K142 - Integrated Circuit Systems

K142 OPL3/4+Codec Portable Clock Source

The MK1422 is the ideal way to generate clocks for sound in portable computers. It provides clocks for Analog Devices’ or Crystal Semiconductor’s stereo codecs, and Yamaha’s OPL3L, OPL3LS, and OPL4. The MK1422 uses either a 14.318 MHz crystal, or a 14.318 MHz bus clock input to synthesize the clocks required to drive the codec, and the 33.868 MHz required fo.

Features

• Packaged in 8 pin SOIC
• Input crystal or clock frequency of 14.318 MHz
• Output clock frequencies of 16.934 MHz, 24.576 MHz, and 33.868 MHz
• 25mA drive capability at TTL levels
• Advanced, low power CMOS process
• Low jitter ensures full 16 bit S/N ratio
• Insensitive to input clock duty cycle
• Power down for portable computers AC Coupling/Portable Applications For applications in portable computers, see the MK14223, which is specified to operate at 3.3V. It is possible to drive the MK1422 with a 3.3V, 14.318MHz clock by a.c. coupling using a 0.01µF capacitor connected in series to the X1.