Analog Devices AD53042 a Datasheet

a

2.8V

0.2V

3.0V

0V

0V

3.0V

MIN. POSITIVE

INPUT PULSE

MIN. NEGATIVE

INPUT PULSE

High Speed Window Comparator

AD53042

FEATURES
–2 V to +7 V Input Voltage Range
Low V

Bias Current (<100 nA)

IN

Up to 5 V/ns Input Signal Tracking
Low Dispersion of ⴞ100 ps
28-Lead PLCC Package

APPLICATIONS
Automatic Test Equipment
Semiconductor Test Systems
Board Test Systems

PRODUCT DESCRIPTION

The AD53042 is an ultrahigh speed window comparator
with latch. It uses a high speed monolithic process to provide
high dc accuracy without sacrificing input voltage range.
On-chip connection of the common input eliminates the
contributions of a second bonding pad and package pin to
the input capacitance, resulting in a maximum input
capacitance of 2 pF.

The AD53042 employs a high precision differential input
stage with a common mode range of 9 V. Its complementary
digital outputs are fully ECL-compatible. The output stage is

capable of driving a 50 Ω line terminated to –2 V. The device

also provides a latch function, allowing operation in track-hold
mode and can also be used to generate hysteresis.

FUNCTIONAL BLOCK DIAGRAM

GND

GND

V

A

NC

V

IN

NC

V

B

GND

NOTE:
NOT THE ACTUAL PHYSICAL LAYOUT OF DEVICE.
NC = NO CONNECTION INSIDE PACKAGE.

LEA

LATCH/OUTPUT

AD53042

LATCH/OUTPUT

LEB

LEA NC

A

B

LEB

NC

+V

S

–V

NC GNDGND

Figure 1. Typical Application Circuit

NC

GND

GND

QA

QA

DGND

QB

QB
GND

S

REV. A

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(All specifications apply with TC = 40ⴗC to 100ⴗC and +VS = +7.75 V to +11.5 V;

AD53042–SPECIFICATIONS

–VS = –3.95 V to –7.7 V unless otherwise noted.)

Parameter Min Typ Max Units Test Conditions

POWER SUPPLIES

Positive Supply Currents 65 mA No Load
Negative Supply Current –85 mA No Load
Power Dissipation 1.19 W No Load, +VS = +10 V, –VS = –5.2 V

DC INPUT CHARACTERISTICS

Offset Voltage (V

Bias Current –0.5 <0.1 0.5 µAV

V

IN

, V

Bias Current –20 20 µAV

V

A

B

Capacitance V
Voltage Range (V
Differential Voltage (V

) –10 10 mV CMV = 0 V

OS

, VA, V

IN

B

)–V

CM

)9V

DIFF

+ 2.7 +VS – 2.5 V

S

2pF

= 0 V

IN

= 0 V

IN

Nonlinearity –5 5 mV See Note 1
VA/VB Interaction 0.1 mV/V

BIAS CURRENT

Change vs. Comparator State –1 1 µA
Nonlinearity –2 2 µA
Tempco ±0.1 µA/°C

LATCH ENABLE INPUTS

Common-Mode Range –2 1 V
Differential Voltage 0.4 3 V
Logic “1” Current (L
Logic “0” Current (L

) 200 µA

IH

) –10 µA

IL

DIGITAL OUTPUTS

Logic “1” Voltage (V
Logic “0” Voltage (V

) –0.98 V Q or Q, 50 Ω to –2 V

OH

) –1.5 V Q or Q, 50 Ω to –2 V

OL

SWITCHING PERFORMANCE

Propagation Delay

Input to Output 2 ns V

= 2 V p-p, t

IN

PDR

, t

, Figure 1, Note 2

PDF

Latch Enable to Output 1.2 ns
Part-to-Part Skew 1 ns

Change vs. Temperature ±1 ps/°C

DISPERSION

5 V p-p Input (All Edges) ±100 ps 10%, 90% 0.5 V/ns, 3 V/ns
5 V p-p Input (All Edges) ±175 ps 10%, 90% 5 V/ns
V Slew = 1 V/ns (All Edges) ±50 ps 10%, 90% 3 V, 5 V
V Slew = 1 V/ns (All Edges) ±50 ps 20%, 80% 1 V

Minimum Pulsewidth <1 ns See Note 3
Edge Interaction <200 ps See Note 4
Duty Ratio <100 ps See Note 5
Comparator Interaction <100 ps

NOTES

1

Defined as change in VOS from –VS + 2.95 V to +VS – 2.75 V (throughout the range) after VA and VB are corrected for gain and offset using 0 V and 5 V.

2

Propagation delay is measured from the input threshold crossing at the 50% point of a 0 V to 5 V input to the output Q and Q crossing.

3

The minimum input pulsewidth that will maintain a 600 mV ECL swing on the output. The input is a 0 V to 3 V signal with a 3 V/ns rise and fall times. The input
pulsewidth is measured between the 2.8 V point of a positive input pulse and the 0.2 V of a negative input pulse. See Figure 2.

4

Maximum Change in propagation delay as the input pulse is reduced from 50 ns to a 2 ns pulsewidth. 0 V to 3 V swing with 3 V/ns rise/fall time and 25% duty cycle.

5

Maximum Change in propagation delay as the input pulse is reduced from 99% to a 1% duty cycle. 0 V to 3 V swing with 3 V/ns rise/fall time and 50 ns to 4.95 µs
pulsewidth, period = 5 µs.

Specifications subject to change without notice.

–2–

REV. A