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TDA7420 Datasheet(PDF) 7 Page - STMicroelectronics |
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TDA7420 Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 29 page  STEREO DECODER PART ELECTRICAL CHARACTERISTICS (VS = 8.5V; de-emphasis time: T = 50 µs; nominal MPX input volt- age on pin 61 (composite): VMPX = 0.5VRMS (75KHz deviation); modulation frequency = 1KHz; GI = 1.5dB; Tamb =27 °C; unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit SVRR Supply Voltage Ripple Rejection VRIPPLE = 100mV; f = 1KHz 50 65 dB VO DC Output Voltage (HCL, HCR) 3.95 4.25 4.55 V α Channel Separation VSB -VR = 100mVDC 50 dB THD Total Harmonic Distortion 0.02 0.3 % S + N N Signal Plus Noise to Noise Ratio f = 20Hz to 16KHz; S=2VRMS 91 dB MONO/ STEREO SWITCH VINTH Pilot Threshold Voltage for stereo ”ON” Pth =1 Pth =0 12 19 16 26 22 34 mVRMS mVRMS VINTH Pilot Threshold Voltage for stereo ”OFF” Pth =1 Pth =0 8 16 14 22 20 28 mVRMS mVRMS STEREO BLEND VSB-VR Control Voltage for Channel Separation α = 6dB; (note 5) -300 -250 -200 mV α = 26dB; -80 mV HIGH CUT CONTROL τdeemp De-Emphasis Time Constant CL,CR = 1nF; STDDS = 0 VHCC -VR = 100mV 43 50 57 µs CL,CR = 1nF; STDDS = 1 VHCC -VR = 100mV 64 75 86 µs RHCC High Cut Control Resistance VHCC -VR = 100mV; STDDS = 0 43 50 57 K Ω VHCC -VR = -0.5V (note 5) 115 150 185 K Ω VCO fOSC Oscillator Frequency 456 KHz ∆f/f Capture and Hold Range 0.5 1 % CARRIER AND HARMONIC SUPPRESSION AT THE OUTPUT α19 Pilot Signal f = 19KHz 40 55 dB α38 Subcarrier f = 38KHz 75 dB α57 Subcarrier f = 57KHz 62 dB α76 Subcarrier f = 76KHz 90 dB INTERMODULATION (note 1) α2fmod = 10KHz; fspur = 1KHz 65 dB α3fmod = 13KHz; fspur = 1KHz 75 dB TRAFFIC RADIO (note 2) α57 Signal f = 57KHz 70 dB SCA - SUBSIDIARY COMMUNICATIONS AUTHORIZATION (note 3) α67 Signal f = 67KHz 75 dB ACI - ADJACENT CHANNEL INTERFERENCE (note4) α114 Signal f = 114KHz 95 dB α190 Signal f = 190KHz 84 dB TDA7420 7/29 |
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