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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.
FEATURES
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PINOUT
(Top view)
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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)
VDD1 FIN VSS1 CLK3OUT CLK3_ON SEL1 CLK1_ON VDD2
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
REFOUT VSS3 SEL2 CLK2_ON VDD3 CLK2OUT VSS2 CLK1OUT
PACKAGE DIMENSIONS
(Unit: mm) Weight: 0.07g
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Digital still cameras
ORDERING INFORMATION
Device SM8720AV Package 16-pin VSOP
0.65
4.4 0.2 6.4 0.2
APPLICATIONS
0.10 0.05
5.1 0.2
1.15 0.1
0.275typ
0.15 -
+ 0.1 5 0.0
0 to 10 0.10 0.22 - 0.05
+ 0.1
0.12 M
0.5 0.2
NIPPON PRECISION CIRCUITS INC.--1
SM8720AV
BLOCK DIAGRAM
Reference Divider 1 FIN CLK1_ON
Phase Detector 1
Charge Pump 1
LPF 1
VCO 1
CLK1OUT
(PLL1)
Loop Divider 1
Reference Divider 2
Phase Detector 2
Charge Pump 2
LPF 2
VCO 2
CLK2OUT
CLK2_ON
(PLL2)
Loop Divider 2
SEL1 SEL2
Control Logic
Reference Divider 3
Phase Detector 3
Charge Pump 3
LPF 3
VCO 3
CLK3OUT
CLK3_ON
(PLL3)
Loop Divider 3 REFOUT
PIN DESCRIPTION
Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name VDD1 FIN VSS1 CLK3OUT CLK3_ON SEL1 CLK1_ON VDD2 CLK1OUT VSS2 CLK2OUT VDD3 CLK2_ON SEL2 VSS3 REFOUT I/O - I - O I I I - O - O - I I - O Supply voltage 1 Master clock input (27MHz constant input) Supply ground 1 Clock output 3 (36/45/48.6MHz switchable output) Output clock enable 3 (HIGH = enable, LOW = disable) Output select 1 Output clock enable 1 (HIGH = enable, LOW = disable) Supply voltage 2 Clock output 1 (22.5792MHz constant output) Supply ground 2 Clock output 1 (48MHz constant output) Supply voltage 3 Output clock enable 3 (HIGH = enable, LOW = disable) Output select 2 Supply ground 3 Master clock output (27MHz constant output) Description
NIPPON PRECISION CIRCUITS INC.--2
SM8720AV
ABSOLUTE MAXIMUM RATINGS
VDD = (VDD1, VDD2, VDD3), VSS = (VSS1, VSS2, VSS3) unless otherwise noted.
Parameter Supply voltage range Supply voltage deviation Input voltage range Output voltage range Power dissipation Storage temperature range Symbol VDD1, VDD2, VDD3 VDD1 - VDD2, VDD1 - VDD3, VDD2 - VDD3 VIN VOUT PD TSTG Rating -0.3 to 6.5 0.1 -0.3 to VDD + 0.3 -0.3 to VDD + 0.3 165 -55 to 125 Unit V V V V mW C
RECOMMENDED OPERATING CONDITIONS
VSS = (VSS1, VSS2, VSS3) = 0V, unless otherwise noted.
Rating Parameter Supply voltage*1 Output load capacitance 1 Output load capacitance 2 Master clock frequency Operating temperature Symbol VDD1, VDD2, VDD3 CL1 CL2 fFIN TOPR REFOUT output CLK1OUT, CLK2OUT, CLK3OUT outputs External clock input Conditions min 2.7 - - - -40 typ - - - 27.0000 - max 3.3 25 15 - +85 V pF pF MHz C Unit
*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 +85C unless otherwise noted.
Rating Parameter Current consumption Symbol IDD VIH Input voltage VIL IIH1 Input current IIL1 IIH2 IIL2 Output voltage VOH VOL Pins VDD FIN, SEL1, SEL2, CLK1_ON, CLK2_ON, CLK3_ON*1,*2 CLK1_ON, CLK2_ON, CLK3_ON*1 FIN, SEL1, SEL2*2 All outputs Conditions min VDD = 3.0V, Ta = 25C, all outputs operating without load - 0.8VDD VDD = 3.0V - VIN = VDD VIN = 0V VIN = VDD VIN = 0V IOH = -2mA IOL = 2mA - -1 - -1 VDD - 0.4 - - 30 - - - - - 0.2VDD 80 - 1 - - 0.4 V A A A A V V typ 21 - max 28 - mA V Unit
*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 +85C unless otherwise noted.
Rating Parameter External input clock frequency External clock duty cycle*1 Symbol Pins Conditions min fFIN DtFIN FIN FIN REFOUT Output clock rise time*2 tr All outputs excluding REFOUT REFOUT Output clock fall time*2 tf All outputs excluding REFOUT REFOUT Output clock jitter (peak-to-peak)*3,*4 tjitter CLK1OUT, CLK3OUT CLK2OUT REFOUT*2,*5 Output clock duty cycle Dt All outputs excluding REFOUT*2 Power-up time*2,*6 tP All outputs excluding REFOUT External clock input Ta = 25C, VI = 0.5VDD, external clock input CL = 25pF, VOL = 0.2VDD to VOH = 0.8VDD transition CL = 15pF, VOL = 0.2VDD to VOH = 0.8VDD transition CL = 25pF, VOH = 0.8VDD to VOL = 0.2VDD transition CL = 15pF, VOH = 0.8VDD to VOL = 0.2VDD transition Ta = 25C, CL = 25pF, VO = 0.5VDD Ta = 25C, CL = 15pF, VO = 0.5VDD Ta = 25C, CL = 15pF, VO = 0.5VDD Ta = 25C, CL = 25pF, VO = 0.5VDD Ta = 25C, CL = 15pF, VO = 0.5VDD - 45 - - - - - - - 45 45 - typ 27.0000 50 - - - - 140 220 220 50 50 1 max - 55 3.0 4.0 3.0 4.0 200 350 500 55 55 5 MHz % ns ns ns ns ps ps ps % % ms Unit
*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)
Oscilloscope (Infinium HP54845A) Frequency & Time Interval Analyzer (HP5371A)
DUT
Active Probe (HP54701A)
DUT:Device under test Passive Probe (HP10435A)
Oscilloscope (HP54720D +HP54721A)
Jitter Measurement System (ASA, M1)
DUT:Device under test
Figure 1. Measurement circuit 1
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) REFOUT (Pin 16) CLK1OUT (Pin 9) CLK2OUT (Pin 11) SEL1 = H (Pin 6) SEL2 = L (Pin 14) 36.0000 36.0000 36.0000 36.0000 L L L L SEL1 = L (Pin 6) SEL2 = L (Pin 14) 45.0000 45.0000 45.0000 45.0000 L L L L SEL1 = L (Pin 6) SEL2 = H (Pin 14) 48.6000 48.6000 48.6000 48.6000 L L L L
H H L H H L L H H L L H L L
27.0000 27.0000 27.0000 27.0000 27.0000 27.0000 27.0000 27.0000
22.5792 L 22.5792 L 22.5792 L 22.5792 L
48.0000 48.0000 L L 48.0000 48.0000 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: sales@npc.co.jp
NC0119AE 2002.07
NIPPON PRECISION CIRCUITS INC.--6

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