude of
the input signal. In the amplitude mode the user can select
one of three amplitude mapping options. The
frequency
mode
synchronizes the LEDs based on bass, middle and
treble amplitudes (= low pass, band pass and high pass
filters). The user can select between two different responses
of frequency for best audio-visual user experience. Both of
the modes provide a control for speed of the mapping with
four different speed configurations. Programmable gain and
AGC (Automatic Gain Control) function are also available for
adjustment of the optimum audio signal mapping. The Audio
Synchronization functionality is described more closely be-
low.
INPUT SIGNAL TYPE
The LP3950 support four types of analog audio input signals
for audio synchronization
1.
Single ended audio
2.
Differential audio
3.
Stereo
4.
Single ended and differential audio.
Figure 15
shows how to wire the LP3950 audio inputs case
by case (NC = Not Connected).
USING A DIGITAL PWM AUDIO SIGNAL AS AN AUDIO
SYNCHRONIZATION SOURCE
If the input signal is a PWM signal, use a first or second
order low pass filter to convert the digital PWM audio signal
into an analog waveform. There are two parameters that
need to be known to get the filter to work successfully:
frequency of the PWM signal and the voltage level of the
PWM signal. Suggested cut-off frequency (-3dB) should be
around 2 kHz to 4 kHz and the stop-band attenuation at
sampling frequency should be around -48dB or better. Use a
resistor divider to reduce the digital signal amplitude to meet
the specification of the analog audio input. Because a low-
order low-pass filter attenuates the high-frequency compo-
nents from audio signal, MODE_CONTROL=[01] selection is
recommended when frequency synchronization mode is en-
abled.
Figure 23
shows an example of a second order
RC-filter for 29 kHz PWM signal with 3.3V amplitude. Active
filters, such as a Sallen-Key filter, may also be applied. An
active filter gives better stop-band attenuation and cut-off
frequency can be higher than for a RC-filter.
To make sure that the filter rolls off sufficiently quickly, con-
nect your filter circuit to the audio input(s), turn on the audio
synchronization feature, set manual gain to maximum, apply
the PWM signal to the filter input and keep an eye on LEDs.
If they are blinking without an audio signal (modulation), a
sharper roll-off after the cut-off frequency, more stop-band
attenuation, or smaller amplitude of the PWM signal is
required.
Schematic Diagram
20129327
FIGURE 15. Wiring Diagram for LP3950 Audio Inputs
L
www.national.com
19
相關PDF資料 |
PDF描述 |
|---|---|
| LP3952 | 6-Channel Color LED Driver with Audio Synchronization |
| LP3952RLX | 6-Channel Color LED Driver with Audio Synchronization |
| LP3952RL | 6-Channel Color LED Driver with Audio Synchronization |
| LP39542 | Zener Diode; Application: Low noise; Pd (mW): 250; Vz (V): 4.3 to 4.7; Condition Iz at Vz (mA): 0.5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: LLD |
| LP39542RL | Zener Diode; Application: Low noise; Pd (mW): 250; Vz (V): 4.6 to 5.0; Condition Iz at Vz (mA): 0.5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: LLD |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 內部驅動器: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 供應商設備封裝: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 |
| LP3952RL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:6-Channel Color LED Driver with Audio Synchronization |
| LP3952RL/NOPB | 功能描述:LED照明驅動器 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| LP3952RLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:6-Channel Color LED Driver with Audio Synchronization |
發(fā)布緊急采購，3分鐘左右您將得到回復。