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CXA2581 Scheda tecnica(PDF) 9 Page - Sony Corporation |
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CXA2581 Scheda tecnica(HTML) 9 Page - Sony Corporation |
9 / 22 page – 9 – CXA2581N Description of Functions • RFAC The RF signal input by connecting capacitance to the EQ_IN pin is equalized, arithmetically amplified and then output from the RFAC pin. AC SUM EQ RW/ROM BST = VCC 6 7 8 9 A B C D RFG EQ_IN AC_SUM RF 26 25 24 VFC RFC 5.1k BST VCC 4 3 23 15 RFAC Amp 0.1 µ The EQ can be bypassed by connecting the BST control pin (Pin 24) to VCC. In this case only the EQ block enters sleep mode and low power consumption mode (slim mode) is activated. The low frequency gain is the same value as for EQ ON mode. If RF (summing signal) is present at the pickup output pin, input the addition output signal to EQ_IN (Pin 3) coupled by capacitance. When using a pickup without a summing output function, perform addition with the AC SUM block and then input the signal to EQ_IN (Pin 3) coupled by capacitance. RW/ROM switching is done by the VCA block, so either input method can be used without problem. The RW gain is 12dB higher than the ROM gain. Low frequency gain AC_SUM: 13dB (both ROM/RW) VCA to RFAC ROM: 0dB RW: 12dB VC – 1 VC VC + 1 Vcnt [V] 8 0 –8 Gain [dB] VCA variable range The VCA low frequency gain can be adjusted by the RFG (Pin 23) voltage. The control voltage vs. low frequency gain characteristics are shown in the graph to the right. The RFAC pin (Pin 15) is an NPN transistor emitter follower output. The maximum drive current is approximately 2mA. If the load capacitance distorts the output waveform, connect resistance between Pin 15 and GND to increase the drive current. |
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