Ultrafast SiGe

Voltage Comparators

ADCMP580/ADCMP581/ADCMP582

Rev. A

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FEATURES

180 ps propagation delay

25 ps overdrive and slew rate dispersion

8 GHz equivalent input rise time bandwidth

100 ps minimum pulse width

37 ps typical output rise/fall

10 ps deterministic jitter (DJ)

200 fs random jitter (RJ)

−2 V to +3 V input range with +5 V/−5 V supplies

On-chip terminations at both input pins

Resistor-programmable hysteresis

Differential latch control

Power supply rejection > 70 dB

APPLICATIONS

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

Clock and data signal restoration

FUNCTIONAL BLOCK DIAGRAM

INPUT

INPUT

LE INPUT

HYS

Q OUTPUT

Q OUTPUT

LE INPUT

ADCMP580/

ADCMP581/

ADCMP582

CML/ECL/

PECL

Figure 1.

GENERAL DESCRIPTION

The ADCMP580/ADCMP581/ADCMP582 are ultrafast voltage

comparators fabricated on the Analog Devices, Inc. proprietary

XFCB3 Silicon Germanium (SiGe) bipolar process. The

ADCMP580 features CML output drivers, the ADCMP581

features reduced swing ECL (negative ECL) output drivers, and

the ADCMP582 features reduced swing PECL (positive ECL)

output drivers.

All three comparators offer 180 ps propagation delay and 100 ps

minimum pulse width for 10 Gbps operation with 200 fs random

jitter (RJ). Overdrive and slew rate dispersion are typically less

than 15 ps.

The ±5 V power supplies enable a wide −2 V to +3 V input

range with logic levels referenced to the CML/NECL/PECL

outputs. The inputs have 50 Ω on-chip termination resistors

with the optional capability to be left open (on an individual

pin basis) for applications requiring high impedance input.

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

50 Ω transmission lines terminated to ground. The NECL output

stages are designed to directly drive 400 mV into 50 Ω terminated

to −2 V. The PECL output stages are designed to directly drive

and programmable hysteresis are also provided. The differential

latch input controls are also 50 Ω terminated to an independent

The ADCMP580/ADCMP581/ADCMP582 are available in a

16-lead LFCSP_VQ.