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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP3950SL/NOPB датащи(PDF) 31 Page - Texas Instruments |
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LP3950SL/NOPB датащи(HTML) 31 Page - Texas Instruments |
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31 / 38 page  LP3950 VDD1 VDD2 VDDA CVDD1 CVDD2 CVDDA 100 nF 100 nF 100 nF = 2.7V TO 2.9V CIN 10 PF 4.7 PH L1 VIN D1 SW C110nF 100 nF ASE VDD = 3.0V TO 4.5V CVDD_IO VDD_IO SO AMODE COUT 10 PF FB R1 G1 B1 R2 RR2 RR3 RR1 RR5 GND1 GND2 GND3 GNDA GND_RGB GND_BOOST DME AD2 RT 82k CVREF 100 nF RT VREF AD1 IF_SEL RSO 100 k: MICROCONTROLLER NC NC VDDIO SCK SI SS NRST PWM_LED RR4 RB2 RB3 RB1 RG2 RG3 RG1 RR6 G2 RG4 RG5 RB4 RB5 B2 BACKLIGHT LEDS KEYPAD LEDS AUDIO SYNC. FUNLIGHT R1 10 k: + - R4 100 k: R2 100 k: R3 100 k: = 2.7V TO 2.9V VDD LMV321 C4 100 nF SINGE ENDED AUDIO SIGNAL LP3950 www.ti.com SNVS331C – NOVEMBER 2004 – REVISED APRIL 2013 Figure 34. Backlight and Keypad LEDs Controlled by the Pattern Generator Funlight LEDs Controlled by Audio Synchronization There may be cases where the audio input signal going into the LP3950 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 C4 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 C4 affect the cutoff frequency, fc = 1/(2*Pi*R1*C4), in this case it is around 160 Hz. As a result, the LMV321 output signal is centered around mid-supply, that is VDD/2. The output can swing to both rails, maximizing the signal-to-noise ratio in a low voltage system Copyright © 2004–2013, Texas Instruments Incorporated Submit Documentation Feedback 31 Product Folder Links: LP3950 |
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