Single Supply High Speed PECL Comparators

Preliminary Technical Data

ADCMP551/ADCMP552/ADCMP553

Rev. PrB

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FEATURES

Single power supply

750 ps propagation delay input to output

100 ps propagation delay dispersion

Differential PECL compatible outputs

Differential latch control

Internal latch pull-up resistors

Power supply rejection greater than 70 dB

750 ps minimum pulse width

Equivalent input rise time bandwidth > 750 MHz

Typical output rise/fall of 500 ps

Programmable Hysteresis

APPLICATIONS

Automatic test equipment

High speed instrumentation

Scope and logic analyzer front ends

Window comparators

High speed line receivers

Threshold detection

Peak detection

High speed triggers

Patient diagnostics

Disk drive read channel detection

Hand-held test instruments

Zero crossing detectors

Line receivers and signal restoration

Clock drivers

FUNCTIONAL BLOCK DIAGRAM

NONINVERTING

INPUT

INVERTING

INPUT

LATCH ENABLE

INPUT

Q OUTPUT

LATCH ENABLE

INPUT

Q OUTPUT

ADCMP551/

ADCMP552/

ADCMP553

Figure 1.

GENERAL DESCRIPTION

The ADCMP551/ADCMP552/ADCMP553 are single supply,

high speed comparators fabricated on Analog Devices’

proprietary XFCB process. The devices feature a 750 ps

propagation delay with less than 150 ps overdrive dispersion.

Dispersion, a measure of the difference in propagation delay

under differing overdrive conditions, is a particularly important

characteristic of high speed comparators. A separate

programmable hysteresis pin is available on the ADCMP552.

A differential input stage permits consistent propagation delay

with a common-mode range from –0.2 V to VCCI – 2.0 V.

Outputs are complementary digital signals are fully compatible

with PECL 10 K and 10 KH logic families. The outputs provide

sufficient drive current to directly drive transmission lines

terminated in 50 Ω to VCCO − 2 V. A latch input is included

and permits tracking, track-and-hold, or sample-and-hold

modes of operation. The latch input pins contain internal pull-

ups that set the latch in tracking mode when left open.

The ADCMP551/ADCMP552/ADCMP553 are specified over

the –40°C to +85°C industrial temperature range. The

ADCMP551 is available in a 16-lead QSOP package; the

ADCMP552 is available in a 20-lead QSOP package; and the

ADCMP553 is available in an 8-lead MSOP package.