SM8706A Clock Generator for DVD Players NIPPON PRECISION CIRCUITS INC. OVERVIEW The SM8706A is a clock generator IC that generates 3 clocks with 6 outputs from a 36.8640MHz master clock for application in DVD players. The SM8706A has 2 built-in PLL circuits that together with a crystal oscillator can generate the 384fs and 768fs audio system clocks, 27MHz and 54MHz video system clocks, and 16.9344MHz and 33.8688MHz signal processor system clocks required for a DVD player. The SM8706A also supports the 44.1kHz and 48kHz sampling frequencies, and the sampling frequency can be switched while the device is operating. FEATURES ■ ■ ■ ■ ■ 36.8640MHz master clock (internal PLL reference clock) Generated clocks • Video system output: 27MHz, 54MHz • Audio system output: 384fs, 768fs • Signal processor system output: 16.9344MHz, 33.8688MHz Supported sampling frequency fs: 44.1/48kHz Low jitter output: 40ps (typ, 1-sigma, 25pF load) Supply voltage: 3.3V ± 0.3V 16-pin VSOP package (Top view) VDD1 1 16 SO2 MO1 FSEL MO2 VDD2 VSS2 SO1 VDD3 VSS3 XTI APPLICATIONS XTO AO2 8 9 AO1 DVD players DVD car navigation system Package SM8706AV 16-pin VSOP (Unit: mm) Weight: 0.07g + 0.1 5 0.275typ 5.1 0.2 0.0 0.15 - 0.10 0.05 Device PACKAGE DIMENSIONS 4.4 0.2 6.4 0.2 ORDERING INFORMATION 1.15 0.1 ■ ■ CE VSS1 8706AV ■ PINOUT 0 to 10 0.65 0.10 + 0.1 0.22 - 0.05 0.12 M 0.5 0.2 NIPPON PRECISION CIRCUITS—1 SM8706A BLOCK DIAGRAM FSEL XTI XTO Reference Divider 0 Phase Detector 0 Charge Pump 0 LPF 0 AO1 VCO 0 X'tal OSC AO2 Loop Divider 0 (PLL 0) Reference Divider 1 Phase Detector 1 Charge Pump 1 LPF 1 VCO 1 Control Logic SO1 SO2 Loop Divider 1 MO1 (PLL 1) MO2 CE PIN DESCRIPTION Number Name I/O Description 1 VDD1 – Supply 1 for digital block 2 VSS1 – Ground 1 for digital block 3 MO1 O Video system output 1 (27MHz fixed) 4 MO2 O Video system output 2 (54MHz fixed) 5 VDD2 – Supply 2 for analog block 6 VSS2 – Ground 2 for analog block 7 XTI I Crystal oscillator connection or external clock input 8 XTO O Crystal oscillator connection 9 AO1 O Audio system output 1 (384fs output) 10 AO2 O Audio system output 2 (768fs output) 11 VSS3 – Ground 3 for digital block 12 VDD3 – Supply 3 for digital block 13 SO1 O Signal processor system output 1 (16.9344MHz fixed) 14 FSEL I Sampling frequency select FSEL = HIGH: fs = 48kHz FSEL = LOW: fs = 44.1kHz (with internal pull-up resistor, Schmitt-trigger input) 15 SO2 O Signal processor system output 2 (33.8688MHz fixed) 16 CE I Chip enable (HIGH = Enable, LOW = Disable) NIPPON PRECISION CIRCUITS—2 SM8706A Note: Unless otherwise noted, VDD applies to VDD1, VDD2, and VDD3. Similarly, VSS applies to VSS1, VSS2, and VSS3. SPECIFICATIONS Absolute Maximum Ratings Parameter Rating Unit VDD1 , VDD2 , VDD3 − 0.3 to 6.5 V VDD1 – VDD2 , VDD1 – VDD3 , VDD2 – VDD3 ± 0.1 V VIN − 0.3 to VDD + 0.3 V VOUT − 0.3 to VDD + 0.3 V Power dissipation PD 165 mW Storage temperature range Tstg − 55 to 125 °C Supply voltage range Supply voltage deviation Input voltage range Output voltage range Symbol Condition Recommended Operating Conditions VSS = VSS1 = VSS2 = VSS3 = 0V unless otherwise noted. Rating Parameter Symbol Condition Unit min typ max + 3.0 – + 3.6 V Supply voltage ranges1, 2, 3 VDD1 , VDD2 , VDD3 Output load capacitance 1 CL1 MO1, SO1, SO2 outputs – – 25 pF Output load capacitance 2 CL2 All outputs excluding MO1, SO1, SO2, XTO – – 15 pF Master clock frequency fXTAL When using crystal oscillator – 36.8640 – MHz Operating temperature range Topr – 40 – + 85 °C 1. The supply voltage is defined relative to VSS = 0V 2. The supply voltages applied on VDD1, VDD2, and VDD3 should be derived from a common supply source. 3. If the supply voltages on VDD1, VDD2, and VDD3 are from different sources, they should be applied simultaneously. The SM8706A may be damaged if the supply voltage timing is different. DC Electrical Characteristics fXTAL = 36.8640MHz, VDD = 3.0V ± 0.3V, VSS = 0V, Ta = – 40 to 85 °C unless otherwise noted. Rating Parameter Symbol Current consumption IDD HIGH-level input voltage VIH Condition VDD = 3.3V, Ta = 25°C, fs = 48kHz, Crystal oscillator, no load on all outputs FSEL, CE, XTI, VDD = 3.3V Unit min typ max – 35 45 mA 0.8 VDD – – V – – 0.2 VDD V LOW-level input voltage VIL HIGH-level input current1 IIH1 FSEL, CE, VIN = VDD – – 1 µA LOW-level input current1 IIL1 FSEL, CE, 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 excluding XTO, IOH = − 2mA VDD − 0.4 – – V LOW-level output voltage VOL All outputs excluding XTO, IOL = 2mA – – 0.4 V 1. FSEL and CE pins have Schmitt-trigger input and built-in pull-up resistor. NIPPON PRECISION CIRCUITS—3 SM8706A AC Electrical Characteristics fXTAL = 36.8640MHz, VDD = 3.0V ± 0.3V, VSS = 0V, Ta = – 40 to 85 °C unless otherwise noted. Rating Parameter External input clock frequency1 Output clock rise time2 Output clock fall time2 Output clock jitter3 Output clock duty cycle2 Symbol fXTI tr tf tjitter (1-sigma) Dt Condition Unit min typ max XTI, applies to external clock input use only – 36.8640 – MO1, SO1, SO2, CL = 25 pF, transition between VOL = 0.2VDD and VOH = 0.8VDD – 2.0 – Outputs excluding MO1, SO1, SO2, and XTO, CL = 15pF, transition between VOL = 0.2VDD and VOH = 0.8VDD – 2.0 – MO1, SO1, SO2, CL = 25pF, transition between VOH = 0.8VDD and VOL = 0.2VDD – 2.0 – Outputs excluding MO1, SO1, SO2, and XTO, CL = 15pF, transition between VOH = 0.8VDD and VOL = 0.2VDD – 2.0 – MO1, SO1, SO2, Ta = 25°C, CL = 25pF, VO = 0.5VDD – 40 – Outputs excluding MO1, SO1, SO2, and XTO, Ta = 25°C, CL = 15pF, VO = 0.5VDD – 40 – MO1, SO1, SO2, Ta = 25°C, CL = 25pF, VO = 0.5VDD 45 50 55 Outputs excluding MO1, SO1, SO2, and XTO, Ta = 25°C, CL =15 pF, VO = 0.5VDD 45 50 55 MHz ns ns ps % Settling time2 tS All outputs excluding XTO – – 1 µs Power-up time2,4 tP All outputs excluding XTO – 1 5 ms 1. When using an external clock input, the XTI duty should be 50% with 3.3V clock signal amplitude level. The input signal voltage should not exceed the absolute maximum rating, otherwise damage may occur. 2. The numeric values are measured values obtained using the circuit in Figure 1 and the NPC standard evaluation board. 3. The numeric values are measured values obtained using the circuit in Figure 2 and the NPC standard evaluation board. 4. This is the time, after the supply is turned ON from the OFF state, until the output clock reaches ± 0.1% of the specified frequency. 36.864MHz 36.864MHz DUT Active Probe (HP1152A) Oscilloscope (Infinium HP54845A) DUT DUT:Device under testing Passive Probe (HP10435A) Frequency & Time Interval Analyzer (HP5371A) Figure 1. Measurement circuit 1 Active Probe (HP54701A) Oscilloscope (HP54720D +HP54721A) Jitter Measurement System (ASA, M1) DUT:Device under testing Figure 2. Measurement circuit 2 NIPPON PRECISION CIRCUITS—4 SM8706A FUNCTIONAL DESCRIPTION 36.8640MHz Master Clock The SM8706A 36.8640MHz master clock circuit is configured, as shown in Figure 3, with the crystal oscillator element connected between XTI (pin 7) and XTO (pin 8). Alternatively, the 36.8640MHz master clock can be supplied from an external master clock input on XTI, as shown in Figure 4. If an external input clock on XTI is used, it is recommended that the frequency be 36.8640MHz, with 50% duty, and 3.3V voltage amplitude level. Furthermore, when using an external clock input, the input signal voltage should not exceed the absolute maximum rating, otherwise damage may occur. C1 XTI (Pin 7) Internal Circuits Oscillator Control Logic XTO (Pin 8) C2 C1, C2 = 5 to 33pF MO1 (Pin 3) MO2 (Pin 4) Figure 3. Crystal oscillator connection External Clock XTI (Pin 7) Internal Circuits Oscillator Open XTO (Pin 8) Control Logic MO1 (Pin 3) MO2 (Pin 4) Figure 4. External clock input NIPPON PRECISION CIRCUITS—5 SM8706A Sampling Frequency and Output Clock Frequency The SM8706A sampling frequency fs can be switched between 44.1kHz when FSEL (pin 14) is LOW, and 48kHz when FSEL is HIGH. The audio outputs (AO1 and AO2) are a 384fs and 768fs frequency clock, respectively, where fs is determined by the setting on FSEL. In addition, the signal processor outputs (SO1 and SO2) are a 16.9344MHz and 33.8688MHz frequency clock, respectively, derived from the master clock. The video outputs (MO1 and MO2) are a 27MHz and 54MHz frequency clock, respectively, derived from the master clock. When CE (Pin16) is HIGH, the chip is enabled. When LOW, the chip is disabled. When disabled, all output go LOW and all internal circuits stop operating. When CE goes LOW to HIGH, the chip moves from disabled to enabled, the time taken until the output frequency clocks stabilize is a maximum of 5ms. The SM8706A output clock frequencies that can be selected is shown in Table 1. The output clock response timing relative to the CE setting is shown in Figure 5. Table 1. Sampling frequency and output clock frequency (36.8640MHz master clock frequency) FSEL (Pin 14) Sampling frequency fs [kHz] LOW 44.1 Output clock frequency [MHz] CE (Pin 16) AO1 (Pin 9) AO2 (Pin 10) SO1 (Pin 13) SO2 (Pin 15) MO1 (Pin 3) MO2 (Pin 4) 16.9344 33.8688 16.9344 33.8688 27.0000 54.0000 18.4320 36.8640 16.9344 33.8688 27.0000 54.0000 L L L L L L H HIGH 48 LOW 44.1 HIGH 48 L CE 5ms (max) AO1/AO2 SO1/SO2 MO1/MO2 Figure 5. CE switching response NIPPON PRECISION CIRCUITS—6 SM8706A Sampling Frequency Switching Settling Time The clock output response timing when the sampling frequency fs is switched using FSEL is shown in Figure 6. The settling time ts for the audio output clock when switching the sampling frequency is 1µs maximum. 0.8VDD FSEL 0.2VDD tS AO1 AO2 fs = 44.1kHz tS fs = 48kHz MO1 MO2 27.0000MHz /54MHz SO1 SO2 16.9344MHz /33.8688MHz fs = 44.1kHz Figure 6. Output signal switching timing NIPPON PRECISION CIRCUITS—7 SM8706A 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 for 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 export controls on the distribution or dissemination of the products. Customers shall not export, 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: +81-3-3642-6661 Facsimile: +81-3-3642-6698 http://www.npc.co.jp/ Email: [email protected] NC0012AE 2000.12 NIPPON PRECISION CIRCUITS—8