BCM4330 Preliminary Data Sheet
TCXO
Table 2: Crystal Oscillator and External Clock – Requirements and Performance
External Frequency
Referenceb c
Crystala
Min Typ
Between 12 MHz and 52 MHzd,e
Parameter
Conditions/Notes
Max Min Typ
Max Units
Frequency
Crystal load
capacitance
–
–
–
12
–
–
–
–
pF
ESR
Drive level
Input impedance
(WRF_XTAL_OP)
–
–
–
30k
–
–
–
–
100k
–
–
–
–
60
200
–
7.5
–
–
–
30k
–
30k
–
–
–
100k
–
100k
–
–
–
–
–
7.5
–
Ω
µW
Ω
pF
Ω
pF
V
External crystal
Resistive
Capacitive
Resistive
Capacitive
DC-coupled digital signal
Input impedance
(WRF_TCXO_IN)
–
–
–
–
4
0.2
WRF_XTAL_OP
Input low level
0
WRF_XTAL_OP
Input high level
WRF_XTAL_OP
input voltage
(see Figure 6 on page
33)
DC-coupled digital signal
AC-coupled analog signal
–
–
–
–
–
–
1.0
–
–
1.36
V
400
1200 mVp-p
WRF_TCXO_IN
Input voltage
(see Figure 7 on page
33)
Frequency tolerance Without trimming
Initial + over
temperature
Duty cycle
Phase Noisef
(802.11b/g)
DC-coupled analog signal
–
–
–
–
400
–20
–
–
3300 mVp-p
–20
20
20
60
ppm
%
37.4 MHz clock
37.4 MHz clock at 1 kHz offset
37.4 MHz clock at 10 kHz offset –
37.4 MHz clock at 100 kHz offset –
37.4 MHz clock at 1 MHz offset –
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
40
–
–
–
–
–
–
–
–
–
–
–
–
50
–
–
–
–
–
–
–
–
–
–
–
–
–115 dBc/Hz
–125 dBc/Hz
–130 dBc/Hz
–135 dBc/Hz
–123 dBc/Hz
–133 dBc/Hz
–138 dBc/Hz
–143 dBc/Hz
–120 dBc/Hz
–130 dBc/Hz
–135 dBc/Hz
–140 dBc/Hz
Phase Noisef
(802.11a)
37.4 MHz clock at 1 kHz offset
–
37.4 MHz clock at 10 kHz offset –
37.4 MHz clock at 100 kHz offset –
37.4 MHz clock at 1 MHz offset –
Phase Noisef
(802.11n, 2.4 GHz)
37.4 MHz clock at 1 kHz offset
–
37.4 MHz clock at 10 kHz offset –
37.4 MHz clock at 100 kHz offset –
37.4 MHz clock at 1 MHz offset –
®
BROADCOM
BCM4330 Preliminary Data Sheet
April 28, 2011 • 4330-DS304-RI
Page 34
CYPRESS [ CYPRESS ]
