Ultrafast, 4 ns

Single-Supply Comparators

AD8611/AD8612

Rev. A

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FEATURES

4 ns propagation delay at 5 V

Single-supply operation: 3 V to 5 V

100 MHz input

Latch function

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

PIN CONFIGURATIONS

V+

IN+

V–

IN–

QA

QA

GND

LATCH

1

2

3

4

8

7

6

5

AD8611

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead Narrow Body SOIC

(R-8)

QA

8

QA

7

GND

6

LATCH

5

AD8611

TOP VIEW

(Not to Scale)

Figure 2. 8-Lead MSOP

(RM-8)

GND

LEA

V–

INA–

INA+

GND

LEB

V+

INB–

INB+

QA

QA

QB

QB

1

2

3

4

5

6

7

AD8612

14

13

12

11

10

9

8

TOP VIEW

(Not to Scale)

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

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.