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STV224X 数据表(PDF) 27 Page - STMicroelectronics |
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STV224X 数据表(HTML) 27 Page - STMicroelectronics |
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27 / 86 page  STV224XH/228XH/223XH - ELECTRICAL CHARACTERISTICS 27/86 4.4 IF SECTION Tamb = 25°C, VCCIF = 5 V, VCC2 = 8V, IF input =10 mVRMS (at sync level for negative modulation, or at peak white level for positive modulation). Video modulation DSB, D = 90% and fSC = 33.4 MHz in B/G, D = 95% in L, fPC = 38.9 MHz. Video Bandwidth = 5 MHz, AF = 1 kHz, Audio Bandwidth = 20 kHz, FMdev = ±27 kHz. Volume Attenuation = 0 dB, AM carrier input: 10 mVRMS, 54% modulated unless otherwise specified. 4.4.1 PIF Amplifier 4.4.2 PIFAGC Negative Modulation 4.4.3 PIFAGC Positive Modulation 4.4.4 Tuner AGC Symbol Parameter Test Conditions Min. Typ. Max. Unit VINPIF Input Sensitivity -1dB at Video Output (INTCVBSOUT) 75 85 95 µVRMS RINPIF Differential Input Resistance PIF Inputs. 1.5 2 2.5 k W CINPIF Differential Input Capacitance PIF Inputs. 1.5 2 2.5 pF GR Gain Control Range 65 dB VMax. Maximum Input Signal +1dB at Video Output (INTCVBSOUT) 0.12 0.15 VRMS Symbol Parameter Test Conditions Min. Typ. Max. Unit IC Charging Current at AGCPIFCAP Pin 450 675 900 µA ID Discharging Current at AGCPIFCAP Pin 10 15 20 µA IC/ID Charging/Discharging Current Ratio 41 45 49 Symbol Parameter Test Conditions Min. Typ. Max. Unit IC Charging Current at AGCPIFCAP Pin 1.75 2.5 3.25 mA ID Discharging Current at AGCPIFCAP Pin 0.15 0.25 0.35 µA ICP Additional Charging Current at AGCPIFCAP Pin L mode in case of missing VITS pulses and no white in Video con- tent 2.8 4 5.2 µA THICP Threshold for additional charging cur- rent Referred to nominal black level 2.3 VPP at INTCVBSOUT Pin 160 mV IDP Additional Discharging Current 20 30 40 µA THIDP Threshold for additional discharging current Referred to nominal black level 2.3 VPP at INTCVBSOUT Pin -345 mV Symbol Parameter Test Conditions Min. Typ. Max. Unit IAGCT Maximum Sinked Current 1.5 2 2.5 mA SAGCT Tuner AGC Slope (current) Reg 03 (D7, D6) 00 01 10 11 50 95 170 270 µA/dB IAGCP Maximum Tuner plus Sinked Current (See Note 1) 40 mA AGCST Tuner AGC Starting Point (IF input related signal) Reg 03 (D5 to D0 = 10 0000) Reg 03 (D5 to D0 = 00 0000) Reg 03 (D5 to D0 = 11 1111) 12 2 80 mVRMS STT Variation of take over point with tem- perature 0.03 0.07 dB/K |
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