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AD8598N/a9avaiDual 7 ns Single Supply Comparator
AD8598ARADN/a11avaiDual 7 ns Single Supply Comparator
AD8598ARADIN/a50avaiDual 7 ns Single Supply Comparator
AD8598ARUADN/a597avaiDual 7 ns Single Supply Comparator


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AD8598-AD8598AR-AD8598ARU
Dual 7 ns Single Supply Comparator
REV.A
Dual 7 ns
Single Supply Comparator
PIN CONFIGURATIONSFEATURES
7 ns Propagation Delay
Single Supply Operation: +3 V to +10 V
Low Power
Symmetrical Layout
Latch Function
TSSOP Packages
APPLICATIONS
Clock Recovery and Clock Distribution
High Speed Data
Line Receivers
Phase Detectors
Digital Communications
I and Q Detection
High Speed Sampling
Upgrade for MAX912
Satellite Receivers
PCMCIA Cards
Wireless Data Links
Battery Operated Instrumentation
GENERAL DESCRIPTION

The AD8598 is a dual 7 ns comparator with digital latches.
Separate supplies enable the input stage to be operated from
+5 V to as high as –5 V.
Ultrafast 7 ns propagation delay makes the AD8598 a good
choice for timing circuits and line receivers. Propagation delays
for rising and falling signals are closely matched and track over
temperature. This matched delay makes the AD8598 a good
choice for clock recovery, since the duty cycle of the output will
match the duty cycle of the input.
The AD8598 has the same pinout as the DIP version of the
AD9698. For a single comparator like the AD8598, please refer
to the AD8561 data sheet.
The AD8598 is specified over the industrial (–40°C to +85°C)
temperature range. The AD8598 is available in both the 16-lead
plastic DIP, 16-lead TSSOP or narrow R-16A surface mount
packages.
N-16, RU-16 and R-16A
NC = NO CONNECT
GND
LEA
IN A–
IN A+
GND
LEB
IN B–
IN B+
AD8598–SPECIFICATIONS
ELECTRICAL SPECIFICATIONS

NOTESGuaranteed by design.
Specifications subject to change without notice.
(@ V+ = +5.0 V, V– = VGND = 0 V, TA = +258C unless otherwise noted)
AD8598
ELECTRICAL SPECIFICATIONS

DYNAMIC PERFORMANCE␣
NOTESGuaranteed by design.
Specifications subject to change without notice.
(@ V+ = +5.0 V, VGND = 0 V, V– = –5 V, TA = +258C unless otherwise noted)
AD8598–SPECIFICATIONS
CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
ELECTRICAL SPECIFICATIONS

NOTESOutput high voltage without pull-up resistor. It may be useful to have a pull-up resistor to V+ for +3 V operation.Guaranteed by design.
Specifications subject to change without notice.
(@ V+ = +3.0 V, V– = VGND = 0 V, TA = +258C unless otherwise noted)
ORDERING GUIDE
ABSOLUTE MAXIMUM RATINGS

Total Analog Supply Voltage . . . . . . . . . . . . . . . . . . . . .+14 V
Digital Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . .+7 V
Analog Positive Supply–Digital Positive Supply . . . . .–600 mV
Input Voltage1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–7 V
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . .–8 V
Output Short-Circuit Duration to GND . . . . . . . . .Indefinite
Storage Temperature Range
N, R, RU Package . . . . . . . . . . . . . . . . . .–65°C to +150°C
Operating Temperature Range . . . . . . . . . . .–40°C to +85°C
Junction Temperature Range
N, R, RU Package . . . . . . . . . . . . . . . . . .–65°C to +150°C
Lead Temperature Range (Soldering, 10 sec) . . . . . . .+300°C
NOTESThe analog input voltage is equal to –7 V or the analog supply voltage, whichever
is less.qJA is specified for the worst case conditions, i.e., qJA is specified for device in socket
for P-DIP and qJA is specified for device soldered in circuit board for SOIC and
TSSOP packages.
Typical Performance Characteristics(V+ = +5 V, V– = 0 V, TA = +258C unless otherwise noted)
DIFFERENTIAL INPUT VOLTAGE – mV
OUTPUT VOLTAGE – Volts
22.522.01.521.521.020.500.51.0
Figure 1.Output Voltage vs. Differen-
tial Input Voltage
LOAD CAPACITANCE – pF
PROPAGATION DELAY – ns01050203040

Figure 4.Propagation Delay vs. Load
Capacitance
TEMPERATURE – 8C
PROPAGATION DELAY – ns–50–2550025100125

Figure 7.Propagation Delay vs.
Temperature
INPUT VOLTAGE – mV
NUMBER OF COMPARATORS
400
501234
100
232221
Figure 2.Typical Distribution of Input
Offset Voltage
SOURCE RESISTANCE – kV
PROPAGATION DELAY – ns00.5211.5

Figure 5.Propagation Delay vs.
Source Resistance
COMMON-MODE VOLTAGE – Volts
PROPAGATION DELAY – ns015234

Figure 8.Propagation Delay vs. VCM
Figure 3.Propagation Delay vs.
Overdrive
Figure 6.Propagation Delay vs. Posi-
tive Supply Voltage

Figure 9.Latch Setup-and-Hold Time
vs. Temperature
AD8598
SINK CURRENT – mA
OUTPUT LOW VOLTAGE – Volts
0.1

Figure 10.Output Low Voltage, VOL
vs. Sink Current
SUPPLY VOLTAGE – Volts
I–, ANALOG SUPPLY CURRENT – mA

220.021246810
Figure 13.Analog Supply Current vs.
Supply Voltage
TEMPERATURE – 8C
INPUT BIAS CURRENT –

25.02752501502250257510012550
Figure 16.Input Bias Current vs.
Temperature
SOURCE CURRENT – mA
OUTPUT HIGH VOLTAGE – Volts
TA = +1258C
TA = 2408C

Figure 11.Output High Voltage, VOH
vs. Source Current

FREQUENCY – MHz
POSITIVE SUPPLY CURRENT – mA
11010020

Figure 14.Positive Supply Current
vs. Input Frequency
Figure 12.Analog Supply Current vs.
Temperature for –5 V Supplies
Figure 15.Input Bias Current vs. Input
Common-Mode Voltage for –5 V
Supplies
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