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TDA7405 датащи(PDF) 26 Page - STMicroelectronics |
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TDA7405 датащи(HTML) 26 Page - STMicroelectronics |
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26 / 56 page ![]() TDA7405 26/56 Note 4. ACI ( Adjacent Channel Interference ) measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal (fs = 110kHz or 186kHz, un- modulated). NOISE BLANKER PART Features: s AM and FM mode s internal 2nd order 140kHz high-pass filter for MPX path s internal rectifier and filters for AM-IF path s programmable trigger thresholds s trigger threshold dependent on high frequency noise with programmable gain s additional circuits for deviation- and fieldstrength-dependent trigger adjustment s 4 selectable pulse suppression times for each mode s programmable noise rectifier charge/discharge current Table 4. ELECTRICAL CHARACTERISTICS All parameters mesured in FM mode if not otherwise specified. Symbol Parameter Test conditions Min. Typ. Max. Unit VTR Trigger Threshold 5) meas.with VPEAK=0.9V 111 30 mVOP 110 35 mVOP 101 40 mVOP 100 45 mVOP 011 50 mVOP 010 55 mVOP 001 60 mVOP 000 65 mVOP VTRNOISE noise controlled Trigger Threshold meas.with VPEAK=1.5V 00 260 mVOP 01 220 mVOP 10 180 mVOP 11 140 mVOP α114 V o s ign al () at1kHz () V o sp u r io u s () at4kHz () ---------------------------------------------------------------- ƒ s ; 110kH z 3 38 kHz ⋅ () – == α190 V o s ign al () at1kHz () V o sp u r io u s () at4kHz () ---------------------------------------------------------------- ƒ s ; 186kH z 5 38 kHz ⋅ () – == |
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