SI4736-C40-GUR Datasheet, PDF (16/42 Pages) Silicon Laboratories – BROADCAST AM/FM RADIO RECEIVER

Si4736/37/38/39-C40
Table 12. AM Receiver Characteristics^{1,2 (Continued)}
(V_DD = 2.7 to 5.5 V, V_IO = 1.85 to 3.6 V, TA = –20 to 85 °C)
Antenna Inductance^6,9
Powerup Time⁶
From powerdown
180 — 450
µH
—
— 110
ms
Notes:
1. Additional testing information is available in “AN388: Si470x/1x/2x/3x/4x Evaluation Board Test Procedure.”
Volume = maximum for all tests. Tested at RF = 520 kHz.
2. 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.
3. FMOD = 1 kHz, 30% modulation, 2 kHz channel filter.
4. Analog audio output mode.
5. B_AF = 300 Hz to 15 kHz, A-weighted.
6. Guaranteed by characterization.
7. See “AN388: Si470x/1x/2x/3x/4x Evaluation Board Test Procedure” for evaluation method.
8. V_IN = 5 mVrms.
9. Stray capacitance on antenna and board must be < 10 pF to achieve full tuning range at higher inductance levels.
Table 13. Reference Clock and Crystal Characteristics
(V_DD = 2.7 to 5.5 V, V_IO = 1.85 to 3.6 V, T_A = –20 to 85 °C)
Parameter
RCLK Supported Frequencies¹
RCLK Frequency Tolerance²
REFCLK_PRESCALE
Symbol Test Condition
Reference Clock
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 Frequency
Crystal Frequency Tolerance²
Board Capacitance
Crystal Oscillator
—
32.768
—
kHz
–50
—
50
ppm
—
—
3.5
pF
Notes:
1. The Si4736/37/38/39 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. For more details, see Table 6 of “AN332: Si47xx
Programming Guide”.
2. A frequency tolerance of ±50 ppm is required for FM seek/tune using 50 kHz channel spacing and WB tune.
16
Rev. 1.0