SI4708-C Datasheet, PDF (10/40 Pages) Silicon Laboratories – BROADCAST FM RADIO TUNER FOR PORTABLE APPLICATIONS

Si4708/09-C
Table 7. FM Receiver Characteristics^1,2
(V_D = V_A = 2.7 to 5.5 V, V_IO = 1.62 to 3.6 V, T_A = –20 to 85 °C)
Parameter
Symbol Test Condition
Min
Typ Max
Unit
Input Frequency
Sensitivity^3,4,5,6,7
f_RF
76
—
108
MHz
(S+N)/N = 26 dB
—
1.7
3.5 µVEMF
Sensitivity (50  matching
network)^3,4,5,6,8
RDS Sensitivity⁸
LNA Input Resistance^8,9
LNA Input Capacitance^8,9
Input IP3^8,10
AM Suppression^3,4,5,8,9
(S+N)/N = 26 dB
f = 2 kHz,
RDS BLER < 5%
m = 0.3
—
1.1
—
15
3
4
4
5
103 106
40
55
— µVEMF
— µVEMF
5
k
6
pF
— dBµVEMF
—
dB
Adjacent Channel Selectivity
±200 kHz
35
50
—
dB
Alternate Channel Selectivity
Spurious Response Rejection⁸
±400 kHz
In-band
60
70
—
dB
35
—
—
dB
RCLK Frequency
RCLK Frequency Tolerance¹¹
— 32.768 —
kHz
SPACE[1:0] = 00 or 01 –200
—
200
ppm
Audio Output Voltage^3,4,5,9
Audio Output L/R Imbalance^3,4,9,12
SPACE[1:0] = 10
–50
—
72
80
—
—
50
90
mV_RMS
1
dB
Audio Frequency Response Low⁸
Audio Frequency Response High⁸
Audio Stereo Separation^3,9,12
–3 dB
–3 dB
—
—
30
Hz
15
—
—
kHz
25
—
—
dB
Notes:
1. Additional testing information is available in Application Note AN388. Volume = maximum for all tests.
2. Important Note: To ensure proper operation and FM receiver performance, follow the guidelines in “AN350: Si4708/09
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
4. MONO = 1, and L = R unless noted otherwise.
5. f = 22.5 kHz.
6. B_AF = 300 Hz to 15 kHz, A-weighted.
7. Typical sensitivity with headphone matching network.
8. Guaranteed by characterization.
9. V_EMF = 1 mV.
10. |f₂ – f₁| > 1 MHz, f₀ = 2 x f₁ – f₂. AGC is disabled by setting AGCD = 1. Refer to "6. Register Descriptions" on page
20.
11. The channel spacing is selected with the SPACE[1:0] bits. Refer to "6. Register Descriptions" on page 20. Seek/Tune
timing is guaranteed for 100 and 200 kHz channel spacing. ±50 ppm PCLK tolerance required for 50 kHz channel
spacing.
12. f = 75 kHz.
13. The de-emphasis time constant is selected with the DE bit. Refer to "6. Register Descriptions" on page 20.
14. At LOUT and ROUT pins.
15. Do not enable STC interrupts before the powerup time is complete. If STC interrupts are enabled before the powerup
time is complete, an interrupt will be generated within the powerup interval when the initial default tune operation is
complete. See "AN349: Si4708/09 Programming Guide" for more information.
16. Minimum and maximum at room temperature (25 °C).
10
Rev. 1.2