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| Multimedia ICs Clock generator BU2185F This IC generates the different clock used for DVD. Generates clocks for CD use, sound use, and MPEG use. *Applications DVD players *Features a crystal oscillating element, the dif1) By connecting ferent clock signals are generated. 2) Enables selection of the reference clock directly or with 1 / 2 output. 3) SOP 16-pin package. 4) Single 3.3V power supply. 5) With the standard clock output, an independent 5V power supply can be applied for a 5V output. *Block diagram DATA1A DATA1B XTAL1 IN XTAL1 OSC XTAL1 OUT PLL1 CLK2 (27.0000MHz ) SW CTRL1 H CLK1 (36.8640MHz) (18.4320MHz) L CTRL2 1/2 XTAL2 IN XTAL2 OSC XTAL 2OUT DATA2A DATA2B PLL2 CLK3 (33.8688MHz) OE CTRL1 H L H L CTRL2 L L H H DATA1A = XTAL2 DATA1B = XTAL2 DATA2A = XTAL2 DATA2B = XTAL2 SW H L H L 375 / 128 / 4 375 / 64 / 4 147 / 40 / 4 147 / 20 / 4 PLL1 DATA1A DATA1A DATA1B DATA1B PLL2 DATA2A DATA2A DATA2B DATA2B 1 Multimedia ICs BU2185F *Absolute maximum ratings (Ta = 25C) Parameter Applied voltage Input voltage Power dissipation Storage temperature Symbol VDD VIN Pd Tstg Limits - 0.5 ~ + 7.0 - 0.5 ~ VDD + 0.5 450 - 30 ~ + 125 Unit V V mW C Reduced by 4.5mW for increase in Ta of 1C over 25C. Not designed for radiation resistance. Does not represent guaranteed performance. *Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Input high level voltage Input low level voltage Operating temperature Output load Symbol VDD VIH VIL Topr CL Limits 3.0 ~ 3.6 0.8 x VDD ~ VDD 0.0 ~ 0.2 x VDD - 5 ~ + 70 15 (Max.) Unit V V V C pF *Pin descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin name XTAL1-IN XTAL1-OUT CTRL2 AGND DGND DVDD XTAL2-IN XTAL2-OUT CLK1 DVDD CLK2 DVDD AVDD CLK3 CTRL1 OE Pin descriptions Reference oscillation input 1 (not used) Reference oscillation output 1 XTAL setting (Low: XTAL = 36.8MHz mode; High: XTAL = 18.4MHz mode) Analog GND Digital GND Independent power supply for XTAL2-IN and XTAL2-OUT pins Reference oscillation input 2 (36.864MHz or 18.432MHz) Reference oscillation output 2 Reference clock output (36.864MHz or 18.432MHz) Independent power supply for CLK1 output buffer Clock output 2 (27.000MHz) Digital VDD Analog VDD Clock output 3 (33.8688MHz) CLK1 output selector (High: 36.864MHz; Low: 18.432MHz) Output enable (High: enable; Low: disable) Circuit D D A -- -- -- D D C -- C -- -- C A B 2 Multimedia ICs BU2185F *Input / output circuits Type A Type B Pin To inside Pin To inside 3, 15 16 Type C Type D Pin From inside Pin To inside 9, 11, 14 Pin 1, 2, 7, 8 3 Multimedia ICs otherwise noted, Ta = 25C, VDD *Electrical characteristics (unlessXTAL2 = 36.864MHz, 18.43MHz) ) (AVDD) = 3.3V, CL GND, Parameter Input low level voltage Input high level voltage Output low level voltage Output high level voltage Output low level voltage Output high level voltage Operating circuit current Symbol VIL VIH VOL VOH VOL VOH IDD Min. -- 0.7 x VDD -- 2.4 -- DVDD-0.5 -- Typ. -- -- -- -- -- -- 40 Max. 0.3 x VDD -- 0.4 -- 0.4 -- 60 Unit V V V V V V mA BU2185F 15PF, XTAL1 = shorted to Conditions CTRL1, CTRL2, OE CTRL1, CTRL2, OE I OL = 4.0mA CLK1, CLK2, CLK3 I OH = - 4.0mA CLK1, CLK2, CLK3 I OL = 0.5mA XTAL1OUT, XTAL2OUT I OH = - 0.5mA XTAL1OUT, XTAL2OUT No load When XTAL2 = 36.864MHz (XTAL1 is shorted to GND) CLK1 frequency1 CLK1 frequency2 CLK2 frequency CLK3 frequency CLK1-1 CLK1-2 CLK2 CLK3 -- -- -- -- 36.8640 18.4320 27.0000 33.8688 -- -- -- -- MHz MHz MHz MHz XTAL2 output CTRL1 = H, CTRL2 = L XTAL2 1 / 2 output CTRL1 = L, CTRL2 = L XTAL2 x 375 / 128 / 4 XTAL2 x 147 / 40 / 4 -- -- CTRL2 = L CTRL2 = L When XTAL2 = 18.432MHz (XTAL1 is shorted to GND) CLK1 frequency1 CLK2 frequency CLK3 frequency CLK1 CLK2 CLK3 -- -- -- 18.4320 27.0000 33.8688 -- -- -- MHz MHz MHz XTAL2 output CTRL1 = H, CTRL2 = H -- -- CTRL2 = H CTRL2 = H XTAL2 x 375 / 64 / 4 XTAL2 x 147 / 20 / 4 DUTY JITTER JITTER 27MHz S / N DUTY J1s Jabs CLK2SN 45 -- -- -- 50 100 600 65 55 -- -- -- % psec psec dB 1 / 2VDD Reference value (1sigma) Reference value (min.-to-max. width for jitter) 27MHz 20kHz RBW = 1kHz, SPAN = 200kHz 4 Multimedia ICs BU2185F *Application example 1 XTAL1 IN OE 16 H : ENABLE L : DISABLE H : 36.864MHz L : 18.432MHz 2 XTAL1 OUT CTRL1 15 L 3 CTRL2 CLK3 14 33.8688MHz AGND 4 AGND AVDD 13 AVDD DGND 5 DGND DVDD 12 DVDD DVDD 6 DVDD CLK2 11 27.0000MHz 7 36.8640MHz 8 XTAL2 IN DVDD 10 DVDD XTAL2 OUT CLK1 9 36.8640MHz 18.4320MHz 0.1F 1 XTAL1 IN OE 16 H : ENABLE L : DISABLE 2 XTAL1 OUT CTRL1 15 H : 18.432MHz H 3 CTRL2 CLK3 14 33.8688MHz AGND 4 AGND AVDD 13 AVDD DGND 5 DGND DVDD 12 DVDD DVDD 6 DVDD CLK2 11 27.0000MHz 7 18.4320MHz 8 XTAL2 IN DVDD 10 DVDD XTAL2 OUT CLK1 9 18.4320MHz 0.1F *Attached components are handles, use this IC mounted on a PC board. If used mounted by a socket, the proper Since high frequencies characteristics may not be able to be obtained. Be sure to connect a 0.1F capacitor between the analog power supply and analog GND. 5 Multimedia ICs BU2185F *External dimensions (Units: mm) 10.0 0.2 16 6.2 0.3 4.4 0.2 9 1 1.5 0.1 8 0.11 1.27 0.4 0.1 0.3Min. 0.15 SOP16 6 0.15 0.1 |
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