Rail-to-Rail, Fast, Low Power, 2.5 V to 5.5 V,

Single-Supply TTL/CMOS Comparators

Preliminary Technical Data

ADCMP608/ACMP609

Rev. PrA

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FUNCTIONAL BLOCK DIAGRAMS

FEATURES

NONINVERTING

INPUT

INVERTING

INPUT

Q OUTPUT

Q OUTPUT

ADCMP609

+

–

LE/HYS

ADCMP608

NONINVERTING

INPUT

INVERTING

INPUT

Q OUTPUT

+

–

Low glitch CMOS-/TTL-compatible output stage

30 ns propagation delay

1 mW at 2.5 V

Shutdown pin

Single-pin control for programmable hysteresis and latch

Power supply rejection >60 dB

−40C° to +125C° operation

APPLICATIONS

High speed instrumentation

Clock and data signal restoration

Logic level shifting or translation

High speed line receivers

Threshold detection

Peak and zero-crossing detectors

Figure 1.

High speed trigger circuitry

Pulse-width modulators

Current-/voltage-controlled oscillators

GENERAL DESCRIPTION

The ADCMP608 and ADCMP609 are fast comparators

fabricated on Analog Devices’ proprietary XFCB2 process.

These comparators are exceptionally versatile and easy to use.

low noise, TTL-/CMOS-compatible output drivers, and latch

inputs with adjustable hysteresis and/or shutdown inputs.

The TTL-/CMOS-compatible output stage is designed to drive

up to 15 pF with full rated timing specs and to degrade in a

graceful and linear fashion as additional capacitance is added.

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 in a

unique single-pin control option.

The devices offer 30 ns propagation delays driving a 15 pF load

with 5 mV overdrive on 350/400 μA typical supply current. A

flexible power supply scheme allows the devices to operate with

a single +2.5 V positive supply and a −0.5 V to +3.0 V input

signal range up to a +5.5 V positive supply with a −0.5 V to +6V

input signal range. Split input/output supplies, with no

sequencing restrictions on the ADCMP609, support a wide

input signal range while allowing independent output swing

control.

The ADCMP608 is available in a tiny 6-lead SC70 package with

single-ended output and a shutdown pin.

The ADCMP609, available in an 8-lead MSOP package, features

a shutdown pin, single pin latch, and hysteresis control.

+