LMH6714MA/NOPB - NATIONAL SEMICONDUCTOR

LMH6714,LMH6720,LMH6722

LMH6714/ LMH6720/ LMH6722/ LMH6722Q Wideband Video Op Amp; Single, Single

with Shutdown and Quad

Literature Number: SNOSA39F

LMH6714/ LMH6720/

LMH6722/ LMH6722Q

October 20, 2009

Wideband Video Op Amp; Single, Single with Shutdown

and Quad

General Description

The LMH6714/LMH6720/LMH6722 series combine

National's VIP10™ high speed complementary bipolar pro-

cess with National's current feedback topology to produce a

very high speed op amp. These amplifiers provide a 400MHz

small signal bandwidth at a gain of +2V/V and a 1800V/μs

slew rate while consuming only 5.6mA from ±5V supplies.

The LMH6714/LMH6720/LMH6722 series offer exceptional

video performance with its 0.01% and 0.01° differential gain

and phase errors for NTSC and PAL video signals while driv-

ing a back terminated 75Ω load. They also offer a flat gain

response of 0.1dB to 120MHz. Additionally, they can deliver

70mA continuous output current. This level of performance

makes them an ideal op amp for broadcast quality video sys-

tems.

The LMH6714/LMH6720/LMH6722's small packages (SOIC,

SOT23 and LLP), low power requirement, low noise and dis-

tortion allow the LMH6714/LMH6720/LMH6722 to serve

portable RF applications. The high impedance state during

shutdown makes the LMH6720 suitable for use in multiplex-

ing multiple high speed signals onto a shared transmission

line. The LMH6720 is also ideal for portable applications

where current draw can be reduced with the shutdown func-

tion.

Features

■400MHz (AV = +2V/V, VOUT = 500mVPP) −3dB BW

■250MHz (AV = +2V/V, VOUT = 2VPP) -3dB BW

■0.1dB gain flatness to 120MHz

■Low power: 5.6mA

■TTL compatible shutdown pin (LMH6720)

■Very low diff. gain, phase: 0.01%, 0.01° (LMH6714)

■−58 HD2/ −70 HD3 at 20MHz

■Fast slew rate: 1800V/μs

■Low shutdown current: 500uA (LMH6720)

■11ns turn on time (LMH6720)

■7ns shutdown time (LMH6720)

■Unity gain stable

■Improved replacement for CLC400,401,402,404,406 and

446 (LMH6714)

■Improved replacement for CLC405 (LMH6720)

■Improved replacement for CLC415 (LMH6722)

■LMH6722QSD is AEC-Q100 grade 1 qualified and is

manufactured on an automotive grade flow

Applications

■HDTV, NTSC & PAL video systems

■Video switching and distribution

■Wideband active filters

■Cable drivers

■High speed multiplexer (LMH6720)

■Programmable gain amplifier (LMH6720)

■Automotive (LMH6722)

Typical Performance

Non-Inverting Small Signal Frequency Response

20056506

Differential Gain and Phase vs. Number of Video Loads

(LMH6714)

20056528

VIP10™ is a trademark of National Semiconductor Corporation.

LMH6714/ LMH6720/ LMH6722/ LMH6722Q Wideband Video Op Amp;

Single, Single with Shutdown and Quad

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

ESD Tolerance (Note 4)

Human Body Model 2000V

Machine Model 200V

VCC ±6.75V

IOUT (Note 3)

Common Mode Input Voltage ±VCC

Differential Input Voltage 2.2V

Maximum Junction Temperature +150°C

Storage Temperature Range −65°C to +150°C

Lead Temperature (soldering 10 sec) +300°C

Storage Temperature Range −65°C to +150°C

Shutdown Pin Voltage (Note 5) +VCC to VCC/2-1V

Operating Ratings (Note 1)

Thermal Resistance

Package (θJA)

5-Pin SOT23 232°C/W

6-Pin SOT23 198°C/W

8-Pin SOIC 145°C/W

14-Pin SOIC 130°C/W

14-Pin TSSOP 160°C/W

14-Pin LLP 46°C/W

Operating Temperature −40°C to 85°C

Operating Temperature LLP −40°C to 125°C

Supply Voltage Range 8V (±4V) to 12.5V (±6.25V)

Electrical Characteristics

Unless specified, AV = +2, RF = 300Ω: VCC = ±5V, RL = 100Ω, LMH6714/LMH6720/LMH6722. Boldface limits apply at temperature

extremes.

Symbol Parameter Conditions Min

(Note 7)

Typ

(Note 6)

Max

(Note 7)

Units

Frequency Domain Response

SSBW −3dB Bandwidth VOUT = 0.5VPP 345 400 MHz

LSBW −3dB Bandwidth VOUT = 2.0VPP 200 250 MHz

LSBW −3dB Bandwidth, LMH6722

TSSOP package only

VOUT = 2.0VPP 170 250 MHz

Gain Flatness VOUT = 2VPP

GFP Peaking DC to 120MHz 0.1 dB

GFR Rolloff DC to 120MHz 0.1 dB

LPD Linear Phase Deviation DC to 120MHz 0.5 deg

DG Differential Gain RL = 150Ω, 4.43MHz (LMH6714) 0.01 %

DG Differential Gain RL = 150Ω, 4.43MHz (LMH6720) 0.02 %

DP Differential Phase RL = 150Ω, 4.43MHz 0.01 deg

Time Domain Response

TRS Rise and Fall Time .5V Step 1.5 ns

TRL 2V Step 2.6 ns

tsSettling Time to 0.05% 2V Step 12 ns

SR Slew Rate 6V Step 1200 1800 V/µs

Distortion and Noise Response

HD2 2nd Harmonic Distortion 2VPP, 20MHz −58 dBc

HD3 3rd Harmonic Distortion 2VPP, 20MHz −70 dBc

IMD 3rd Order Intermodulation

Products

10MHz, POUT = 0dBm −78 dBc

Equivalent Input Noise

VN Non-Inverting Voltage >1MHz 3.4 nV/

NICN Inverting Current >1MHz 10 pA/

ICN Non-Inverting Current >1MHz 1.2 pA/

Static, DC Performance

VIO Input Offset Voltage ±0.2 ±6

±8

DVIO Average Drift 8 μV/°C

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LMH6714/ LMH6720/ LMH6722/ LMH6722Q

Symbol Parameter Conditions Min

(Note 7)

Typ

(Note 6)

Max

(Note 7)

Units

IBN Input Bias Current Non-Inverting ±1 ±10

±15

µA

DIBN Average Drift 4 nA/°C

IBI Input Bias Current Inverting −4 ±12

±20

µA

DIBI Average Drift 41 nA/°C

PSRR Power Supply Rejection Ratio DC 48

58 dB

CMRR Common Mode Rejection

Ratio

DC 48

54 dB

ICC Supply Current RL = ∞LMH6714

LMH6720

4.5

5.6 7.5

8mA

LMH6722 18

22.5 30

ICCI Supply Current During

Shutdown

LMH6720 500 670 μA

Miscellaneous Performance

RIN Input Resistance Non-Inverting 2 MΩ

CIN Input Capacitance Non-Inverting 1.0 pF

ROUT Output Resistance Closed Loop 0.06 Ω

VOUT Output Voltage Range RL = ∞ ±3.5

±3.4

±3.9

RL = 100Ω ±3.6

±3.4

±3.8

CMIR Input Voltage Range Common Mode ±2.2 V

IOUT Output Current (Note 3) VIN = 0V, Max Linear

Current

50 70 mA

OFFMA

Voltage for Shutdown LMH6720 0.8 V

ONMIN Voltage for Turn On LMH6720 2.0 V

IIH Current Turn On LMH6720, SD = 2.0V −20

−30

2 20

μA

IIL Current Shutdown LMH6720, SD = .8V −600 −400 −100 μA

IOZ ROUT Shutdown LMH6720, SD = .8V 0.2 1.8 MΩ

ton Turn on Time LMH6720 11 ns

toff Turn off Time LMH6720 7 ns

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

intended to be functional, but specific performance is not guaranteed. For guaranteed specifications, see the Electrical Characteristics tables.

Note 2: 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 derating of this device." Min/Max ratings are based on product characterization and simulation.

Individual parameters are tested as noted.

Note 3: The maximum output current (IOUT) is determined by device power dissipation limitations. See the Power Dissipation section of the Application Division

for more details.

Note 4: 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 5: The shutdown pin is designed to work between 0 and VCC with split supplies (VCC = -VEE). With single supplies (VEE = ground) the shutdown pin should

not be taken below VCC/2.

Note 6: Typical values represent the most likely parametric norm 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 7: All limits are guaranteed by testing, design, or statistical analysis.

3 www.national.com

LMH6714/ LMH6720/ LMH6722/ LMH6722Q

Connection Diagrams

5-Pin SOT23 (LMH6714)

20056531

Top View

6-Pin SOT23 (LMH6720)

20056532

Top View

14-Pin SOIC, TSSOP and LLP (LMH6722)

20056534

Top View

8-Pin SOIC (LMH6714)

20056539

Top View

8-Pin SOIC (LMH6720)

20056538

Top View

Ordering Information

Package Part Number Package Marking Transport Media NSC Drawing Features

5-Pin SOT23 LMH6714MF A95A 1k Units Tape and Reel MF05A

LMH6714MFX 3k Units Tape and Reel

8-Pin SOIC LMH6714MA LMH6714MA 95 Units / Rail M08A

LMH6714MAX 2.5k Units Tape and Reel

6-Pin SOT23 LMH6720MF A96A 1k Units Tape and Reel MF06A

LMH6720MFX 3k Units Tape and Reel

8-Pin SOIC LMH6720MA LMH6720MA 95 Units / Rail M08A

LMH6720MAX 2.5k Units Tape and Reel

14-Pin SOIC LMH6722MA LMH6722MA 55 Units / Rail M14A

LMH6722MAX 2.5k Units Tape and Reel

14–Pin

TSSOP

LMH6722MT LMH6722MT 94 Units / Rail MTC14

LMH6722MTX 2.5k Units Tape and Reel

14-Pin LLP

LMH6722SD L6722 1k Units Tape and Reel

SDA14A

AEC-Q100 Grade 1

qualified.

Automotive Grade

Production Flow**

LMH6722SDX 4.5k Units Tape and Reel

LMH6722QSD L6722Q 1k Units Tape and Reel

LMH6722QSDX 4.5k Units Tape and Reel

**Automotive Grade (Q) product incorporates enhanced manufacturing and support processes for the automotive market, including defect detection

methodologies. Reliability qualification is compliant with the requirements and temperature grades defined in the AEC-Q100 standard. Automotive grade products

are identified with the letter Q. For more information go to http://www.national.com/automotive.

www.national.com 4

LMH6714/ LMH6720/ LMH6722/ LMH6722Q

Typical Performance Characteristics (V+ = +5V, V− = −5V, AV = 2, RF = 300Ω, RL = 100Ω Unless

Specified).

Non-Inverting Small Signal Frequency Response

20056506

Non-Inverting Large Signal Frequency Response

20056507

Inverting Frequency Response

20056503

Non-Inverting Frequency Response vs. VO

20056508

Inverting Frequency Response vs. VO

20056509

Harmonic Distortion vs. Frequency

20056504

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LMH6714/ LMH6720/ LMH6722/ LMH6722Q

2nd Harmonic Distortion vs. VOUT

20056502

3rd Harmonic Distortion vs. VOUT

20056501

DG/DP (LMH6714)

20056528

DG/DP (LMH6720)

20056505

DG/DP (LMH6722)

20056535

Large Signal Pulse Response

20056513

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LMH6714/ LMH6720/ LMH6722/ LMH6722Q

Small Signal Pulse Response

20056510

Closed Loop Output Resistance

20056511

Open Loop Transimpedance Z(s)

20056523

PSRR vs. Frequency

20056516

CMRR vs. Frequency

20056525

Frequency Response vs. RF

20056512

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LMH6714/ LMH6720/ LMH6722/ LMH6722Q

DC Errors vs. Temperature

20056518

Maximum VOUT vs. Frequency

20056526

3rd Order Intermodulation vs. Output Power

20056527

Crosstalk vs. Frequency (LMH6722)

for each channel with all others active

20056536

Noise vs. Frequency

20056540

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LMH6714/ LMH6720/ LMH6722/ LMH6722Q

Application Section

FEEDBACK RESISTOR SELECTION

One of the key benefits of a current feedback operational am-

plifier is the ability to maintain optimum frequency response

independent of gain by using appropriate values for the feed-

back resistor (RF). The Electrical Characteristics and Typical

Performance plots specify an RF of 300Ω, a gain of +2V/V and

±5V power supplies (unless otherwise specified). Generally,

lowering RF from it's recommended value will peak the fre-

quency response and extend the bandwidth while increasing

the value of RF will cause the frequency response to roll off

faster. Reducing the value of RF too far below it's recom-

mended value will cause overshoot, ringing and, eventually,

oscillation.

20056512

FIGURE 1. Frequency Response vs. RF

The plot labeled "Frequency Response vs. RF" shows the

LMH6714/LMH6720/LMH6722's frequency response as RF is

varied (RL = 100Ω, AV = +2). This plot shows that an RF of

147Ω results in peaking. An RF of 300Ω gives near maximal

bandwidth and gain flatness with good stability. An RF of

400Ω gives excellent stability with only a small bandwidth

penalty. Since all applications are slightly different it is worth

some experimentation to find the optimal RF for a given circuit.

Note that it is not possible to use a current feedback amplifier

with the output shorted directly to the inverting input. The

buffer configuration of the LMH6714/LMH6720/LMH6722 re-

quires a 600Ω feedback resistor for stable operation.

For more information see Application Note OA-13 which de-

scribes the relationship between RF and closed-loop frequen-

cy response for current feedback operational amplifiers. The

value for the inverting input impedance for the LMH6714/

LMH6720/LMH6722 is approximately 180Ω. The LMH6714/

LMH6720/LMH6722 is designed for optimum performance at

gains of +1 to +6 V/V and −1 to −5V/V. When using gains of

±7V/V or more the low values of RG required will make in-

verting input impedances very low.

When configuring the LMH6714/LMH6720/LMH6722 for

gains other than +2V/V, it is usually necessary to adjust the

value of the feedback resistor. The two plots labeled “RF vs.

Non-inverting Gain” and “RF vs. Inverting Gain” provide rec-

ommended feedback resistor values for a number of gain

selections.

20056515

FIGURE 2. RF vs. Non-Inverting Gain

In the “RF vs. Non-Inverting Gain” and the “RF vs. Inverting

Gain” charts the recommended value of RF is depicted by the

solid line, which starts high, decreases to 200Ω and begins

increasing again. The reason that a higher RF is required at

higher gains is the need to keep RG from decreasing too far

below the output impedance of the input buffer. For the

LMH6714/LMH6720/LMH6722 the output resistance of the

input buffer is approximately 180Ω and 50Ω is a practical low-

er limit for RG. Due to the limitations on RG the LMH6714/

LMH6720/LMH6722 begins to operate in a gain bandwidth

limited fashion for gains of ±5V/V or greater.

20056514

FIGURE 3. RF vs. Inverting Gain

ACTIVE FILTERS

When using any current feedback Operational Amplifier as an

active filter it is important to be very careful when using reac-

tive components in the feedback loop. Anything that reduces

the impedance of the negative feedback, especially at higher

frequencies, will almost certainly cause stability problems.

Likewise capacitance on the inverting input needs to be avoid-

ed. See Application Notes OA-7 and OA-26 for more infor-

mation on Active Filter applications for Current Feedback Op

Amps.

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LMH6714/ LMH6720/ LMH6722/ LMH6722Q

20056521

FIGURE 4. Enable/Disable Operation

ENABLE/DISABLE OPERATION USING ±5V SUPPLIES

(LMH6720 ONLY)

The LMH6720 has a TTL logic compatible disable function.

Apply a logic low (<.8V) to the DS pin and the LMH6720 is

disabled. Apply a logic high (>2.0V), or let the pin float and

the LMH6720 is enabled. Voltage, not current, at the Disable

pin determines the enable/disable state. Care must be exer-

cised to prevent the disable pin voltage from going more than .

8V below the midpoint of the supply voltages (0V with split

supplies, VCC/2 with single supplies) doing so could cause

transistor Q1 to Zener resulting in damage to the disable cir-

cuit. The core amplifier is unaffected by this, but disable

operation could become slower as a result.

Disabled, the LMH6720 inputs and output become high

impedances. While disabled the LMH6720 quiescent current

is approximately 500μA. Because of the pull up resistor on the

disable circuit the ICC and IEE currents are not balanced in the

disabled state. The positive supply current (ICC) is approxi-

mately 500μA while the negative supply current (IEE) is only

200μA. The remaining IEE current of 300μA flows through the

disable pin.

The disable function can be used to create analog switches

or multiplexers. Implement a single analog switch with one

LMH6720 positioned between an input and output. Create an

analog multiplexer with several LMH6720's. The LMH6720 is

at it's best at a gain of 1 for multiplexer applications because

there is no RG to shunt signals to ground.

DISABLE LIMITATIONS (LMH6720 ONLY)

The feedback Resistor (RF) limits off isolation in inverting gain

configurations. During shutdown the impedance of the

LMH6720 inputs and output become very high (>1MΩ), how-

ever RF and RG are the dominant factor for effective output

impedance.

Do not apply voltages greater than +VCC or less than 0V

(VCC/2 single supply) to the disable pin. The input ESD diodes

will also conduct if the signal leakage through the feedback

resistors brings the inverting input near either supply rail.

20056524

FIGURE 5. Typical Application with Suggested Supply

Bypassing

LAYOUT CONSIDERATIONS

Whenever questions about layout arise, use the evaluation

board as a guide. The following Evaluation boards are avail-

able with sample parts:

LMH6714 SOT CLC730216

SOIC CLC730227

LMH6720 SOT CLC730216

SOIC CLC730227

LMH6722 SOIC CLC730231

To reduce parasitic capacitances, the ground plane should be

removed near the input and output pins. To reduce series in-

ductance, trace lengths of components in the feedback loop

should be minimized. For long signal paths controlled

impedance lines should be used, along with impedance

matching at both ends.

Bypass capacitors should be placed as close to the device as

possible. Bypass capacitors from each rail to ground are ap-

plied in pairs. The larger electrolytic bypass capacitors can be

located anywhere on the board, the smaller ceramic capaci-

tors should be placed as close to the device as possible. In

addition Figure 2 shows a capacitor (C1) across the supplies

with no connection to ground. This capacitor is optional, how-

ever it is required for best 2nd Harmonic suppression. If this

capacitor is omitted C2 and C3 should be increased to .1μF

each.

VIDEO PERFORMANCE

The LMH6714/LMH6720/LMH6722 has been designed to

provide excellent performance with both PAL and NTSC com-

posite video signals. Performance degrades as the loading is

increased, therefore best performance will be obtained with

back terminated loads. The back termination reduces reflec-

tions from the transmission line and effectively masks capac-

itance from the amplifier output stage. While all parts offer

excellent video performance the LMH6714 and LMH6722 are

slightly better than the LMH6720.

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LMH6714/ LMH6720/ LMH6722/ LMH6722Q

WIDE BAND DIGITAL PROGRAMMABLE GAIN AMPLIFIER (LMH6720 ONLY)

20056519

FIGURE 6. Wideband Digitally Controlled Programmable Gain Amplifier

Channel Switching

20056520

FIGURE 7. PGA Output

As shown in Figure 6 and Figure 7 the LMH6720 can be used

to construct a digitally controlled programmable gain amplifi-

er. Each amplifier is configured to provide a digitally se-

lectable gain. To provide for accurate gain settings, 1% or

better tolerance is recommended on the feedback and gain

resistors. The gain provided by each digital code is arbitrary

through selection of the feedback and gain resistor values.

AMPLITUDE EQUALIZATION

Sending signals over coaxial cable greater than 50 meters in

length will attenuate high frequency signal components much

more than lower frequency components. An equalizer can be

made to pre emphasize the higher frequency components so

that the final signal has less distortion. This process can be

done at either end of the cable. The circuit in Figure 8 shows

a receiver with some additional components in the feedback

loop to equalize the incoming signal. The RC networks peak

the signal at higher frequencies. This peaking is a piecewise

linear approximation of the inverse of the frequency response

of the coaxial cable. Figure 9 shows the effect of this equal-

ization on a digital signal that has passed through 150 meters

of coaxial cable. Figure 10 shows a Bode plot of the frequency

response of the circuit in Figure 8 along with equations need-

ed to design the pole and zero frequencies. Figure 11 shows

a network analyzer plot of an LMH6714/LMH6720/LMH6722

with the following component values:

RG = 309Ω

R1 = 450Ω

C1 = 470pF

R2 = 91Ω

C2 = 68pF

11 www.national.com

LMH6714/ LMH6720/ LMH6722/ LMH6722Q

20056522

FIGURE 8. Equalizer Circuit Schematic

20056529

FIGURE 9. Digital Signal without and with Equalization

20056530

FIGURE 10. Design Equations

20056517

FIGURE 11. Equalizer Frequency Response

POWER DISSIPATION

Follow these steps to determine the Maximum power dissi-

pation for the LMH6714/LMH6720/LMH6722:

1. Calculate the quiescent (no load) power: PAMP = ICC

(VCC -VEE)

2. Calculate the RMS power at the output stage:

POUT (RMS) = ((VCC - VOUT (RMS)) * IOUT (RMS)), where

VOUT and IOUT are the voltage and current across the ex-

ternal load.

3. Calculate the total RMS power: PT = PAMP + POUT

The maximum power that the LMH6714/LMH6720/LMH6722,

package can dissipate at a given temperature can be derived

with the following equation:

PMAX = (150° - TA)/ θJA, where TA = Ambient temperature (°

C) and θJA = Thermal resistance, from junction to ambient, for

a given package (°C/W). For the SOIC package θJA is 148°C/

W, for the SOT it is 250°C/W.

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LMH6714/ LMH6720/ LMH6722/ LMH6722Q

Physical Dimensions inches (millimeters) unless otherwise noted

5-Pin SOT23

NS Product Number MF05A

6-Pin SOT23

NS Product Number MF06A

13 www.national.com

LMH6714/ LMH6720/ LMH6722/ LMH6722Q

8-Pin SOIC

NS Product Number M08A

14-Pin SOIC

NS Product Number M14A

www.national.com 14

LMH6714/ LMH6720/ LMH6722/ LMH6722Q

14-Pin TSSOP

NS Product Number MTC14

14-Pin LLP

NS Product Number SDA14A

15 www.national.com

LMH6714/ LMH6720/ LMH6722/ LMH6722Q

Notes

LMH6714/ LMH6720/ LMH6722/ LMH6722Q Wideband Video Op Amp;

Single, Single with Shutdown and Quad

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