BCM4330 Preliminary Data Sheet
FM Transmitter Specifications
Table 31: FM Transmitter Specifications (Cont.)
Conditions Min
Parameter
Typ
Max
Units
Transmitted spectrum for
maximum deviation
Total peak deviation set to 75 kHz. Audio –
tone of 1 kHz, pilot = 6.75 kHz.
–
–
–
0 kHz offset from carrier
± 50 kHz offset
± 75 kHz offset
± 120 kHz offset
± 100 kHz offset from nominal channel
freq
–
–
–
–
–
–
–
–
–
–
0
0
0
dBc
dBc
dBc
–12.2 dBc
–20
Occupied BW
dBc
Transmitter noise floor
From 850 MHz to 2.4 GHz
–
–
–
dBm/
Hz
kHz peak
Compositetransmitteddeviation L = R set to 75 mV rms, stereo enabled
–
–
–
–
–
–
–
–
± 75
–
19
12
Transmitter spurious
Load 120 nH: Q ≥ 30
–
746–764 MHz
869–894 MHz, 925–960 MHz, 1805–
1880 MHz, 1930–1990 MHz
dBuV
dBuV
2110–2170 MHz
1570–1580 MHz
Transmitted deviation flatness Change in audio level for 75 kHz
deviation over 76–108 MHz
–
–
–
–
–
–
20
6
±1
dBuV
dBuV
dB
Channel balance
1 kHz tone for 22.5 kHz audio deviation –1
L = R, pilot 6.75 kHz
1 kHz tone for 22.5 kHz audio deviation 27
L ≠ R, pilot 6.75 kHz
–
1
dB
dB
Hz
Stereo separation
40
–
b
Lower 3 dB point (measured with
receiver set to correct de-emphasis)
–
50
a
Upper 3 dB point
15
–
–
–
–
–
± 5
1
kHz
µs
µs
%
Pre-emphasis time constant
Distortion
High
75
50
–
Low
–
Tolerance
–
75 kHz total deviation including 6.75 kHz –
pilot, 1 kHz modulation rate
0.1
%
Transmitted S/N depends on the Deviation set to 22.5 kHz with 6.75 kHz –
60
–
dB
32.768 kHz sleep clock phase
noise performance
pilot deviation. Measured with 50 µS de-
emphasis and A-weighted filter. Forced
Mono
As above in Stereo
–
–
56
–
–
–60
dB
dBc
b
Audio spurious products
Δf = 22.5 kHz, fmod = 1 kHz,
de-emphasis = 50 µs, L = R, BAF = 300 Hz
to 15 kHz, fTX = 76 to 108 MHz
a. Relative to mean power in the band.
b. With respect to a 1 kHz tone.
®
BROADCOM
BCM4330 Preliminary Data Sheet
April 28, 2011 • 4330-DS304-RI
Page 127
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