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SI4739-B20-GMR Datasheet(PDF) 11 Page - Silicon Laboratories |
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SI4739-B20-GMR Datasheet(HTML) 11 Page - Silicon Laboratories |
11 / 24 page Si473x-B20 Rev. 0.5 11 Table 7. FM Receiver Characteristics1,2 (VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C) Parameter Symbol Test Condition Min Typ Max Unit Input Frequency fRF 76 — 108 MHz Sensitivity with Headphone Network3,4,5 (S+N)/N = 26 dB — 2.2 3.5 µV EMF Sensitivity with 50 Network3,4,5,6 (S+N)/N = 26 dB — 1.1 — µV EMF RDS Sensitivity6 f = 2 kHz, RDS BLER < 5% —15— µV EMF LNA Input Resistance6,7 34 5 k LNA Input Capacitance6,7 45 6 pF Input IP36,8 100 105 — dBµV EMF AM Suppression3,4,6,7 m = 0.3 40 50 — dB Adjacent Channel Selectivity ±200 kHz 35 50 — dB Alternate Channel Selectivity ±400 kHz 60 70 — dB Spurious Response Rejection6 In-band 35 — — dB Audio Output Voltage3,4,7 72 80 90 mVRMS Audio Output L/R Imbalance3,7,9 —— 1 dB Audio Frequency Response Low6 –3 dB — — 30 Hz Audio Frequency Response High6 –3 dB 15 — — kHz Audio Stereo Separation7,9 25 — — dB Audio Mono S/N3,4,5,7,10 55 63 — dB Audio Stereo S/N4,5,7,10,11 —58— dB Audio THD3,7,9 —0.1 0.5 % De-emphasis Time Constant6 FM_DEEMPHASIS = 2 70 75 80 µs FM_DEEMPHASIS = 1 45 50 54 µs Audio Output Load Resistance6,10 RL Single-ended 10 — — k Audio Output Load Capacitance6,10 CL Single-ended — — 50 pF Notes: 1. Additional testing information is available in “AN388: Si470x/1x/2x/3x/4x Evaluation Test Board Procedure.” Volume = maximum for all tests. Tested at RF = 98.1 MHz. 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, 75 µs de-emphasis, MONO = enabled, and L = R unless noted otherwise. 4. f = 22.5 kHz. 5. BAF = 300 Hz to 15 kHz, A-weighted. 6. Guaranteed by characterization. 7. VEMF =1 mV. 8. |f2 – f1| > 2 MHz, f0 =2x f1 – f2. AGC is disabled. 9. f = 75 kHz. 10. At LOUT and ROUT pins. 11. Analog audio output mode. 12. At temperature (25°C). |
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