Si4708/09-B
10 Confidential Rev. 1.4
Table 7. FM Receiver Characteristics
1,2
(V
D
= V
A
= 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
3,4,5,6,7
(S+N)/N = 26 dB — 1.7 3.5 µVEMF
Sensitivity (50 matching
network)
3,4,5,6,8
(S+N)/N = 26 dB — 1.1 — µVEMF
RDS Sensitivity
8
f = 2 kHz,
RDS BLER < 5%
— 15 — µVEMF
LNA Input Resistance
8,9
345k
LNA Input Capacitance
8,9
456pF
Input IP3
8,10
104 106 — dBµVEMF
AM Suppression
3,4,5,8,9
m = 0.3 40 55 — dB
Adjacent Channel Selectivity ±200 kHz 35 50 — dB
Alternate Channel Selectivity ±400 kHz 60 70 — dB
Spurious Response Rejection
8
In-band 35 — — dB
RCLK Frequency — 32.768 — kHz
RCLK Frequency Tolerance
11
SPACE[1:0] = 00 or 01 –200 — 200 ppm
SPACE[1:0] = 10 –50 — 50
Audio Output Voltage
3,4,5,9
72 80 90 mV
RMS
Audio Output L/R Imbalance
3,4,9,12
—— 1 dB
Audio Frequency Response Low
8
–3 dB — — 30 Hz
Audio Frequency Response High
8
–3 dB 15 — — kHz
Audio Stereo Separation
3,9,12
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
=1mV.
10. |f
2
– f
1
| > 1 MHz, f
0
=2xf
1
– f
2
. 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).
