CXA1702AR データシートの表示（PDF） - Sony Semiconductor
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CXA1702AR Datasheet PDF : 24 Pages
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CXA1702AR
Description of Operation
<Mix amplifier + recording level adjustment>
Y, chroma, AFM, ATF and PCM signals are input at specified levels so that they are mixed internally to
achieve an appropriate current value at the head. The video path signal (Y + chroma + AFM + ATF) is output
to Pin 56 (RECVTR) and the PCM path signal (PCM + ATF) to Pin 54 (RECPCM). The Y level is EVR-
adjusted at Pin 8 (YLEV_MTG) and the low band (chroma, AFM, ATF) level at Pin 6 (LOWLEVEL). The low-
band levels of the video path and the PCM path are interlocked in adjustment.
<SW + recording amplifier>
The video path signal and the PCM path signal, which underwent recording level adjustment, are switched at
a correct timing, then converted to a current to drive the head.
A feedback dumping circuit is incorporated to inhibit head resonance, and the peaking amount can be
adjusted by EVR at Pin 34 (REC1ACNT), Pin 36 (REC1BCNT), Pin 45 (REC2ACNT) and Pin 47
(REC2BCNT).
During recording, the output capacitance is about 12 pF including that of the head amplifier.
<Head amplifier>
The playback signal from the head is amplified with low noise and high gain. A feedback dumping circuit is
incorporated to inhibit head resonance, and the peaking amount can be adjusted by external resistors
connected to Pin 30 (PBDUMP1A), Pin 40 (PBDUMP1B), Pin 41 (PBDUMP2A) and Pin 51 (PBDUMP2B).
During playback, the input capacitance is about 20 pF including that of the recording amplifier.
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