Dual Single Supply Comparator AD8598 CONFIGURATIONS N-16, RU-16 R

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Dual Single Supply Comparator AD8598 CONFIGURATIONS N-16, RU-16 R

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FEATURES Propagation Delay Single Supply Operation: Power Symmetrical Layout Latch Function TSSOP Packages
Dual Single Supply Comparator AD8598
CONFIGURATIONS N-16, RU-16 R-16A
AD8598
VIEW (Not Scale)
APPLICATIONS Clock Recovery Clock Distribution High Speed Data Line Receivers Phase Detectors Digital Communications Detection High Speed Sampling Upgrade MAX912 Satellite Receivers PCMCIA Cards Wireless Data Links Battery Operated Instrumentation GENERAL DESCRIPTION
AD8598 dual comparator with digital latches. Separate supplies enable input stage operated from high
CONNECT
Ultrafast propagation delay makes AD8598 good choice timing circuits line receivers. Propagation delays rising falling signals closely matched track over temperature. This matched delay makes AD8598 good choice clock recovery, since duty cycle output will match duty cycle input. AD8598 same pinout version AD9698. single comparator like AD8598, please refer AD8561 data sheet. AD8598 specified over industrial (-40°C +85°C) temperature range. AD8598 available both 16-lead plastic DIP, 16-lead TSSOP narrow R-16A surface mount packages.
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 1998
AD8598-SPECIFICATIONS
ELECTRICAL SPECIFICATIONS +5.0
Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Input Offset Current Input Common-Mode Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Input Capacitance Symbol VOS/T CMRR
unless otherwise noted)
-3.5 Units µV/°C
Conditions
-40°C +85°C -40°C +85°C +3.0
+3.0
LATCH ENABLE INPUT Logic Voltage Threshold Logic Voltage Threshold Logic Current Logic Current Latch Enable Pulsewidth Setup Time Hold Time DIGITAL OUTPUTS Logic Voltage Logic Voltage Logic Voltage tPW(E) DYNAMIC PERFORMANCE Propagation Delay Propagation Delay Differential Propagation Delay (Rising Propagation Delay Falling Propagation Delay) Rise Time Fall Time POWER SUPPLY Power Supply Rejection Ratio Positive Supply Current Pin) Ground Supply Current (GND Pins) Analog Supply Current Pin)
NOTES Guaranteed design. Specifications subject change without notice.
+3,000 +1.65 +1.60 -0.3
+2.0
+0.8
-3.2 Step with Overdrive -40°C +85°C Step with Overdrive Step with Overdrive1 +4.5 +5.5 -40°C +85°C -40°C +85°C -40°C +85°C
+3.0 +0.3
-1.0
+3.5 +2.4
+3.5 +0.25 +0.4 6.75 12.0 15.0 11.0
PSRR IGND
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AD8598 ELECTRICAL SPECIFICATIONS +5.0
Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Input Offset Current Input Common-Mode Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Input Capacitance Symbol VOS/T CMRR
unless otherwise noted)
-2.5 Units µV/°C
Conditions
-40°C +85°C -40°C +85°C -5.0 +3.0 -5.0
+3.0
LATCH ENABLE INPUT Logic Voltage Threshold Logic Voltage Threshold Logic Current Logic Current Latch Enable Pulsewidth Setup Time Hold Time DIGITAL OUTPUTS Logic Voltage Logic Voltage DYNAMIC PERFORMANCE Propagation Delay Propagation Delay Differential Propagation Delay (Rising Propagation Delay Falling Propagation Delay) Rise Time Fall Time Dispersion POWER SUPPLY Power Supply Rejection Ratio Supply Current Positive Supply Current Pin) Ground Supply Current (GND Pins) Analog Supply Current Pin)
NOTES Guaranteed design. Specifications subject change without notice.
+3,000 +1.65 +1.60 -0.5
+2.0 +3.0 +0.3
+0.8
tPW(E)
-3.2 Step with Overdrive -40°C +85°C Step with Overdrive Step with Overdrive1 -40°C +85°C -40°C +85°C -40°C +85°C
+2.6 +3.5 +0.2 +0.3 13.0 15.0 11.0
PSRR IGND
REV.
AD8598-SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Common-Mode Voltage Range Common-Mode Rejection Ratio OUTPUT CHARACTERISTICS Output High Voltage1 Output Voltage POWER SUPPLY Power Supply Rejection Ratio Supply Currents Positive Supply Current Pin)
+3.0 VGND unless otherwise noted)
Conditions -40°C +85°C +0.1 +1.5 -3.2 +3.2 +2.7 VCC, -40°C +85°C +1.2 +0.3 11.0 -3.0 +1.5 Units
Symbol CMRR PSRR
Ground Supply Current (GND Pins) Analog Supply Current Pin) IGND DYNAMIC PERFORMANCE Propagation Delay
Specifications subject change without notice.
NOTES Output high voltage without pull-up resistor. useful have pull-up resistor operation. Guaranteed design.
-40°C +85°C -40°C +85°C Step with Overdrive2 Package Type 16-Lead Plastic 16-Lead SOIC 16-Lead TSSOP
ORDERING GUIDE
ABSOLUTE MAXIMUM RATINGS
Total Analog Supply Voltage Digital Supply Voltage Analog Positive Supply-Digital Positive Supply -600 Input Voltage1 Differential Input Voltage Output Short-Circuit Duration Indefinite Storage Temperature Range Package -65°C +150°C Operating Temperature Range -40°C +85°C Junction Temperature Range Package -65°C +150°C Lead Temperature Range (Soldering, sec) +300°C
Units °C/W °C/W °C/W
NOTES analog input voltage equal analog supply voltage, whichever less. specified worst case conditions, i.e., specified device socket P-DIP specified device soldered circuit board SOIC TSSOP packages.
Model AD8598AN AD8598ARU AD8598AR
Temperature Range -40°C +85°C -40°C +85°C -40°C +85°C
Package Descriptions 16-Lead Plastic 16-Lead Thin Shrink Small Outline (TSSOP) 16-Lead Narrow Body
Package Options N-16 RU-16 R-16A
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although AD8598 features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
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AD8598 Typical Performance Characteristics unless otherwise noted)
+125 OUTPUT VOLTAGE Volts +5V, SINGLE SUPPLY NUMBER COMPARATORS PROPAGATION DELAY +5V, SINGLE SUPPLY STEP SIZE 100mV CAPACITANCE LOAD 10pF
PROPAGATION DELAY
PROPAGATION DELAY
PROPAGATION DELAY
DIFFERENTIAL INPUT VOLTAGE
INPUT VOLTAGE
OVERDRIVE
Figure Output Voltage Differential Input Voltage
Figure Typical Distribution Input Offset Voltage
Figure Propagation Delay Overdrive
+5V, SINGLE SUPPLY STEP SIZE 100mV OVERDRIVE LOAD
FALLING EDGE
FALLING EDGE
+5V, SINGLE SUPPLY OVERDRIVE 10mV CAPACITANCE LOAD 10pF STEP SIZE 800mV 200mV 400mV 100mV SOURCE RESISTANCE
SINGLE SUPPLY STEP SIZE 100mV OVERDRIVE CAPACITANCE LOAD 10pF
LOAD CAPACITANCE
4.75 5.25 SUPPLY VOLTAGE Volts HOLD TIME SETUP TIME TEMPERATURE
Figure Propagation Delay Load Capacitance
Figure Propagation Delay Source Resistance
Figure Propagation Delay Positive Supply Voltage
+5V, SINGLE SUPPLY STEP SIZE 100mV OVERDRIVE 5mV, LOAD CAPACITANCE 10pF
PROPAGATION DELAY TIME +125
PROPAGATION DELAY
STEP SIZE 100mV OVERDRIVE LOAD CAPACITANCE 10pF COMMON-MODE VOLTAGE Volts
TEMPERATURE
Figure Propagation Delay Temperature
Figure Propagation Delay
Figure Latch Setup-and-Hold Time Temperature
REV.
AD8598
OUTPUT VOLTAGE Volts
ANALOG SUPPLY CURRENT
OUTPUT HIGH VOLTAGE Volts
+125
+5V, +5V, 12.0
+125
16.0
SINK CURRENT
SOURCE CURRENT
20.0
TEMPERATURE
ANALOG SUPPLY CURRENT
POSITIVE SUPPLY CURRENT
INPUT BIAS CURRENT
Figure Output Voltage, Sink Current
12.0 +125 16.0 20.0 SUPPLY VOLTAGE Volts
Figure Output High Voltage, Source Current
Figure Analog Supply Current Temperature Supplies
+125 FREQUENCY
INPUT COMMON-MODE VOLTAGE Volts
Figure Analog Supply Current Supply Voltage
Figure Positive Supply Current Input Frequency
Figure Input Bias Current Input Common-Mode Voltage Supplies
INPUT BIAS CURRENT
TEMPERATURE
Figure Input Bias Current Temperature
REV.
AD8598
APPLICATIONS Optimizing High Speed Performance
Note that signals much greater than +3.0 will result increased input currents cause device operate more slowly. input bias current AD8598 same magnitude typical) MAX912 typical), current flows AD8598 into MAX912. relatively value resistors and/or impedance sources used inputs, voltage shift bias current should small. AD8598 (6.75 typical) faster than MAX912 typical). While this beneficial many systems, timing need adjusted take advantage higher speed. AD8598 slightly more output voltage swing when output lightly loaded. AD8598 uses less current (typically than MAX912 (typically mA).
Increasing Output Swing
with high speed comparator amplifier, proper design layout techniques should used ensure optimal performance from AD8598. performance limits high speed circuitry easily result stray capacitance, improper ground impedance other layout issues. Minimizing resistance from source input important consideration maximizing high speed operation AD8598. Source resistance combination with equivalent input capacitance could cause lagged response input, thus delaying output. input capacitance AD8598, combination with stray capacitance from input ground could result several picofarads equivalent capacitance. combination source resistance input capacitance yields time constant which slower than capability AD8598. Source impedances should less than best performance. also important provide bypass capacitors power supply high speed application. electrolytic bypass capacitor should placed within inches each power supply ground. These capacitors will reduce potential voltage ripples from power supply. addition, ceramic capacitor should placed close possible from power supply pins ground. These capacitors charge reservoir device during high frequency switching.
Replacing MAX912
ground plane recommended proper high speed performance. This created using continuous conductive plane over surface circuit board, only allowing breaks plane necessary current paths. ground plane provides inductance ground, eliminating potential differences different ground points throughout circuit board caused from "ground bounce." proper ground plane also minimizes effects stray capacitance circuit board. AD8598 compatible with MAX912 comparator. While easy replace MAX912 with higher performance AD8598, please note that there differences, useful check these ensure proper operation. There five major differences between AD8598 MAX912; input voltage range, input bias currents, speed, output swing power consumption. When operated single supply, MAX912 input voltage range from -0.2 +3.5 AD8598 input range from +3.0 Signals above +3.0 result slower response times (see Figure both signals exceed +3.0 signals shifted attenuated bring them into range, keeping mind note about source resistance Optimizing High Speed Performance. only signals exceeds +3.0 only slightly, other signal always well within range, comparator operate without changes circuit. Example: comparator compares fast moving signal fixed +2.5 reference. Since comparator only needs operate when signal near +2.5 both signals will within input range (near +2.5 well under +3.0 when comparator needs change output.
Although required normal operation, output voltage swing AD8598 increased connecting resistor from output device power supply. This configuration useful voltage power supply applications where maximizing output voltage swing important. Adding pull-up resistor device's output will adversely affect specifications AD8598.
Output Loading Considerations
AD8598 output deliver output current without significant increase propagation delay. output device should connected more than twenty (20) input logic gates, drive load resistance less than ensure best performance from AD8598 important minimize capacitive loading output device. Capacitive loads greater than will cause ringing output waveform will reduce operating bandwidth comparator.
Setup Hold Times Latching Output
latch inputs used retain data outputs AD8598. When voltage latch input goes high, output device will remain constant regardless input voltages. setup time latch ns-3 hold time This means that ensure data retention output, input signal must valid least before latch goes high must remain valid least after latch goes high. Once latch input voltage goes low, output data will appear approximately logic high latch input minimum +2.0 logic maximum +0.8 This makes latch input easily interface with CMOS logic gates. latch circuitry AD8598 built-in hysteresis.
Input Stage Bias Currents
AD8598 uses differential input stage that enables input common-mode range extend from negative supply rail within +2.2 positive supply rail. input common-mode voltage found average voltage inputs device. ensure fastest response time, care should taken allow input common-mode voltage exceed either these voltages.
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AD8598
input bias current AD8598 with differential input stage, this bias current will zero input that high will double input that low. Care should taken choosing resistor values connected inputs large resistors could cause significant voltage drops input bias current. input capacitance AD8598 typically This measured inserting source resistance input measuring change propagation delay.
Using Hysteresis
input signal directly connected noninverting input comparator. output back inverting input through ratio establishes width hysteresis window with VREF setting center window, average switching voltage. output will switch high when input voltage greater than will switch again until input voltage less than given Equation -1-V
SIGNAL COMPARATOR VREF
Hysteresis easily added comparator through addition positive feedback. Adding hysteresis comparator offers advantage noisy environments where desirable output toggle between states when input signal near switching threshold. Figure shows method configuring AD8598 with hysteresis.
where positive supply voltage.
Figure Configuring AD8598 with Hysteresis
frequencies greater than
capacitor, also added introduce pole into feedback network. This effect increasing amount hysteresis high frequencies. This useful when comparing relatively slow signal high frequency noise environment.
hysteresis window approaches frequencies less than threshold voltages remain Equation
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AD8598
SPICE Model
AD8598 SPICE Macro-Model Typical Values 4/98, Ver. ADSC Node assignments non-inverting input inverting input positive supply negative .SUBCKT AD8598 INPUT STAGE IBIAS 800E-6 1E-12 3E-12 VCM1 POLY(1) (31,98) 1E-3 Reference Voltage EREF POLY(2) (99,0) (50,0) RREF 100E3 CMRR=80dB, ZERO 1kHz ECM1 POLY(2) (1,98) (2,98) RCM1 10E3 RCM2 CCM1 15.9E-9 Latch Section 100E3 (4,6) (80,51) SLATCH1 10E-12 (12,98) Power Supply Section
supply Latch
DGND
QNOT
REV.
AD8598
GSY1 POLY(1) (99,50) 4E-3 -2.6E-4 GSY2 POLY(1) (99,50) 3.7E-3 -.6E-3 Gain Stage Av=250 fp=100MHz (12,98) 0.25 1000 10E-13 Output 10E-12 5E-12 POLY(1) (20,98) POLY(1) (20,98) Output 10E-12 5E-12 POLY(1) (20,98) POLY(1) (20,98) MODELS .MODEL PNP(BF=100,IS=1E-16) .MODEL NPN(BF=100,VAF=130,IS=1E-14) .MODEL D(IS=1E-16) .MODEL SLATCH1 .ENDS AD8598
-10-
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AD8598
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
16-Lead Plastic (N-16)
0.840 (21.33) 0.745 (18.93)
0.280 (7.11) 0.240 (6.10) 0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93)
0.060 (1.52) 0.015 (0.38) 0.130 (3.30) 0.100 (2.54) 0.070 (1.77) SEATING 0.045 (1.15) PLANE
0.210 (5.33) 0.160 (4.06) 0.115 (2.93) SEATING PLANE
0.022 (0.558) 0.014 (0.356)
0.015 (0.381) 0.008 (0.204)
0.177 (4.50) 0.169 (4.30)
16-Lead Thin Shrink Small Outline (RU-16)
0.201 (5.10) 0.193 (4.90)
0.256 (6.50) 0.246 (6.25)
0.006 (0.15) 0.002 (0.05)
0.0433 (1.10) 0.0118 (0.30) 0.0075 (0.19) 0.0079 (0.20) 0.0035 (0.090)
PRINTED U.S.A.
0.0256 (0.65)
0.028 (0.70) 0.020 (0.50)
16-Lead Narrow Body (R-16A)
0.3937 (10.00) 0.3859 (9.80)
0.1574 (4.00) 0.1497 (3.80)
0.2440 (6.20) 0.2284 (5.80)
0.0098 (0.25) 0.0040 (0.10)
0.0688 (1.75) 0.0532 (1.35)
0.0196 (0.50) 0.0099 (0.25)
SEATING PLANE
0.0500 (1.27)
0.0192 (0.49) 0.0099 (0.25) 0.0138 (0.35) 0.0075 (0.19)
0.0500 (1.27) 0.0160 (0.41)
REV.
-11-
C3452a-8-10/98

Dual Single Supply Comparator AD8598 CONFIGURATIONS N-16, RU-16 R

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