Ultrafast, 4 ns
Single-Supply Comparators
AD8611/AD8612
FEATURES
4 ns propagation delay at 5 V
Single-supply operation: 3 V to 5 V
100 MHz input
Latch function
PIN CONFIGURATIONS
V+
1
IN+
2
IN–
3
8
QA
QA
06010-001
06010-003
AD8611
7
6
GND
TOP VIEW
(Not to Scale)
5
LATCH
V–
4
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
LATCH
06010-002
AD8611
TOP VIEW
(Not to Scale)
7
6
5
GND
Figure 2. 8-Lead MSOP
(RM-8)
QA
QA
GND
LEA
V–
INA–
INA+
1
2
3
4
5
6
7
14
QB
13
QB
AD8612
TOP VIEW
(Not to Scale)
12
GND
11
LEB
10
V+
9
8
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. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
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..................................................................................... 10
Optimizing High Speed Performance ..................................... 10
Upgrading the LT1394 and LT1016......................................... 10
Maximum Input Frequency and Overdrive............................ 10
Output Loading Considerations............................................... 11
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
8/06—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
4/00—Revision 0: Initial Version
Rev. A | Page 2 of 20
AD8611/AD8612
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
2
V− Supply Current
2
Symbol
V
OS
−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
3.0
2.4
3.35
3.4
0.25
100
4.0
5
5
0.5
2.5
1.1
55
73
5.7
3.5
2.2
−40°C ≤ T
A
≤ +85°C
1
2
Conditions
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
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
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
10
10
7
7
4
5
Guaranteed by design.
Per comparator.
Rev. A | 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
Symbol
V
OS
I
B
I
B
V
CM
CMRR
V
OH
V
OL
Conditions
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 may be useful to have a pull-up resistor to V+ for 3 V operation.
Per comparator.
3
Guaranteed by design.
Rev. A | Page 4 of 20
AD8611/AD8612
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Total Analog Supply Voltage
Digital Supply Voltage
Input Voltage
1
Differential Input Voltage
Output Short-Circuit Duration to GND
Storage Temperature Range
R, RU, RM Packages
Operating Temperature Range
Junction Temperature Range
R, RU, RM Packages
Lead Temperature Range (Soldering, 10 sec)
1
Rating
7.0 V
7.0 V
±4 V
±5 V
Indefinite
−65°C to +150°C
−40°C to +85°C
−65°C to +150°C
300°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
Table 4.
Package Type
8-Lead SOIC (R)
8-Lead MSOP (RM)
14-Lead TSSOP (RU)
1
The analog input voltage is equal to ±4 V or the analog supply voltage,
whichever is less.
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
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. A | Page 5 of 20
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