SM8720AV 3-PLL Multi-Output Clock Generator OVERVIEW The SM8720AV is a clock generator IC with 3 built-in PLLs. It can simultaneously output a 27MHz master clock and three other clocks with different frequency (CLK1OUT, CLK2OUT, CLK3OUT) derived from the master clock. The 3 generated clocks can be independently turned ON/OFF using control pins and the frequency of CLK3OUT can be switched, allowing unneeded clocks within a system to be switched OFF thereby reducing current consumption. The master clock, supplied by high-stability crystal oscillator external input, allows clocks to be generated with high precision and low jitter and which require no frequency adjustment, making the SM8720AV ideal for digital still cameras and other applications which require multiple high-precision clocks. PINOUT FEATURES ■ ■ ■ ■ ■ ■ ■ 2.7 to 3.3V supply voltage 21mA typ. current consumption (VDD = 3.0V, all outputs with no load) 27MHz master clock (external input) (internal PLL reference clock) Generated clocks • 27MHz master clock (REFOUT) • 22.5792MHz (CLK1OUT) (ON/OFF switching using control pin) • 48.0000MHz (CLK2OUT) (ON/OFF switching using control pin) • 36/45/48.6MHz (CLK3OUT) (ON/OFF switching using control pin, frequency switching) Output load • 25pF (REFOUT) • 15pF (all outputs excluding REFOUT) Low jitter output • 140ps typ. peak-to-peak (REFOUT) • 220ps typ. peak-to-peak (CLK1OUT, CLK3OUT) • 220ps typ. peak-to-peak (CLK2OUT) 16-pin VSOP package (Pb free) (Top view) VDD1 1 16 REFOUT FIN 2 15 VSS3 VSS1 3 14 SEL2 CLK3OUT 4 13 CLK2_ON CLK3_ON 5 12 VDD3 SEL1 6 11 CLK2OUT CLK1_ON 7 10 VSS2 VDD2 8 9 CLK1OUT PACKAGE DIMENSIONS (Unit: mm) Weight: 0.07g ■ 4.4 0.2 6.4 0.2 APPLICATIONS Digital still cameras ORDERING INFORMATION + 0.1 0.05 Package SM8720AV 16-pin VSOP 5.1 0.2 0.15 - 0.10 0.05 Device 1.15 0.1 0.275typ 0 to 10 0.65 0.10 + 0.1 0.22 - 0.05 0.12 M 0.5 0.2 NIPPON PRECISION CIRCUITS INC.—1 SM8720AV BLOCK DIAGRAM Reference Divider 1 Phase Detector 1 Charge Pump 1 LPF 1 VCO 1 CLK1OUT Charge Pump 2 LPF 2 VCO 2 CLK2OUT Charge Pump 3 LPF 3 VCO 3 CLK3OUT FIN CLK1_ON (PLL1) Reference Divider 2 CLK2_ON SEL1 SEL2 (PLL2) Control Logic CLK3_ON Reference Divider 3 (PLL3) Loop Divider 1 Phase Detector 2 Loop Divider 2 Phase Detector 3 Loop Divider 3 REFOUT PIN DESCRIPTION Number Name I/O Description 1 VDD1 – Supply voltage 1 2 FIN I Master clock input (27MHz constant input) 3 VSS1 – Supply ground 1 4 CLK3OUT O Clock output 3 (36/45/48.6MHz switchable output) 5 CLK3_ON I Output clock enable 3 (HIGH = enable, LOW = disable) 6 SEL1 I Output select 1 7 CLK1_ON I Output clock enable 1 (HIGH = enable, LOW = disable) 8 VDD2 – Supply voltage 2 9 CLK1OUT O Clock output 1 (22.5792MHz constant output) 10 VSS2 – Supply ground 2 11 CLK2OUT O Clock output 1 (48MHz constant output) 12 VDD3 – Supply voltage 3 13 CLK2_ON I Output clock enable 3 (HIGH = enable, LOW = disable) 14 SEL2 I Output select 2 15 VSS3 – Supply ground 3 16 REFOUT O Master clock output (27MHz constant output) NIPPON PRECISION CIRCUITS INC.—2 SM8720AV ABSOLUTE MAXIMUM RATINGS VDD = (VDD1, VDD2, VDD3), VSS = (VSS1, VSS2, VSS3) unless otherwise noted. Parameter Symbol Rating Unit VDD1, VDD2, VDD3 −0.3 to 6.5 V VDD1 − VDD2, VDD1 − VDD3, VDD2 − VDD3 ±0.1 V Supply voltage range Supply voltage deviation Input voltage range Output voltage range Power dissipation Storage temperature range VIN −0.3 to VDD + 0.3 V VOUT −0.3 to VDD + 0.3 V PD 165 mW TSTG −55 to 125 °C RECOMMENDED OPERATING CONDITIONS VSS = (VSS1, VSS2, VSS3) = 0V, unless otherwise noted. Rating Parameter Symbol Conditions VDD1, VDD2, VDD3 Supply voltage*1 Unit min typ max 2.7 – 3.3 V Output load capacitance 1 CL1 REFOUT output – – 25 pF Output load capacitance 2 CL2 CLK1OUT, CLK2OUT, CLK3OUT outputs – – 15 pF Master clock frequency fFIN External clock input – 27.0000 – MHz Operating temperature TOPR −40 – +85 °C *1. The supply voltages are with reference to VSS = 0V. It is recommended that the voltages applied to pins VDD1, VDD2, VDD3 be supplied from a single source. If various voltage sources are used on pins VDD1, VDD2, VDD3, the voltage supplies should be applied simultaneously. If the timing of applying voltage supplies varies, the device may be damaged. ELECTRICAL CHARACTERISTICS DC Characteristics fFIN = 27.0000MHz, VDD = (VDD1, VDD2, VDD3) = 3.0 ± 0.3V, VSS = (VSS1, VSS2, VSS3) = 0V, Ta = −40 to +85°C unless otherwise noted. Rating Parameter Current consumption Symbol IDD VDD VIH FIN, SEL1, SEL2, CLK1_ON, CLK2_ON, CLK3_ON*1,*2 Input voltage VIL IIH1 Input current IIL1 IIH2 IIL2 Output voltage Pins VOH VOL CLK1_ON, CLK2_ON, CLK3_ON*1 FIN, SEL1, SEL2*2 All outputs Conditions Unit min typ max – 21 28 mA 0.8VDD – – V – – 0.2VDD V VIN = VDD – 30 80 µA VIN = 0V −1 – – µA VIN = VDD – – 1 µA VIN = 0V −1 – – µA VDD = 3.0V, Ta = 25°C, all outputs operating without load VDD = 3.0V IOH = −2mA IOL = 2mA VDD − 0.4 – – V – – 0.4 V *1. CLK1_ON, CLK2_ON, CLK3_ON pins have Schmitt-trigger inputs with internal pull-down resistance. *2. SEL1, SEL2 pins have Schmitt-trigger inputs. NIPPON PRECISION CIRCUITS INC.—3 SM8720AV AC Characteristics fFIN = 27.0000MHz, VDD = (VDD1, VDD2, VDD3) = 3.0 ± 0.3V, VSS = (VSS1, VSS2, VSS3) = 0V, Ta = −40 to +85°C unless otherwise noted. Rating Parameter Symbol Pins Conditions Unit min typ max External input clock frequency fFIN FIN External clock input – 27.0000 – MHz External clock duty cycle*1 DtFIN FIN Ta = 25°C, VI = 0.5VDD, external clock input 45 50 55 % REFOUT CL = 25pF, VOL = 0.2VDD to VOH = 0.8VDD transition – – 3.0 ns All outputs excluding REFOUT CL = 15pF, VOL = 0.2VDD to VOH = 0.8VDD transition – – 4.0 ns REFOUT CL = 25pF, VOH = 0.8VDD to VOL = 0.2VDD transition – – 3.0 ns All outputs excluding REFOUT CL = 15pF, VOH = 0.8VDD to VOL = 0.2VDD transition – – 4.0 ns REFOUT Ta = 25°C, CL = 25pF, VO = 0.5VDD – 140 200 ps CLK1OUT, CLK3OUT Ta = 25°C, CL = 15pF, VO = 0.5VDD – 220 350 ps CLK2OUT Ta = 25°C, CL = 15pF, VO = 0.5VDD – 220 500 ps REFOUT*2,*5 Ta = 25°C, CL = 25pF, VO = 0.5VDD 45 50 55 % All outputs excluding REFOUT*2 Ta = 25°C, CL = 15pF, VO = 0.5VDD 45 50 55 % – 1 5 ms Output clock rise time*2 Output clock fall time*2 Output clock jitter (peak-to-peak)*3,*4 Output clock duty cycle Power-up time*2,*6 tr tf tjitter Dt tP All outputs excluding REFOUT *1. When using an external clock input, it is recommended that FIN duty cycle = 50%, clock signal amplitude = VDD level. Note that the input signal voltage amplitude should not exceed the absolute maximum rating, otherwise the device may be damaged. *2. Measured using the circuit shown in figure 1 on the NPC standard evaluation board. *3. Measured using the circuit shown in figure 2 on the NPC standard evaluation board. *4. Measured using master clock input on FIN with ≤80ps (peak-to-peak) jitter. *5. Measured using master clock input on FIN with duty cycle = 50%, clock signal amplitude = VDD level. *6. The power-up time is the time from supply OFF/ON transition or enable LOW/HIGH transition until each output clock reaches its designated frequency to within ±0.1%. 27MHz 27MHz DUT Active Probe (HP1152A) DUT:Device under test Passive Probe (HP10435A) Oscilloscope (Infinium HP54845A) Frequency & Time Interval Analyzer (HP5371A) Figure 1. Measurement circuit 1 Active Probe (HP54701A) DUT Oscilloscope (HP54720D +HP54721A) Jitter Measurement System (ASA, M1) DUT:Device under test Figure 2. Measurement circuit 2 NIPPON PRECISION CIRCUITS INC.—4 SM8720AV FUNCTIONAL DESCRIPTION 27MHz Master Clock The 27MHz master clock is an external clock input on pin FIN as shown in figure 3. It is recommended that the master clock have 27.0000MHz frequency, 50% duty, and VDD level amplitude. Note that the FIN input clock amplitude voltage level should not exceed the absolute maximum rating, otherwise the device may be damaged. External Clock FIN (Pin 2) Internal Circuits REFOUT (Pin 16) Figure 3. External clock input Output Clock Frequency The SM8720AV generates 3 output clocks with frequency 22.5792MHz (CLK1OUT), 48MHz (CLK2OUT), and 36/45/48.6MHz (CLK3OUT), derived from the master clock. In addition, the 27MHz master clock is output on REFOUT. A list of the supported clock frequency and control settings is shown in table 1. Table 1. Output clock frequency (27.0000MHz master clock frequency) Output clock frequency [MHz] CLK3OUT (Pin 4) CLK1_ON (Pin 7) CLK2_ON (Pin 13) CLK3_ON (Pin 5) H REFOUT (Pin 16) CLK1OUT (Pin 9) CLK2OUT (Pin 11) SEL1 = H (Pin 6) SEL2 = L (Pin 14) SEL1 = L (Pin 6) SEL2 = L (Pin 14) SEL1 = L (Pin 6) SEL2 = H (Pin 14) 27.0000 22.5792 48.0000 36.0000 45.0000 48.6000 27.0000 L 48.0000 36.0000 45.0000 48.6000 27.0000 22.5792 L 36.0000 45.0000 48.6000 27.0000 L L 36.0000 45.0000 48.6000 27.0000 22.5792 48.0000 L L L 27.0000 L 48.0000 L L L 27.0000 22.5792 L L L L 27.0000 L L L L L H L H H L L H H L L H L L NIPPON PRECISION CIRCUITS INC.—5 SM8720AV 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. Customer are requested to obtain prior written agreement for such use from NIPPON PRECISION CIRCUITS INC. (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 documents 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. 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] NC0119AE 2002.07 NIPPON PRECISION CIRCUITS INC.—6