- 您現(xiàn)在的位置：買賣IC網 > PDF目錄384606 > LP55271 (National Semiconductor Corporation) Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization PDF資料下載
參數(shù)資料
| 型號： | LP55271 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| 中文描述： | 微小的LED照相機閃光燈和4的I2C可編程性，連接測試和音頻同步發(fā)光二極管驅動器 |
| 文件頁數(shù)： | 13/21頁 |
| 文件大?。?/td> | 826K |
| 代理商： | LP55271 |
Audio Synchronization
The LED1 output can be synchronized to incoming audio
signal with Audio Synchronization feature. Audio Synchroni-
zation synchronizes LED1 based on input signal’s peak am-
plitude. Programmable gain and automatic gain control func-
tion are also available for adjustment of input signal
amplitude to light response. Control of LED1 brightness
refreshing frequency is done with four different frequency
configurations. The digitized input signal has a DC compo-
nent that is removed by a digital DC-remover. The DC-
remover is a high-pass filter where corner frequency is user
selectable by using DC_FREQ bit. LP55271 has 2-channel
audio (stereo) input for audio synchronization, as shown in
the figure below. The inputs accept signals in the range of 0V
to 1.6V peak-to-peak and these signals are mixed into a
single wave so that they can be filtered simultaneously.
LP55271 audio synchronization is mainly done digitally and
it consists following signal path blocks (see figure below).
Input buffer
AD converter
Automatic Gain Control (AGC) and manually program-
mable gain
Peak detector
Automatic Gain Control (AGC) adjusts the input signal to
suitable range automatically. User can disable AGC and the
gain can be set manually with programmable gain. Audio
synchronization is based on peak detection method.
20202416
Audio Synchronization Input Electrical Parameters
Symbol
Z
IN
Parameter
Input Impedance of
ASE1, ASE2
ASE1, ASE2 Audio
Input Level Range
(peak-to-peak)
Conditions
Min
Typ
Max
Units
k
10
15
A
IN
Min input level needs maximum gain;
Max input level for minimum gain.
0
1600
mV
CONTROL OF AUDIO SYNCHRONIZATION
The following table describes the controls required for audio synchronization. LED1 brightness control through serial interface is
not available when audio synchronization is enabled.
Audio Synchronization Control
EN_SYNC
EN_AGC
Audio synchronization enabled. Set EN_SYNC = 1 to enable audio synchronization or 0 to disable.
Automatic gain control. Set EN_AGC = 1 to enable automatic control or 0 to disable.
When EN_AGC is disabled, the audio input signal gain value is defined by GAIN_SEL.
Input signal gain control. Gain has a range from 0 dB to -46 dB.
Control for refreshing frequency. Sets the typical refreshing rate for the LED1 output.
Control for the audio input threshold. Sets the typical threshold for the audio inputs signals.
May be needed if there is noise on the audio lines.
Control for the high-pass filter corner frequency.
0 = 80 Hz
1 = 510 Hz
GAIN_SEL[2:0]
SPEED_CTRL[1:0]
THRESHOLD[3:0]
DC_FREQ
L
www.national.com
13
相關PDF資料 |
PDF描述 |
|---|---|
| LP5527 | Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| LP5527TL | Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| LP5527TLX | Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| LP55281 | Quad RGB Driver |
| LP55281RL | Quad RGB Driver |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LP55271TL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| LP55271TL/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 |
| LP55271TLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| LP55271TLX/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 |
| LP5527TL | 制造商:Texas Instruments 功能描述:DRIVER FLASH LED I2C POWERWISE |
發(fā)布緊急采購，3分鐘左右您將得到回復。