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Si473x-B20

14 Rev. 0.5

Table 9. WB Receiver Characteristics

= 2.7 to 5.5 V, VIO = 1.5 to 3.6V, T

= 25 °C)

Parameter Symbol Test Condition Min Typ Max Unit

Input Frequency

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

–3 dB — — 300 Hz

Audio Frequency Response High

–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

= 2.7 to 5.5 V, V

= 1.5 to 3.6 V, T

= –20 to 85 °C)

Parameter Symbol Test Condition Min Typ Max Unit

Reference Clock

RCLK Supported Frequencies

31.130 32.768 40,000 kHz

RCLK Frequency Tolerance

–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

–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.

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