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TDA7405 数据表(PDF) 24 Page - STMicroelectronics |
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TDA7405 数据表(HTML) 24 Page - STMicroelectronics |
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24 / 56 page ![]() TDA7405 24/56 DEEMPHASIS and HIGHCUT τDeempF M Deemphasis Timeconstants FM VLEVEL >> VHCH 25 50 75 µs VLEVEL >> VHCH 44 62.5 80 µs VLEVEL >> VHCH 50 75 100 µs VLEVEL >> VHCH 70 100 130 µs MFM Highcut Timeconstant Multiplier FM VLEVEL << VHCL 3 τDeempA M Deemphasis Timeconstants AM VLEVEL >> VHCH 37.5 µs VLEVEL >> VHCH 47 µs VLEVEL >> VHCH 56 µs VLEVEL >> VHCH 75 µs MAM Highcut Timeconstant Multiplier AM VLEVEL << VHCL 3.7 REF5V Internal Reference Voltage 4.7 5 5.3 V Lmin min. LEVEL Gain -1 0 1 dB Lmaxs max. LEVEL Gain 5 6 7 dB LGstep LEVEL Gain Step Resolution see section 2.7 0.2 0.4 0.6 dB VSBLmin Min. Voltage for Mono see section 2.8 17 20 23 %REF5V VSBLmax Max. Voltage for Mono see section 2.8 62 70 78 %REF5V VSBLstep Step Resolution see section 2.8 1.6 3.3 5.0 %REF5V VHCHmin Min. Voltage for NO Highcut see section 2.9 37 42 47 %REF5V VHCHmax Max. Voltage for NO Highcut see section 2.9 58 66 74 %REF5V VHCHstep Step Resolution see section 2.9 4.2 8.4 12.6 %REF5V VHCLmin Min. Voltage for FULL High cut see section 2.9 15 17 19 %VHCH VHCLmax Max. Voltage for FULL High cut see section 2.9 29 33 37 %VHCH VHCLstep Step Resolution see section 2.9 2.1 4.2 6.3 %REF5V Carrier and harmonic suppression at the output α19 Pilot Signalf=19kHz 40 50 dB α38 Subcarrier f=38kHz 75 dB α57 Subcarrier f=57kHz 62 dB α76 Subcarrier f=76kHz 90 dB Table 3. ELECTRICAL CHARACTERISTICS (continued) VS = 9V, deemphasis time constant = 50µs, MPX input voltage VMPX = 500mV (75kHz deviation), modulation frequency = 1kHz, input gain = 6dB, Tamb = 27°C, unless otherwise specified. Symbol Parameter Test Conditions Min. Typ. Max. Unit |
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