K142 Datasheet: OPL3/4+Codec Portable Clock Source





K142 OPL3/4+Codec Portable Clock Source Datasheet

Part Number K142
Description OPL3/4+Codec Portable Clock Source
Manufacture Integrated Circuit Systems
Total Page 4 Pages
PDF Download Download K142 Datasheet PDF

Features: MK1422 OPL3/4+Codec Portable Clock Sourc e Description The MK1422 is the ideal w ay to generate clocks for sound in port able computers. It provides clocks for Analog Devices’ or Crystal Semiconduc tor’s stereo codecs, and Yamaha’s O PL3L, OPL3LS, and OPL4. The MK1422 uses either a 14.318 MHz crystal, or a 14.3 18 MHz bus clock input to synthesize th e clocks required to drive the codec, a nd the 33.868 MHz required for the FM o r wavetable music synthesizer. It inclu des a power down pin to save power with out using a FET. In an 8 pin SOIC, the MK1422 can save component count, board space, and cost over surface mount crys tals, and increase reliability by elimi nating three mechanical devices from th e board. MicroClock offers many other p arts with stereo codec support. MicroCl ock invented sound clocks, and has the widest product offering and greatest pr oduction experience on these devices. T he MK1422 is pin compatible with MicroC lock’s popular MK1420 when the 14.318MHz clock output is not used. Se.

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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.
Block Diagram
VDD GND
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.
All Chip
Power Down
14.318 MHz
crystal or clock
X1/ICLK
X2
Crystal
Oscillator
Clock Synthesis
Circuitry
Output
Buffer
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

           






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