SI4707-B20 Datasheet, PDF (11/30 Pages) Silicon Laboratories – WEATHER BAND AND SAME DATA RECEIVER

Si4707-B20
Table 8. WB Receiver Characteristics¹
(V_DD = 2.7 to 5.5 V, V_IO = 1.5 to 3.6V, T_A = 25 °C)
Parameter
Symbol
Test Condition
Min Typ Max Unit
Input Frequency
Sensitivity^2,3,4
Adjacent Channel Selectivity
Audio S/N^2,3,4,5
Audio Frequency Reponse Low
Audio Frequency Reponse High
AFSK Trip Sensitivity⁶
f_R
162.4 — 162.55 MHz
SINAD = 12 dB
—
0.45
— µV EMF
±25 kHz
—
55
—
dB
—
45
—
dB
–3 dB
—
—
300
Hz
–3 dB
3
—
—
kHz
100% of message
—
0.45
— µV EMF
correctly received
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. B_AF = 300 Hz to 15 kHz, A-weighted.
5. V_EMF = 1 mV.
6. f = 4 kHz.
Table 9. 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
RCLK Supported Frequency^*
Reference Clock
RCLK Frequency Tolerance
REFCLK_PRESCALE
Min
Typ
Max
Unit
31.130 32.768 40,000.0 kHz
–50
—
50
ppm
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
*Note: The Si4707 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, Table 6 for more details.
Rev. 0.8
11