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OPL3/4+Codec Portable Clock SourceMaker : Integrated Circuit Systems
Shortcut : K140 K1400A K1400E70 K1400G K1400S K1403 K1413 K1419 K142 K142 K1449 K1459 K1460 K1462 K1463 K1470 K1472 K1482 K1488 |
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MK1422 OPL3/4+Codec Portable Clock Source Description 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 for the FM or wavetable music synthesizer. It includes a power down pin to save power without using a FET. In an 8 pin SOIC, the MK1422 can save component count, board space, and cost over surface mount crystals, and increase reliability by eliminating three mechanical devices from the board. MicroClock offers many other parts with stereo codec support. MicroClock invented sound clocks, and has the widest product offering and greatest production experience on these devices. The MK1422 is pin compatible with MicroClock’s popular MK1420 when the 14.318MHz clock output is not used. See the MK14223 for 3.3V. 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 pin. But the operating VDD on pin 2 must be 5V±10%. This technique is also effective if the input clock doesn’t meet the VIH and VIL specifications on page 3. Additional Clocks or Features If more than these three output clocks or features such as output enable are needed, MicroClock can provide a quick turn modification for your custom requirements. Block Diagram VDD GND All Chip Power Down 14.318 MHz crystal or clock X1/ICLK Crystal Oscillator X2 Output Buffer Clock Synthesis Circuitry Output Buffer Output Buffer 16.934 MHz 24.576 MHz 33.868 MHz MDS 1422 B 1 Revision 080698 Printed 11/15/00 Integrated Circuit Systems•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com MK1422 OPL3/4+Codec Portable Clock Source Pin Assignment Suggested Layout 14.318 MHz in Pin 1 8 X1/ICLK VDD GND 16.9M 1 2 3 4 8 7 6 5 X2 PD 33.9M 24.6M V 0.1µF 2 7 PD 33.9MHz out 33Ω (optional) 3 6 G 4 5 33Ω (optional) 33Ω (optional) Pin Descriptions Number 1 2 3 4 5 6 7 8 Name X1/ICLK VDD GND 16.9M 24.6M 33.9M PD X2 Type I P P O O O I O 16.9MHz out 24.6MHz out Description Crystal Connection. Connect to a 14.318 MHz crystal or clock. Connect to +5V. Connect to ground. 16.9344 MHz clock output for stereo codec. 24.576 MHz clock output for stereo codec. 33.868 MHz clock output for OPL4. Power Down. Shuts off entire chip when low. All clock outputs stop low. Crystal Connection to a 14.318 MHz crystal, or leave unconnected for clock input. Key: I = Input, O = output, P = power supply connection External Components/Crystal Selection A minimum number of external components are required for proper oscillation. For a crystal input, one 22pF load capacitor should be connected to each of the X1 and X2 pins and ground, and a parallel resonant 14.318 MHz, 16pF load, crystal is recommended. Load capacitor values near these are acceptable, as is a series resonant crystal, but either will result in frequencies which are further off of the target frequency. For a clock input, connect to X1 and leave X2 unconnected. A decoupling capacitor of 0.1µF should be connected between VDD and GND, and 33Ω terminating resistors may be used on the clock outputs. MDS 1422 B 2 Revision 080698 Printed 11/15/00 Integrated Circuit Systems•525 Race Street•San Jose•CA•95126•(408)295-9800telâ€... |
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