CC3200_15 Datasheet, PDF (39/71 Pages) Texas Instruments – CC3200 SimpleLink™ Wi-Fi® and Internet-of-Things Solution, a Single-Chip Wireless MCU

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CC3200
SWAS032F – JULY 2013 – REVISED FEBRUARY 2015
Table 4-5. External F_ref Clock Requirements (–40°C to +85°C) (continued)
Characteristics
Condition
Sym
Min
Typ
Max
Phase noise @ 40 MHz
@ 1 kHz
–125
@ 10 kHz
–138.5
@ 100 kHz
–143
Input impedance
Resistance
12
Capacitance
7
Unit
dBc/Hz
dBc/Hz
dBc/Hz
KΩ
pF
4.11.3.5 Input Clocks/Oscillators
Table 4-6 lists the RTC crystal requirements.
CHARACTERISTICS
Frequency
Frequency accuracy
Crystal ESR
Table 4-6. RTC Crystal Requirements
CONDITION
SYM
MIN
Initial + temp + aging
32.768 kHz, C1 = C2 = 10 pF
TYP
32.768
MAX
±150
70
Table 4-7 lists the external RTC digital clock requirements.
Table 4-7. External RTC Digital Clock Requirements
CHARACTERISTICS
Frequency
Frequency accuracy
(Initial + temp + aging)
Input transition time t_r/t_f (10% to 90%)
Frequency input duty cycle
Slow clock input voltage limits
CONDITION
Square wave, DC coupled
Input impedance
SYM
t_r/t_f
V_ih
V_il
MIN
TYP
32768
20
50
0.65 × V_IO
0
1
MAX
±150
100
80
V_IO
0.35 × V_IO
5
Table 4-8 lists the WLAN fast-clock crystal requirements.
CHARACTERISTICS
Frequency
Frequency accuracy
Crystal ESR
Table 4-8. WLAN Fast-Clock Crystal Requirements
CONDITION
SYM
MIN
TYP
40
Initial + temp + aging
40 MHz, C1 = C2 = 6.2 pF
40
50
MAX
±25
60
UNIT
kHz
ppm
kΩ
UNIT
Hz
ppm
ns
%
V
V peak
MΩ
pF
UNIT
MHz
ppm
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.
Parameter
Return loss
Table 4-9. WLAN Filter Requirements
Frequency (MHz)
Min
2412 to 2484
10
Requirements
Typ
Max
Units
dB
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Specifications
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