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| SM8703AV NIPPON PRECISION CIRCUITS INC. 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 builtin 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 PINOUT (Top View) s s s s s s 27 MHz master clock (internal PLL reference clock) Generated clocks * 27 MHz output * 33.8688 MHz output * 384fs output * 512fs output * 768fs output Sampling frequency fs * 44.1/48 kHz Output disable function Low jitter output: 100 ps (typ, 15pF load) Supply voltage: 3.3 V 24-pin VSOP package VDD VSS MO1 MCK MLEN VDDA VSSA XTI XTO RSV RSV SO1 1 24 12 13 MO2 FSEL/MDT SO5 RSV SO2 VDD1 VSS1 RSV SO3 SO4 VDD2 VSS2 SM8703AV APPLICATIONS s s s DVD players Set top box MPEG2 system PACKAGE DIMENSIONS (Unit: mm) 7.8 0.1 ORDERING INFORMATION D e vice S M 8 7 0 3 AV P ackag e 24-pin V S O P + 0.05 0.15 - 0.02 5.6 0.1 7.6 0.2 + 0.2 1.25 - 0.1 0 to 10 0.65 + 0.1 0.22 - 0.05 0.1 0.13 M NIPPON PRECISION CIRCUITS--1 0.1 0.1 0.5 0.2 SM8703AV BLOCK DIAGRAM FSEL/MDT MCK MLEN External Interface Phase Comparator0 Divider0 XTI Oscillator XTO Charge Pump0 SO5 LPF0 VCO0 SO4 Divider0 Divider SO3 SO2 Divider1 Phase Comparator1 Charge Pump1 LPF1 VCO1 SO1 Divider1 MO1 MO2 NIPPON PRECISION CIRCUITS--2 SM8703AV PIN DESCRIPTION Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Name VDD VSS MO1 MCK MLEN VDDA VSSA XTI X TO RSV RSV SO1 VSS2 VDD2 SO4 SO3 RSV VSS1 VDD1 SO2 RSV SO5 FSEL/MDT MO2 I/O - - O Ip 1 Ip 1 - - I O - - O - - O O - - - O - O Ip 1 O Pow er supply for Digital block VSS for Digital block 27 MHz fixed-frequency output 1 Serial interface bit clock input Serial interface latch enable input Pow er supply for Analog block VSS for Analog block Reference signal crystal oscillator element connection or external clock input Reference signal crystal oscillator element connection Reser ved (must be open) Reser ved (must be open) 33.8688 MHz fixed-frequency output VSS for Output buffer Pow er supply for Output buffer 512fs output 512fs output Reser ved (must be open) VSS for Output buffer Pow er supply for Output buffer 384fs output Reser ved (must be open) 768fs output P arallel mode: Sampling frequency select signal input Serial mode: Control data input 27 MHz fixed-frequency output 2 Description 1. Schmitt trigger input with internal pull-up resistor NIPPON PRECISION CIRCUITS--3 SM8703AV SPECIFICATIONS Absolute Maximum Ratings P arameter Supply voltage range Symbol V D DA , V DD , V DD1 , V DD2 V DDA - V DD , V DDA - V DD1 , V DDA - V DD2 , VDD - VDD1 , VDD - VDD2 , VDD1 - VDD2 VSSA - VSS , V SSA - V SS1 , V SSA - V SS2 , V SS - V SS1 , V SS - V SS2 , V SS1 - V SS2 V IN VOUT PD T stg Digital inputs Digital outputs Condition Rating -0.3 to 6.5 Unit V Supply voltage deviation 0.1 V Ground voltage deviation 0.1 V Input voltage range Output voltage range Pow er dissipation Storage temperature range -0.3 to V D D + 0.3 -0.3 to V D D + 0.3 300 -55 to 125 V V mW C Recommended Operating Conditions P arameter Supply voltage ranges Operating temperature range Symbol V D DA , V DD , V DD1 , V DD2 T opr Condition Rating 3.0 to 3.6 -40 to 85 Unit V C NIPPON PRECISION CIRCUITS--4 SM8703AV DC Electrical Characteristics External clock, Ta = -40 to 85 C, VDDA = VDD = VDD1 = VDD2 = 3.0 to 3.6 V unless otherwise stated Rating P arameter Symbol Condition min All supplies. V D D A = V D D = V D D 1 = V D D 2 = 3.3V, T a = 25 C , fs = 48 kHz, Cr ystal oscillator element, no load on all outputs XTI, FSEL/MDT, MCK, MLEN XTI, FSEL/MDT, MCK, MLEN F S E L / M D T, MCK, MLEN, V IN = V D D F S E L / M D T, MCK, MLEN, V IN = 0 V XTI, V IN = V D D XTI, V IN = 0 V All outputs. IO H = -2 m A All outputs. IO L = 4 mA typ max Unit Current consumption ID D - 32 45 mA HIGH-level input voltage L O W -level input voltage HIGH-level input current L O W -level input current HIGH-level input current L O W -level input current HIGH-level output voltage L O W -level output voltage V IH V IL IIH1 IIL1 IIH2 IIL2 VOH VOL 0.8 V D D - - - - - V D D - 0.4 - - - - - - - - - - 0.2 V D D 1 -100 40 -40 - 0.4 V V A A A A 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 Rating P arameter XTI external input clock frequency Output clock rise time Output clock fall time Symbol fM tR tF All outputs, 0.2 to 0.8V D D , C L = 15 p F All outputs, 0.8 to 0.2V D D , C L = 15 p F All outputs, Standard tolerance, Cr ystal oscillator element, C L = 15 p F All outputs, Crystal oscillator element, 1.4V to 1.4V, C L = 15 p F All outputs All outputs Condition min - - - typ 27.0000 2.0 2.0 max - - - MHz ns ns Unit Output clock jitter1 JITTER - 100 - ps Output clock duty 1 Settling time Pow er-up time 2 DUTY tS tP 45 - - 50 - 15 55 100 30 % ns ms 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 , 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 Cb L Ca R 2. Time from OFF condition to stable frequency output. NIPPON PRECISION CIRCUITS--5 SM8703AV Serial Interface AC Characteristics External clock, Ta = -40 to 85 C, VDDA = VDD = VDD1 = VDD2 = 3.0 to 3.6 V unless otherwise stated Rating P arameter MCK HIGH-level pulsewidth M C K L O W -level pulsewidth MCK pulse cycle time MDT setup time MDT hold time MLEN setup MLEN hold time 1 Symbol tM C W H tM C W L tM C Y tM D S tM D H tM L S tM L H tM H H tM L L Condition min 40 40 100 40 40 40 40 200 16 x tM C Y typ - - - - - - - - - max - - - - - - - - - ns ns ns ns ns ns ns ns ns Unit time 2 MLEN HIGH-level pulsewidth M L E N L OW -level pulsewidth 1. Time from the MLEN falling edge to the next MCK rising edge. If the MCK clock stops after the LSB, the MLEN rise timing is optional. 2. Time from MCK rising edge corresponding to the LSB to the MLEN rising edge. tMCWH tMCWL MCK tMLH tMLS 0.5VDD tMCY MDT MSB LSB 0.5VDD tMLS MLEN tMDS tMDH tMLL tMHH 0.5VDD NIPPON PRECISION CIRCUITS--6 SM8703AV FUNCTIONAL DESCRIPTION 27 MHz Master Clock The 27 MHz master clock is generated either by connecting a crystal oscillator element between XTI (pin 8) and XTO (pin 9), as shown in figure 1, or by connecting an external 27 MHz clock to XTI, as shown in figure 2. Input 27MHz master clock on XTI when using an external clock. Crystal oscillator element must be fundamental. C2 XTI (Pin8) Oscillator Internal Circuits C1 C1, C2 = 5 to 33pF XTO (Pin9) MO1 (Pin3) MO2 (Pin24) SM8703AV Figure 1. Crystal oscillator connection External Clock XTI (Pin8) Oscillator Internal Circuits Open XTO (Pin9) MO1 (Pin3) MO2 (Pin24) SM8703AV Figure 2. External clock input NIPPON PRECISION CIRCUITS--7 SM8703AV Sampling Frequency and Output Clock Frequency The SM8703AV generates several output clocks from the 27 MHz master clock, with frequencies of 384fs (SO2), 512fs (SO3, SO4) and 768fs (SO5), where fs is the sampling frequency selected by external control inputs. SO1 outputs 33.8688 MHz clock. The supported sampling frequencies are 44.1 kHz and 48 kHz, selected by the sampling frequency select pin (FSEL). The generated frequencies are shown in table 1. Table 1. Sampling frequency and output clock frequency FSEL LOW HIGH Sampling frequency fs 44.1 kHz 48 kHz Output clock frequency (MHz) SO1 33.8688 33.8688 SO2 16.9344 18.4320 SO3, SO4 22.5792 24.5760 SO5 33.8688 36.8640 Enable/Disable control 3 wire serial interface is available by using MCK(pin4), MLEN(pin5) and MDT(pin23:FSEL common) pins as serial mode. At the serial control mode, each enable (fixed as "LOW" at disable) of output frequency can be set to stop unnecessary outputs. MCK FSEL/MDT D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 MLEN Figure 3. Serial control format 16-bit mode resister (MREG) construction in Figure 4. The name and function of each bit are shown in Table 2 and 3. Set the mode-resister D15-D10 as "011100" in the serial control. MREG 0 D15 1 D14 1 D13 1 D12 0 D11 0 D10 RSV D9 CE5 D8 CE4 D7 CE3 D6 CE2 D5 CE1 D4 RSV D3 RSV D2 RSV D1 RSV D0 Note: RSV is fixed as LOW . Figure 4. Mode resister construction NIPPON PRECISION CIRCUITS--8 SM8703AV Table 2. Mode resister function Bit D9 D8 D7 D6 D5 D4 D3/D2/D1/D0 Name RSV CE5 CE4 CE3 CE2 CE1 RSV Must be "LOW " MO1, MO2 output enable/disable SO5 output enable/disable SO3, SO4 output enable/disable SO2 output enable/disable SO1 output enable/disable Must be "LOW " Function Table 3. Clock output control settings(CE5 to 1) CE5 to CE1 LOW HIGH Clock output Disable (Output fixed as "LOW") E n a ble (Default) Note Output frequency changes according to the MDT pin condition, as MDT and FSEL pin (Sampling frequency select signal input) are common. Refer to the section "Settling Time (when the sampling frequency is changed)". MCK FSEL/MDT MREG (16bit data) MLEN ts SO2 to 5 Stable Unstable Stable Figure 5. Serial transfer timing NIPPON PRECISION CIRCUITS--9 SM8703AV Settling Time (when the sampling frequency is changed) The output response when the frequency is changed is shown in figure 6. FSEL/MDT tS SO2 SO3 SO4 SO5 MO1 MO2 fs = 44.1kHz fs = 48kHz tS fs = 44.1kHz 27.0000MHz SO1 33.8688MHz Figure 6. System clock transient timing NIPPON PRECISION CIRCUITS--10 SM8703AV TYPICAL APPLICATION +3.3V CPU +3.3V 27MHz VDD C3 MO2 FSEL/MDT SO5 RSV SO2 VDD1 C5 27MHz VSS MO1 MCK MLEN VDDA C4 768fs 384fs VSSA XTI C1 C2 X'tal VSS1 RSV SO3 SO4 VDD2 C6 XTO RSV RSV SO1 512fs 512fs VSS2 SM8703AV 33.8688MHz s s s s Connect the decoupling capacitors (approximately 0.1F and 1000pF) in parallel, as close to power supply pins as possible. In order to minimize noise, it is useful to make VSS as solid pattern. Master clock stability affects the other outputs stability. 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 capacitance carefully, depending on the condition, as those combination will have influence on the frequency accuracy(C1, C2). Supply pattern including decoupling capacitors needs careful attention to make the IC's performance better, since the SM8703AV outputs several high frequency clocks. Pattern capacitance from output pins should not to be large for prevention of the noise. Connecting output pins to buffers 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 SM8703AV NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility fo r the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with expor t controls on the distribution or dissemination of the products. Customers shall not expor t, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: 03-3642-6661 Facsimile: 03-3642-6698 NIPPON PRECISION CIRCUITS INC. NC9902AE 2000.03 NIPPON PRECISION CIRCUITS--12 |
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