LTC6754ISC6#TRMPBF datasheet(10/22 Pages) AD

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LTC6754

6754f

For more information www.linear.com/LTC6754

pin FuncTions

+IN (Pin 3/Pin 4): Positive Input of the Comparator.

The voltage range of this pin can go from VEE (–0.2V)

to VCCI (+0.1V).

–IN (Pin 4/Pin 5): Negative Input of the Comparator.

The voltage range of this pin can go from VEE (–0.2V)

to VCCI (+0.1V).

VCCI (Pin 5/Pin 2): Positive Supply Voltage for the Input

Stage. The voltage between VCCI and VEE should be be-

tween 2.4V and 5.25V. This pin is combined with VCCO in

the SC70 package.

VCCO (Pin 5/Pin 1): Positive Supply Voltage for the LVDS

Output Stage. See the section High Speed Board Design

Techniquesforproperpowersupplylayoutandbypassing.

The voltage between VCCO and VEE should be between

2.4V and 5.25V.This pin is combined with VCCI in the

SC70 package.

VEE (Pin 2/Pins 3, 9): Negative Power Supply, normally

tied to ground. This can be tied to a voltage other than

ground as long as the constraints for total supply voltage

relative to VCCI/VCCO are maintained.

SHDN (Pin 7) UD Only: Active Low Comparator Shut-

down, threshold is 0.8V above VEE. If left unconnected,

the comparator will be fully powered up.

LE/HYST (Pin 8) UD Only: This pin allows the user to

adjust the comparator’s hysteresis as well as latch the

output if the pin voltage is pulled to within 400mV above

VEE. Hysteresis can be increased or disabled by voltage,

current or a resistor to VEE. Leaving the pin unconnected

results in a typical hysteresis of 4.5mV.

Q(Pin1/Pin12):PositiveComparatorOutput.Whenthecom-

paratoroutputsaredifferentiallyloadedwitha100Ωresistor,

Q swings to VOCM + VOD / 2 when +IN > –IN and

VOCM – VOD / 2 when +IN < –IN, where VOCM and VOD are

typically 1.26V and 360mV respectively for a supply of 5V.

Q(Pin6/Pin10):NegativeComparatorOutput.Whenthecom-

paratoroutputsaredifferentiallyloadedwitha100Ωresistor,

Q swings to VOCM + VOD / 2 when +IN < –IN and

VOCM – VOD / 2 when +IN > –IN, where VOCM and VOD are

typically 1.26V and 360mV respectively for a supply of 5V.

block DiagraM

VCCI

VEE

6754 BD

VEE

VCCI

VEE

–IN

VCCI

VEE

VCCI

+IN

–

INPUT

STAGE

HYSTERESIS STAGE

–

GAIN

STAGE

LE/HYST

SHDN

LE/HYST PIN INTERFACE

14.5k

1.25V

350k

+–

OUTPUT CURRENT

DRIVER STAGE

1.26V

COMMON

MODE

DETECTOR

I = 3.6mA, +IN < –IN

I = –3.6mA, +IN > –IN

VEE

VCCO

VEE

VCCO

ERROR

AMPLIFIER

Q + Q

Figure 1.

(SC70/QFN)

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