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TDA7705 数据表(PDF) 25 Page - STMicroelectronics |
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TDA7705 数据表(HTML) 25 Page - STMicroelectronics |
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25 / 42 page ![]() TDA7705 Electrical specifications Doc ID 15938 Rev 9 25/42 3.5.2 AM MW overall system performance Antenna level equivalence: 0 dBµV = 1 µVrms. Figure 11. AM MW input set up Level referred to SG output before antenna dummy (Vrf, node 'A'); capacitive dummy 15pF+68pF, FM input not connected. Frf = 999 kHz (1000 kHz for US), Vrf =74 dBµV, mod = 30%, faudio =400 Hz, unless otherwise specified. Image rejection - - 80 - dB Logarithmic field strength indicator @40 dBµV read “FM_Smeter_log” -0.33 (equiv. to 37 dBµV) -0.3 -0.27 (equiv. to 43 dBµV) -- 1. Signal levels referred to combiner output. Table 17. FM overall system performance (continued) Parameter Test condition Min Typ Max Units Table 18. AM MW overall system performance Parameter Test condition Min Typ Max Units Tuning range MW Eu/Jp (can be modified by the user) 531 - 1629 kHz Tuning step MW Eu/Jp (can be modified by the user) - 9 - kHz Tuning range MW US (can be modified by the user) 530 - 1710 kHz Tuning step MW US (can be modified by the user) - 10 - kHz Sensitivity S/N = 20 dB - 27 30 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 - % Adjacent channel selectivity F=9 kHz, SINAD = 26 dB undesired. m=30%, 1 kHz -42 - dB Alternate channel selectivity F=18 kHz, SINAD=26 dB undesired. m=30%, 1kHz -50 - dB PCB UNDER TEST 30 Ω Vrf + 6dB Vrf 50 Ω 50 Ω 15pF 68pF A |
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