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CXA1720Q Scheda tecnica(PDF) 1 Page - Sony Corporation |
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CXA1720Q Scheda tecnica(HTML) 1 Page - Sony Corporation |
1 / 26 page Block Diagram and Pin Configuration —1— E93717-TE Read/Write Amplifier (with Built-in Filters) for FDDs 32 pin QFP (Plastic) CXA1720Q • 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. Description The CXA1720Q is an IC for use with floppy disk drives, and contains a Read circuit (with built-in filters), Write circuit, Erase circuit, and supply voltage detection circuit, all into a single chip. Features • 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/ √ 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.) FILTER OUT B COMP IN B COMP IN A A.GND MMVA FILTER SET Vcc HIGH DENSITY W/C 1 SET W/C 1 COMP W/C 2 SET W/C 2 COMP ERASE OUT 0 ERASE OUT 1 WRITE DRIVER ERASE DRIVER POWER MONITOR CONTROL LOGIC FILTER DIFF+LPF (BPF) 1 2 3 4 5 6 7 8 16 15 14 13 12 9 10 11 22 21 20 19 18 17 23 24 25 26 27 28 29 30 31 32 D.GND POWER SAVE PREAMP Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. For the availability of this product, please contact the sales office. |
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