CXA1720Q

• Single 5 V power supply.
• Filter system can be switched among four modes: 1M/2M, and inner track/outer track. This allows for a significant reduction in the number of external parts such as differentiator constants, low-pass filters, and switches. (Compared with conventional Sony products, the number of parts has been reduced by one-half.)
• Filter characteristics can be customized.
• Low pre-amplifier input conversion noise voltage of 2.0 nV/ Ã Hz (typ.) keeps Read data output jitter to a minimum. The pre-amplifier voltage gain can be selected as either 100 or 200.
• The monostable multivibrator No. 1 pulse width switching function for the time domain filter permits switching between 1M and 2M mode.
• Write current switching function permits switching of the Write current among four modes: 1M/2M and inner track/outer track. (Filter inner track/outer track switching is separate.)
• Supply voltage detection circuit prohibits error writing during power ON/OFF or abnormal voltage.
• Power consumption is kept down to 115 mW (typ.) and this IC is suitable for use with battery-driven FDDs.
• Built in Time constant capacitors for monostable multivibrator Nos. 1 and 2. (The pulse width for monostable multivibrator No. 2 is fixed.)
• Power saving function reduces power consumption when the IC is not in use. When in power saving mode (5 mW typ.), only the power supply ON/OFF detector functions.
• The Write driver has a built-in reset circuit. When the mode is switched from Read mode to Write mode, the Write current flows from head 0A if head side 0 is selected and from head 1A if head side 1 is selected.