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SI4720-B20 Datasheet, PDF (16/48 Pages) Silicon Laboratories – BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS | |||
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Si4720/21-B20
Table 10. FM Transmitter Characteristics1 (Continued)
Test conditions: VRF = 118 dBµV, stereo, ïf = 68.25 kHz, ïfpilot = 6.75 kHz, REFCLK = 32.768 kHz, 75 µs pre-emphasis,
unless otherwise specified.
Production test conditions: VDD = 3.3 V, VIO = 3.3 V, TA = 25 °C, FRF = 98 MHz.
Characterization test conditions: VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = â20 to 85 °C, FRF = 76â108 MHz.
All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
Typical values apply at VDD = 3.3 V and 25 °C unless otherwise stated.
Parameters are tested in production unless otherwise specified.
Parameter
Audio THD Stereo2
Audio Stereo Separation2
Symbol
Test Condition
Min Typ Max Unit
ïf = 22.5 kHz,
â
0.1 0.5
%
ïfpilot = 6.75 kHz, Stereo,
limiter off
left channel only
30
35
â
dB
Sub Carrier Rejection Ratio
Powerup Settling Time2
Input Signal Level2
Frequency Flatness2
High Pass Corner Frequency2
Low Pass Corner Frequency2
SCR
40
50
â
dB
â
â
110
ms
VAI
â
Mono, ±1.5 dB,
30
ïf = 75 kHz, 0, 50, 75 µs
pre-emphasis, limiter off
â 0.636 VPK
â 15 k
Hz
Mono, â3 dB, ïf = 75 kHz, 5
â
30
Hz
0, 50, 75 µs pre-emphasis,
limiter off
Mono, â3 dB, ïf = 75 kHz, 15 k â 16 k
Hz
0, 50, 75 µs pre-emphasis,
limiter off
Audio Imbalance
Pilot Modulation Rate Accuracy2
Audio Modulation Rate Accuracy2
Input Resistance2
Input Capacitance2
Mono
â1
â
1
dB
ïf = 68.25 kHz,
â10 â
10
%
ïfpilot = 6.75 kHz, Stereo
ïf = 68.25 kHz,
â10 â
10
%
ïfpilot = 6.75 kHz, Stereo
LIATTEN[1:0] = 11
50
60
â
kï
â
10
â
pF
Received Noise Level Accuracy
(Si4720/21 Only)2
60 dBµV input, TA = 25 ºC â
54
â
dBuV
Notes:
1. FM transmitter performance specifications are subject to adherence to Silicon Laboratories guidelines in âAN383:
Universal Antenna Selection and Layout Guidelines.â Silicon Laboratories will evaluate schematics and layouts for
qualified customers. Tested with test schematic (L = 120 nH, Q > 30) shown in Figure 10 on page 19.
2. Guaranteed by characterization.
3. No measurable ïfRF/ïVDD at ïVDD of 500 mVpk-pk at 100 Hz to 10 kHz.
16
Rev. 1.0
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