參數(shù)資料
型號： LP55281TLX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 顯示驅(qū)動器
英文描述： Quad RGB Driver
中文描述： LED DISPLAY DRIVER, PBGA36
封裝： 3 X 3 MM, 0.60 MM HEIGHT, 0.50 MM PITCH, MICRO SMD-36
文件頁數(shù)： 15/28頁
文件大?。?/td> 1313K
代理商： LP55281TLX
Audio Synchronization
The ALED output can be synchronized to incoming audio with
Audio Synchronization feature. Audio Synch synchronizes
ALED based on input signal's peak amplitude. Programmable
gain and automatic gain control function are also available for
adjustment of input signal amplitude to light response. Control
of ALED brightness refreshing frequency is done with four
different frequency configurations. The digitized input signal
has DC component that is removed by a digital dc-remover
(-3 dB @ 500 Hz). LP55281 has a 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.
LP55281 audio synchronization is mainly realized digitally
and it consists following signal path blocks (see figure below)
Input buffer
AD converter
Automatic Gain Control (AGC) and manually
programmable gain
Peak detector
CONTROL OF AUDIO SYNCHRONIZATION
The following table describes the controls required for audio
synchronization. ALED brightness control through serial in-
terface is not available when audio synchronization is en-
abled.
Audio Synchronization Control (Registers 0Dh and 0Eh)
GAIN_SEL
[2:0]
Register
0Dh
Bits 7-5
Register
0Dh
Bit 4
Register
0Dh
Bits 3
Register
0Dh
Bits 2
Register
0Dh
Bits 1-0
Register
0Eh
Bits 3-0
Input signal gain control. Gain has a range from 0 dB to -46 dB.
[000] = 0 dB, [001] = -6 dB, [010] = -12 dB, [011] = -18 dB,
[100] = -24 dB, [101] = -31 dB, [110] = -37 dB, [111] = -46 dB
Control of the high-pass filter's corner frequency:
0 = 80 Hz
1 = 510 Hz
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.
DC_FREQ
EN_AGC
EN_SYNC
Audio synchronization enabled. Set EN_SYNC = 1 to enable audio synchronization or 0 to disable.
SPEED_CTRL
[1:0]
Control for refreshing frequency. Sets the typical refreshing rate for the ALED output
[00] = FASTEST, [01] = 15 Hz, [10] = 7.6 Hz, [11] = 3.8 Hz
THRESHOLD
[3:0]
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.
Audio Input Threshold Setting (Register 0Eh)
THRESHOLD[3:0]
Threshold Level, mV (typical)
0000
0001
0010
...
1110
1111
Disabled
0.2
0.4
...
2.5
2.7
Typical Gain Values vs Audio Input Amplitude
Audio Input Amplitude mV
P-P
0 to 10
0 to 20
0 to 40
1 to 85
3 to 170
5 to 400
10 to 800
20 to 1600
Gain Value dB
0
-6
-12
-18
-24
-31
-37
-46
15
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參數(shù)描述
LP55281TLX/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
LP-554770-2S-4M 制造商:Alpha 3 Manufacturing 功能描述:
LP5550 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PowerWise Technology Compliant Energy Management Unit
LP5550SQ 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
LP5550SQ/NOPB 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
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