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AD809BR 데이터시트(PDF) 3 Page - Analog Devices |
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AD809BR 데이터시트(HTML) 3 Page - Analog Devices |
3 / 8 page AD809 REV. A –3– Table I. MUX Input Input Selected TTL “0” CLKIN/CLKINN TTL “1” PECLIN/PECLINN Table II. Applying a PECL/ECL or CMOS/TTL Reference Input to the AD809 Input Reference AD809 Configuration PECL/ECL Differential Apply the valid PECL–level reference frequency to Pins 13 and 12. AD809 frequency synthesizer ignores the input at Pin 10. TTL/CMOS Apply the reference frequency to Single-Ended Pin 10. Connect Pins 13 and 12 to AVEE (Pins 9 and 16). The AD809 senses the common-mode signal at these pins as less than valid PECL and selects the TTL/CMOS input as active. AD809 Phase Skew The AD809 output is in phase with the input. The falling edge at Pin 4, CLKOUTN, occurs 700 ps before the rising edge at Pin 10, TTL/CMOSIN at 27 °C. The phase skew remains rela- tively constant over temperature. Refer to Table III for phase skew data. Table III. Phase Skew vs. Temperature Skew (CLKOUTN, Pin 4, Relative to Temperature TTL/CMOSIN, Pin 10 Measured in ( C) ps at Package Pins) –35 –1000 –20 –950 0 –850 10 –750 30 –700 50 –600 70 –450 80 –450 90 –350 100 –250 PIN DESCRIPTIONS Pin No. Mnemonic Description 1 PECLINN Differential 155 MHz Input 2 PECLIN Differential 155 MHz Input 3VCC2 Digital VCC for PECL Outputs 4 CLKOUTN Differential 155 MHz Output 5 CLKOUT Differential 155 MHz Output 6VCC1 Digital VCC for Internal Logic 7 CF1 Loop Damping Capacitor 8 CF2 Loop Damping Capacitor 9AVEE Analog VEE 10 TTL/CMOSIN TTL/CMOS Reference Clock Input 11 AVCC1 Analog VCC for PLL 12 CLKINN PECL Differential Reference Clock Input 13 CLKIN PECL Differential Reference Clock Input 14 AVCC2 Analog VCC for Input Stage 15 MUX Input Signal Mux Control Input 16 VEE Digital VEE PIN CONFIGURATION 14 13 12 11 16 15 10 9 8 1 2 3 4 7 6 5 TOP VIEW (Not to Scale) AD809 PECLINN CLKIN AVCC2 MUX VEE PECLIN VCC2 CLKOUTN TTL/CMOSIN AVCC1 CLKINN CLKOUT VCC1 CF1 CF2 AVEE WARNING! ESD SENSITIVE DEVICE CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD809 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. |
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