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AD8561AN-AD8561AR-AD8561ARU
Ultrafast 7 ns Single Supply Comparator
REV.0
Ultrafast 7 ns
Single Supply Comparator
PIN CONFIGURATIONSFEATURES
7 ns Propagation Delay at 5 V
Single Supply Operation: 3 V to 10 V
Low Power
Latch Function
TSSOP Packages
APPLICATIONS
High Speed Timing
Clock Recovery and Clock Distribution
Line Receivers
Digital Communications
Phase Detectors
High Speed Sampling
Read Channel Detection
PCMCIA Cards
Upgrade for LT1016 Designs
GENERAL DESCRIPTIONThe AD8561 is a single 7 ns comparator with separate input and
output sections. Separate supplies enable the input stage to be
operated from –5 V dual supplies and +5 V single supplies.
Fast 7 ns propagation delay makes the AD8561 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 AD8561 a good
choice for clock recovery, since the duty cycle of the output will
match the duty cycle of the input.
The AD8561 has the same pinout as the LT1016, with lower
supply current and a wider common-mode input range, which
includes the negative supply rail.
The AD8561 is specified over the industrial (–40°C to +85°C)
temperature range. The AD8561 is available in both the 8-lead
plastic DIP, 8-lead TSSOP or narrow SO-8 surface mount
packages.
8-Lead Narrow Body SO
(SO-8)
8-Lead Plastic DIP
(N-8)
8-Lead TSSOP
(RU-8)1IN
2IN
OUT
OUT
GND
LATCHV21IN
2IN
OUT
OUT
GND
LATCH
AD8561
AD8561–SPECIFICATIONS
ELECTRICAL SPECIFICATIONSNOTESGuaranteed by design.
Specifications subject to change without notice.
(@ V+ = +5.0 V, V– = VGND = 0 V, TA = +258C unless otherwise noted)
AD8561
ELECTRICAL SPECIFICATIONSDYNAMIC PERFORMANCE␣
NOTESGuaranteed by design.
Specifications subject to change without notice.
(@ V+ = +5.0 V, V– = VGND = 0 V, V– = –5 V, TA = +258C unless otherwise noted)
AD8561–SPECIFICATIONS
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
ELECTRICAL SPECIFICATIONSNOTESOutput 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)
ABSOLUTE MAXIMUM RATINGSTotal Analog Supply Voltage . . . . . . . . . . . . . . . . . . . . .+14 V
Digital Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . .+14 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.
ORDERING GUIDE
Typical Performance Characteristics(V+ = +5 V, V– = 0 V, TA = +258C unless otherwise noted)
DIFFERENTIAL INPUT VOLTAGE – mV
OUTPUT VOLTAGE – Volts
–2.5–2.01.5–1.5–1.0–0.500.51.0Figure 1.Output Voltage vs. Differen-
tial Input Voltage
LOAD CAPACITANCE – pF
PROPAGATION DELAY – ns01050203040Figure 4.Propagation Delay vs. Load
Capacitance
TEMPERATURE – 8C
PROPAGATION DELAY – ns–50–2550025100125Figure 7.Propagation Delay vs.
Temperature
INPUT VOLTAGE – mV
NUMBER OF COMPARATORS
100Figure 2.Typical Distribution of Input
Offset Voltage
SOURCE RESISTANCE – kV
PROPAGATION DELAY – ns00.5211.5Figure 5.Propagation Delay vs.
Source Resistance
COMMON-MODE VOLTAGE – Volts
PROPAGATION DELAY – ns015234Figure 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
AD8561
SINK CURRENT – mA
OUTPUT LOW VOLTAGE – Volts
0.1Figure 10.Output Low Voltage, VOL
vs. Sink Current
SUPPLY VOLTAGE –Volts
I–, ANALOG SUPPLY CURRENT – mA
–4.0Figure 13.Analog Supply Current vs.
Supply Voltage for +5 V, –5 V Supplies
TEMPERATURE – 8C
INPUT BIAS CURRENT –
–4.0Figure 16.Input Bias Current vs.
Temperature
SOURCE CURRENT – mA
OUTPUT HIGH VOLTAGE – Volts
TA = +1258C
TA = –408CFigure 11.Output High Voltage, VOH
vs. Source Current
FREQUENCY – MHz
POSITIVE SUPPLY CURRENT – mA10100Figure 14.Positive Supply Current
vs. Frequency
Figure 12.Analog Supply Current vs.
Temperature for +5 V, –5 V Supplies
Figure 15.Input Bias Current vs. Input
Common-Mode Voltage for +5 V, –5 V
Supplies
