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

LMH6738

www.ti.com

SNOSAC1E –APRIL 2004–REVISED MARCH 2013

LMH6738 Very Wideband, Low Distortion Triple Op Amp

Check for Samples: LMH6738

FEATURES

DESCRIPTION

• 750 MHz −3 dB small signal bandwidth

The LMH6738 is a very wideband, DC coupled

= +1)

monolithic operational amplifier designed specifically

• −85 dBc 3rd 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 TI’s current feedback

• 3300 V/μs slew rate

architecture, the LMH6738 offers a gain range of ±1

• 33 mA supply current (11.3 mA per op amp)

to ±10 while providing stable, operation without

• 90 mA linear output current

external compensation, even at unity gain. At a gain

of +2 the LMH6738 supports ultra high resolution

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

= 150Ω)

video systems with a 400 MHz 2 V

–3 dB

Bandwidth. With 12-bit distortion levels through 30

APPLICATIONS

MHz (R

= 100Ω), 2.3 nV/Hz input referred noise, the

• RGB video driver

LMH6738 is the ideal driver or buffer for high speed

flash A/D and D/A converters. Wide dynamic range

• High resolution projectors

systems such as radar and communication receivers

• Flash A/D driver

requiring a wideband amplifier offering exceptional

• D/A transimpedance buffer

signal purity will find the LMH6738 low input referred

• Wide dynamic range IF amp noise and low harmonic distortion make it an

attractive solution.

• 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 (18 pages)

PAGE 1
LMH6738 www.ti.com SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 LMH6738 Very Wideband, Low Distortion Triple Op Amp Check for Samples: LMH6738 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 33 mA supply current (11.3 mA per op amp) 90 mA linear output current 0.02/0.01 Diff. Gain / Diff.
PAGE 2
LMH6738 SNOSAC1E – APRIL 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 (1) Supply Voltage (V+ - V–) 13.
PAGE 3
LMH6738 www.ti.com SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 Electrical Characteristics (1) AV = +2, VCC = ±5V, RL = 100Ω, RF = 549Ω; unless otherwise specified. Symbol Parameter Conditions Min Typ Max 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 LSBW MHz MHz 0.1 dB Bandwidth VOUT = 2 VPP 150 MHz GFPL Peaking DC to 75 MHz 0 dB GFR1 Rolloff DC to 150 MHz, VOUT = 2 VPP 0.
PAGE 4
LMH6738 SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 www.ti.com Electrical Characteristics (1) (continued) AV = +2, VCC = ±5V, RL = 100Ω, RF = 549Ω; unless otherwise specified. Symbol Parameter Conditions − Supply Current Disabled V Min RL = ∞ Typ Max Units 1.1 1.3 mA Miscellaneous Performance RIN+ Non-Inverting Input Resistance CIN+ Non-Inverting Input Capacitance RIN− Inverting Input Impedance Output impedance of input buffer.
PAGE 5
LMH6738 www.ti.com SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 Typical Performance Characteristics AV = +2, VCC = ±5V, RL = 100Ω, RF = 549Ω; unless otherwise specified).
PAGE 6
LMH6738 SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) AV = +2, VCC = ±5V, RL = 100Ω, RF = 549Ω; 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 VOUT = 1 VPP, CL || 1 k: -1.5 -10 0 4 8 12 16 20 1 10 100 1000 FREQUENCY (MHz) TIME (ns) Figure 7.
PAGE 7
LMH6738 www.ti.com SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 Typical Performance Characteristics (continued) AV = +2, VCC = ±5V, RL = 100Ω, RF = 549Ω; unless otherwise specified). Distortion vs. Supply Voltage CMRR vs. Frequency 50 -65 VOUT = 2VPP f = 10 MHz HD2 -70 45 35 CMRR (dB) DISTORTION (dBc) 40 -75 -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 Figure 13. Figure 14. PSRR vs. Frequency Crosstalk vs.
PAGE 8
LMH6738 SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) AV = +2, VCC = ±5V, RL = 100Ω, RF = 549Ω; unless otherwise specified). DC Errors vs. Temperature Input Noise vs. Frequency 1 6 1000 1000 0.6 2 0.4 0 VOS 0.2 -2 0 -4 -0.2 -6 -0.4 100 INVERTING CURRENT NO N CU RR EN T 10 10 -8 IBN -0.6 -40 -IN VER TIN G 100 CURRENT NOISE (pA/ Hz) 4 VOLTAGE NOISE (nV/ Hz) 0.
PAGE 9
LMH6738 www.ti.com SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 APPLICATION INFORMATION +5V 0.01 µF VIN RIN +5V 6.8 µF 6.8 µF AV = 1 +RF/RG = VOUT/VIN 0.01 µF CPOS VOUT 25: - + CSS 0.1 µF - CNEG 0.01 µF RG = VOUT VIN CPOS + CSS 0.1 µF RF AV = RF VIN RG RG -5V CNEG 0.01 µF RT 6.8 µF VOUT 6.8 µF -5V Figure 22. Recommended Non-Inverting Gain Circuit RF SELECT RT TO YIELD DESIRED RIN = RT||RG Figure 23.
PAGE 10
LMH6738 SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 www.ti.com 800 RECOMMENDED RF (:) 700 600 NON-INVERTING (AV > 0) 500 400 300 INVERTING (AV < 0) 200 100 0 1 2 3 4 5 6 7 8 9 10 |GAIN| (V/V) Figure 24. Recommended RF vs. Gain See Figure 24, Recommended RF. vs Gain for selecting a feedback resistor value for gains of ±1 to ±10. Since each application is slightly different it is worth some experimentation to find the optimal RF for a given circuit. In general a value of RF that produces ~.
PAGE 11
LMH6738 www.ti.com SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 When using the LMH6738 as a low pass filter the value of RF can be substantially reduced from the value recommended in the RF vs. Gain charts. The benefit of reducing RF is increased gain at higher frequencies, which improves attenuation in the stop band. Stability problems are avoided because in the stop band additional device bandwidth is used to cancel the input signal rather than amplify it.
PAGE 12
LMH6738 SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 www.ti.com High speed amplifiers are sensitive to capacitance between the inverting input and ground or power supplies. This shows up as gain peaking at high frequency. The capacitor raises device gain at high frequencies by making RG appear smaller. Capacitive output loading will exaggerate this effect. In general, avoid introducing unnecessary parasitic capacitance at both the inverting input and the output.
PAGE 13
LMH6738 www.ti.com SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 To ensure maximum output drive and highest performance, thermal shutdown is not provided. Therefore, it is of utmost importance to make sure that the TJMAX is never exceeded due to the overall power dissipation (all 3 channels).
PAGE 14
LMH6738 SNOSAC1E – APRIL 2004 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision D (March 2013) to Revision E • 14 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 15
PACKAGE OPTION ADDENDUM www.ti.
PAGE 16
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.
PAGE 17
PAGE 18
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.