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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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STA335BWS Arkusz danych(PDF) 62 Page - STMicroelectronics |
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STA335BWS Arkusz danych(HTML) 62 Page - STMicroelectronics |
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62 / 68 page  Application STA335BWS 62/68 7 Application 7.1 Application schematic and power supplies Figure 17 shows a circuit diagram of a typical application for STA335BWS. Particular care has to be given to the layout of the PCB, especially the power supplies. The 3.3 Ω resistors on the digital supplies (VDD_DIG) have to be placed as close as possible to the device. This helps to prevent unwanted oscillation on the digital portion of the device due to inductive tracks of the PCB. This same rule is also be applied to all the decoupling capacitors in order to limit any kind of spikes on all the supplies. Figure 17. Application schematic 7.2 PLL filter schematic It is recommended to use the below scheme and values for the PLL loop filter to achieve the best performances from the device in general application. Please be noted that the ground of this filter scheme has to be connected to the ground of the PLL without any resistive path. Concerning the component values, please take into account that the greater is the filter bandwidth, the less is the lock time but the higher is the PLL output jitter. 100nF 1000uF 35V 1nF SCL SDA RESET VCC RESET 100nF TW EAPD 3V3 1uF 35V 100nF 100nF 1uF 35V INTL 100nF 100nF 3V3 3V3 3R3 DDX3B DDX3A 3R3 LRCKI PWDN 3V3 OUT2B XTI BICKI OUT2A GND_SUB 1 SA 2 TEST_MODE 3 VSS 4 VCC_REG 5 OUT2B 6 GND2 7 VCC2 8 OUT2A 9 OUT1B 10 VCC1 11 GND1 12 OUT1A 13 GND_REG 14 VDD 15 CONFIG 16 DDX3B 17 DDX3A 18 EAPD/4B 19 TWARN/4A 20 VDD_DIG 21 GND_DIG 22 PWRDN 23 VDD_PLL 24 FILTER_PLL 25 PLL_GND 26 XTI 27 BICKI 28 LRCKI 29 SDI 30 RESET 31 INT_LINE 32 SDA 33 SCL 34 GND_DIG 35 VDD_DIG 36 OUT1B DATA PLL_FILT OUT1A 10K 100nF 1000uF 35V 1nF SCL SDA RESET VCC RESET 100nF 100nF OUT2A GND_SUB 1 SA 2 TEST_MODE 3 VSS 4 VCC_REG 5 OUT2B 6 GND2 7 VCC2 8 OUT2A 9 OUT1B 10 VCC1 11 GND1 12 OUT1A 13 GND_REG 14 VDD 15 CONFIG 16 DDX3B 17 DDX3A 18 EAPD/4B 19 TWARN/4A 20 VDD_DIG 21 GND_DIG 22 PWRDN 23 VDD_PLL 24 FILTER_PLL 25 PLL_GND 26 XTI 27 BICKI 28 LRCKI 29 SDI 30 RESET 31 INT_LINE 32 SDA 33 SCL 34 GND_DIG 35 VDD_DIG 36 OUT1B DATA PLL_FILT OUT1A 10K BEAD BEAD PLL_GND GND_DIG GND_DIG GND_DIG GND_DIG 100nF 1000uF 35V 1nF SCL SDA RESET VCC RESET 100nF TW EAPD 3V3 1uF 35V 100nF 100nF 1uF 35V INTL 100nF 100nF 3V3 3V3 3R3 DDX3B DDX3A 3R3 LRCKI PWDN 3V3 OUT2B XTI BICKI OUT2A GND_SUB 1 SA 2 TEST_MODE 3 VSS 4 VCC_REG 5 OUT2B 6 GND2 7 VCC2 8 OUT2A 9 OUT1B 10 VCC1 11 GND1 12 OUT1A 13 GND_REG 14 VDD 15 CONFIG 16 DDX3B 17 DDX3A 18 EAPD/4B 19 TWARN/4A 20 VDD_DIG 21 GND_DIG 22 PWRDN 23 VDD_PLL 24 FILTER_PLL 25 PLL_GND 26 XTI 27 BICKI 28 LRCKI 29 SDI 30 RESET 31 INT_LINE 32 SDA 33 SCL 34 GND_DIG 35 VDD_DIG 36 OUT1B DATA PLL_FILT OUT1A 10K 100nF 1000uF 35V 1nF SCL SDA RESET VCC RESET 100nF 100nF OUT2A GND_SUB 1 SA 2 TEST_MODE 3 VSS 4 VCC_REG 5 OUT2B 6 GND2 7 VCC2 8 OUT2A 9 OUT1B 10 VCC1 11 GND1 12 OUT1A 13 GND_REG 14 VDD 15 CONFIG 16 DDX3B 17 DDX3A 18 EAPD/4B 19 TWARN/4A 20 VDD_DIG 21 GND_DIG 22 PWRDN 23 VDD_PLL 24 FILTER_PLL 25 PLL_GND 26 XTI 27 BICKI 28 LRCKI 29 SDI 30 RESET 31 INT_LINE 32 SDA 33 SCL 34 GND_DIG 35 VDD_DIG 36 OUT1B DATA PLL_FILT OUT1A 10K BEAD BEAD BEAD PLL_GND GND_DIG GND_DIG GND_DIG GND_DIG |
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