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TDA7705 数据表(PDF) 27 Page - STMicroelectronics |
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TDA7705 数据表(HTML) 27 Page - STMicroelectronics |
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27 / 42 page  TDA7705 Electrical specifications Doc ID 15938 Rev 9 27/42 3.5.3 AM LW overall system performance Antenna level equivalence: 0 dBµV = 1 µVrms Figure 12. AM LW input set-up Level referred to SG output before antenna dummy (Vrf, node 'A'); capacitive dummy 15pF+68pF; FM input not connected. Frf = 216 kHz, Vrf =74 dBµV, mod = 30 %, faudio = 400 Hz, unless otherwise specified. Table 19. AM LW overall system performance Parameter Test condition Min Typ Max Units Tuning range LW (can be modified by the user) 144 - 288 kHz Tuning step LW (can be modified by the user) - 1 - kHz Sensitivity S/N =20 dB - 30 33 dBµV Ultimate S/N @ 80 dBµV 63 66 - dB AGC F.O.M. Ref.=74 dBµV -10dB drop point 50 62 65 dB Distortion m = 80 % - 0.1 - % Image rejection - - 80 - dB PCB UNDER TEST 30 Ω Vrf + 6dB Vrf 50 Ω 50 Ω 15pF 68pF A |
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