LINEAR TECHNOLOGY LT1715 Technical data

LT1715

4ns, 150MHz

Dual Comparator with

Independent Input/Output Supplies

FEATURES

UltraFast: 4ns at 20mV Overdriven

150MHz Toggle Frequency

Separate Input and Output Power Supplies

Low Power: 4.6mA per Comparator at 3V

Pinout Optimized for High Speed Use

Output Optimized for 3V and 5V Supplies

TTL/CMOS Compatible Rail-to-Rail Output

Input Voltage Range Extends 100mV

Below Negative Rail

Internal Hysteresis with Speciﬁ ed Limits

Speciﬁ ed for –40°C to 125°C Temperature Range

Available in the 10-pin MSOP Package

APPLICATIONS

High Speed Differential Line Receivers

Level Translators

Window Comparators

Crystal Oscillator Circuits

Threshold Detectors/Discriminators

High Speed Sampling Circuits

Delay Lines

DESCRIPTION

The LT®1715 is an UltraFast™ dual comparator optimized for low voltage operation. Separate supplies allow independent analog input ranges and output logic levels with no loss of performance. The input voltage range extends from 100mV below V LT1715 easy to use even with slow moving input signals. The rail-to-rail outputs directly interface toTTL and CMOS. The symmetric output drive results in similar rise and fall times that can be harnessed for analog applications or for easy translation to other single supply logic levels.

The LT1715 is available in the 10-pin MSOP package. The pinout of the LT1715 minimizes parasitic effects by placing the most sensitive inputs away from the outputs, shielded by the power rails.

For a dual/quad single supply comparator with similar propagation delay, see the LT1720/LT1721. For a single comparator with similar propagation delay, see the LT1719.

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation.

to 1.2V below VCC. Internal hysteresis makes the

TYPICAL APPLICATION

100MHz Dual Differential Line Receiver

5V 3V

IN A

–

IN B

–

–5V

1715 TA01

OUT A

OUT B

CLOCK OUT

DATA OUT

Line Receiver Response to 100MHz Clock,

50MHz Data Both with 25mV

FET PROBES

5ns/DIV

P-P

Inputs

1715 TA02

1V/DIV

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LT1715

(Note 1)

Supply Voltage

to GND .............................................................7V

to VEE ..........................................................13.2V

to GND ......................................... –13.2V to 0.3V

Input Current (+IN, –IN) .......................................±10mA

Output Current (Continuous) ...............................±20mA

Operating Temperature Range (Note 2)

LT1715C ............................................... –40°C to 85°C

LT1715I ................................................ –40°C to 85°C

LT1715H ............................................–40°C to 125°C

Speciﬁ ed Temperature Range (Note 3)

LT1715C ................................................... 0°C to 70°C

LT1715I ................................................ –40°C to 85°C

LT1715H ............................................ –40°C to 125°C

Junction Temperature ........................................... 150°C

Storage Temperature Range ................... –65°C to 150°C

Lead Temperature (Soldering, 10 sec) ..................300°C

PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS

TOP VIEW

+IN A –IN A –IN B +IN B

10-LEAD PLASTIC MSOP

= 150°C, θJA = 120°C/W (NOTE 4)

JMAX

2 3 4 5

MS PACKAGE

OUT A

OUT B

GND

ORDER INFORMATION

LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE

LT1715CMS#PBF LT1715CMS#TRPBF LTVQ 10-Lead Plastic MSOP 0°C to 70°C

LT1715IMS#PBF LT1715IMS#TRPBF LTVV 10-Lead Plastic MSOP –40°C to 85°C

LT1715HMS#PBF LT1715HMS#TRPBF LTVV 10-Lead Plastic MSOP –40°C to 125°C

Consult LTC Marketing for parts speciﬁ ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based ﬁ nish parts.

For more information on lead free part marking, go to: For more information on tape and reel speciﬁ cations, go to:

The l denotes the speciﬁ cations which apply over the full operating

ELECTRICAL CHARACTERISTICS

temperature range, otherwise speciﬁ cations are at T unless otherwise speciﬁ ed.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

CMR

TRIP

– V

–

Input Supply Voltage

Output Supply Voltage

Input Voltage Range (Note 5)

Input Trip Points (Note 6) LT1715C, LT1715I

http://www.linear.com/leadfree/

http://www.linear.com/tapeandreel/

= 25°C. VCC = 5V, VEE = –5V, +VS = 5V, VCM = 1V, C

LT1715H

= 10pF, V

OUT

2.7 12 V

2.7 6 V

VEE – 0.1 VCC – 1.2 V

–1.5

–1.8

–5.5

–6

OVERDRIVE

5.5 6

1.5

1.8

= 20mV,

mV mV

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LT1715

ELECTRICAL CHARACTERISTICS

The l denotes the speciﬁ cations which apply over the full operating temperature range, otherwise speciﬁ cations are at T

= 25°C. VCC = 5V, VEE = –5V, +VS = 5V, VCM = 1V, C

unless otherwise speciﬁ ed.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

HYST

VOS/ΔT Input Offset Voltage Drift

CMRR Common Mode Rejection Ratio (Note 7) LT1715C, LT1715I

PSRR Power Supply Rejection Ratio (Note 8)

MAX

PD20

PD5

SKEW

Δt

JITTER

Input Offset Voltage (Note 6)

LT1715C, LT1715I LT1715H

Input Hysteresis Voltage (Note 6) LT1715C, LT1715I

LT1715H

Input Bias Current LT1715C, LT1715I

LT1715H

Input Offset Current LT1715C, LT1715I

LT1715H

l l

Voltage Gain (Note 9) ∞

Output High Voltage I

Output Low Voltage I

= 4mA, VIN = V

SOURCE

= 10mA, VIN = V

SINK

TRIP

+ 20mV

–

– 20mV

+VS – 0.4 V

Maximum Toggle Frequency (Note 10) 150 MHz

Propagation Delay V

OVERDRIVE

LT1715H

OVERDRIVE

LT1715C, LT1715I LT1715H

Propagation Delay V

OVERDRIVE

Propagation Delay Skew (Note 13) Between t

Differential Propagation Delay (Note 14) Between Channels

= 20mV (Note 11),

= 5V, VEE = –5V LT1715C, LT1715I

l l

= 20mV, VCC = 5V, VEE = 0V 4.4 ns

= 20mV, VCC = 3V, VEE = 0V

l l

= 5mV, VEE = 0V (Notes 11, 12)

–

, VEE = 0V

Output Rise Time 10% to 90% 2 ns

Output Fall Time 90% to 10% 2 ns

Output Timing Jitter VIN = 1.2V

f = 20MHz (Note 15) t

Positive Input Stage Supply Current (per Comparator)

+VS = VCC = 5V, VEE = –5V LT1715C, LT1715I LT1715H

+VS = VCC = 3V, VEE = 0V LT1715C, LT1715I LT1715H

Negative Input Stage Supply Current (per Comparator)

+VS = VCC = 5V, VEE = –5V LT1715C, LT1715I LT1715H

+VS = VCC = 3V, VEE = 0V LT1715C, LT1715I LT1715H

Positive Output Stage Supply Current (per Comparator)

+VS = VCC = 5V, VEE = –5V LT1715C, LT1715I LT1715H

VS = VCC = 3V, VEE = 0V LT1715C, LT1715I LT1715H

(6dBm), ZIN = 50 t

P-P

PD PD

+ –

l l

= 10pF, V

OUT

OVERDRIVE

= 20mV,

0.4 2.5

3.5 4

2 2

3.5 6 7

10 μV/°C

–6 –7

–2.5 0

0.2 0.6 1

70 dB

65 80 dB

0.4 V

2.8

3 3 3

7 8

4.8 6.5

7.5 8

6912ns

0.5 1.5 ns

0.3 1 ns

15 11

ps ps

2.2

0.9 1.6

1.8

–4.8

–2.9 mA

–5.3

–3.8

–2.4 mA

–4.3

4.6 7.5 8

3.7 6

6.5

mV mV mV

mV mV

μA μA

RMS RMS

mA mA

ns ns ns

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LT1715

ELECTRICAL CHARACTERISTICS

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: The LT1715C is guaranteed functional over the operating range of –40°C to 85°C.

Note 3: The LT1715C is guaranteed to meet speciﬁ ed performance from 0°C to 70°C. The LT1715°C is designed, characterized and expected to meet speciﬁ ed performance from –40°C to 85°C but is not tested or QA sampled at these temperatures. The LT1715I is guaranteed to meet speciﬁ ed performance from –40°C to 85°C. The LT1715H is guaranteed to meet speciﬁ ed performance from –40°C to 125°C.

Note 4: Thermal resistances vary depending upon the amount of PC board metal attached to Pin 5 of the device. θ FR-4 board covered with 2oz copper on both sides and with 100mm

is speciﬁ ed for a 2500mm2 3/32"

of copper attached to Pin 5. Thermal performance can be improved beyond the given speciﬁ cation by using a 4-layer board or by attaching more metal area to Pin 5.

Note 5: 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 6: The LT1715 comparator includes internal hysteresis. The trip points are the input voltage needed to change the output state in each direction. The offset voltage is deﬁ ned as the average of V

TRIP

and V

TRIP

–

while the hysteresis voltage is the difference of these two. Note 7: The common mode rejection ratio is measured with V

= –5V and is deﬁ ned as the change in offset voltage measured from

= –5.1V to VCM = 3.8V, divided by 8.9V.

= 5V,

Note 8: The power supply rejection ratio is measured with VCM = 1V and is deﬁ ned as the worst of: the change in offset voltage from V to V

= +VS = 6V (with VEE = 0V) divided by 3.3V or the change in offset

voltage from V

= 0V to VEE = –6V (with VCC = +VS = 6V) divided by 6V.

= +VS = 2.7V

Note 9: Because of internal hysteresis, there is no small-signal region in which to measure gain. Proper operation of internal circuity is ensured by measuring V

and VOL with only 20mV of overdrive.

Note 10: Maximum toggle rate is deﬁ ned as the highest frequency at which a 100mV sinusoidal input results in an error free output toggling to greater than 4V when high and to less than 1V when low on a 5V output supply.

Note 11: Propagation delay measurements made with 100mV steps. Overdrive is measured relative to V

Note 12: t

cannot be measured in automatic handling equipment with

TRIP

low values of overdrive. The LT1715 is 100% tested with a 100mV step and 20mV overdrive. Correlation tests have shown that t

limits can be

guaranteed with this test. Note 13: Propagation Delay Skew is deﬁ ned as:

SKEW

= |t

PDLH

– t

PDHL

Note 14: Differential propagation delay is deﬁ ned as the larger of the two: Δt Δt

PDLH PDHL

= |t = |t

PDLHA PDHLA

– t – t

PDLHB PDHLB

| |

Note 15: Package inductances combined with asynchronous activity on the other channel can increase the output jitter. See Channel Interactions in Applications Information. Speciﬁ cation above is with one channel active only.

TYPICAL PERFORMANCE CHARACTERISTICS

Input Offset and Trip Voltages vs Supply Voltage

–1

AND TRIP POINT VOLTAGE (mV)

TA = 25°C

–2

= 1V

= GND

–3

2.5

3.0 3.5 SUPPLY VOLTAGE, VCC = +VS (V)

4.0 5.0

TRIP

–

TRIP

4.5 5.5 6.0

1715 G01

Input Offset and Trip Voltages vs Temperature

+VS = VCC = 5V

= 1V

= –5V

–1

AND TRIP POINT VOLTAGE (mV)

–2

–3

–20 20 60 100

TEMPERATURE (°C)

TRIP

–

TRIP

1715 G02

Input Common Mode Limits vs Temperature

4.2 +VS = VCC = 5V

= –5V

4.0

3.8

3.6

–4.8

–5.0

–5.2

COMMON MODE INPUT VOLTAGE (V)

–5.4

–50

140–40–60 0 40 80 120

–25 0

TEMPERATURE (°C)

50 100 125

25 75

1715 G03

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TYPICAL PERFORMANCE CHARACTERISTICS

LT1715

Input Current vs Differential Input Voltage

TA = 25°C

= +VS = 5V

= –5V

–1

–2

–3

INPUT BIAS (μA)

–4

–5

–6

–7

–4 –3 –2 –1 0 5

–5

DIFFERENTIAL INPUT VOLTAGE (V)

Output Low Voltage vs Load Current

0.5 VCC = +VS = 5V, UNLESS

OTHERWISE NOTED

= –10mV

0.4

0.3

–55°C

0.2

OUTPUT VOLTAGE (V)

0.1

OUTPUT SINK CURRENT (mA)

1234

125°C

= 2.7V

125°C

25°C

1715 G04

1715 G07

Quiescent Supply Current vs Temperature

VCC = +VS = 5V

= –5V

–2

–4

SUPPLY CURRENT PER COMPARATOR (mA)

–6

–25 0 50

–50

TEMPERATURE (°C)

75 100 125

1715 G05

Output High Voltage vs Load Current

–0.1

(V)

–0.2

–55°C

–0.3

–0.4

–0.5

OUTPUT VOLTAGE RELATIVE TO +V

–0.6

OUTPUT SOURCE CURRENT (mA)

VCC = +VS = 5V, UNLESS OTHERWISE NOTED

= 10mV

125°C

= 2.7V

25°C

1715 G08

Quiescent Supply Current vs Supply Voltage

TA = 25°C

= GND

–1

–2

–3

SUPPLY CURRENT PER COMPARATOR (mA)

–4

SUPPLY VOLTAGE, VCC = +VS (V)

IS, OUTPUT HIGH

IS, OUTPUT LOW

IEE, OUTPUT LOW

IEE, OUTPUT HIGH

1715 G06

Supply Current vs Toggle Frequency

TOTAL SUPPLY CURRENT PER COMPARATOR (mA)

VALID

TOGGLING

= 20pF

LOAD

25 75

TOGGLE FREQUENCY (MHz)

INCOMPLETE OUTPUT TOGGLING

LOAD

= 0pF

LOAD

TA = 25°C

= ±50mV SINUSOID

= VCC = 5V

= GND

175

125 225

150

100

= 10pF

200

1715 G09

Propagation Delay vs Overdrive

VCC = +VS = 3V

= 0V

PROPAGATION DELAY (ns)

VCC = +VS = 5V

= –5V

10 20 40

OVERDRIVE (mV)

TA = 25°C V C

STEP LOAD

PDLH

PDHL

= 100mV

= 10pF

PDLH

PDHL

1715 G10

8.0

7.5

7.0

6.5

6.0

5.5

5.0

4.5

PROPAGATION DELAY (ns)

4.0

3.5

3.0

Propagation Delay vs Temperature

PDLH

= 100mV

STEP

OVERDRIVE = 5mV

OVERDRIVE = 20mV

–25 0 50

–50

LOAD

TEMPERATURE (°C)

= 10pF

VCC = +VS = 3V

= 0V

VCC = +VS = 5V

= –5V

75 100 125

1715 G11

Propagation Delay vs Supply Voltage

5.5

5.0

4.5

4.0

PROPAGATION DELAY (ns)

3.5

2.5

3.0 3.5

SUPPLY VOLTAGE, +V

TA = 25°C

= 100mV

STEP

OVERDRIVE = 20mV

= 10pF

LOAD

PDLH

PDHL

PDLH

PDHL

4.5 5.5 6.0

4.0 5.0 = VCC OR V+ (V)

VEE = GND

VEE = –5V

1715 G12

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LT1715

TYPICAL PERFORMANCE CHARACTERISTICS

Maximum Toggle Rate vs Input Amplitude

180

TA = 25°C

= VCC = 5V

160

= GND

140

120

100

TOGGLE FREQUENCY (MHz)

= 10pF

LOAD

INPUT SINUSOID AMPLITUDE (mV)

Maximum Toggle Rate vs Load Capacitance

250

225

200

175

150

125

100

TOGGLE FREQUENCY (MHz)

10 20 30 503551525 45

OUTPUT CAPACITANCE (pF)

10 100

1715 G13

TA = 25°C

= ±50mV SINUSOID

= VCC = 5V

= GND

1715 G16

Maximum Toggle Rate vs Temperature

250

TA = 25°C

230

= ±50mV SINUSOID

= VCC = 5V

210

= –5V

= 10pF

LOAD

190

170

150

130

110

TOGGLE FREQUENCY (MHz)

–50

LOAD

= 500Ω

–25

TEMPERATURE (°C)

Propagation Delay vs Load Capacitance

TA = 25°C

= 100mV

STEP

OVERDRIVE = 20mV

= VCC = 5V

= –5V

PROPAGATION DELAY (ns)

RISING EDGE

PDLH

10 20 40

OUTPUT LOAD CAPACITANCE (pF)

)

FALLING EDGE

)

PDHL

100

1715 G17

1715 G14

25mV

Maximum Toggle Rate vs Supply Voltage

250

225

200

175

TOGGLING FROM

20% TO 80% OF +V

150

125

100

TA = 25°C

TOGGLE FREQUENCY (MHz)

125

= ±50mV SINUSOID

= GND

LOAD

= 10pF

+VS = VCC SUPPLY VOLTAGE (V)

Response to 150MHz 25mV Sine Wave Driving 10pF

P-P

OUT A

FET PROBES

= 5V

= –5V

= 5V

= 0V

2.5ns/DIV

TOGGLING FROM 1V TO +V

– 1V

P-P

1715 G18

1715 G15

20mV/DIV

1V/DIV

PIN FUNCTIONS

+IN A (Pin 1): Noninverting Input of Comparator A.

–IN A (Pin 2): Inverting Input of Comparator A.

–IN B (Pin 3): Inverting Input of Comparator B.

+IN B (Pin 4): Noninverting Input of Comparator B.

(Pin 5): Negative Supply Voltage for Input Stage and

Substrate.

GND (Pin 6): Ground for Output Stage.

OUT B (Pin 7): Output of Comparator B.

OUT A (Pin 8): Output of Comparator A.

(Pin 9): Positive Supply Voltage for Output Stage.

(Pin 10): Positive Supply Voltage for Input Stage.

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LINEAR TECHNOLOGY LT1715 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual