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