BCM4330 Preliminary Data Sheet
TCXO
Table 2: Crystal Oscillator and External Clock – Requirements and Performance (Cont.)
External Frequency
Referenceb c
Crystala
Min Typ
Parameter
Conditions/Notes
Max Min Typ
Max Units
–128 dBc/Hz
Phase Noisef
37.4 MHz clock at 1 kHz offset
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
(802.11n, 5 GHz)
37.4 MHz clock at 10 kHz offset –
37.4 MHz clock at 100 kHz offset –
37.4 MHz clock at 1 MHz offset –
–138 dBc/Hz
–143 dBc/Hz
–148 dBc/Hz
a. (Crystal) Use WRF_XTAL_OP and WRF_XTAL_ON, internal power to pin WRF_XTAL_VDD1P2.
b. (TCXO) See “TCXO” on page 33 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. BT_TM6 should be tied low for a 52 MHz clock reference. For other frequencies, BT_TM6 should be tied high.
Note that 52 MHz is not an auto-detected frequency using the LPO clock.
e. The frequency step size is approximately 80 Hz resolution.
f. If the selected clock has a flat phase noise response above 100 kHz, that is, the phase noise at and above
100 kHz is constant, then subtract 1dB from all 1 kHz, 10 kHz, and 100 kHz values shown. For example, for the
2.4 GHz 802.11b/g values, the phase noise requirements change from –115, –125, and –130 dBc/Hz to
–116, –126, and –131 dBc/Hz respectively. Ignore the 1 MHz requirements when the phase noise is flat
above 100 kHz.
®
BROADCOM
BCM4330 Preliminary Data Sheet
April 28, 2011 • 4330-DS304-RI
Page 35
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