SM8703AV Clock Generator for MPEG2 System NIPPON PRECISION CIRCUITS INC. 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 ■ ■ ■ ■ ■ ■ 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 (Top View) VDD VSS MO1 MCK MLEN VDDA VSSA XTI XTO RSV RSV SO1 1 24 SM8703AV ■ PINOUT 12 13 MO2 FSEL/MDT SO5 RSV SO2 VDD1 VSS1 RSV SO3 SO4 VDD2 VSS2 APPLICATIONS PACKAGE DIMENSIONS P ackag e S M 8 7 0 3 AV 24-pin V S O P + 0.05 0.15 − 0.02 7.8 ± 0.1 0.5 ± 0.2 D e vice (Unit: mm) 7.6 ± 0.2 ORDERING INFORMATION + 0.2 1.25 − 0.1 ■ DVD players Set top box MPEG2 system 0.65 0.1 + 0.1 0.22 − 0.05 0 to 10 0.1 ± 0.1 ■ 5.6 ± 0.1 ■ 0.13 M NIPPON PRECISION CIRCUITS—1 SM8703AV BLOCK DIAGRAM FSEL/MDT MCK MLEN External Interface Divider0 XTI Phase Comparator0 Charge Pump0 SO5 LPF0 VCO0 Oscillator SO4 XTO Divider Divider0 SO3 SO2 Divider1 Phase Comparator1 Charge Pump1 LPF1 VCO1 SO1 Divider1 MO1 MO2 NIPPON PRECISION CIRCUITS—2 SM8703AV PIN DESCRIPTION Number Name I/O 1 VDD – Pow er supply for Digital block 2 VSS – VSS for Digital block 3 MO1 O 27 MHz fixed-frequency output 1 MCK Ip 1 Serial interface bit clock input 5 MLEN Ip 1 Serial interface latch enable input 6 VDDA – Pow er supply for Analog block 7 VSSA – VSS for Analog block 8 XTI I Reference signal crystal oscillator element connection or external clock input 9 X TO O Reference signal crystal oscillator element connection 10 RSV – Reser ved (must be open) 11 RSV – Reser ved (must be open) 12 SO1 O 33.8688 MHz fixed-frequency output 13 VSS2 – VSS for Output buffer 14 VDD2 – Pow er supply for Output buffer 15 SO4 O 512fs output 16 SO3 O 512fs output 17 RSV – Reser ved (must be open) 18 VSS1 – VSS for Output buffer 19 VDD1 – Pow er supply for Output buffer 20 SO2 O 384fs output 21 RSV – Reser ved (must be open) 22 SO5 O 768fs output 23 FSEL/MDT Ip 1 P arallel mode: Sampling frequency select signal input Serial mode: Control data input 24 MO2 O 27 MHz fixed-frequency output 2 4 Description 1. Schmitt trigger input with internal pull-up resistor NIPPON PRECISION CIRCUITS—3 SM8703AV SPECIFICATIONS Absolute Maximum Ratings P arameter Rating Unit V D DA , V DD , V DD1 , V DD2 −0.3 to 6.5 V Supply voltage deviation V DDA – V DD , V DDA – V DD1 , V DDA – V DD2 , VDD – VDD1 , VDD – VDD2 , VDD1 – VDD2 ±0.1 V Ground voltage deviation VSSA – VSS , V SSA – V SS1 , V SSA – V SS2 , V SS – V SS1 , V SS – V SS2 , V SS1 – V SS2 ±0.1 V Supply voltage range Input voltage range Output voltage range Symbol Condition V IN Digital inputs −0.3 to V D D + 0.3 V VOUT Digital outputs −0.3 to V D D + 0.3 V Pow er dissipation PD 300 mW Storage temperature range T stg −55 to 125 °C Rating Unit V D DA , V DD , V DD1 , V DD2 3.0 to 3.6 V T opr –40 to 85 °C Recommended Operating Conditions P arameter Supply voltage ranges Operating temperature range Symbol Condition 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 Unit min typ max – 32 45 mA Current consumption ID D 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 HIGH-level input voltage V IH XTI, FSEL/MDT, MCK, MLEN 0.8 V D D – – V L O W -level input voltage V IL XTI, FSEL/MDT, MCK, MLEN – – 0.2 V D D V HIGH-level input current IIH1 F S E L / M D T, MCK, MLEN, V IN = V D D – – 1 µA L O W -level input current IIL1 F S E L / M D T, MCK, MLEN, V IN = 0 V – – −100 µA HIGH-level input current IIH2 XTI, V IN = V D D – – 40 µA L O W -level input current IIL2 XTI, V IN = 0 V – – −40 µA HIGH-level output voltage VOH All outputs. IO H = −2 m A V D D − 0.4 – – V L O W -level output voltage VOL All outputs. IO L = 4 mA – – 0.4 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 Symbol Condition Unit min typ max – 27.0000 – MHz XTI external input clock frequency fM Output clock rise time tR All outputs, 0.2 to 0.8V D D , C L = 15 p F – 2.0 – ns Output clock fall time tF All outputs, 0.8 to 0.2V D D , C L = 15 p F – 2.0 – ns Output clock jitter1 JITTER All outputs, Standard tolerance, Cr ystal oscillator element, C L = 15 p F – 100 – ps Output clock duty 1 DUTY All outputs, Crystal oscillator element, 1.4V to 1.4V, C L = 15 p F 45 50 55 % tS All outputs – – 100 ns tP All outputs – 15 30 ms Settling time Pow er-up time 2 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 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 Symbol Condition Unit min typ max MCK HIGH-level pulsewidth tM C W H 40 – – ns M C K L O W -level pulsewidth tM C W L 40 – – ns MCK pulse cycle time tM C Y 100 – – ns MDT setup time tM D S 40 – – ns MDT hold time tM D H 40 – – ns MLEN setup time 1 tM L S 40 – – ns time 2 tM L H 40 – – ns MLEN HIGH-level pulsewidth tM H H 200 – – ns M L E N L OW -level pulsewidth tM L L 16 × tM C Y – – ns MLEN hold 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 tMLH tMLS MCK 0.5VDD tMCY MDT MSB LSB tMLS tMDS tMDH tMLL 0.5VDD tMHH MLEN 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) Internal Circuits Oscillator XTO (Pin9) C1 C1, C2 = 5 to 33pF MO1 (Pin3) MO2 (Pin24) SM8703AV Figure 1. Crystal oscillator connection External Clock XTI (Pin8) Oscillator Open Internal Circuits 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 Output clock frequency (MHz) Sampling frequency fs FSEL SO1 SO2 SO3, SO4 SO5 LOW 44.1 kHz 33.8688 16.9344 22.5792 33.8688 HIGH 48 kHz 33.8688 18.4320 24.5760 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 1 1 1 0 0 RSV CE5 CE4 CE3 CE2 CE1 RSV RSV RSV RSV D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Note: RSV is fixed as LOW . Figure 4. Mode resister construction NIPPON PRECISION CIRCUITS—8 SM8703AV Table 2. Mode resister function Bit Name Function D9 RSV Must be "LOW " D8 CE5 MO1, MO2 output enable/disable D7 CE4 SO5 output enable/disable D6 CE3 SO3, SO4 output enable/disable D5 CE2 SO2 output enable/disable D4 CE1 SO1 output enable/disable D3/D2/D1/D0 RSV Must be "LOW " Table 3. Clock output control settings(CE5 to 1) CE5 to CE1 Clock output LOW Disable (Output fixed as "LOW") HIGH 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 MREG (16bit data) FSEL/MDT 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 fs = 44.1kHz tS fs = 48kHz MO1 MO2 27.0000MHz SO1 33.8688MHz fs = 44.1kHz Figure 6. System clock transient timing NIPPON PRECISION CIRCUITS—10 SM8703AV TYPICAL APPLICATION +3.3V +3.3V CPU 27MHz VDD MO2 27MHz C3 VSS FSEL/MDT MO1 SO5 MCK RSV MLEN SO2 VDDA VDD1 VSSA VSS1 768fs 384fs C5 C4 C1 XTI RSV XTO SO3 512fs RSV SO4 512fs RSV VDD2 SO1 VSS2 X'tal C2 C6 SM8703AV 33.8688MHz ■ ■ ■ ■ Connect the decoupling capacitors (approximately 0.1µF 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. ■ 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. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: 03-3642-6661 Facsimile: 03-3642-6698 NC9902AE 2000.03 NIPPON PRECISION CIRCUITS—12