LT1721IGN datasheet(4/28 Pages) LINER

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LT1720/LT1721

17201fc

TYPICAL PERFORMANCE CHARACTERISTICS

SUPPLY VOLTAGE (V)

2.5

–1

–2

–3

4.0

5.0

17201 G01

3.0

3.5

4.5

5.5

6.0

VTRIP

VOS

VTRIP

–

25°C

VCM = 1V

TEMPERATURE (°C)

–3

–1

–2

–25

100

17201 G02

–50

125

VTRIP

VOS

VTRIP

–

TEMPERATURE (°C)

–50

3.6

3.8

4.2

17201 G03

0.2

–25

100

125

–0.2

–0.4

4.0

VCC = 5V

Input Offset and Trip Voltages

vs Supply Voltage

Input Offset and Trip Voltages

vs Temperature

Input Common Mode Limits

vs Temperature

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: If one input is within these common mode limits, the other input

can go outside the common mode limits and the output will be valid.

Note 3: The LT1720/LT1721 comparators include internal hysteresis.

The trip points are the input voltage needed to change the output state in

each direction. The offset voltage is deﬁned as the average of VTRIP+ and

VTRIP–, while the hysteresis voltage is the difference of these two.

Note 4: The common mode rejection ratio is measured with VCC = 5V

and is deﬁned as the change in offset voltage measured from VCM = –0.1V

to VCM = 3.8V, divided by 3.9V.

Note 5: The power supply rejection ratio is measured with VCM = 1V and

is deﬁned as the change in offset voltage measured from VCC = 2.7V to

VCC = 6V, divided by 3.3V.

ELECTRICAL CHARACTERISTICS The l denotes speciﬁcations that apply over the full operating temperature

range, otherwise speciﬁcations are at TA = 25°C. VCC = 5V, VCM = 1V, COUT = 10pF, VOVERDRIVE = 20mV, unless otherwise speciﬁed.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ΔtPD

Differential Propagation Delay

(Note 9) Between Channels

0.3

1.0

tSKEW

Propagation Delay Skew

(Note 10) Between tPDLH/tPDHL

0.5

1.5

Output Rise Time

10% to 90%

2.5

Output Fall Time

90% to 10%

2.2

tJITTER

Output Timing Jitter

VIN = 1.2VP-P (6dBm), ZIN = 50Ω

tPDLH

VCM = 2V, f = 20MHz

tPDHL

psRMS

fMAX

Maximum Toggle Frequency

VOVERDRIVE = 50mV, VCC = 3V

VOVERDRIVE = 50mV, VCC = 5V

70.0

62.5

MHz

Note 6: Because of internal hysteresis, there is no small-signal region

in which to measure gain. Proper operation of internal circuity is ensured

by measuring VOH and VOL with only 10mV of overdrive.

Note 7: Propagation delay measurements made with 100mV steps.

Overdrive is measured relative to VTRIP±.

Note 8: tPD cannot be measured in automatic handling equipment with

low values of overdrive. The LT1720/LT1721 are 100% tested with a

100mV step and 20mV overdrive. Correlation tests have shown that

tPD limits can be guaranteed with this test, if additional DC tests are

performed to guarantee that all internal bias conditions are correct.

Note 9: Differential propagation delay is deﬁned as the larger of the two:

ΔtPDLH = tPDLH(MAX) – tPDLH(MIN)

ΔtPDHL = tPDHL(MAX) – tPDHL(MIN)

where (MAX) and (MIN) denote the maximum and minimum values

of a given measurement across the different comparator channels.

Note 10: Propagation Delay Skew is deﬁned as:

tSKEW = |tPDLH – tPDHL|

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