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TDA7407 Datasheet(PDF) 17 Page - STMicroelectronics |
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TDA7407 Datasheet(HTML) 17 Page - STMicroelectronics |
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17 / 46 page ![]() TDA7407 Noise blanker part 17/46 4 Noise blanker part ● internal 2nd order 140kHz high pass filter ● programmable trigger threshold ● trigger threshold dependent on high frequency noise with programmable gain ● additional circuits for deviation and fieldstrength dependent trigger adjustment ● very low offset current during hold time due to opamps wMOS inputs ● four selectable pulse suppression times ● programmable noise rectifier charge/discharge current Table 7. Noise blanker electrical characteristics Symbol Parameter Test condition Min. Typ. Max. Unit VTR Trigger threshold (1) (2) meas. with VPEAK = 0.9V NBT = 111 (10) 30 (10) mVOP NBT = 110 (10) 35 (10) mVOP NBT = 101 (10) 40 (10) mVOP NBT = 100 (10) 45 (10) mVOP NBT = 011 (10) 50 (10) mVOP NBT = 010 (10) 55 (10) mVOP NBT = 001 (10) 60 (10) mVOP NBT = 000 (10) 65 (10) mVOP VTRNOISE Noise controlled trigger threshold (3) meas. with VPEAK = 1.5V NCT = 00 (10) 260 (10) mVOP NCT = 01 (10) 220 (10) mVOP NCT = 10 (10) 180 (10) mVOP NCT = 11 (10) 140 (10) mVOP VRECT Rectifier voltage VMPX = 0mV NRD (7) = 00 0.5 0.9 1.3 V VMPX = 50mV; f = 150KHz 1.5 1.7 2.1 V VMPX = 200mV; f = 150KHz 2.2 2.5 2.9 V VRECT DEV Deviation dependent rectifier voltage (4) means. with VMPX = 800mV (75KHz dev.) OVD = 11 0.5 0.9(off) 1.3 VOP OVD = 10 0.9 1.2 1.5 VOP OVD = 01 1.7 2.0 2.3 VOP OVD = 00 2.5 2.8 3.1 VOP VRECT FS Fieldstrength controlled rectifier voltage (5) means. with VMPX = 0mV VLEVEL << VSBL (fully mono) FSC = 11 0.5 0.9(off) 1.3 V FSC = 10 0.9 1.4 1.5 V FSC = 01 1.7 1.9 2.3 V FSC = 00 2.1 2.4 3.1 V |
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