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TDA9850 데이터시트(PDF) 10 Page - NXP Semiconductors |
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10 / 32 page 1995 Jun 19 10 Philips Semiconductors Preliminary specification I2C-bus controlled BTSC stereo/SAP decoder TDA9850 REQUIREMENTS FOR THE COMPOSITE INPUT SIGNAL TO ENSURE CORRECT SYSTEM PERFORMANCE Notes 1. Low-ohmic preferred, otherwise the signal loss and spreading at COMP, caused by ZO and the composite input impedance (see Chapter “Characteristics”; row head “Input level adjustment control”) must be taken into account. 2. In order to prevent clipping at over-modulation (maximum deviation in the BTSC system for 100% modulation is 73 kHz). 3. For example colour bar or flat field white; 100% video modulation. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT COMPL+R(rms) composite input level for 100% modulation L + R (25 kHz deviation); RMS value; fi = 300 Hz measured at COMP 162 250 363 mV ∆COMP composite input level spreading under operating conditions Tamb = −20 to +70 °C; aging; power supply influence −0.5 − +0.5 dB Zsource source impedance note 1 − low-ohmic 5 k Ω flf low frequency roll-off 25 kHz deviation L + R; −2dB −− 5Hz fhf high frequency roll-off 25 kHz deviation L + R; −2 dB 100 −− kHz THDL,R total harmonic distortion L + R fi = 1 kHz; 25 kHz deviation −− 0.5 % fi = 1 kHz; 125 kHz deviation; note 2 −− 1.5 % S/N signal-to-noise ratio L + R/noise CCIR 468-2 weighted quasi peak; L + R; 25 kHz deviation; fi = 1 kHz; 75 µs de-emphasis critical picture modulation; note 3 44 −− dB with sync only 54 −− dB α SB side band suppression mono into unmodulated SAP carrier; SAP carrier/side band mono signal: 25 kHz deviation, fi = 1 kHz; side band: SAP carrier frequency ±1 kHz 40 −− dB α SP spectral spurious attenuation L + R/spurious 50 Hz to 100 kHz; mainly n × fH; no de-emphasis; L + R; 25 kHz deviation, f = 1 kHz as reference n = 1, 4, 5, 6 35 −− dB n = 2, 3 26 −− dB |
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