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AN2479 Datasheet(PDF) 11 Page - STMicroelectronics |
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AN2479 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 23 page AN2479 Design guidelines for PCB schematic and layout Doc ID 12956 Rev 2 11/23 Main filter The main filter is an L-C based Butterworth filter. The cutoff frequency must be chosen between the upper limit of the audio band (~ 20 kHz) and the carrier frequency (384 kHz). Figure 11. Main filter Figure 12. Recommended power-up and power-down sequence Table 2. Recommended values Rload 8 ohm 4 ohm Lload 22 µH 10 µH Cload 470 nF 1 µF C damp-S 100 nF 220 nF C damp-P 220 nF 220 nF R damp 6.2 2.7 Rload Cload Lload Lload INxA INxB Lload Rload 2 Π 2 * fcutoff * * ---------------- ----------------- = f cutoff 1 2 Π * 2 load Lload * * * ----------------------------------------------------------------------- = Cload 1 22 Π fcutoff Rload * * * ----------------------------------------------------------------- = C ---------------- - Don ’t care Don ’t care CMD0 CMD1 CMD2 VCC VDD_Di XTI Reset I2C PWD T T Don ’t care Don ’t care CMD0 CMD1 CMD2 VCC VDD_Di XTI Reset I2C PWD T T Don’t care TR = mimimum time between XTI master clock stable and Reset removal: 1 msec TC = minimum time between Reset removal and I2C program, sequence start: 1msec Note 1: clock stable means: fmax - fmin < 1 MHz Note 2: No specific VCC and VDD_Dig turn-on sequence is required |
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