BCM4339XKWBGT Datasheet, PDF (33/183 Pages) Cypress Semiconductor – Single-Chip 5G WiFi IEEE 802.11ac MAC/Baseband/Radio with Integrated Bluetooth 4.1 and FM Receiver

BCM4339 Preliminary Data Sheet
External Frequency Reference
Table 2: Crystal Oscillator and External Clock—Requirements and Performance (Cont.)
Crystal^a
External Frequency
Reference^{b c}
Parameter
Conditions/Notes
Min. Typ. Max. Min. Typ. Max. Units
WRF_XTAL_IN
input high level
DC-coupled digital signal
–
–
–
1.0 –
1.26 V
WRF_XTAL_IN
input voltage
(see Figure 5)
AC-coupled analog signal
–
–
–
1000 –
1200 mV_p-p
Duty cycle
37.4 MHz clock
–
–
–
40 50 60 %
Phase noise^f
37.4 MHz clock at 10 kHz offset –
–
–
–
–
–129 dBc/Hz
(IEEE 802.11b/g) ^{37.4 MHz clock at 100 kHz offset –}
–
–
–
–
–136 dBc/Hz
Phase noise^f
(IEEE 802.11a)
37.4 MHz clock at 10 kHz offset –
–
–
–
–
–137 dBc/Hz
37.4 MHz clock at 100 kHz offset –
–
–
–
–
–144 dBc/Hz
Phase noise^f
(IEEE 802.11n,
2.4 GHz)
37.4 MHz clock at 10 kHz offset –
–
–
–
–
–134 dBc/Hz
37.4 MHz clock at 100 kHz offset –
–
–
–
–
–141 dBc/Hz
Phase noise^f
(IEEE 802.11n,
5 GHz)
37.4 MHz clock at 10 kHz offset –
–
–
–
–
–142 dBc/Hz
37.4 MHz clock at 100 kHz offset –
–
–
–
–
–149 dBc/Hz
Phase noise^f
37.4 MHz clock at 10 kHz offset –
–
–
–
–
–148 dBc/Hz
(IEEE 802.11ac,
37.4 MHz clock at 100 kHz offset –
–
–
–
–
–155 dBc/Hz
5 GHz)
a. (Crystal) Use WRF_XTAL_IN and WRF_XTAL_OUT.
b. See “External Frequency Reference” on page 31 for alternative connection methods.
c. For a clock reference other than 37.4 MHz, 20 × log10(f/37.4) dB should be added to the limits, where f = the
reference clock frequency in MHz.
d. The frequency step size is approximately 80 Hz.
e. It is the responsibility of the equipment designer to select oscillator components that comply with these
specifications.
f. Assumes that external clock has a flat phase-noise response above 100 kHz.
Broadcom^®
November 17, 2014 • 4339-DS106-R
Page 32