Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Amplifier - Video buffering 750 MHz SSOP 16

-IN A

+IN A

-IN B

+IN B

DIS B

DIS C

-IN C

+IN C

-V

OUT C

OUT B

-V

OUT A

DIS A

LMH6739

www.ti.com

SNOSAD2G –MAY 2004–REVISED MARCH 2013

LMH6739 Very Wideband, Low Distortion Triple Video Buffer

Check for Samples: LMH6739

FEATURES

DESCRIPTION

• 750 MHz −3 dB small signal bandwidth

The LMH6739 is a very wideband, DC coupled

= +1)

monolithic selectable gain buffer designed specifically

• −85 dBc 3

harmonic distortion (20 MHz)

for ultra high resolution video systems as well as wide

• 2.3 nV/√Hz input noise voltage

dynamic range systems requiring exceptional signal

fidelity. Benefiting from current feedback architecture,

• 3300 V/μs slew rate

the LMH6739 offers gains of −1, 1 and 2. At a gain of

• 32 mA supply current (10.6 mA per op amp)

+2 the LMH6739 supports ultra high resolution video

• 90 mA linear output current

systems with a 400 MHz 2 V

3 dB Bandwidth. With

12-bit distortion level through 30 MHz (R

= 100Ω),

• 0.02/0.01 Diff. Gain/ Diff. Phase (R

= 150Ω)

2.3nV/√Hz input referred noise, the LMH6739 is the

• 2mA shutdown current

ideal driver or buffer for high speed flash A/D and D/A

converters. Wide dynamic range systems such as

APPLICATIONS

radar and communication receivers requiring a

wideband amplifier offering exceptional signal purity

• RGB video driver

will find the LMH6739 low input referred noise and

• High resolution projectors

low harmonic distortion make it an attractive solution.

• Flash A/D driver

The LMH6739 is offered in a space saving SSOP

• D/A transimpedance buffer package.

• Wide dynamic range IF amp

• Radar/communication receivers

• DDS post-amps

• Wideband inverting summer

• Line driver

CONNECTION DIAGRAM

16-Pin SSOP

Top View

See Package Number DBQ0016A

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (17 pages)

PAGE 1
LMH6739 www.ti.com SNOSAD2G – MAY 2004 – REVISED MARCH 2013 LMH6739 Very Wideband, Low Distortion Triple Video Buffer Check for Samples: LMH6739 FEATURES 1 • 2 • • • • • • • DESCRIPTION 750 MHz −3 dB small signal bandwidth (AV = +1) −85 dBc 3rd harmonic distortion (20 MHz) 2.3 nV/√Hz input noise voltage 3300 V/μs slew rate 32 mA supply current (10.6 mA per op amp) 90 mA linear output current 0.02/0.01 Diff. Gain/ Diff.
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LMH6739 SNOSAD2G – MAY 2004 – REVISED MARCH 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings ESD Tolerance (1) (2) Human Body Model 2000V Machine Model 200V + – Supply Voltage (V - V ) 13.
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LMH6739 www.ti.com SNOSAD2G – MAY 2004 – REVISED MARCH 2013 Electrical Characteristics (1) TA = 25°C, AV = +2, VCC = ±5V, RL = 100Ω; unless otherwise specified. Symbol Parameter Conditions Min (2) Typ (3) Max (2) Units Frequency Domain Performance UGBW −3 dB Bandwidth Unity Gain, VOUT = 200 mVPP 750 SSBW −3 dB Bandwidth VOUT = 200 mVPP 480 VOUT = 2 VPP 400 0.1 dB Bandwidth VOUT = 2 VPP 150 MHz Rolloff at 300 MHz, VOUT = 2 VPP 1.0 dB Rise and Fall Time (10% to 90%) 2V Step 0.
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LMH6739 SNOSAD2G – MAY 2004 – REVISED MARCH 2013 www.ti.com Electrical Characteristics (1) (continued) TA = 25°C, AV = +2, VCC = ±5V, RL = 100Ω; unless otherwise specified. Symbol Parameter Conditions Internal Feedback & Gain Set Resistor Value Min (2) Typ (3) Max (2) Units 375 450 525 Ω 0.2 ±1.1 % RL = ∞ Gain Error Miscellaneous Performance RIN+ Non-Inverting Input Resistance CIN+ Non-Inverting Input Capacitance RIN− Inverting Input Impedance Output impedance of input buffer.
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LMH6739 www.ti.com SNOSAD2G – MAY 2004 – REVISED MARCH 2013 Typical Performance Characteristics AV = +2, VCC = ±5V, RL = 100Ω; unless otherwise specified). Large Signal Frequency Response Small Signal Frequency Response 4 4 VOUT = 2 VPP AV = +1 2 AV = +1 NORMALIZED GAIN (dB) NORMALIZED GAIN (dB) 2 0 -2 -4 AV = -1 -6 0 -2 -4 AV = -1 -6 AV = +2 -8 -8 AV = +2 -10 -10 1 10 100 Figure 1. Figure 2. Frequency Response vs. VOUT Frequency Response vs.
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LMH6739 SNOSAD2G – MAY 2004 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) AV = +2, VCC = ±5V, RL = 100Ω; unless otherwise specified). Frequency Response vs. Capacitive Load Pulse Response 1.5 2 1 0 0.5 -2 CL = 4.7 pF, RS = 70: GAIN (dB) VOUT (V) CL = 15 pF, RS = 44: 0 CL = 47 pF, RS = 24: -4 CL = 100 pF, RS = 17: -0.5 -6 -1 -8 -1.5 -10 VOUT = 1 VPP, CL || 1 k: 0 4 8 12 16 20 1 10 100 1000 FREQUENCY (MHz) TIME (ns) Figure 7. Figure 8.
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LMH6739 www.ti.com SNOSAD2G – MAY 2004 – REVISED MARCH 2013 Typical Performance Characteristics (continued) AV = +2, VCC = ±5V, RL = 100Ω; unless otherwise specified). Distortion vs. Supply Voltage CMRR vs. Frequency 50 -65 VOUT = 2VPP f = 10 MHz HD2 -70 45 DISTORTION (dBc) 40 -75 CMRR (dB) 35 -80 HD3 -85 30 25 20 15 -90 10 -95 5 -100 0 6.8 7.6 8.4 9.2 0.01 10.8 11.6 12.4 10 10 1 0.1 100 1000 FREQUENCY (MHz) TOTAL SUPPLY VOLTAGE (V) Figure 13. Figure 14. PSRR vs.
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LMH6739 SNOSAD2G – MAY 2004 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) AV = +2, VCC = ±5V, RL = 100Ω; unless otherwise specified). Crosstalk vs. Frequency Disabled Channel Isolation vs. Frequency -30 -30 CH A & C VOUT = 2 VPP MEASURE CH B -40 CROSSTALK (dBc) CROSSTALK (dBc) -40 -50 -60 -70 -80 VS = ±5V -50 -60 -70 -80 -90 -100 -90 1 10 100 1000 0.1 1 10 100 1000 FREQUENCY (MHz) FREQUENCY (MHz) Figure 19. 8 VIN = 2 VPP Figure 20.
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LMH6739 www.ti.com SNOSAD2G – MAY 2004 – REVISED MARCH 2013 APPLICATION INFORMATION +5V +5V 6.8 µF 6.8 µF 0.01 µF VIN RIN 0.01 µF VIN CPOS CSS 0.1 µF + VOUT - RIN CPOS + CSS 0.1 µF VOUT - NC CNEG 0.01 µF CNEG 0.01 µF 6.8 µF 6.8 µF -5V -5V Figure 21. Recommended Non-Inverting Gain Circuit, Gain = +2 Figure 22. Recommended Non-Inverting Gain Circuit, Gain +1 +5V 6.8 µF 0.01 µF CPOS + CSS VOUT 0.1 µF - VIN CNEG RIN 0.01 µF 6.8 µF -5V Figure 23.
PAGE 10
LMH6739 SNOSAD2G – MAY 2004 – REVISED MARCH 2013 www.ti.com The gain of the LMH6739 is accurate to ±1% and stable over temperature. The internal gain setting resistors, RF and RG, match very well. However, over process and temperature their absolute value will change. Using external resistors in series with RG to change the gain will result in poor gain accuracy over temperature and from part to part. 4 RS 100: VIN CP 3.3 pF + 3 UNCOMPENSATED 2 VOUT 1 - 0 GAIN (dB) RIN 50: ROUT 50: -1 CP = 1.
PAGE 11
LMH6739 www.ti.com SNOSAD2G – MAY 2004 – REVISED MARCH 2013 DRIVING CAPACITIVE LOADS Capacitive output loading applications will benefit from the use of a series output resistor ROUT. Figure 28 shows the use of a series output resistor, ROUT, to stabilize the amplifier output under capacitive loading. Capacitive loads of 5 to 120 pF are the most critical, causing ringing, frequency response peaking and possible oscillation. The charts “Suggested ROUT vs.
PAGE 12
LMH6739 SNOSAD2G – MAY 2004 – REVISED MARCH 2013 www.ti.com POWER DISSIPATION The LMH6739 is optimized for maximum speed and performance in the small form factor of the standard SSOP16 package. To achieve its high level of performance, the LMH6739 consumes an appreciable amount of quiescent current which cannot be neglected when considering the total package power dissipation limit.
PAGE 13
LMH6739 www.ti.com SNOSAD2G – MAY 2004 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision F (March 2013) to Revision G • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 24-Oct-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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