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TDA7421 数据表(PDF) 7 Page - STMicroelectronics |
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TDA7421 数据表(HTML) 7 Page - STMicroelectronics |
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7 / 38 page  ELECTRICAL CHARACTERISTICS (continued) FM IF Amplifier 1 Ref: FM Test Circuit, measure input at VFMAMP1IN, output at VFMAMP1OUT Symbol Parameter Test Condition Min. Typ. Max. Unit RIN,AMP1 Input Resistance f = 10.7MHz 330 Ω ROUT,AMP1 Output Resistance f = 10.7MHz 330 Ω GTYP,AMP1 Typical Gain fIN = 10.7MHz, FBH3-0 set to 0100 16.5 17.5 18.5 dB GMIN,AMP1 Minimum Gain fIN = 10.7MHz, FBH3-0 set to 0001 14.5 15.5 16.5 dB GMAX,AMP1 Maximum Gain fIN = 10.7MHz, FBH3-0 set to 0000 18.5 19.5 20.5 dB IP3AMP1 3rd Order Intermodulation Distortion Intercept Point fd = 10.7MHz; fu1= 10.8MHz; fu2= 10.9MHz, FBH3-0 set to 0100 109 dBu CP1AMP1 1dB Compression Point fIN = 10.7MHz; FBH3-0 set to 0100 96 dBu FM IF Amplifier 2 Ref: FM Test Circuit, measure input at VFMAMP2IN, output at VFMAMP2OUT Symbol Parameter Test Condition Min. Typ. Max. Unit RIN,AMP2 Input Resistance f = 10.7MHz 330 Ω ROUT,AMP2 Output Resistance f = 10.7MHz 330 Ω GTYP,AMP2 Typical Gain fIN = 10.7MHz, FBL3-0 set to 0100 5 6 7 dB GMIN,AMP2 Minimum Gain fIN = 10.7MHz, FBL3-0 set to 0001 3 4 5 dB GMAX,AMP2 Maximum Gain fIN = 10.7MHz, FBL3-0 set to 0000 7 8 9 dB IP3AMP2 3rd Order Intermodulation Distortion Intercept Point fd = 10.7MHz; fu1= 10.8MHz; fu2= 10.9MHz, FBL3-0 set to 0100 122 dBu CP1AMP2 1dB Compression Point fIN = 10.7MHz; FBL3-0 set to 0100 110 dBu FM Limiter, Field Strengh Meter and Demodulator Ref: FM Test circuit, measure: - Input at VFMLIMIN, fIN = 10.7MHz - filtered FS Meter output at VSM,FILT - shifted FS Meter output at VSM,SHIFT (FMADJ set to 0) - demodulator adjustment output at VSM,SHIFT (FMADJ set to 1) Symbol Parameter Test Condition Min. Typ. Max. Unit RIN,LIM Limiter Input Resistance 330 Ω GLIM Limiter Gain 90 dB LS Limiting Sensitivity 23 dBu SM1 Smeter 1 at VSM,FILT VFMLIMIN = 42dBu 0.1 (1) 0.25 0.5 (1) V SM2 Smeter 2 at VSM,FILT VFMLIMIN = 77dBu 2.4 (1) 2.75 3.1 (1) V SM3 Smeter 3 at VSM,FILT VFMLIMIN = 102dBu 4.0 (1) 4.35 4.7 (1) V SMMINSHIFT Smeter Minimum Shift Voltage at VSM,SHIFT referred to VSM,FILT VFMLIMIN = 70dBu, FSL4-0 set to 00000 0.25 0.3 0.35 V SMMAXSHIFT Smeter Maximum Shift Voltage at VSM,SHIFT referred to VSM,FILT VFMLIMIN = 70dBu, FSL4-0 set to 11111 1.55 1.8 2.05 V GDEM Demodulator Conversion Gain VFMLIMIN > LS 2 mVRMS/ KHz GDEMADJ Demodulator Adjustment Conversion Gain VFMLIMIN > LS, measured at VSMSHIFT, FMADJ set to 1 14 mVRMS/ KHz NOTE1: Refer to Global application circuit; input at first Ceramic Filter in, FBH3-0 set to 0001, FBL3-0 set to 0001 TDA7421 7/38 |
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