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NATIONAL SEMICONDUCTOR LMH7220 User Guide

Summary

The LMH7220 is a high-speed, low-power differential comparator featuring an LVDS output, ideal for signal conditioning in demanding applications. Operating across 2.7V to 12V, it provides ultra-fast performance and ground sensing capabilities within compact TSOT/SC-70 packages. This technical manual covers detailed electrical specifications, timing parameters (e.g., propagation delay), reliability ratings, and various triggering functions for engineers designing signal processing systems.

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ig ra to r w ith tp

May 29, 2008

LMH7220 High Speed Comparator with LVDS Output General Description Features The LMH7220 is a high speed, low power comparator with an (VS = 5V TA = 25°C, Typical values unless otherwise speci- operating supply voltage range of 2.7V to 12V. The LMH7220 fied) has a differential, LVDS output, driving 325 m V into a 100Ω Propagation delay @ 100 m V overdrive 2.9 ns symmetrical transmission line. The LMH7220 has a 2.9 ns

Rise and fall times 0.6 ns

propagation delay and 0.6 ns rise and fall times while the

Supply voltage 2.7V to 12V

supply current is only 6.8 m A at 5V (load current excluded).

Supply current 6.8 m A

The LMH7220 inputs have a voltage range that extends 200

Temperature range −40°C to 125°C

m V below ground, allowing ground sensing applications. The

LVDS output

LMH7220 is available in both the 6-Pin TSOT and SC-70 packages. These packages are ideal where space is a critical

Applications

item.

Acquisition trigger Fast differential line receiver Pulse height analyzer Peak detector Pulse width modulator Remote threshold detection Oscilloscope triggering

Typical Schematic

© 2008 National Semiconductor Corporation www.national.com

Page Summary Contents For NATIONAL SEMICONDUCTOR LMH7220 User Guide

Page 1 ig ra to r w ith tp May 29, 2008 LMH7220 High Speed Comparator with LVDS Output General Description Features The LMH7220 is a high speed, low power comparator with an (VS = 5V TA = 25°C, Typical value...
Page 2 Storage Temperature Range −65°C to +150°C Absolute Maximum Ratings (Note 1) Voltage on any I/O Pin GND−0.2V to VCC+0.2V If Military/Aerospace specified devices are required, Junction Temperature (Note...
Page 3 Symbol Parameter Conditions Min Typ Max Units (Note 6) (Note 5) (Note 6) t PDLH Propagation Delay Overdrive 20 m V 3.56 t PDLH = (t PDH + t PDL ) / 2 Overdrive 50 m V 2.98 (see figure 3 application no...
Page 4 +5V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25°C, VCM = 300 m V, −50 m V < VID < +50 m V and RL = 100Ω. Bold- face limits apply at the temperatur...
Page 5 Symbol Parameter Conditions Min Typ Max Units (Note 6) (Note 5) (Note 6) ΔVOD VOD Change between ‘0’ to ‘1’ VIN Differential = ±50 m V −25 +25 m V ISC Short Circuit Current Output to GND OUT Q to GND ...
Page 6 Note 8: Propagation Delay Skew, Δt PD, is defined as the average of Δt PDLH and Δt PDHL. Note 9: The rise or fall time is the average of the Q and Q rise or fall time. Schematic Diagram Connection Dia...
Page 7 Typical Performance Characteristics At TJ = 25°C; unless otherwise specified: VCM = 0.3V, VOVERDRIVE = 100 m V, RL = 100Ω. Input Current vs. Differential Input Voltage Bias Current vs. Supply Voltage ...
Page 8 Differential Output Voltage vs. Temperature Supply Current vs. Supply Voltage Supply Current vs. Temperature Rise & Fall Time vs. Temperature Propagation Delay vs. Temperature Propagation Delay vs...
Page 9 Propagation Delay vs. Common Mode Voltage Propagation Delay vs. Slew Rate Pulse Response Over Temperature www.national.com
Page 10 Application Information INTRODUCTION The LMH7220 is a high speed comparator with LVDS outputs. The LVDS (Low Voltage Differential Signaling) standard uses differential outputs with a voltage swing of ...
Page 11 DEFINITIONS voltage. In the table below is a list of abbreviations of the For a good understanding of many parameters of the measured parameters and a short description of the condi- LMH7220 it is nec...
Page 12 Symbol Text Description t PDHd resp t PDLd Delay time between the moment the input signal crosses the switching level L to H and the zero crossing of the rising edge of the differential output signal ...
Page 13 Both output circuits should be symmetrical. At the moment one output is switching ‘on’ the other is switching ‘off’ with ideally no skew between them. The design of the LMH7220 is optimized to minimiz...
Page 14 All of the dispersion effects discussed before influence the propagation delay. In practice the dispersion is often caused by a combination of more than one varied parameter. It is good to realize thi...
Page 15 Using Hysteresis to level B. So before the output has the possibility to toggle A good way to avoid oscillations and noise during slow slopes again, the difference between both inputs is made sufficie...
Page 16 absolute value of the difference between both voltages is comparator’s outputs. In the case of a balanced input con- called VOD. LVDS outputs cannot be held at the VO level be- nected to the load resi...
Page 17 Maximum Bitrates A very important specification in high speed circuits are the rise and fall times. In fact these determine the maximum tog- gle rate (TR) of the part. The LVDS standard specifies them...
Page 18 phenomena to create optimal connections to the receiving performance of the circuit. Practice dictates that a high fre- part or the terminating resistor, in accordance with their phys- quency design a...
Page 19 Physical Dimensions inches (millimeters) unless otherwise noted 6-Pin TSOT NS Package Number MK06A 6-Pin SC-70 NS Package Number MA006A www.national.com
Page 20 ig ra to it tp Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBEN...

Manual Details

Brand National
Pages 20
File Size 1.03 MB
Published June 18, 2026
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Frequently Asked Questions

What is the operating supply voltage range?

The LMH7220 operates with a range of 2.7V to 12V.

Do I need specific packages for limited space applications?

Yes, it is available in both the 6-Pin TSOT and SC-70 packages, ideal where space is critical.

What are the rise and fall times of the device?

The LMH7220 specifies a 2.9 ns Rise and fall times (typical values).

What is the maximum operating temperature range?

The industrial operating temperature range for the LMH7220 is −40°C to +125°C.

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