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LTC6752-2 Datasheet(PDF) 18 Page - Linear Technology

Part # LTC6752-2
Description  280MHz, 2.9ns Comparator Family with Rail-to-Rail Inputs and CMOS Outputs
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC6752-2 Datasheet(HTML) 18 Page - Linear Technology

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LTC6752/LTC6752-1/
LTC6752-2/LTC6752-3/
LTC6752-4
18
6752fc
For more information www.linear.com/LTC6752
applicaTions inForMaTion
Input Protection
The input stage is protected against damage from condi-
tions where the voltage on either pin exceeds the supply
voltage (VCC to VEE) without external protection. External
input protection circuitry is only needed if input currents
can exceed the absolute maximum rating. For example,
if an input is taken beyond 300mV of either the positive
or negative supply, an internal ESD protection diode will
conduct and an external resistor should be used to limit
the current to less than 10mA.
Outputs
The LTC6752 family has excellent drive capability. The
comparators can deliver typically ±22mA output current
for an output supply of 2.5V, and ±39mA output current
for a 3.3V output supply. Attention must be paid to keep
the junction temperature of the IC below 150°C should the
output have a continuous short-circuit condition.
Logic Drive Capability
The LTC6752 family has been designed to drive CMOS
logic with a supply of 3.3V, 2.5V and 1.8V. For device reli-
ability,theoutputpowersupply(VDD)shouldnotbehigher
than 3.6V above the negative supply. When VDD is 3V or
higher the CMOS outputs of the LTC6752 family provide
valid TTL logic threshold levels and can easily interface
with TTL logic devices operating with a 5V supply. This is
possiblebecauseallofthethresholdlevelsassociatedwith
TTL logic (VIH/VIL/VOH/VOL) are less than or equal to 2.4V
Capacitive Loads
The LTC6752 family can drive capacitive loads. Transient
performance parameters in the Electrical Characteristics
Tables and Typical Characteristics section are for a load
of 5pF, corresponding to a standard TTL/CMOS load. The
devices are fully functional for larger capacitive loads,
howeverspeedperformancewilldegrade.Thegraphstitled
Propagation Delay vs Capacitive Load and Toggle Rate vs
CapacitiveLoadillustratetheimpactofchangestothetotal
capacitive load. For optimal speed performance, output
load capacitance should be reduced as much as possible.
ESD
The LTC6752 family members have reverse-biased ESD
protection diodes on pins as shown in Figure 1.
There are additional clamps between the positive and
negative supplies that further protect the device during
ESD strikes. Hot-plugging of the device into a powered
socketisnotrecommendedsincethiscantriggertheclamp
resultinginlargecurrentsflowingbetweenthesupplypins.
Hysteresis
Comparators have very high open-loop gain. With slow
input signals that are close to each other, input noise can
cause the output voltage to switch randomly. This can be
addressed by hysteresis which is positive feedback that
increases the trip point in the direction of the input signal
transition when the output switches. This pulls the inputs
away from each other, and prevents continuous switching
back and forth. The addition of positive feedback also has
theeffectofmakingthesmallsignalgaininfinitearoundthe
trip points. Hysteresis is designed into most comparators
and the LTC6752 family has adjustable hysteresis with a
default hysteresis of 5mV.
The input-output transfer characteristic is illustrated in
Figure 3 showing the definitions of VOS and HYST based
upon the two measurable trip points.
In some cases, additional noise immunity is required
above what is provided by the nominal 5mV hysteresis.
Figure 3
VOH
VOL
0
VOS =
6752 F03
VOUT
VOS
VTRIP+
VHYST
(= VTRIP+ – VTRIP–)
∆VIN = VIN+ – VIN–
VTRIP+ + VTRIP–
2
VTRIP–
FOR VTRIP+ = 3mV,
VTRIP– = –2mV,
VOS = 0.5mV,
VHYST = 5mV


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