SI4720-B20-GMR Datasheet, PDF (18/48 Pages) Silicon Laboratories – BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS

Si4720/21-B20
Table 12. FM Receive Power Scan Characteristics¹
(V_DD = 2.7 to 5.5 V, V_IO = 1.5 to 3.6 V, T_A = –20 to 85 °C, F_RF = 76–108 MHz)
Parameter
Symbol Test Condition Min Typ Max Unit
Tune and Signal Strength Measurement
Time per Channel²
—
—
80
ms
Notes:
1. Settling time for ac coupling capacitors on the audio input pins after Receive to Transmit transition can take a few
hundred milliseconds. The actual settling time depends on the values of the ac-coupling capacitors. Using digital audio
input mode avoids this settling time.
2. Guaranteed by characterization.
Table 13. Reference Clock and Crystal Characteristics
(V_DD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, T_A = –20 to 85 °C)
Parameter
Symbol Test Condition
RCLK Supported Frequencies¹
RCLK Frequency Tolerance²
Reference Clock
REFCLK_PRESCALE
Min
Typ
Max
Unit
31.130 32.768 40,000 kHz
–50
—
50
ppm
1
—
4095
REFCLK
31.130 32.768 34.406 kHz
Crystal Oscillator
Crystal Oscillator Frequency
Crystal Frequency Tolerance²
—
32.768
—
kHz
–100
—
100
ppm
Board Capacitance
—
—
3.5
pF
Notes:
1. The Si4720/21 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: Si4704/05/06/1x/2x/3x/4x FM
Transmitter/AM/FM/SW/LW/WB Receiver Programming Guide” for more details.
2. A frequency tolerance of ±50 ppm is required for FM seek/tune using 50 kHz channel spacing.
18
Rev. 1.0