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LP3954TL/NOPB Datasheet(PDF) 41 Page - Texas Instruments |
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LP3954TL/NOPB Datasheet(HTML) 41 Page - Texas Instruments |
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41 / 60 page  MCU WLED1 WLED2 WLED3 WLED4 WLED5 WLED6 R1 G1 B1 R2 G2 B2 FLASH_EN FLASH IRGB IRT ASE IFLASH SW BATTERY FB VDDA VREF D1 VDD2 VDD1 GNDS SCK/SCL SI SS/SDA SO SYNC/PWM IF_SEL VDDIO VBAT AUDIO COUT 10 éF L1 4.7 éH CIN 10 éF CVDD1 100 nF IMAX = 300...400 mA VOUT = 4...5.3V CVDDA 1 é F CREF 100 nF RRGB RRT CVDDIO 100 nF + - + - VDDA R3 100k R4 100k R1 10k R2 100k C2 10 nF C1 100 nF LMV321 LP3954 www.ti.com SNVS340D – JUNE 2005 – REVISED MARCH 2013 EXAMPLE 4 • MAIN BACKLIGHT • SUB BACKLIGHT • AUDIO SYNCHRONIZED FUNLIGHTS • RGB INDICATION LIGHT There may be cases where the audio input signal going into the LP3954 is too weak for audio synchronization. This figure presents a single-supply inverting amplifier connected to the ASE input for audio signal amplification. The amplification is +20 dB, which is well enough for 20 mVp-p audio signal. Because the amplifier (LMV321) is operating in single supply voltage, a voltage divider using R3 and R4 is implemented to bias the amplifier so the input signal is within the input common-mode voltage range of the amplifier. The capacitor C1 is placed between the inverting input and resistor R1 to block the DC signal going into the audio signal source. The values of R1 and C1 affect the cutoff frequency, fc = 1/(2*Pi*R1*C1), in this case it is around 160 Hz. As a result, the LMV321 output signal is centered around mid-supply, that is VDDA/2. The output can swing to both rails, maximizing the signal-to-noise ratio in a low voltage system Figure 46. Using Extra Amplifier Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 41 Product Folder Links: LP3954 |
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