SI4720-B20-GMR Datasheet, PDF (13/48 Pages) Silicon Laboratories – BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS

Si4720/21-B20
Table 9. FM Receiver Characteristics^1,2
(V_DD = 2.7 to 5.5 V, V_IO = 1.5 to 3.6 V, T_A = –20 to 85 °C)
Parameter
Symbol
Test Condition
Min Typ Max
Unit
Input Frequency
f_RF
76
—
108
MHz
Sensitivity with Headphone Net-
work^3,4,5
Sensitivity with 50  Network^3,4,5,6
(S+N)/N = 26 dB
(S+N)/N = 26 dB
—
2.2
3.5 µV EMF
—
1.1
— µV EMF
RDS Sensitivity⁶
f = 2 kHz,
RDS BLER < 5%
—
15
— µV EMF
TXO Receiver Mode Sensitivity⁶
—
3.5
— µV EMF
LNA Input Resistance^6,7
3
4
5
k
LNA Input Capacitance^6,7
4
5
6
pF
Input IP3^6,8
100 105
— dBµV EMF
AM Suppression^3,4,6,7
m = 0.3
40
50
—
dB
Adjacent Channel Selectivity
±200 kHz
35
50
—
dB
Alternate Channel Selectivity
±400 kHz
60
70
—
dB
Spurious Response Rejection⁶
In-band
35
—
—
dB
Audio Output Voltage^3,4,7
Audio Output L/R Imbalance^3,7,9
72
80
90
mV_RMS
—
—
1
dB
Audio Frequency Response Low⁶
–3 dB
—
—
30
Hz
Audio Frequency Response High⁶
–3 dB
15
—
—
kHz
Audio Stereo Separation^7,9
25
—
—
dB
Audio Mono S/N^3,4,5,7,10
55
63
—
dB
Audio Stereo S/N^4,5,7,10,11
—
58
—
dB
Audio THD^3,7,9
De-emphasis Time Constant⁶
—
0.1
0.5
%
FM_DEEMPHASIS = 2 70
75
80
µs
FM_DEEMPHASIS = 1 45
50
54
µs
Audio Output Load Resistance^6,10
R_L
Single-ended
10
—
—
k
Notes:
1. Additional testing information is available in Application Note AN388. Volume = maximum for all tests. Tested at
RF = 98.1 MHz.
2. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and
Universal Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.
3. F_MOD = 1 kHz, 75 µs de-emphasis, MONO = enabled, and L = R unless noted otherwise.
4. f = 22.5 kHz.
5. B_AF = 300 Hz to 15 kHz, A-weighted.
6. Guaranteed by characterization.
7. V_EMF = 1 mV.
8. |f₂ – f₁| > 2 MHz, f₀ = 2 x f₁ – f₂. AGC is disabled. Refer to "7. Pin Descriptions: Si4720/21-GM" on page 41.
9. f = 75 kHz.
10. At L_OUT and R_OUT pins.
11. Analog audio output mode.
12. At temperature 25 °C.
Rev. 1.0
13