Ultrafast 3.3 V/5 V

Single-Supply SiGe Comparators

ADCMP572/ADCMP573

Rev. A

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FEATURES

3.3 V/5.2 V single-supply operation

150 ps propagation delay

15 ps overdrive and slew rate dispersion

8 GHz equivalent input rise time bandwidth

80 ps minimum pulse width

35 ps typical output rise/fall

10 ps deterministic jitter (DJ)

200 fs random jitter (RJ)

On-chip terminations at both input pins

Robust inputs with no output phase reversal

Resistor-programmable hysteresis

Differential latch control

Extended industrial −40°C to +125°C temperature range

APPLICATIONS

Clock and data signal restoration and level shifting

Automatic test equipment (ATE)

High speed instrumentation

Pulse spectroscopy

Medical imaging and diagnostics

High speed line receivers

Threshold detection

Peak and zero-crossing detectors

High speed trigger circuitry

FUNCTIONAL BLOCK DIAGRAM

INPUT

INPUT

LE INPUT

HYS

Q OUTPUT

Q OUTPUT

LE INPUT

ADCMP572

ADCMP573

CML/

RSPECL

Figure 1.

GENERAL DESCRIPTION

The ADCMP572 and ADCMP573 are ultrafast comparators

fabricated on Analog Devices’ proprietary XFCB3 Silicon

Germanium (SiGe) bipolar process. The ADCMP572 features

CML output drivers and latch inputs, and the ADCMP573

features reduced swing PECL (RSPECL) output drivers and

latch inputs.

Both devices offer 150 ps propagation delay and 80 ps

minimum pulse width for 10 Gbps operation with 200 fs rms

random jitter (RJ). Overdrive and slew rate dispersion are

typically less than 15 ps.

A flexible power supply scheme allows both devices to operate

with a single 3.3 V positive supply and a −0.2 V to +1.2 V input

signal range or with split input/output supplies to support a

wider −0.2 V to +3.2 V input signal range and an independent

range of output levels. 50 Ω on-chip termination resistors are

provided at both inputs with the optional capability to be left

open (on an individual pin basis) for applications requiring

high impedance inputs.

The CML output stage is designed to directly drive 400 mV into

50 Ω transmission lines terminated to between 3.3 V to 5.2 V.

The RSPECL output stage is designed to drive 400 mV into

commonly used PECL logic families. The comparator input

stage offers robust protection against large input overdrive, and

the outputs do not phase reverse when the valid input signal

range is exceeded. High speed latch and programmable

hysteresis features are also provided.

The ADCMP572 and ADCMP573 are available in a 16-lead

LFCSP package and have been characterized over an extended

industrial temperature range of −40°C to +125°C.