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STV223XD Datenblatt(PDF) 44 Page - STMicroelectronics |
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STV223XD Datenblatt(HTML) 44 Page - STMicroelectronics |
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44 / 76 page ![]() STV223XD/224XC - I²C BUS SELECTION 44/76 TUNER DELAY SIF FEATURES AND AUDIO SWITCHES Reg. Addr. (Hex) Description Bits Data Comments d7 d6 d5 d4 d3 d2 d1 d0 03 Tuner AGC Starting Point Adjustment 6X X X X X X 0 1 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 Min. Start point 2 mVRMS at PIF input. Typ. Start point 12 mVRMS at PIF input. Max. Start point 80 mVRMS at PIF input Tuner AGC Gain 20 0 1 1 0 1 0 1 X X X X X X X X X X X X X X X X X X X X X X X X 50 µA/dB. 95 µA/dB. 170 µA/dB. 270 µA/dB. Reg. Addr (Hex) Description Bits Data Comments d7 d6 d5 d4 d3 d2 d1 d0 04 Main Audio Output 2X X X X X X X X X X X X X X X X X X 0 0 1 0 1 X FM/AM audio selected. External audio selected. MUTE selected. FM De-emphasis Switch and FM de- viation range con- trol 2X X X X X X X X X X X X X X X X 0 0 1 1 0 1 0 1 X X X X X X X X Automatic control, according to sound standard. Deemphasis at 75 µs and FM deviation at ±25 kHz. Deemphasis at 50 µs and FM deviation at ±50 kHz. Deemphasis filter bypassed. FM demodulator defeat 1X X X X X X 0 1 X X X X X X X X 0 = FM demodulator active. 1 = FM demodulator defeat, FM out muted. AM/FM output se- lection 1X X X X 0 1 X X X X X X X X X X 0 = FM output selected. 1 = AM output selected. QSS and AM de- modulator defeat 1 X X 0 1 X X X X X X X X X X X X 0 = QSS and AM demod active, 1 = QSS and AM demod not active (OFF) Intercarrier filter ON/OFF 1 0 1 X X X X X X X X X X X X X X 0 = Intercarrier filter ON 1 = Intercarrier filter OFF 05 Volume Control Attenuation, Linear curve (dB) 10 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Attenuation = 0 dB. Attenuation = 78 dB. 7-bit resolution. Volume Control Attenuation, Non-linear curve (d0 = 0, d7 = 1) 11 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 Attenuation = 0 dB. Attenuation = 78 dB. 6-bit resolution. 06 PIF VCO compen- sation 1 X X X X X X X X X X X X X X 0 1 0 = Optimized for PIF from 33.9 to 38.9 MHz 1 = Optimized for PIF 45.75 & 58.75 MHz Sound standard selection 2X X X X X X X X X X X X X X X X X X X X 0 0 1 1 0 1 0 1 X X X X 6.5 MHz sound selected. 6.0 MHz sound selected. 5.5 MHz sound selected. 4.5 MHz sound selected. AGC SIF time constant (AM) 1X X X X X X X X 0 1 X X X X X X 0 = auto time constant. 1 = fast time constant forced. SAW filter switch output 1X X X X X X 0 1 X X X X X X X X 0 = output low (0.4 V Max.). 1 = output high (4 V Min.). CVBS output (from PIF circuit) 1 X X X X 0 1 X X X X X X X X X X 0 = CVBS output enable. 1 = CVBS output muted. QSS/Inter-carrier Application 1 X X 0 1 X X X X X X X X X X X X 0 = QSS application, intercarrier filter OFF 1 = Intercarrier application. Not to be used 1 0 X X X X X X X |
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