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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA7540N датащи(PDF) 19 Page - STMicroelectronics |
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TDA7540N датащи(HTML) 19 Page - STMicroelectronics |
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19 / 76 page  TDA7540N Electrical specifications 19/76 3.3.4 Stereodecoder A Max. gain Mixer2 tank output 34 dB ΔA Gain control range 20 dB Cmin Min. cap step IF2T 1.6 pF Cmax Max. cap IF2T 24 pF C62-63 IF2T 2 pF IF noise blanking tbl Min. blanking time 8 μs tbl Max. blanking time 17 μs Vth Min internal threshold 10 12.5 15 mV Vth Max. internal threshold 150 187.5 225 mV Vthstep Threshold step 10 12.5 15 mV Vdesth Min. desensitivity threshold 2.9 3.2 3.5 V Vdesth Max. desensitivity threshold 3.6 4 4.4 V Table 7. AM section electrical characteristics (continued) (Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, fRF = 98MHz, m= 30%, fMOD = 400kHz, fXtal = 10.25MHz, in application circuit, unless otherwise specified). Symbol Parameter Test conditions Min. Typ. Max. Unit Table 8. Stereodecoder electrical characteristics (Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V, VMPX = 500mVrms mono, f = 1kHz, deemphasis = 50µs, fXtal = 10.25MHz, in application circuit, unless otherwise specified). Symbol Parameter Test conditions Min. Typ. Max. Unit Stereodecoder Vin MPX input level STD Gain = 2.5 dB 0.5 0.93 Vrms Rin Input resistance 70 100 130 k Ω Gmin Min. Stereodecoder gain -0.5 0 0.5 dB Gmax Max. Stereodecoder gain 3.15 3.75 4.35 dB Gstep Stereodecoder gain step resolution 1 1.25 1.5 dB SVRR Supply voltage ripple rejection Vripple = 100mV, f = 1kHz 54 60 dB a Max. channel separation VMPX = 500mVrms stereo only L/R 50 dB THD Total harmonic distortion 0.02 0.3 % (S+N)/N Signal plus Noise to Noise ratio A-weighted, 19kHz notch 85 dB |
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