SM8703CV Clock Generator for DVD Players OVERVIEW The SM8703CV is a 27MHz master clock, 5-system output clock generator for DVD players. 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 systems, plus independent fixed-frequency 27MHz and 33.8688MHz output clocks. Each output has an output disable function, when the output is not used, to suppress unwanted radiation. Also, the normal output frequency ratio between each output is maintained so that the visual and audio signals remain synchronized. Supported sampling frequencies (fs) include 44.1 and 48kHz. FEATURES APPLICATIONS ■ ■ ■ DVD players Set-top boxes MPEG2 systems 24 12 13 MO2 FSEL/MDT SO5 RSV SO2 VDD1 VSS1 RSV SO3 SO4 VDD2 VSS2 PACKAGE DIMENSIONS ORDERING INFORMATION Device Package SM8703CV 24-pin VSOP (Unit: mm) Weight: 0.1g + 0.05 0.15 − 0.02 7.8 ± 0.1 0.5 ± 0.2 ■ ■ 1 7.6 ± 0.2 ■ ■ VDD VSS MO1 MCK MLEN VDDA VSSA XTI XTO RSV RSV SO1 + 0.2 1.25 − 0.1 ■ (Top view) 0.65 0.1 + 0.1 0.22 − 0.05 0 to 10 0.1 ± 0.1 ■ 27MHz master clock (internal PLL reference clock) Generated clocks • 27MHz output • 33.8688MHz output • 384fs output • 512fs output • 768fs output Sampling frequency fs • 44.1/48kHz Output disable function Low jitter output: 100ps (typ, 15pF load) Supply voltage: 3.3V 24-pin VSOP package 5.6 ± 0.1 ■ PINOUT 0.13 M SEIKO NPC CORPORATION —1 SM8703CV BLOCK DIAGRAM FSEL/MDT MCK MLEN External Interface Divider0 Phase Comparator0 XTI Charge Pump0 SO5 LPF0 VCO0 Oscillator SO4 XTO Divider Divider0 SO3 SO2 Divider1 Phase Comparator1 Charge Pump1 LPF1 VCO1 SO1 Divider1 MO1 MO2 SEIKO NPC CORPORATION —2 SM8703CV PIN DESCRIPTION Number Name I/O 1 VDD – Power supply for Digital block 2 VSS – VSS for Digital block 3 MO1 O 27MHz fixed-frequency output 1 MCK Ip1 Serial interface bit clock input 5 MLEN Ip1 Serial interface latch enable input 6 VDDA – Power supply for Analog block 7 VSSA – VSS for Analog block 8 XTI I Reference signal crystal oscillator element connection or external clock input 9 XTO O Reference signal crystal oscillator element connection 10 RSV – Reserved (must be open) 11 RSV – Reserved (must be open) 12 SO1 O 33.8688MHz fixed-frequency output 13 VSS2 – VSS for Output buffer 14 VDD2 – Power supply for Output buffer 15 SO4 O 512fs output 16 SO3 O 512fs output 17 RSV – Reserved (must be open) 18 VSS1 – VSS for Output buffer 19 VDD1 – Power supply for Output buffer 20 SO2 O 384fs output 21 RSV – Reserved (must be open) 22 SO5 O 768fs output 23 FSEL/MDT Ip1 Parallel mode: Sampling frequency select signal input Serial mode: Control data input 24 MO2 O 27MHz fixed-frequency output 2 4 Description 1. Schmitt trigger input with internal pull-up resistor SEIKO NPC CORPORATION —3 SM8703CV SPECIFICATIONS Absolute Maximum Ratings Parameter Rating Unit VDDA , VDD , VDD1 , VDD2 −0.3 to 6.5 V Supply voltage deviation VDDA – VDD , VDDA – VDD1 , VDDA – VDD2 , VDD – VDD1 , VDD – VDD2 , VDD1 – VDD2 ±0.1 V Ground voltage deviation VSSA – VSS , VSSA – VSS1 , VSSA – VSS2 , VSS – VSS1 , VSS – VSS2 , VSS1 – VSS2 ±0.1 V Supply voltage range Input voltage range Output voltage range Symbol Condition VIN Digital inputs −0.3 to VDD + 0.3 V VOUT Digital outputs −0.3 to VDD + 0.3 V Power dissipation PD 300 mW Storage temperature range Tstg −55 to 125 °C Rating Unit VDDA , VDD , VDD1 , VDD2 3.0 to 3.6 V Topr –40 to 85 °C Recommended Operating Conditions Parameter Supply voltage ranges Operating temperature range Symbol Condition SEIKO NPC CORPORATION —4 SM8703CV DC Electrical Characteristics External clock, Ta = –40 to 85°C, VDDA = VDD = VDD1 = VDD2 = 3.0 to 3.6V unless otherwise noted. Rating Parameter Symbol Condition Unit min typ max – 32 45 mA Current consumption IDD All supplies. VDDA = VDD = VDD1 = VDD2 = 3.3V, Ta = 25°C, fs = 48kHz, Crystal oscillator element, no load on all outputs HIGH-level input voltage VIH XTI, FSEL/MDT, MCK, MLEN 0.8VDD – – V LOW-level input voltage VIL XTI, FSEL/MDT, MCK, MLEN – – 0.2VDD V HIGH-level input current IIH1 FSEL/MDT, MCK, MLEN (Note 1) VIN = VDD – – 1 µA LOW-level input current IIL1 FSEL/MDT, MCK, MLEN (Note 1) VIN = 0V – – −100 µA HIGH-level input current IIH2 XTI, VIN = VDD – – 40 µA LOW-level input current IIL2 XTI, VIN = 0V – – −40 µA HIGH-level output voltage VOH All outputs. IOH = −2mA VDD − 0.4 – – V LOW-level output voltage VOL All outputs. IOL = 4mA – – 0.4 V Note 1: Schmitt trigger input with internal pull-up resistor AC Electrical Characteristics External clock, Ta = –40 to 85°C, VDDA = VDD = VDD1 = VDD2 = 3.0 to 3.6V unless otherwise noted. Rating Parameter 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 0.8VDD , CL = 15pF – 2.0 – ns Output clock fall time tF All outputs, 0.8 to 0.2VDD , CL = 15pF – 2.0 – ns Output clock jitter JITTER All outputs, Standard tolerance, Crystal oscillator element, CL = 15pF – 100 – ps Output clock duty1 DUTY All outputs, Crystal oscillator element, CL = 15pF 45 50 55 % Settling time tS All outputs – – 100 ns Power-up time2 tP All outputs – 15 30 ms 1. 1.4V to 1.4V. Ta = 20°C. The characteristics of output clock jitter and output clock duty depends on crystal oscillator. NPC’s standard crystal oscillator: R = 10.5Ω, L = 5.38mH, Ca = 6.74fF, Cb = 1.85pF measurement apparatus: HP4195 Load capacitance: C1 = 7pF, C2 = 11pF Cb L Ca R 2. Time from OFF condition to stable frequency output. SEIKO NPC CORPORATION —5 SM8703CV Serial Interface AC Characteristics External clock, Ta = –40 to 85°C, VDDA = VDD = VDD1 = VDD2 = 3.0 to 3.6V unless otherwise noted. Rating Parameter Symbol Condition Unit min typ max MCK HIGH-level pulsewidth tMCWH 40 – – ns MCK LOW-level pulsewidth tMCWL 40 – – ns MCK pulse cycle time tMCY 100 – – ns MDT setup time tMDS 40 – – ns MDT hold time tMDH 40 – – ns MLEN setup time1 tMLS 40 – – ns MLEN hold time2 tMLH 40 – – ns MLEN HIGH-level pulsewidth tMHH 200 – – ns MLEN LOW-level pulsewidth tMLL 16 × tMCY – – ns 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 0.5VDD tMDH tMLL tMHH MLEN 0.5VDD SEIKO NPC CORPORATION —6 SM8703CV FUNCTIONAL DESCRIPTION 27MHz Master Clock The 27MHz 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 27MHz clock to XTI, as shown in figure 2. The crystal oscillator element must be used in fundamental frequency mode. C2 XTI (Pin8) Internal Circuits Oscillator XTO (Pin9) C1 C1, C2 = 5 to 33pF MO1 (Pin3) MO2 (Pin24) SM8703CV Figure 1. Crystal oscillator connection External Clock XTI (Pin8) Oscillator Open Internal Circuits XTO (Pin9) MO1 (Pin3) MO2 (Pin24) SM8703CV Figure 2. External clock input SEIKO NPC CORPORATION —7 SM8703CV Sampling Frequency and Output Clock Frequency The SM8703CV generates several output clocks from the 27MHz 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 a 33.8688MHz clock. The supported sampling frequencies are 44.1kHz and 48kHz, 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 44.1kHz 33.8688 16.9344 22.5792 33.8688 HIGH 48kHz 33.8688 18.4320 24.5760 36.8640 Enable/Disable control A 3-wire serial interface is provided using MCK (pin 4), MLEN (pin 5), and MDT (pin 23, MDT/FSEL). Using serial control, each output frequency can be enabled (disabled when LOW) individually, or disabled to prevent unwanted output. 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 The 16-bit mode register (MREG) is shown in Figure 4. The name and function of each bit are shown in Tables 2 and 3. Serial control is enabled by setting D15-D10 to "011100". MREG 0 1 1 1 0 0 D15 D14 D13 D12 D11 D10 RSV CE5 D9 D8 CE4 CE3 CE2 CE1 RSV RSV RSV RSV D7 D6 D5 D4 D3 D2 D1 D0 Note: RSV is fixed LOW. Figure 4. Mode register SEIKO NPC CORPORATION —8 SM8703CV Table 2. Mode register function Bit Name Function D9 RSV Must be "LOW" D8 CE5 SO2 output enable/disable D7 CE4 SO3, SO4 output enable/disable D6 CE3 SO5 output enable/disable D5 CE2 SO1 output enable/disable D4 CE1 MO1, MO2 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 "LOW") HIGH Enable (Default) Note The output frequency changes depending on the MDT pin function (as MDT and FSEL, the sampling frequency select signal input, share a common pin). 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 SEIKO NPC CORPORATION —9 SM8703CV 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 SEIKO NPC CORPORATION —10 SM8703CV 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 SM8703CV 33.8688MHz ■ ■ ■ ■ Connect the decoupling capacitors (approximately 0.1µF and 1000pF) in parallel, as close to the power supply pins as possible. A solid VSS pattern beneath the IC should be used to minimize noise. Master clock stability affects the stability of the other outputs. If a crystal oscillator is used, the oscillator element and load capacitors should be placed as close to the SM8703CV as possible, and connected with wires as short as possible. The crystal oscillator element and load capacitor combination has an effect on frequency accuracy, and the load capacitors (C1, C2) should be selected to match the required application. The SM8703CV outputs several high-frequency clocks, so the supply wiring pattern (including decoupling capacitors) should be considered carefully. In particular, the output supply wiring and PLL supply wiring should separated to prevent noise insertion. The output wiring capacitance should be minimized as much as possible to prevent noise. If necessary, the output clocks can be buffered. ■ 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 SEIKO NPC CORPORATION —11 SM8703CV Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter “Products”) are not intended to be used for the apparatus that exerts harmful influence on human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such use from SEIKO NPC CORPORATION (hereinafter “NPC”). Customers shall be solely responsible for, and indemnify and hold NPC free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. SEIKO NPC CORPORATION 15-6, Nihombashi-kabutocho, Chuo-ku, Tokyo 103-0026, Japan Telephone: +81-3-6667-6601 Facsimile: +81-3-6667-6611 http://www.npc.co.jp/ Email: [email protected] NC0113BE 2006.04 SEIKO NPC CORPORATION —12