SI4736-C40 Datasheet, PDF (14/42 Pages) Silicon Laboratories – BROADCAST AM/FM RADIO RECEIVER

Si4736/37/38/39-C40
Table 10. 64–75.9 MHz Input Frequency FM Receiver Characteristics^1,2,6
(V_DD = 2.7 to 5.5 V, V_IO = 1.85 to 3.6 V, T_A = –20 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Input Frequency
Sensitivity with Headphone Net-
work^3,4,5
LNA Input Resistance⁷
LNA Input Capacitance⁷
Input IP3⁸
f_RF
64
—
75.9
MHz
(S+N)/N = 26 dB
—
4.0
—
µV EMF
3
4
4
5
100
105
5
k
6
pF
— dBµV EMF
AM Suppression^3,4,7
m = 0.3
40
50
—
dB
Adjacent Channel Selectivity
±200 kHz
—
50
—
dB
Alternate Channel Selectivity
Audio Output Voltage^3,4,7
Audio Output L/R Imbalance^3,7,9
±400 kHz
—
70
—
dB
72
80
90
mV_RMS
—
—
1
dB
Audio Frequency Response Low
–3 dB
—
—
30
Hz
Audio Frequency Response High
Audio Mono S/N^3,4,5,7,10
Audio THD^3,7,9
–3 dB
15
—
—
kHz
55
63
—
dB
—
0.1
0.5
%
De-emphasis Time Constant
FM_DEEMPHASIS = 2 70
75
80
µs
FM_DEEMPHASIS = 1 45
50
54
µs
Audio Output Load Resistance¹⁰
R_L
Audio Output Load Capacitance¹⁰
C_L
Seek/Tune Time
Single-ended
10
—
—
k
Single-ended
—
—
50
pF
RCLK tolerance
—
—
60 ms/channel
= 100 ppm
Powerup Time
RSSI Offset¹¹
From powerdown
—
—
110
ms
Input levels of 8 and –3
—
3
dB
60 dBµV EMF
Notes:
1. Additional testing information is available in “AN388: Si470x/1x/2x/3x/4x Evaluation Board Test Procedure.”
Volume = maximum for all tests. Tested at RF = 98.1 MHz.
2. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Si47xx Antenna, Schematic,
Layout, and Design 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.
9. f = 75 kHz.
10. At L_OUT and R_OUT pins.
11. At temperature (25 °C).
14
Rev. 1.0