Si4710/11-B30
12
Rev. 1.1
Table 9. FM Transmitter Characteristics
1
(Test conditions: V
RF
= 118 dB礦, stereo, Df = 68.25 kHz, Dfpilot = 6.75 kHz, REFCLK = 32.768 kHz, 75 祍 pre-emphasis,
unless otherwise specified.
Production test conditions: V
DD
= 3.3 V, V
IO
= 3.3 V, T
A
= 25 癈, F
RF
= 98 MHz.
Characterization test conditions: V
DD
= 2.7 to 5.5 V, V
IO
= 1.5 to 3.6 V, T
A
= 20 to 85 癈, F
RF
= 76108 MHz.
All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
Typical values apply at V
DD
= 3.3 V and 25 癈 unless otherwise stated.
Parameters are tested in production unless otherwise specified.)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Transmit Frequency Range
2
f
RF
76
108
MHz
Transmit Frequency Accuracy and
Stability
2,3
3.5
3.5
kHz
Transmit Voltage Accuracy
2
V
RF
= 103117 dB礦
2.5
2.5
dB
Transmit Voltage Accuracy
V
RF
= 102, 118 dB礦
2.5
2.5
dB
Transmit Voltage Temperature
Coefficient
2
0.075
0.025 dB/篊
Transmit Channel Edge Power
> ?00 kHz,
pre-emphasis off
20
dBc
Transmit Adjacent Channel Power
> ?00 kHz,
pre-emphasis off
30
26
dBc
Transmit Alternate Channel Power
> ?00 kHz,
pre-emphasis off
30
26
dBc
Transmit Emissions
In-band (76108 MHz)
30
dBc
Output Capacitance Max
2
C
tune
53
pF
Output Capacitance Min
2
C
tune
5
pF
Pre-emphasis Time Constant
2
TX_PREMPHASIS = 75 祍 70
75
80
祍
TX_PREMPHASIS = 50 祍 45
50
54
祍
Audio SNR Mono
2
Df = 22.5 kHz, Mono,
limiter off
58
63
dB
Audio SNR Stereo
Df = 22.5 kHz,
Dfpilot = 6.75 kHz, Stereo,
limiter off
53
58
dB
Audio THD Mono
Df = 75 kHz, Mono,
limiter off
0.1
0.5
%
Audio THD Stereo
2
Df = 22.5 kHz,
Dfpilot = 6.75 kHz, Stereo,
limiter off
0.1
0.5
%
Audio Stereo Separation
2
left channel only
30
35
dB
Notes:
1. FM transmitter performance specifications are subject to adherence to Silicon Laboratories guidelines in AN383:
Universal Antenna Selection and Layout Guidelines. Silicon Laboratories will evaluate schematics and layouts for
qualified customers. Tested with test schematic (L = 120 nH, Q >
30) shown in Figure 9 on page 14.
2. Guaranteed by characterization.
3. No measurable DfRF/DV
DD
at DV
DD
of 500 mVpk-pk at 100 Hz to 10 kHz.
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