Data Sheet
FEATURES
4 ns propagation delay at 5 V
Single-supply operation: 3 V to 5 V
100 MHz input
Latch function
Ultrafast, 4 ns
Single-Supply Comparators
AD8611/AD8612
PIN CONFIGURATIONS
V+
1
IN+
2
IN–
3
8
QA
QA
06010-001
AD8611
7
6
GND
TOP VIEW
V–
4
(Not to Scale)
5
LATCH
APPLICATIONS
High speed timing
Clock recovery and clock distribution
Line receivers
Digital communications
Phase detectors
High speed sampling
Read channel detection
PCMCIA cards
Zero-crossing detector
High speed analog-to-digital converter (ADC)
Upgrade for LT1394 and LT1016 designs
Figure 1. 8-Lead Narrow Body SOIC
(R-8)
V+
1
IN+
2
IN–
3
V–
4
8
QA
QA
06010-002
06010-003
AD8611
TOP VIEW
(Not to Scale)
7
6
5
GND
LATCH
Figure 2. 8-Lead MSOP
(RM-8)
QA
QA
GND
LEA
V–
INA–
INA+
1
2
3
4
5
6
7
14
13
QB
QB
AD8612
TOP VIEW
(Not to Scale)
12
11
10
9
8
GND
LEB
V+
INB–
INB+
Figure 3. 14-Lead TSSOP
(RU-14)
GENERAL DESCRIPTION
The AD8611/AD8612 are single and dual 4 ns comparators
with latch function and complementary output. The latch is not
functional if V
CC
is less than 4.3 V.
Fast 4 ns propagation delay makes the AD8611/AD8612 good
choices for timing circuits and line receivers. Propagation delays
for rising and falling signals are closely matched and tracked over
temperature. This matched delay makes the AD8611/AD8612
good choices for clock recovery because the duty cycle of the
output matches the duty cycle of the input.
The AD8611 has the same pinout as the LT1016 and LT1394,
with lower supply current and a wider common-mode input
range, which includes the negative supply rail.
The AD8611/AD8612 are specified over the industrial temper-
ature range (−40°C to +85°C). The AD8611 is available in both
8-lead MSOP and narrow 8-lead SOIC surface-mount packages.
The AD8612 is available in a 14-lead TSSOP surface-mount
package.
Rev. B
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AD8611/AD8612
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ............................................. 7
Applications Information .............................................................. 10
Data Sheet
Optimizing High Speed Performance ..................................... 10
Upgrading the LT1394 and LT1016 ......................................... 10
Maximum Input Frequency and Overdrive............................ 10
Output Loading Considerations............................................... 10
Using the Latch to Maintain a Constant Output.................... 11
Input Stage and Bias Currents .................................................. 11
Using Hysteresis ......................................................................... 11
Clock Timing Recovery ............................................................. 12
A 5 V, High Speed Window Comparator ................................ 12
Outline Dimensions ....................................................................... 16
Ordering Guide .......................................................................... 17
REVISION HISTORY
12/2016—Rev. A to Rev. B
Changes to Input Voltage Parameter, Table 3 ............................... 5
Added Input Current Parameter, Table 3 ...................................... 5
Deleted Endnote 1, Table 3 .............................................................. 5
Updated Outline Dimensions ....................................................... 17
Changes to Ordering Guide .......................................................... 18
8/2006—Rev. 0 to Rev. A
Updated Format .................................................................. Universal
Added No Latch if V
CC
< 4.3 V ......................................... Universal
Changes to Pin Names ....................................................... Universal
Added Pin Configurations and Function Descriptions Page ..... 6
Changes to Table 8 .......................................................................... 12
Changes to Figure 26 ...................................................................... 12
Changes to Ordering Guide .......................................................... 17
4/2000—Revision 0: Initial Version
Rev. B | Page 2 of 20
Data Sheet
SPECIFICATIONS
V+ = 5.0 V, V− = V
GND
= 0 V, T
A
= 25°C, unless otherwise noted.
Table 1.
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
LATCH ENABLE INPUT
Logic 1 Voltage Threshold
Logic 0 Voltage Threshold
Logic 1 Current
Logic 0 Current
Latch Enable
Pulse Width
Setup Time
Hold Time
DIGITAL OUTPUTS
Logic 1 Voltage
Logic 1 Voltage
Logic 0 Voltage
DYNAMIC PERFORMANCE
Input Frequency
Propagation Delay
Propagation Delay
Differential Propagation Delay
(Rising Propagation Delay vs.
Falling Propagation Delay)
Rise Time
Fall Time
POWER SUPPLY
Power Supply Rejection Ratio
V+ Supply Current
2
Ground Supply Current
V− Supply Current
2
1
2
AD8611/AD8612
Symbol
V
OS
Test Conditions/Comments
Min
Typ
1
Max
7
8
Unit
mV
mV
μV/°C
μA
μA
μA
V
dB
V/V
pF
V
V
μA
μA
ns
ns
ns
V
V
V
MHz
ns
ns
ns
ns
ns
ns
dB
mA
mA
mA
mA
mA
−40°C ≤ T
A
≤ +85°C
ΔV
OS
/ΔT
I
B
I
B
I
OS
V
CM
CMRR
A
VO
C
IN
V
IH
V
IL
I
IH
I
IL
t
PW(E)
t
S
t
H
V
OH
V
OH
V
OL
f
MAX
t
P
t
P
Δt
P
V
CM
= 0 V
−40°C ≤ T
A
≤ +85°C
V
CM
= 0 V
0 V ≤ V
CM
≤ 3.0 V
R
L
= 10 kΩ
–6
–7
0.0
55
4
–4
–4.5
±4
3.0
85
3000
3.0
1.65
1.60
–0.3
–2.7
3
0.5
0.5
V
CC
> 4.3 V
V
CC
> 4.3 V
V
CC
> 4.3 V, V
LH
= 3.0 V
V
CC
> 4.3 V, V
LL
= 0.3 V
V
CC
> 4.3 V
V
CC
> 4.3 V
V
CC
> 4.3 V
I
OH
= 50 μA, ΔV
IN
> 250 mV
I
OH
= 3.2 mA, ΔV
IN
> 250 mV
I
OL
= 3.2 mA, ΔV
IN
> 250 mV
400 mV p-p sine wave
200 mV step with 100 mV overdrive
1
−40°C ≤ T
A
≤ +85°C
100 mV step with 5 mV overdrive
100 mV step with 100 mV overdrive
1
20% to 80%
80% to 20%
2.0
–1.0
–5
0.8
3.0
2.4
3.35
3.4
0.25
100
4.0
5
5
0.5
2.5
1.1
0.4
5.5
2.0
PSRR
I+
I
GND
I−
4.5 V ≤ V+ ≤ 5.5 V
−40°C ≤ T
A
≤ +85°C
V
O
= 0 V, R
L
= ∞
−40°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +85°C
55
73
5.7
3.5
2.2
2
10
10
7
7
4
5
Guaranteed by design.
Per comparator.
Rev. B | Page 3 of 20
AD8611/AD8612
V+ = 3.0 V, V− = VGND = 0 V, T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
OUTPUT CHARACTERISTICS
Output High Voltage
Output Low Voltage
LATCH ENABLE INPUT
POWER SUPPLY
Power Supply Rejection Ratio
Supply Currents
V+ Supply Current
2
Ground Supply Current
2
V– Supply Current
2
DYNAMIC PERFORMANCE
Propagation Delay
1
2
Data Sheet
Symbol
V
OS
I
B
I
B
V
CM
CMRR
V
OH
V
OL
Test Conditions/Comments
Min
Typ
1
−4.0
−4.5
Max
7
Unit
mV
μA
μA
V
dB
V
V
V
CM
= 0 V
−40°C ≤ T
A
≤ +85°C
0 V ≤ V
CM
≤ 1.0 V
I
OH
= −3.2 mA, V
IN
> 250 mV
I
OL
= +3.2 mA, V
IN
> 250 mV
Not functional if V
CC
< 4.3 V
2.7 V ≤ V+ ≤ 6 V
V
O
= 0 V, R
L
= ∞
−40°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +85°C
−6
−7
0
55
1.2
1
1.0
0.3
PSRR
I+
I
GND
I−
46
4.5
2.5
2
6.5
10
3.5
5.5
3.5
4.8
6.5
dB
mA
mA
mA
mA
mA
mA
ns
−40°C ≤ T
A
≤ +85°C
t
P
100 mV step with 20 mV overdrive
3
4.5
Output high voltage without pull-up resistor. It can be useful to have a pull-up resistor to V+ for 3 V operation.
Per comparator.
3
Guaranteed by design.
Rev. B | Page 4 of 20
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Total Analog Supply Voltage
Digital Supply Voltage
Input Voltage
Differential Input Voltage
Output Short-Circuit Duration to GND
Input Current
Storage Temperature Range
R, RU, RM Packages
Operating Temperature Range
Junction Temperature Range
R, RU, RM Packages
Lead Temperature Range (Soldering, 10 sec)
Rating
7.0 V
7.0 V
VCC +0.3 V to
VEE −0.3 V
±5 V
Indefinite
±5 mA
−65°C to +150°C
−40°C to +85°C
−65°C to +150°C
300°C
AD8611/AD8612
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
THERMAL RESISTANCE
Table 4.
Package Type
8-Lead SOIC (R)
8-Lead MSOP (RM)
14-Lead TSSOP (RU)
1
θ
JA1
158
240
240
θ
JC
43
43
43
Unit
°C/W
°C/W
°C/W
θ
JA
is specified for the worst-case conditions, that is, a device in socket for
P-DIP and a device soldered in circuit board for SOIC and TSSOP.
ESD CAUTION
Rev. B | Page 5 of 20