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ADCMP552BRQ
Single Supply High Speed PECL Comparators
Single Supply High Speed PECL ComparatorsRev. PrB
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
INPUTFigure 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.
TABLE OF CONTENTS Specifications.....................................................................................3
Absolute Maximum Ratings............................................................5
Thermal Considerations..............................................................5
ESD Caution..................................................................................5
Pin Configuration and Function Descriptions.............................6
Typical Performance Characteristics.............................................8
Timing Information.......................................................................10
Application Information................................................................11
Clock Timing Recovery.............................................................11
Optimizing High Speed Performance.....................................11
Comparator Propagation Delay Dispersion...........................11
Comparator Hysteresis..............................................................12
Minimum Input Slew Rate Requirement................................12
Typical Application Circuits.........................................................13
Outline Dimensions.......................................................................14
Ordering Guide..........................................................................14
REVISION HISTORY Revision PrA: Preliminary Version
SPECIFICATIONS VCCI = 3.3 V, VCCO = 3.3 V, TA = 25°C, unless otherwise noted.
Table 1. ADCMP551/ADCMP552/ADCMP553 Electrical Characteristics
ABSOLUTE MAXIMUM RATINGS
Table 2. Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may
affect device reliability.
THERMAL CONSIDERATIONS The ADCMP551 16-lead QSOP package has a θJA (junction-to-
ambient thermal resistance) of TBD°C/W in still air.
The ADCMP552 20-lead QSOP package has a θJA (junction-to-
ambient thermal resistance) of TBD°C/W in still air.
The ADCMP553 8-lead MSOP package has a θJA (junction-to-
ambient thermal resistance) of TBD°C/W in still air.
ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS ADCMP551
TOP VIEW(Not to Scale)
–INA
+INA
VCCO
VCCI
LEA
LEA
–INB
+INB
VCCO
AGND
LEB
LEB
ADCMP552
TOP VIEW(Not to Scale)
–INA
VCCO
VCCI
LEA
LEA
VCCO
+INA
–INB
VCCO
AGND
LEB
LEB
VCCO
+INB
HYSB
ADCMP553
TOP VIEW(Not to Scale)
LEA
LEA
+INA
–INA
Figure 2. ADCMP551 16-Lead QSOP Pin
Configuration
Figure 3. ADCMP552 20-Lead QSOP Pin
Configuration
Figure 4. ADCMP553 8-Lead MSOP Pin Configuration
Table 3. ADCMP551/ADCMP552/ADCMP553 Pin Function Descriptions
