National Semiconductor LMH7220 Technical data

LMH7220 High Speed Comparator with LVDS Output

May 29, 2008

General Description

The LMH7220 is a high speed, low power comparator with an operating supply voltage range of 2.7V to 12V. The LMH7220 has a differential, LVDS output, driving 325 mV into a 100Ω symmetrical transmission line. The LMH7220 has a 2.9 ns propagation delay and 0.6 ns rise and fall times while the supply current is only 6.8 mA at 5V (load current excluded).

The LMH7220 inputs have a voltage range that extends 200 mV below ground, allowing ground sensing applications. The LMH7220 is available in both the 6-Pin TSOT and SC-70 packages. These packages are ideal where space is a critical item.

Typical Schematic

Features

(VS = 5V TA = 25°C, Typical values unless otherwise specified)

Propagation delay @ 100 mV overdrive 2.9 ns

■

Rise and fall times 0.6 ns

■

Supply voltage 2.7V to 12V

■

Supply current 6.8 mA

■

Temperature range −40°C to 125°C

■

LVDS output

■

Applications

Acquisition trigger

■

Fast differential line receiver

■

Pulse height analyzer

■

Peak detector

■

Pulse width modulator

■

Remote threshold detection

■

Oscilloscope triggering

■

20137603

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/

LMH7220

Distributors for availability and specifications.

ESD Tolerance (Note 2) Human Body Model 2.5 kV Machine Model 250V Supply Voltage (VCC - GND)

Differential Input Voltage ±13V Output Shorted to GND (Note 4) Continuous

13.5V

Storage Temperature Range −65°C to +150°C Voltage on any I/O Pin GND−0.2V to VCC+0.2V

Junction Temperature (Note 3) 150°C max

Operating Ratings (Note 1)

Temperature Range (Note 3) −40°C to +125°C Supply Voltage 2.7V to 13V

Package Thermal Resistance (θJA )

6-Pin TSOT 189°C/W 6-Pin SC-70 450°C/W

Output Shorted Together (Note 4) Continuous

+12V DC Electrical Characteristics

Unless otherwise specified, all limits are guaranteed for TJ = 25°C, VCM = 300 mV, −50 mV < VID < +50 mV and RL = 100Ω.

Boldface limits apply at the temperature extremes. (Note 6)

Symbol Parameter Conditions Min

(Note 6)

I

B

Input Bias Current VIN Differential = 0 −5

−7

I

OS

TC I

V

OS

TC V

Input Offset Current VIN Differential = 0 −500 +500 nA

Input Offset Current TC VIN Differential = 0 ±2 nA/°C

OS

Input Offset Voltage −9.5 +9.5 mV

Input Offset Voltage TC ± 50

OS

VRI Input Voltage Range CMRR > 50 dB −0.2 VCC−2 V

CMRR Common-Mode Rejection Ratio VCM = 0 to VCC−2.2V 60 70 dB

PSRR Power Supply Rejection Ratio 63 74 dB

A

V

ΔV

V

ΔV

I

SC

I

S

V

O

OH

OL

OD

Open Loop Gain 59 dB

Output Offset Voltage VIN Differential = 50 mV 1125 1225 1325 mV

VO Change Between ‘0’ and ‘1’ VIN Differential = ±50 mV −25 +25 mV

Output Voltage High VIN Differential = 50 mV 1390 1475 mV

Output Voltage Low VIN Differential = 50 mV 925 1060 mV

Output Voltage Differential VIN Differential = 50 mV 250 330 400 mV

VOD Change between ‘0’ to ‘1’ VIN Differential = ±50 mV −25 +25 mV

Short Circuit Current Output to GND Pin (Note 4)

Output Shorted Together (Note 4) OUT Q to OUT Q

Supply Current Load Current Excluded

OUT Q to GND Pin VIN Differential = 50 mV

OUT Q to GND Pin V

Differential = 50 mV

IN

V

Differential = 50 mV

IN

V

Differential = 50 mV

IN

5

7.5 10.0

Typ

(Note 5)

(Note 6)

−2.1 −0.5

Max

14.0

Units

µA

μV/°C

mA

+12V AC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C, VCM = 300 mV, −50 mV < VID < +50 mV and RL = 100Ω. Boldface limits apply at the temperature extremes. (Note 6)

Symbol Parameter Conditions Min

TR Toggle Rate Overdrive = ±50 mV; CL = 2 pF @

50% Output Swing

t

jitter_RMS

RMS-Random Jitter Overdrive = 100 mV; CL = 2 pF

Center Frequency = 70 MHz Bandwidth = 10 Hz – 20 MHz

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(Note 6)

860 1080 Mb/s

4.29 ps

Typ

(Note 5)

Max

(Note 6)

Units

LMH7220

Symbol Parameter Conditions Min

(Note 6)

t

PDLH

Propagation Delay t

= (t

+ t

PDLH

PDH

PDL

) / 2 (see figure 3 application note) Input SR = Constant VID start value = −100 mV

Overdrive 20 mV 3.56

Overdrive 50 mV 2.98

Overdrive 100 mV 2.7 7

Overdrive 1V 2.24

tOD-disp Input Overdrive Dispersion @Overdrive 20 - 100 mV 0.86

@Overdrive 100 mV - 1V 0.46

tSR-disp Input Slew Rate Dispersion 0.05 V/ns to 1 V/ns

0.24 ns

Typ

(Note 5)

Max

(Note 6)

Units

ns

Overdrive 100 mV

tCM-disp Input Common Mode dispersion SR = 4 V/ns; Overdrive 100 mV

0.55 ns

VCM = 0 to 10V

Δt

t

r

f

PDLH

PDHL

Q to Q Time Skew | t

- t

PDH

| (Note 8)

PDL

Q to Q Time Skew | t

- t

PDL

| (Note 8)

PDH

Output Rise Time (20% - 80%) (Note9)Overdrive = 100 mV; CL = 2 pF 0.56 ns

Output Fall Time (20% - 80%) (Note9)Overdrive = 100 mV; CL = 2 pF 0.49 ns

Overdrive = 100 mV; CL = 2 pF 0 ns

Overdrive = 100 mV; CL = 2 pF 0.06 ns

+5V DC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C, VCM = 300 mV, −50 mV < VID < +50 mV and RL = 100Ω. Boldface limits apply at the temperature extremes. (Note 6)

Symbol Parameter Conditions Min

(Note 6)

I

B

Input Bias Current VIN Differential = 0 −5

−7

I

OS

TC I

V

OS

TC V

Input Offset Current VIN Differential = 0 −500 +500 nA

Input Offset Current TC VIN Differential = 0 ± 2 nA/°C

OS

Input Offset Voltage −9.5 +9.5 mV

Input Offset Voltage TC ± 50

OS

VRI Input Voltage Range CMRR > 50 dB −0.2 VCC−2 V

CMRR Common-Mode Rejection Ratio VCM = 0 to VCC−2.2V 60 70 dB

PSRR Power Supply Rejection Ratio 63 74 dB

A

V

ΔV

V

ΔV

I

SC

I

S

V

O

OH

OL

OD

Open Loop Gain 59 dB

Output Offset Voltage VIN Differential = 50 mV 1125 1217 1325 mV

VO Change Between ‘0’ and ‘1’ VIN Differential = ±50 mV −25 +25 mV

Output Voltage High VIN Differential = 50 mV 1380 1475 mV

Output Voltage Low VIN Differential = 50 mV 925 1060 mV

Output Voltage Differential VIN Differential = 50 mV 250 320 400 mV

VOD Change between ‘0’ to ‘1’ VIN Differential = ±50 mV −25 +25 mV

Short Circuit Current Output to GND Pin (Note 4)

Output Shorted Together (Note 4) OUT Q to OUT Q

Supply Current Load Current Excluded

OUT Q to GND Pin VIN Differential = 50 mV

OUT Q to GND Pin V

Differential = 50 mV

IN

V

Differential = 50 mV

IN

V

Differential = 50 mV

IN

5

6.8 9

Typ

(Note 5)

(Note 6)

−1.5 −0.5

Max

12.6

Units

µA

μV/°C

mA

3 www.national.com

+5V AC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C, VCM = 300 mV, −50 mV < VID < +50 mV and RL = 100Ω. Bold-

LMH7220

face limits apply at the temperature extremes. (Note 6)

Symbol Parameter Conditions Min

(Note 6)

TR Toggle Rate Overdrive = ±50 mV; CL = 2 pF @

750 940 Mb/s

50% Output Swing

t

jitter_RMS

RMS-Random Jitter Overdrive = 100 mV; CL = 2 pF

4.44 ps Center Frequency = 70 MHz Bandwidth = 10 Hz – 20 MHz

t

PDLH

Propagation Delay t

= (t

+ t

PDLH

PDH

PDL

) / 2 (see figure 3 application note) Input SR = Constant VID start value = -100mV

Overdrive 20 mV 3.63

Overdrive 50 mV 3.09

Overdrive 100 mV 2.9 7

Overdrive 1V 2.41

tOD-disp Input Overdrive Dispersion @Overdrive 20 - 100 mV 0.79

@Overdrive 100 mV - 1V 0.43

tSR-disp Input Slew Rate Dispersion 0.05 V/ns to 1 V/ns

0.20 ns

Overdrive 100 mV

tCM-disp Input Common Mode Dispersion SR = 4 V/ns; Overdrive 100 mV

0.21 ns

VCM = 0 to 3V

Δt

t

r

PDLH

PDHL

Q to Q Time Skew | t

- t

PDH

| (Note 8)

PDL

Q to Q Time Skew | t

- t

PDL

| (Note 8)

PDH

Output Rise Time (20% - 80%) (Note9)Overdrive = 100 mV; CL = 2 pF 0.59 ns

Overdrive = 100 mV; CL = 2 pF 0.09 ns

Overdrive = 100 mV; CL = 2 pF 0.07 ns

Typ

(Note 5)

Max

(Note 6)

Units

ns

t

f

Output Fall Time (20% - 80%) (Note9)Overdrive = 100 mV; CL = 2 pF 0.55 ns

+2.7V DC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C, VCM = 300 mV, −50 mV < VID < +50 mV and RL = 100Ω. Boldface limits apply at the temperature extremes. (Note 6)

Symbol Parameter Conditions Min

(Note 6)

I

B

Input Bias Current VIN Differential = 0 −5

−7

I

OS

TC I

V

OS

TC V

Input Offset Current VIN Differential = 0 −500 +500 nA

Input Offset Current TC VIN Differential = 0 ±2 nA/°C

OS

Input Offset Voltage −9.5 +9.5 mV

Input Offset Voltage TC ± 50

OS

VRI Input Voltage Range CMRR > 50 dB −0.2 VCC−2 V

CMRR Common-Mode Rejection Ratio VCM = 0 to VCC−2.2V 56 70 dB

PSRR Power Supply Rejection Ratio 63 74 dB

A

V

ΔV

V

O

OH

Open Loop Gain 59 dB

Output Offset Voltage VIN Differential = 50 mV 1125 1213 1325 mV

VO Change Between ‘0’ and ‘1’ VIN Differential = ± 50 mV −25 +25 mV

Output Voltage High

VIN Differential = 50 mV 1370 1475 mV

Average of ‘0’ to ‘1’

V

OL

Output Voltage Low

VIN Differential = 50 mV 925 1060 mV

Average of ‘0’ to ‘1’

V

OD

Output Voltage Differential VIN Differential = 50 mV 250 315 400 mV

Typ

(Note 5)

(Note 6)

−1.3 −0.5

Max

Units

µA

μV/°C

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LMH7220

Symbol Parameter Conditions Min

(Note 6)

ΔV

I

SC

OD

VOD Change between ‘0’ to ‘1’ VIN Differential = ±50 mV −25 +25 mV

Short Circuit Current Output to GND Pin (Note 4)

OUT Q to GND Pin VIN Differential = 50 mV

OUT Q to GND Pin V

Differential = 50 mV

IN

Output Shorted Together (Note 4) OUT Q to OUT Q

V

Differential = 50 mV

IN

I

S

Supply Current Load Current Excluded

V

Differential = 50 mV

IN

5

6.6 9

Typ

(Note 5)

Max

(Note 6)

12.6

+2.7V AC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C, VCM = 300 mV, −50 mV < VID < +50 mV and RL = 100Ω. Boldface limits apply at the temperature extremes. (Note 6)

Symbol Parameter Conditions Min

(Note 6)

TR Toggle Rate Overdrive = ±50 mV; CL = 2 pF @

700 880 Mb/s

50% Output Swing

t

jitter_RMS

RMS-Random Jitter Overdrive = 100 mV; CL = 2 pF

4.82 ps Center Frequency = 70 MHz Bandwidth = 10 Hz – 20 MHz

t

PDLH

Propagation Delay t

= (t

+ t

PDLH

PDH

PDL

) / 2 (see figure 3 application note) Input SR = Constant VID start value = -100mV

Overdrive 20 mV 3.80

Overdrive 50 mV 3.29

Overdrive 100 mV 3.0 7

Overdrive 1V 2.60

tOD-disp Input Overdrive Dispersion @Overdrive 20 - 100 mV 0.83

@Overdrive 100 mV - 1V 0.37

tSR-disp Input Slew Rate Dispersion 0.05 V/ns to 1 V/ns

0.23 ns

Overdrive 100 mV

tCM-disp Input Common Mode dispersion SR = 4 V/ns; Overdrive 100 mV

0.16 ns

VCM = 0 to 1.5V

Δt

PDLH

ΔtPDHL

t

r

Q to Q Time Skew | t

- t

PDH

| (Note 8)

PDL

Q to Q Time Skew | t

- t

PDL

| (Note 8)

PDH

Output Rise Time (20% - 80%) (Note9)Overdrive = 100 mV; CL = 2 pF 0.64 ns

Overdrive = 100 mV; CL = 2 pF 0.09 ns

Typ

(Note 5)

Max

(Note 6)

Units

mA

Units

ns

t

f

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Conditions indicate specifications for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC)

Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC)

Note 3: The maximum power dissipation is a function of T PD = (T

Note 4: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature of 150°C.

Note 5: Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material.

Note 6: All limits are guaranteed by testing or statistical analysis.

Note 7: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating

of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self heating where TJ > TA. See applications section for information on temperature de-rating of this device.

Output Fall Time (20% - 80%) (Note9)Overdrive = 100 mV; CL = 2 pF 0.59 ns

, θJA. The maximum allowable power dissipation at any ambient temperature is

– TA)/ θJA. All numbers apply for packages soldered directly onto a PC Board.

J(MAX)

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Note 8: Propagation Delay Skew, ΔtPD, is defined as the average of Δt

Note 9: The rise or fall time is the average of the Q and Q rise or fall time.

LMH7220

Schematic Diagram

Connection Diagram

PDLH

and Δt

PDHL

.

6-Pin TSOT/SC-70

20137601

Ordering Information

Package Part Number

Temperature Range (TA)

−40°C to +85°C

6-Pin TSOT

6-Pin SC-70

LMH7220MK

LMH7220MKX 3k Units Tape and Reel

LMH7220MG

LMH7220MGX 3k Units Tape and Reel

Top View

20137637

Package Marking Transport Media NSC Drawing

C29A

C38

1k Units Tape and Reel

MK06A

MA006A

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