ad8465 Analog Devices, Inc., ad8465 Datasheet
ad8465
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ad8465 Summary of contents
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... Pulse-width modulators Current-/voltage-controlled oscillators Automatic test equipment (ATE) Automotive GENERAL DESCRIPTION The AD8465 is a very fast comparator fabricated on the Analog Devices, Inc., proprietary XFCB2 process. This comparator is exceptionally versatile and easy to use. Features include an input range from V − 0 0.2 V, low noise, LVDS- ...
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... AD8465 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Electrical Characteristics ............................................................. 3 Timing Information ......................................................................... 5 Absolute Maximum Ratings ............................................................ 6 Thermal Resistance ...................................................................... 6 ESD Caution .................................................................................. 6 Pin Configuration and Function Descriptions ............................. 7 Typical Performance Characteristics ............................................. 8 REVISION HISTORY 4/09—Revision 0: Initial Version Application Information ................................................................ 10 Power/Ground Layout and Bypassing ..................................... 10 LVDS-Compatible Output Stage ...
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... 2 5.0 V CCO 100 Ω OD LOAD R = 100 Ω LOAD 100 Ω OCI LOAD 100 Ω OC (p-p) LOAD Rev Page AD8465 Min Typ Max Unit −0 0.2 V CCI −0 0.2 V CCI V V CCI −5.0 +5.0 mV −5.0 ±2 +5.0 μA − ...
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... AD8465 Parameter 1 AC PERFORMANCE Rise Time/Fall Time Propagation Delay Propagation Delay Skew—Rising to Falling Transition Propagation Delay Skew— Overdrive Dispersion Common-Mode Dispersion Input Bandwidth Minimum Pulse Width POWER SUPPLY Input Supply Voltage Range Output Supply Voltage Range Positive Supply Differential ...
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... TIMING INFORMATION Figure 2 illustrates the AD8465 latch timing relationships. Table 2 provides definitions of the terms shown in Figure 2. LATCH ENABLE DIFFERENTIAL INPUT VOLTAGE Q OUTPUT Q OUTPUT Table 2. Timing Descriptions Symbol Timing t Input-to-Output High Delay PDH t Input-to-Output Low Delay PDL t Latch Enable-to-Output High Delay ...
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... AD8465 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Supply Voltages Input Supply Voltage (V to GND) CCI Output Supply Voltage (V to GND) CCO Positive Supply Differential (V − V CCI CCO Input Voltages Input Voltage Differential Input Voltage Maximum Input/Output Current Shutdown Control Pin Applied Voltage (S ...
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... (Not to Scale) NOTES 1. FOR BEST THERMAL PERFORMANCE, EXPOSED PAD MUST BE SOLDERED TO THE PCB. Figure 3. Pin Configuration , if the comparator is in compare mode the comparator is in compare mode. N Rev Page AD8465 , is greater than greater can be left floating EE ...
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... AD8465 TYPICAL PERFORMANCE CHARACTERISTICS 2 25°C, unless otherwise noted. CCI CCO A 800 600 400 V = 2.5V CC 200 0 –200 –400 –600 –800 – LE/HYS PIN (V) Figure 4. LE/HYS Pin Current vs. Voltage 200 150 100 –50 –100 –150 – ...
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... Figure 14. 50 MHz Output Voltage Waveform at V 1.543V 2.2 2.6 3.0 1.043V Figure 15. 50 MHz Output Voltage Waveform at V Rev Page AD8465 3.4 4.4 5.4 V (V) CCO Figure 13. LVDS Output Swing vs. V CCO Q Q 1.000ns/DIV = 2.5 V CCO Q Q 1.000ns/DIV = 5.5 V CCO ...
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... AD8465 APPLICATION INFORMATION POWER/GROUND LAYOUT AND BYPASSING The AD8465 comparator is a very high speed device. Despite the low noise output stage essential to use proper high speed design techniques to achieve the specified performance. Because the comparator is an uncompensated amplifier, feedback in any phase relationship is likely to cause oscillations or undesired hysteresis ...
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... Dispersion is defined as the variation in propagation delay as the input overdrive conditions are changed (see Figure 16 and Figure 17). The AD8465 dispersion is typically <1 the overdrive varies from 125 mV. This specification applies to both positive and negative signals because the AD8465 has substantially equal delays for positive-going and negative- going inputs and very low output skews ...
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... AD8465 The AD8465 comparator offers a programmable hysteresis feature that significantly improves accuracy and stability. Connecting an external pull-down resistor or a current source from the LE/HYS pin to GND varies the amount of hysteresis in a predictable and stable manner. Leaving the LE/HYS pin disconnected or driving it high removes hysteresis. The maxi- mum hysteresis that can be applied using this pin is approximately 160 mV ...
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... Rev Page 2.5V AD8465 1.25V 1.25V 10kΩ REF 10kΩ ADCMP601 LE/HYS 10kΩ 82pF 100kΩ Figure 24. Oscillator and Pulse-Width Modulator 2. AD8465 LE/HYS DIGITAL 74AHC INPUT 1G07 HYSTERESIS CURRENT 10kΩ Figure 25. Hysteresis Adjustment with Latch AD8465 LVDS PWM OUTPUT ...
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... AD8465 OUTLINE DIMENSIONS PIN 1 INDICATOR 12° MAX 1.00 0.85 0.80 SEATING PLANE ORDERING GUIDE Model Temperature Range 1 AD8465WBCPZ-WP −40°C to +125°C 1 AD8465WBCPZ-R7 −40°C to +125° RoHS Compliant Part. 3.15 0.60 MAX 3.00 SQ 2.85 0.60 MAX 10 2.95 9 TOP EXPOSED 2.75 SQ PAD VIEW (BOTTOM 2.55 0.50 VIEW) 7 0.40 6 0.30 0.80 MAX FOR PROPER CONNECTION OF ...
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... NOTES Rev Page AD8465 ...
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... AD8465 NOTES ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07958-0-4/09(0) Rev Page ...