PDF SM8703AV Data sheet ( Hoja de datos )

Número de pieza	SM8703AV
Descripción	Clock Generator for MPEG2 System
Fabricantes	Nippon Precision Circuits Inc
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No Preview Available ! NIPPON PRECISION CIRCUITS INC. SM8703AV Clock Generator for MPEG2 System OVERVIEW The SM8703AV is a 27 MHz master clock, 5-system output clock generator for MPEG2 system. It has 2 built- in PLLs that, with the addition of a single crystal oscillator element, can generate 384fs, 512fs and 768fs clocks which are necessary for MPEG2 system, plus independent ﬁxed-frequency 27 MHz and 33.8688 MHz output clocks. Each output can stop unused output by using disable function, therefore, unnecessary radiation can be suppressed. Also, visual and audio synchronous is not disrupted since each output frequency is kept in the normal ratio. Supported sampling frequencies (fs) include 44.1 or 48 kHz. FEATURES s 27 MHz master clock (internal PLL reference clock) s Generated clocks • 27 MHz output • 33.8688 MHz output • 384fs output • 512fs output • 768fs output s Sampling frequency fs • 44.1/48 kHz s Output disable function s Low jitter output: 100 ps (typ, 15pF load) s Supply voltage: 3.3 V s 24-pin VSOP package APPLICATIONS s DVD players s Set top box s MPEG2 system ORDERING INFORMATION PINOUT (Top View) VDD VSS MO1 MCK MLEN VDDA VSSA XTI XTO RSV RSV SO1 1 12 24 MO2 FSEL/MDT SO5 RSV SO2 VDD1 VSS1 RSV SO3 SO4 VDD2 13 VSS2 PACKAGE DIMENSIONS (Unit: mm) Device SM8703AV Package 24-pin VSOP 7.8 ± 0.1 0.15 + − 00..0025 0.65 0.1 + 0.1 0.22 − 0.05 0.13 M 0 to 10 NIPPON PRECISION CIRCUITS—1 1 page SM8703AV DC Electrical Characteristics External clock, Ta = –40 to 85 °C, VDDA = VDD = VDD1 = VDD2 = 3.0 to 3.6 V unless otherwise stated Parameter Current consumption HIGH-level input voltage L OW -level input voltage HIGH-level input current L OW -level input current HIGH-level input current L OW -level input current HIGH-level output voltage L OW -level output voltage Symbol ID D V IH V IL II H 1 IIL1 II H 2 IIL2 VOH VOL Condition All supplies. V D D A = V D D = V D D 1 = V D D 2 = 3.3V, Ta = 25 °C , fs = 48 kHz, Crystal oscillator element, no load on all outputs XTI, FSEL/MDT, MCK, MLEN XTI, FSEL/MDT, MCK, MLEN FSEL/MDT, MCK, MLEN, V IN = V D D FSEL/MDT, MCK, MLEN, V IN = 0 V XTI, VIN = VDD XTI, VIN = 0 V All outputs. IO H = −2 m A All outputs. IO L = 4 mA min – 0.8 VDD – – – – – VDD − 0.4 – Rating typ 32 – – – – – – – – max 45 – 0.2 VDD 1 −1 0 0 40 −4 0 – 0.4 Unit mA V V µA µA µA µA V V AC Electrical Characteristics External clock, Ta = –40 to 85 °C, VDDA = VDD = VDD1 = VDD2 = 3.0 to 3.6 V unless otherwise stated Parameter Symbol Condition Rating min typ XTI external input clock frequency fM – 27.0000 Output clock rise time tR All outputs, 0.2 to 0.8VDD , CL = 15 pF – 2.0 Output clock fall time tF All outputs, 0.8 to 0.2VDD , CL = 15 pF – 2.0 Output clock jitter1 JITTER All outputs, Standard tolerance, Crystal oscillator element, CL = 15 pF – 100 Output clock duty1 DUTY All outputs, Crystal oscillator element, 1.4V to 1.4V, CL = 15 p F 45 50 Settling time Power-up time2 tS All outputs tP All outputs –– – 15 1. 1.4V to 1.4V. Ta = 2 0 °C . The characteristics of output clock jitter and output clock duty depends on crystal oscillator. N P C ’s standard crystal oscillator: R = 10.5 Ω, L = 5.38 mH, Ca = 6.74 fF, Cb = 1.85 p F measurement apparatus: HP4195 Load capacitance: C1 = 7 p F, C2 = 11 p F max – – – – 55 100 30 Unit MHz ns ns ps % ns ms Cb L Ca R 2. Time from OFF condition to stable frequency output. NIPPON PRECISION CIRCUITS—5 5 Page TYPICAL APPLICATION SM8703AV +3.3V CPU +3.3V VDD MO2 C3 VSS FSEL/MDT MO1 SO5 MCK RSV MLEN SO2 VDDA VDD1 C4 VSSA VSS1 XTI C1 X'tal XTO C2 RSV RSV SO3 SO4 RSV VDD2 SO1 VSS2 SM8703AV C5 C6 27MHz 27MHz 768fs 384fs 512fs 512fs 33.8688MHz s Connect the decoupling capacitors (approximately 0.1µF and 1000pF) in parallel, as close to power supply pins as possible. s In order to minimize noise, it is useful to make VSS as solid pattern. s Master clock stability affects the other outputs sta- bility. In the usage of crystal oscillator, load capacitor and crystal oscillator should be placed as close to the SM8703AV as possible, and wired shortly. Select crystal oscillators and load capaci- tance carefully, depending on the condition, as those combination will have inﬂuence on the fre- quency accuracy(C1, C2). s Supply pattern including decoupling capacitors needs careful attention to make the IC’s perfor- mance better, since the SM8703AV outputs sev- eral high frequency clocks. Pattern capacitance from output pins should not to be large for preven- tion of the noise. Connecting output pins to buff- ers is useful if it is necessary. s Power supply and VSS pins. • VDD : Power supply for digital block (CPU I/F, MO1, MO2) • VSS : VSS for digital block (CPU I/F, MO1, MO2) • VDDA : Power supply for PLL block (XTI, XTO, PLL/VCO) • VSSA : VSS for PLL block (XTI, XTO, PLL/VCO) • VDD1 : Power supply for output block (except SO1) • VSS1 : VSS for output block (except SO1) • VDD2 : Power supply for SO1 • VSS2 : VSS for SO1 *: CPU I/F: FSEL/MDT, MLEN, MCK NIPPON PRECISION CIRCUITS—11 11 Page

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