Audio Peripheral Clock Generator Select FREQUENCY TABLE

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Audio Peripheral Clock Generator Select FREQUENCY TABLE

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SC675
Audio Peripheral Clock Generator
Select
FREQUENCY TABLE
Audio Frequency Outputs(MHz) Faud Xin/2 24.576 33.868 HFaud Xin/4 12.288 16.934 Fixed Frequency Outputs(MHz) SREF0 REF1,2 14.318 14.318 14.318 Xin/ Xin/
Supports Intel architecture based desktop complimenting SC673 SC674 next generation chipsets from Intel. clocks clock. Selectable audio clocks. Supports 3.3V. SSOP minimum board space.
BLOCK DIAGRAM
CONNECTION DIAGRAM
Xout Faud HFaud REF2 REF1 SREF0
XOUT
SREF0
REF(1:2)
PLL1
Faud HFaud
PLL2
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.3
3/21/97 Page
SC675
Audio Peripheral Clock Generator
DESCRIPTION
Xin, Xout On-chip reference oscillator buffer. These pins connected terminals parallel anti-) resonant crystal. also used input externally generated signal; this case Xout must left unconnected (floating.) Output Enable input. When (0), outputs tristated. When high default) outputs toggling. This internal pull-up. Faud Audio frequency output. Selectable with table page HFaud Audio frequency output. This output divide frequency selected Faud. Input select lines programming audio (Faud HFaud) output frequency. table, page frequency selection. These pins have internal pull-ups. clock output. center frequency this clock within spec. 0.167 accuracy. clock output. center frequency this clock within 0.167 accuracy. REF(1:2) These buffered outputs reference input signal. SREF0 This buffered output reference input signal. Circuit ground. Power supply. 0.1µF capacitor must placed close possible each pin. Otherwise filtering intent will neutralized trace lead inductance.
MAXIMUM RATINGS
Voltage Relative VSS: -0.3V Voltage Relative 0.3V Storage Temperature: Ambient Temperature: Maximum Operating Supply: This device contains circuitry protect inputs against damage high static voltages electric field; however, precautions should taken avoid application voltage higher than maximum rated voltages circuit. proper operation, Vout should constrained range: <(Vin, Vout)< Unused inputs must always tied appropriate logic voltage level (either VDD).
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.3
3/21/97 Page
SC675
Audio Peripheral Clock Generator
ELECTRICAL CHARACTERISTICS
Characteristic Input Voltage Input High Voltage Current Pull-Up Output Voltage Output High Voltage Tri-State leakage Current Dynamic Supply Current Static Supply Current Short Circuit Current Symbol Units output time sec. 3.3V 10%. Faud 33.868 12mA 12mA Conditions
IIL,
SWITCHING CHARACTERISTICS
Characteristic Output Rise (0.4V 2.0V) Fall (2.0V-0.4V) time Output duty cycle
Cycle cycle Period
Symbol tTLH, tTHL tjab Iol, Iol,
Units
Conditions load. OUTPUTS load. OUTPUTS Measured 1.5V Measured 1.5V CPU* Measured 1.5V CPU*
MHZ, MHZ, REF(1:2), Faud, HFaud SREF0
Jitter Absolute Switching current (AC) Switching current (AC)
3.3V 10%.
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.3
3/21/97 Page
SC675
Audio Peripheral Clock Generator
LAYOUT RECOMMENDATION
IMISC675
plane
This only layout recommendation. designer choose different approach such using islands instead traces. Regardless layout implementation, Bypass caps (all 0.1µF) should always used placed close their pins possible. Caps should multilayer impedance high frequencies such material.
22µF
PACKAGE DRAWINGS DIMENSIONS
SYMBOL
SSOP OUTLINE DIMENSIONS
INCHES 0.068 0.002 0.066 0.010 0.005 0.278 0.205 0.301 0.022 0.073 0.005 0.068 0.012 0.006 0.284 0.209 0.0256 0.307 0.030 0.311 0.037 7.65 0.55 0.078 0.008 0.070 0.015 0.009 0.289 0.212 1.73 0.05 1.68 0.25 0.13 7.07 5.20 MILLIMETERS 1.86 0.13 1.73 0.30 0.15 7.20 5.30 7.80 0.75 1.99 0.21 1.78 0.38 0.22 7.33 5.38 7.90 0.95
0.65
ORDERING INFORMATION
Part Number Package Type SSOP Production Flow Commercial, Rev.1.3 3/21/97 Page
IMISC675AYB
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571

Audio Peripheral Clock Generator Select FREQUENCY TABLE

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