BCM4319XKUBGT Datasheet, PDF (22/84 Pages) Cypress Semiconductor – Single-Chip IEEE 802.11™ a/b/g/n MAC/Baseband/ Radio with Integrated SDIO and USB Interfaces

BCM4319 Preliminary Data Sheet
Crystal Oscillator
Table 1: Crystal Oscillator and External Frequency Reference Specifications (Cont.)
Crystal
External Frequency
Reference
Parameter
Condition ^a
Min Typ Max Min Typ Max Unit
Phase noise
requirements ^{e f}
Jitter
For 30 MHz clock
For 30 MHz clock
For 30 MHz clock
For 30 MHz clock
From1 kHz to 1 MHz
–
N/A –
–
–130^{g –}
dBc/Hz
–
N/A –
–
–140^{f –}
dBc/Hz
–
N/A –
–
–145^{f –}
dBc/Hz
–
N/A –
–
–150^{f –}
dBc/Hz
–
N/A –
–
–
< 0.33 ps
a. The supported crystal/external reference frequencies for SDIO mode are 12 MHz to 52 MHz (26 or 30 MHz is
recommended). For USB mode, only 30 MHz is supported.
b. Frequency programmable between 12 MHz and 52 MHz, in 2 ppm steps. The step size (resolution) is
approximately 80 Hz.
c. Exact value of load capacitance to center the frequency tolerance depends on board layout; see Broadcom
reference schematics.
d. Initial + over temperature + aging.
e. If the input signal amplitude is below 800 mV p-p, contact your Broadcom representative for applications
assistance.
f. For a clock reference other than 30 MHz, these limits must be scaled by 20*log10( f / 30 ) dB, where f = the
reference clock frequency in MHz.
g. For 5 GHz, 11n (both the 20 and 40 MHz channels): covers all other modes of operation.
Crystal Oscillator
The BCM4319 can use an external crystal to provide a frequency reference. The recommended configuration
for the crystal oscillator including all external components is shown in Table 5 on page 22. Refer to the reference
board schematics for exact details.
Broadcom^®
April 2, 2014 • 4319-DS05-R
Single-Chip IEEE 802.11™ a/b/g/n MAC/Baseband/Radio
Page 21