Ultrafast, 4 ns
Single-Supply Comparators
AD8611/AD8612
PIN CONFIGURATIONS
FEATURES
4 ns propagation delay at 5 V
Single-supply operation: 3 V to 5 V
100 MHz input
V+
IN+
IN–
V–
1
2
3
4
8
7
6
5
QA
AD8611
QA
GND
LATCH
TOP VIEW
(Not to Scale)
Latch function
Figure 1. 8-Lead Narrow Body SOIC
(R-8)
APPLICATIONS
High speed timing
Clock recovery and clock distribution
Line receivers
Digital communications
Phase detectors
High speed sampling
QA
V+
IN+
IN–
V–
1
2
3
4
8
7
6
5
AD8611
QA
TOP VIEW
GND
LATCH
(Not to Scale)
Figure 2. 8-Lead MSOP
(RM-8)
Read channel detection
PCMCIA cards
Zero-crossing detector
High speed analog-to-digital converter (ADC)
Upgrade for LT1394 and LT1016 designs
1
2
3
4
5
6
14
13
12
11
10
9
QA
QA
QB
QB
GND
LEA
V–
AD8612
TOP VIEW
(Not to Scale)
GND
LEB
V+
INA–
INA+
INB–
INB+
8
7
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 VCC is less than 4.3 V.
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.
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/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 ofthird parties that may result fromits 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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.