|
BCM88335L2CUBGT Datasheet, PDF (29/140 Pages) Cypress Semiconductor – Single-Chip 5G Wi-Fi IEEE 802.11ac MAC/Baseband/ Radio with Integrated Bluetooth 4.1 for Automotive Applications | |||
|
◁ |
BCM88335 Data Sheet
External Frequency Reference
Table 2: Crystal Oscillator and External ClockâRequirements and Performance (Cont.)
Crystala
External Frequency
Referenceb c
Parameter
Conditions/Notes
Min. Typ. Max. Min. Typ. Max. Units
WRF_XTAL_IN
input high level
DC-coupled digital signal
â
â
â
1.0 â
1.26 V
WRF_XTAL_IN
input voltage
(see Figure 5)
AC-coupled analog signal
â
â
â
1000 â
1200 mVp-p
Duty cycle
37.4 MHz clock
â
â
â
40 50 60 %
Phase noisef
37.4 MHz clock at 10 kHz offset â
â
â
â
â
â129 dBc/Hz
(IEEE 802.11b/g) 37.4 MHz clock at 100 kHz offset â
â
â
â
â
â136 dBc/Hz
Phase noisef
(IEEE 802.11a)
37.4 MHz clock at 10 kHz offset â
â
â
â
â
â137 dBc/Hz
37.4 MHz clock at 100 kHz offset â
â
â
â
â
â144 dBc/Hz
Phase noisef
(IEEE 802.11n,
2.4 GHz)
37.4 MHz clock at 10 kHz offset â
â
â
â
â
â134 dBc/Hz
37.4 MHz clock at 100 kHz offset â
â
â
â
â
â141 dBc/Hz
Phase noisef
(IEEE 802.11n,
5 GHz)
37.4 MHz clock at 10 kHz offset â
â
â
â
â
â142 dBc/Hz
37.4 MHz clock at 100 kHz offset â
â
â
â
â
â149 dBc/Hz
Phase noisef
37.4 MHz clock at 10 kHz offset â
â
â
â
â
â148 dBc/Hz
(IEEE 802.11ac,
37.4 MHz clock at 100 kHz offset â
â
â
â
â
â155 dBc/Hz
5 GHz)
a. (Crystal) Use WRF_XTAL_IN and WRF_XTAL_OUT.
b. See âExternal Frequency Referenceâ on page 27 for alternative connection methods.
c. For a clock reference other than 37.4 MHz, 20 Ã 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®
September 23, 2015 ⢠88335-DS100-R
BROADCOM CONFIDENTIAL
Page 28
|
▷ |