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CC3200 Datasheet(PDF) 39 Page - Texas Instruments |
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CC3200 Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 71 page ![]() CC3200 www.ti.com SWAS032F – JULY 2013 – REVISED FEBRUARY 2015 Table 4-5. External Fref Clock Requirements (–40°C to +85°C) (continued) Characteristics Condition Sym Min Typ Max Unit Phase noise @ 40 MHz @ 1 kHz –125 dBc/Hz @ 10 kHz –138.5 dBc/Hz @ 100 kHz –143 dBc/Hz Input impedance Resistance 12 K Ω Capacitance 7 pF 4.11.3.5 Input Clocks/Oscillators Table 4-6 lists the RTC crystal requirements. Table 4-6. RTC Crystal Requirements CHARACTERISTICS CONDITION SYM MIN TYP MAX UNIT Frequency 32.768 kHz Frequency accuracy Initial + temp + aging ±150 ppm Crystal ESR 32.768 kHz, C1 = C2 = 10 pF 70 k Ω Table 4-7 lists the external RTC digital clock requirements. Table 4-7. External RTC Digital Clock Requirements CHARACTERISTICS CONDITION SYM MIN TYP MAX UNIT Frequency 32768 Hz Frequency accuracy ±150 ppm (Initial + temp + aging) Input transition time tr/tf (10% to 90%) tr/tf 100 ns Frequency input duty cycle 20 50 80 % Slow clock input voltage limits Square wave, DC coupled Vih 0.65 × VIO VIO V Vil 0 0.35 × VIO V peak Input impedance 1 M Ω 5 pF Table 4-8 lists the WLAN fast-clock crystal requirements. Table 4-8. WLAN Fast-Clock Crystal Requirements CHARACTERISTICS CONDITION SYM MIN TYP MAX UNIT Frequency 40 MHz Frequency accuracy Initial + temp + aging ±25 ppm Crystal ESR 40 MHz, C1 = C2 = 6.2 pF 40 50 60 Ohm 4.11.3.6 WLAN Filter Requirements The device requires an external bandpass filter to meet the various emission standards, including FCC. Table 4- 9 presents the attenuation requirements for the bandpass filter. TI recommends using the same filter used in the reference design to ease the process of certification. Table 4-9. WLAN Filter Requirements Requirements Parameter Frequency (MHz) Min Typ Max Units Return loss 2412 to 2484 10 dB Copyright © 2013–2015, Texas Instruments Incorporated Specifications 39 Submit Documentation Feedback Product Folder Links: CC3200 |
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