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| LP3952 Datasheet, PDF (19/46 Pages) National Semiconductor (TI) – 6-Channel Color LED Driver with Audio Synchronization | |||
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www.ti.com
VDDA
10 nF
1 M:
ASE
1 M:
GNDA
LP3952
SNVS518A â JULY 2007 â REVISED MARCH 2013
AUDIO SYNCHRONIZATION ELECTRICAL PARAMETERS (1.65V ⤠VDDIO ⤠VDD1,2V) (unless otherwise
noted)
Parameter
Test Conditions
ZIN
Input Impedance of ASE
AIN
Audio Input Level Range
(peak-to-peak)
Gain = 21 dB
Gain = 0 dB
f3dB
Crossover Frequencies (-3 dB)
Narrow Frequency Response
Low Pass
Band Pass
High Pass
Wide Frequency Response
Low Pass
Band Pass
High Pass
Min
Typical
Max
Units
250
500
kΩ
0.1
V
VDDA-0.1
0.5
1.0 and 1.5
2.0
kHz
1.0
2.0 and 3.0
4.0
CONTROL OF ADC AND AUDIO SYNCHRONIZATION (1.65V ⤠VDDIO ⤠VDD1,2V) (unless otherwise noted)
The following table describes the controls required for audio synchronization.
GAIN_SEL[2:0]
SYNC_MODE
EN_AGC
EN_SYNC
INPUT_SEL[1:0]
Bits 7-5
Bit 4
Bit 3
Bit 2
Bits 1-0
Audio_sync_CTRL1 (2AH)
Input signal gain control. Range 0...21 dB, step 3 dB:
[000] = 0 dB (default) [011] = 9 dB
[110] = 18 dB
[001] = 3 dB
[100] = 12 dB
[111] = 21 dB
[010] = 6 dB
[101] = 15 dB
Synchronization mode selector.
SYNCMODE = 0 â Amplitude Mode (default)
SYNCMODE = 1 â Frequency Mode
Automatic Gain Control enable
1 = enabled
0 = disabled (Gain Select enabled) (default)
Audio synchronization enable
1 = Enabled
Note : If AGC is enabled, AGC gain starts from current GAIN_SEL gain value.
0 = Disabled (default)
[00] = Single ended input signal, ASE.
[01] = Not used
[10] = Not used
[11] = No input (default)
Copyright © 2007â2013, Texas Instruments Incorporated
Product Folder Links: LP3952
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