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TDA7421 数据表(PDF) 6 Page - STMicroelectronics |
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TDA7421 数据表(HTML) 6 Page - STMicroelectronics |
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6 / 38 page  Symbol Parameter Test Condition Min. Typ. Max. Uni S+N/N Signal to Noise Ratio 68 dB THD Total Harmonic Distortion deviation = 40KHz 0.3 % VO AF Audio Output Level 350 400 450 mVRMS US Usable Sensitivity antenna level at which S+N/N=30dB 4dBu AGCrange Range AGC FM 65 dB ELECTRICAL CHARACTERISTICS (continued) FM Section Global Performances Refer to Evaluation Circuit and enclosed curves (S+N/N, THD) - RF Input: fc = 98.1MHz, 75KHz dev., 1KHz mod.,60dBu - Audio Output: BPF 20Hz - 20KHz FM AGC Ref: FM Test Circuit, measure input at VFMRFAGCIN, and VFMIFAGCIN, output at VFMAGCOUT Symbol Parameter Test Condition Min. Typ. Max. Unit VRFAGCSTART Open Loop Rf Agc Starting Point fRFAGCIN = 98.1MHz Value of VFMRFAGCIN, at which VFMAGCOUT = 4V 74 80 86 dBu RINRFAGC Input Resistance 20 K Ω VIFAGCSTART Open Loop If Agc Starting Point fIFAGCIN = 10.7MHz Value of VFMIFAGCIN, at which VFMAGCOUT = 4V FAGC2-0 set to 111 71 77 83 dBu RINIFAGC Input Resistance 20 K Ω ROUTFMAGC Output Resistance 10 K Ω FM Mixer Ref: FM Test Circuit, measure input at VMIXFMIN, output at VMIXOUT Symbol Parameter Test Condition Min. Typ. Max. Unit ZIN,MIX Single-ended input impedance (pin 3, pin4) f = 100MHz 12 Ω GMIX Conversion Gain fIN = 98.1MHz 21.8 dB IP3MIX 3rd order intermodulation distortion intercept point fd = 98.1MHz; fu1 = 98.2MHz; fu2 = 98.3MHz; 104 dBu CP1MIX 1dB compression point fIN = 98.1MHz 90 dBu Symbol Parameter Test Condition Min. Typ. Max. Uni ANTADJ MAX OFF Maximum FM Antenna Filter Adjustment Voltage Offset VPLLOUT = 2.5V, ANA3-0 set to 1111 21 25 27 % ANTADJ STEP OFF FM Antenna Filter Adjustment Voltage Offset Step VPLLOUT = 2.5V, ANA3-0 set to 1001 2.8 3.6 4.4 % RFADJ MAX OFF Maximum FM RF Filter Adjustment Voltage Offset VPLLOUT = 2.5V, RFA3-0 set to 1111 21 25 27 % RFADJ STEP OFF FM RF Filter Adjustment Voltage Offset Step VPLLOUT = 2.5V, RFA3-0 set to 1001 2.8 3.6 4.4 % FM Front-end Electrical Adjustments Ref: FM Test Circuit measure VANTADJ and VRFADJ referred to VPLLOUT TDA7421 6/38 |
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