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STV224X 数据表(PDF) 29 Page - STMicroelectronics |
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STV224X 数据表(HTML) 29 Page - STMicroelectronics |
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29 / 86 page  STV224XH/228XH/223XH - ELECTRICAL CHARACTERISTICS 29/86 4.4.7 SIF Amplifier Note 5: L standard Sc/Pc = -10 dB, Nyquist Pc = -6 dB, SIF input -4 dB with PIF input = 84 µV, BG standard Sc/Pc = - 13 dB, Nyquist Pc = -6 dB, SIF input -7 dB with PIF input = 85 µV. Note 6: This parameter is not tested during production. It is tested on the validation bench during the qualification phase. 4.4.8 SIF AGC (FM) 4.4.9 SIF AGC (AM) 4.4.10 FM Demodulator Electrical parameter valid in both QSS and Intercarrier modes, unless otherwise specified. 4.4.11 De-emphasis Symbol Parameter Test Conditions Min. Typ. Max. Unit VINSIF SIF Input Sensitivity - 3dB at AM/FMOUT Pin (see Note 5) AM output amplitude, FM subcarrier amplitude 55 40 µVRMS GRSIF Gain Control Range - 3dB to +1dB at AM/FMOUT Pin 60 dB CINSIF Differential Input Capacitance SIF Inputs (see Note 6) 1.5 2 2.5 pF RINSIF Differential Input Resistance SIF Inputs 1.5 2 2.5 k W Symbol Parameter Test Conditions Min. Typ. Max. Unit IC Charging Current 2.4 mA ID Discharging Current 100 µA Symbol Parameter Test Conditions Min. Typ. Max. Unit INORMAL Charging/Discharging Current Normal time constant ±6 µA IFAST Charging/Discharging Current Fast time constant ±2.4 mA Symbol Parameter Test Conditions Min. Typ. Max. Unit SIFMin Min. Broadcast Sound/Video Carri- er Ratio Intercarrier mode: SAW filter K2955M at SNR 35 dB -30 dB VOAF FM Audio Output Amplitude at AM/ FMOUT Pin FM dev = ±27 kHz BGDKI FM dev = ±13.5 kHz MN 400 500 630 mVRMS DFMX _norm Maximum FM Deviation THD < 10%, normal audio mode, AF = 1 kHz 200 kHz DFMX _w_qss Maximum FM Deviation QSS mode, Audio FM Wide mode (reg 04h, d3d2 = 11), AF = 1 kHz 400 kHz THD_FM Total Harmonic Distortion FM dev = ±27 kHz BGDKI 0.3 1 % S/N Audio S/N Weighted according to CCIR468-4 Quasi-Peak 55 dB AMR Amplitude Modulation Rejection m = 30%, AF = 1 kHz 32 dB SVR Supply Voltage Rejection See Note 4 45 dB S/N vsvideo S/N versus picture content, Inter- carrier mode Intercarrier mode: SAW filter K2955M Black picture, White picture, 250 kHz squarewave 52 50 52 dB Symbol Parameter Test Conditions Min. Typ. Max. Unit deemp-T1 De-emphasis Time Constant B,G,D,K,I standards 50 µs deemp-T2 De-emphasis Time Constant M, N, standards 75 µs |
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