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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LC823450 датащи(PDF) 63 Page - ON Semiconductor |
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LC823450 датащи(HTML) 63 Page - ON Semiconductor |
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63 / 112 page  LC823450 www.onsemi.com 63 XTAL Characteristics Table 26. XTAL CHARACTERISTICS (VDD1 (Note 40) = 0.93 to 1.27 V, TA = −20°C to +65°C) Item Symbol condition VddXT1 = 0.93 to 1.1V VddXT1 = 1.1 to 1.3V Unit Min Typ Max Min Typ Max Frequency Fmax 1 20 1 50 MHz 40. Power up and power down timing of VddXT1 and Vdd1 should be as close as possible . Note that the oscillation frequency of XT1 that can be used with this product depends on the function used. Please refer to the following table. For example, only 48 MHz is available for USB Host function. Table 27. Function to be used Available frequency of XT1 (P means available) 12MHz 20MHz 24MHz 48MHz Other than the left USB Device x x x x USB Host x ROM boot x x x x (Note 41) 41. During ROM boot, some clock frequencies are determined based on the XTALINFO[1:0] input and the frequency of XT1 other than 12/20/24/48 MHz may cause functional error. However, because there is a possibility that the difference of the frequency is acceptable in some extent, please contact our representative if needed. The requirements of XT1 are below to use USB Host or USB Device function. • Frequency deviation： ±200 ppm or less • Jitter: ±50 ps or less XTALINFO[1:0] port should be set in accordance with the frequency of XT1. Some products which don’t have XTALINFO[1:0] port, select the appropriate products which set XTALINFO[1:0] internally in accordance with the frequency of XT1. (Regarding the product name, please contact our representative). 10bit ADC Converter Characteristic Table 28. 10BIT ADC CONVERTER CHARACTERISTIC (TA = 25°C, VDD1 = 1.2 V, AVDDADC = 3.0 V, FVIN = 1 kHz (Note 42)) Item Symbol Condition Min Typ Max Unit Pin Applied ADC Power−supply Voltage AVDH 2.7 − 3.6 V AVDDADC ADC GND Voltage AVDL 0 − − V AVSSADC ADC Reference Voltage High VRH AVDH × 3/4 − AVDH V VRH ADC Reference Voltage Low VRL AVssADC − AVDH × 1/4 V VRL Decoupling Capacity CREF 0.047 − − μF VR Analog Input Voltage AN VRL − VRH V AN[5:0] ADC Resolution BIT − − 10 Bit AN[5:0] Reference Resistance RR (Note 44) 7.3 9 10.7 k Ω VRH ,VRL ADC Conversion Frequency (Note 49) Fs − − 1000 KS/s ADC Operation Clock Frequency (Note 49) Fc (Note 45) 2 − 20 MHz (Note 46) 2 5 MHz Number of ADC Conversion Clocks (Note 49) Nc 12 − − 1/Fc Number of ADC Sample Holding Clocks (Note 49) Ns 2 − − 1/Fc ADC Sample Holding Time (Sampling Time) (Note 8) Tstc 1 − − μs |
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