SI4720 Datasheet, PDF (2/2 Pages) Silicon Laboratories – Broadcast FM Radio Transceiver for Portable Applications

Si4720/21
Broadcast FM Radio Transceiver for Portable Applications
Selected Electrical Specifications
Parameter
Symbol
Test Condition
Min Typ
Frequency Range
Sensitivity
f_RF
76
—
(S+N)/N = 26 dB
—
2.2
Input IP3
|f₂ – f₁| > 1 MHz; f₀ = 2 x f₁ – f₂ —
108
AGC disabled
Adjacent Channel Selectivity
±200 kHz
—
50
Alternate Channel Selectivity
±400 kHz
—
70
RX Audio Output Voltage
72
80
RX Audio Band Limits
±1.5 dB
30
—
RX Audio S/N
—
63
RX Audio THD
—
0.1
Programmable Transmit Output
Voltage, TXO (Maximum Voltage)
—
115
Programmable Transmit Output
Voltage, TXO (Minimum Voltage)
—
83
Transmit Voltage Stability
–1
—
Transmit Voltage Step
—
1
Transmit Channel Edge Power
—
—
Transmit Adjacent Channel Power
—
–30
Pre/de-emphasis Time Constant
FMPE[1:0] = 00
70
75
FMPE[1:0] = 01
45
50
TX Audio SNR
—
63
TX Audio THD
—
0.1
TX Audio Stereo Separation
30
35
TX Sub Carrier Rejection Ratio
SCR
—
–50
TX Audio Input Signal Level (0 dB)
V_AI
V_IO = 1.8 V
—
—
Pin Assignments
Package Information
Max
108
—
—
Unit
MHz
µV EMF
dBµV EMF
—
dB
—
dB
90
mVrms
15k
Hz
—
dB
—
%
—
dBµV
—
dBµV
1
dB
2
dB
–20
dBC
–26
dBC
80
us
54
us
—
dB
—
%
—
dB
–40
dB
0.636
V_pk
NC 1 ^{20 19 18 17} 16
FMI 2
15 RIN/DIO
RFGND 3
TXO 4
GND
PAD
14 LOUT/DFS
13 ROUTDIO
RST 5
12 GND
6 _{7 8 9 10} 11 VDD
Symbol
A
A1
b
c
D
D2
e
E
E2
Millimeters
Min
Nom
Max
0.50
0.55
0.60
0.00
0.02
0.05
0.18
0.25
0.30
0.27
0.32
0.37
3.00 BSC
1.60
1.70
1.80
0.50 BSC
3.00 BSC
1.60
1.70
1.80
Symbol
f
L
L1
aaa
bbb
ccc
ddd
eee
Millimeters
Min
Nom
Max
2.53 BSC
0.35
0.40
0.45
0.00
—
0.10
—
—
0.10
—
—
0.10
—
—
0.08
—
—
0.10
—
—
0.10
FM Transceiver
Copyright © 2007 by Silicon Laboratories
1.18.07
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