Si473x-B20
14 Rev. 0.5
Table 9. WB Receiver Characteristics
1
(V
DD
= 2.7 to 5.5 V, VIO = 1.5 to 3.6V, T
A
= 25 °C)
Parameter Symbol Test Condition Min Typ Max Unit
Input Frequency
f
R
162.4 — 162.55 MHz
Sensitivity
2,3
SINAD = 12 dB — 0.9 — µV EMF
Adjacent Channel Selectivity
±25 kHz — 52 — dB
Audio S/N
2,3,4,5
Mono — 45 — dB
Audio Frequency Response Low
6
–3 dB — — 300 Hz
Audio Frequency Response High
6
–3 dB 3 — — kHz
Notes:
1. 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.
2. F
MOD
= 1 kHz.
3. f = 3 kHz.
4. V
EMF
= 1 mV.
5. A-weighted.
6. Guaranteed by characterization
Table 10. Reference Clock and Crystal Characteristics
(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
Reference Clock
RCLK Supported Frequencies
1
31.130 32.768 40,000 kHz
RCLK Frequency Tolerance
2
–100 — 100 ppm
REFCLK_PRESCALE 1 — 4095
REFCLK 31.130 32.768 34.406 kHz
Crystal Oscillator
Crystal Oscillator Frequency — 32.768 — kHz
Crystal Frequency Tolerance
2
–50 — 50 ppm
Board Capacitance — — 3.5 pF
Notes:
1. The Si473x divides the RCLK input by REFCLK_PRESCALE to obtain REFCLK. There are some RCLK frequencies
between 31.130 kHz and 40 MHz that are not supported. See “AN332: Si47xx Programming Guide,” Table 6 for more
details.
2. A frequency tolerance of ±50 ppm is required for FM seek/tune using 50 kHz channel spacing, SW seek/tune, and WB
tune.
