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SI4736-C40 Datasheet, PDF (16/42 Pages) Silicon Laboratories – BROADCAST AM/FM RADIO RECEIVER | |||
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Si4736/37/38/39-C40
Table 12. AM Receiver Characteristics1,2 (Continued)
(VDD = 2.7 to 5.5 V, VIO = 1.85 to 3.6 V, TA = â20 to 85 °C)
Antenna Inductance6,9
Powerup Time6
From powerdown
180 â 450
µH
â
â 110
ms
Notes:
1. Additional testing information is available in âAN388: Si470x/1x/2x/3x/4x Evaluation Board Test Procedure.â
Volume = maximum for all tests. Tested at RF = 520 kHz.
2. To ensure proper operation and receiver performance, follow the guidelines in âAN383: Si47xx Antenna, Schematic,
Layout, and Design Guidelines.â 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. BAF = 300 Hz to 15 kHz, A-weighted.
6. Guaranteed by characterization.
7. See âAN388: Si470x/1x/2x/3x/4x Evaluation Board Test Procedureâ for evaluation method.
8. VIN = 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
(VDD = 2.7 to 5.5 V, VIO = 1.85 to 3.6 V, TA = â20 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
â50
â
50
ppm
1
â
4095
REFCLK
31.130 32.768 34.406 kHz
Crystal Oscillator Frequency
Crystal Frequency Tolerance2
Board Capacitance
Crystal Oscillator
â
32.768
â
kHz
â50
â
50
ppm
â
â
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 âAN332: Si47xx
Programming Guideâ.
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
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